Improving dental esthetics is a main objective of prosthodontic treatment. Recently, digital diag... more Improving dental esthetics is a main objective of prosthodontic treatment. Recently, digital diagnostic waxing has been proposed as an alternative to conventional diagnostic waxing; however, the impact on esthetics has not been evaluated. The purpose of this study was to evaluate the impact of diagnostic waxing on biometric esthetic variables and to compare the esthetic outcome achieved by digital waxing with conventional waxing. Three biometric variables were evaluated: perceived frontal proportion (PFP), width/height (W:H) ratio, and symmetry. Maxillary casts of 13 patients were collected. All of them had maxillary anterior teeth that required prosthodontic treatment. Two forms of diagnostic waxing were executed: conventional and digital waxing. Measurements of the esthetic variables were conducted digitally. For the PFP, a frontal image was made and the width of each tooth was measured. Subsequently, the PFP values of the lateral incisor to central incisor and of the canine to central incisor were calculated. In addition, the height and width of each tooth was measured to calculate the W:H ratio. Using the previous measurements, the symmetry between the right and left sides was determined. No consistent or recurrent PFP was detected for any cast. The diagnostic waxing did not alter the PFP of the pretreatment casts. The diagnostic waxing had restored the W:H ratio to what is assumed to be a natural ratio. An improvement in symmetry was detected after the diagnostic waxing and was more prominent after the digital waxing. However, no significant difference was found between the 2 diagnostic waxing methods. The 2 diagnostic waxing methods influenced the esthetic variables of the anterior maxillary teeth and yielded similar outcomes. Digital waxing appears to be a reasonable alternative, but further investigations are needed to ensure its practicality.
The International journal of oral & maxillofacial implants
To assess the influence of misfit of implant titanium and zirconia frameworks on peri-implant str... more To assess the influence of misfit of implant titanium and zirconia frameworks on peri-implant strains. Two Branemark implants were inserted in the areas of the mandibular left second premolar and second molar of an artificial epoxy resin mandible. From this model, five titanium and five zirconia frameworks of similar design were fabricated by means of computer numeric controlled milling. Strain gauges were mounted around each implant to assess strain development as a result of framework fit/misfit. In addition, the vertical gap at the framework-implant interface was measured using an optical microscope when only one screw was tightened (one-screw test) and when both screws were tightened (two-screw test). The vertical fit of the frameworks was altered by introducing one to three nominally 30-Μm steel shims on one of the implants. The data were analyzed statistically using one-way analysis of variance and the Mann-Whitney test. For each condition, a measurable amount of strain was re...
Although several lateral occlusion philosophies have been proposed in the literature, there is a ... more Although several lateral occlusion philosophies have been proposed in the literature, there is a lack of compelling evidence supporting any scheme. The purpose of this systematic review was to investigate the clinical implications of different lateral occlusion schemes. A literature search was completed through PubMed (MEDLINE), Google Scholar, and Cochrane Library, up to January 2014. The literature search aimed to retrieve 2 study categories: group 1: comparative studies; group 2: clinical outcome studies. The inclusion criteria were peer-reviewed human clinical studies published in English. The search was further supplemented by manual searching through the reference lists of the selected studies. The initial search revealed a total of 680 studies; however, after applying the inclusion criteria, 26 studies were found suitable for the analysis (13 for group 1 and 13 for group 2). The most commonly evaluated lateral occlusion schemes were canine-guided occlusion (CGO) and group function occlusion (GFO). Group 1 studies evaluated the impact of lateral occlusion schemes on muscular electromyographic (EMG) activity, condylar displacement, mastication, and mandibular movement. Group 2 studies evaluated the impact of restored occlusion on longevity, patient comfort, and pathologic consequences. CGO was associated with narrower mastication and less EMG activity of the masticatory muscles during clenching. GFO was associated with wider mandibular movement and quicker mastication. During mastication, there was no difference in EMG activity between the 2 lateral occlusion schemes. Furthermore, the long-term studies indicated that there is no difference between the 2 schemes in patient comfort and restoration longevity. Although there are immediate differences between the different lateral occlusion schemes, patients have the capability to successfully adapt to CGO or GFO.
Recently, digital wax-up is proposed as a tool to aid prosthodontic planning. However, there are ... more Recently, digital wax-up is proposed as a tool to aid prosthodontic planning. However, there are no data about the effect of prosthodontic planning on lateral occlusion scheme. This study aims to evaluate the impact of conventional and digital prosthodontic planning on lateral occlusion scheme. Dental models of 10 patients were collected. All models had Angle Class I occlusion and were undergoing prosthodontic treatment that would influence the lateral occlusion scheme. Each set of models had received both conventional wax-up and digital wax-up. In relation to the lateral occlusion scheme, the following variables were evaluated: the prevalence of the different lateral occlusion scheme, number of contacting teeth and percentage of each contacting tooth. Four excursive positions on the working side were included: 0.5, 1.0, 2.0 and 3.0 mm from the maximal intercuspation position. The lateral occlusion scheme of the two wax-up models was subjected to alterations following excursion. There was a tendency for the prevalence of canine-guided occlusion to increase and for the prevalence of group function occlusion to decrease with increasing excursion. The number of contacting teeth was decreasing with the increasing magnitude of excursion. For the 0.5 mm and 1.0 mm positions, the two wax-ups had significantly greater contacts than the pre-treatment models, while at the 2.0 mm and 3.0 mm positions, all the models were similar. For all models, canines were the most commonly contacting teeth, followed by the teeth adjacent to them. No difference was observed between the two wax-ups in relation to the number of contacting teeth. Although the prosthodontic planning had influenced the pattern of the lateral occlusion scheme and contacts, there was no difference between the conventional and digital prosthodontic planning.
The International journal of oral & maxillofacial implants
To assess the influence of misfit of implant titanium and zirconia frameworks on peri-implant str... more To assess the influence of misfit of implant titanium and zirconia frameworks on peri-implant strains. Two Branemark implants were inserted in the areas of the mandibular left second premolar and second molar of an artificial epoxy resin mandible. From this model, five titanium and five zirconia frameworks of similar design were fabricated by means of computer numeric controlled milling. Strain gauges were mounted around each implant to assess strain development as a result of framework fit/misfit. In addition, the vertical gap at the framework-implant interface was measured using an optical microscope when only one screw was tightened (one-screw test) and when both screws were tightened (two-screw test). The vertical fit of the frameworks was altered by introducing one to three nominally 30-Μm steel shims on one of the implants. The data were analyzed statistically using one-way analysis of variance and the Mann-Whitney test. For each condition, a measurable amount of strain was re...
The aim of this study was to review the published literature investigating the accuracy of fit of... more The aim of this study was to review the published literature investigating the accuracy of fit of fixed implant frameworks fabricated using different materials and methods. A comprehensive electronic search was performed through PubMed (MEDLINE) using Boolean operators to combine key words. The search was limited to articles written in English and published through May 2010. In addition, a manual search through articles and reference lists retrieved from the electronic search and peer-reviewed journals was also conducted. A total of 248 articles were retrieved, and 26 met the specified inclusion criteria for the review. The selected articles assessed the fit of fixed implant frameworks fabricated by different techniques. The investigated fabrication approaches were one-piece casting, sectioning and reconnection, spark erosion with an electric discharge machine, computer-aided design/computer-assisted manufacturing (CAD/CAM), and framework bonding to prefabricated abutment cylinders....
The International journal of oral & maxillofacial implants
This review critically compares the available clinical and laboratory methods for assessing the f... more This review critically compares the available clinical and laboratory methods for assessing the fit of an implant prosthesis. MEDLINE and PubMed databases were searched for studies related to the fit of implant prostheses or the effect of misfit. Different combinations of key words were used. The screening procedure was performed in two stages. In the first stage, the relevant articles were selected. In the second stage, from those articles, specific inclusion and exclusion criteria were applied. Fifty-four articles were selected. Two different techniques were identified: in vitro and in vivo. The advantages, disadvantages, and limitations of each technique are discussed. There are clear limitations for the in vivo techniques. The in vitro techniques provide a more accurate measure of prosthesis misfit. Because of the variety of techniques and the different parameters assessed by each, it is useful to combine several techniques to assess the accuracy of fit, quantify the effect of m...
Adequate occlusal contacts are critical for masticatory function. The aim of this study is to eva... more Adequate occlusal contacts are critical for masticatory function. The aim of this study is to evaluate the intercuspal occlusal contacts following conventional and digital wax-ups. Stone casts of 15 patients undergoing prosthodontic treatment were gathered. Each cast was duplicated twice, so that conventional and digital wax-ups could be performed. To assess the occlusion, the following variables were evaluated: contact number per tooth (CNT), contact area per tooth (CAT) and contact accuracy. Further, the impact of tooth location in the arch was assessed. The CNT and CAT after the wax-ups increased significantly following each wax-up, and this increase was more prominent for the posterior teeth than the anterior teeth. The conventional wax-up was associated with lower CNT than the digital wax-up, especially for the posterior teeth. On the other hand, the CAT was greater for the conventional wax-up than the digital wax-up for the anterior and posterior teeth. In terms of accuracy, the two wax-ups showed greater discrepancies than the pre-treatment casts, however, the magnitude of discrepancy was greater for the digital wax-up. The two wax-ups improved the contact number and area. Despite the statistical variation between the wax-ups, the actual difference was minimal. Therefore, it could be speculated that the two wax-ups produced a similar outcome.
Purpose: To assess the implication of vertical misfit on strain within implant frameworks manufac... more Purpose: To assess the implication of vertical misfit on strain within implant frameworks manufactured in titanium or zirconia. Methods: A master model was fabricated by inserting a Brånemark implant in left side of a mandibular model in the area of the first premolar and the first molar. This model was used to fabricate identical frameworks, five in titanium and five in zirconia. A single strain gauge was mounted on the occlusal surface of each framework to assess strain development as a result of framework fitting. In addition, the peak-to-peak strain amplitude was measured for each framework to determine the strain pattern fluctuation. The vertical gap of the framework-implant interface was measured using a measuring microscope, when only one screw was tightened (1-screw test) and when both screws were tightened (2-screw test). The vertical fit of the frameworks was altered by adding one to three layers of 30 mm steel shims on one of the implants. Results: For all fitting conditions, measurable amount of strains were recorded, however, as the vertical misfit was introduced, linear increase in framework strain was detected. The titanium and zirconia frameworks exhibited similar strain activities. A direct relationship was observed between the framework strain and vertical gap. Conclusions: Framework misfit clearly influenced the framework strain magnitude and pattern. The framework material did not affect the framework strain for a similar level of misfit. Crown
The user has requested enhancement of the downloaded file. All in-text references underlined in b... more The user has requested enhancement of the downloaded file. All in-text references underlined in blue are added to the original document and are linked to publications on ResearchGate, letting you access and read them immediately.
Despite the predictable longevity of implant prosthesis, there is an ongoing interest to continue... more Despite the predictable longevity of implant prosthesis, there is an ongoing interest to continue to improve implant prosthodontic treatment and outcomes. One of the developments is the application of computer-aided design and computer-aided manufacturing (CAD/CAM) to produce implant abutments and frameworks from metal or ceramic materials. The aim of this narrative review is to critically evaluate the rationale of CAD/CAM utilization for implant prosthodontics. To date, CAD/CAM allows simplified production of precise and durable implant components. The precision of fit has been proven in several laboratory experiments and has been attributed to the design of implants. Milling also facilitates component fabrication from durable and aesthetic materials. With further development, it is expected that the CAD/CAM protocol will be further simplified. Although compelling clinical evidence supporting the superiority of CAD/CAM implant restorations is still lacking, it is envisioned that CAD/CAM may become the main stream for implant component fabrication.
In prosthodontics, conventional methods of fabrication of oral and facial prostheses have been co... more In prosthodontics, conventional methods of fabrication of oral and facial prostheses have been considered the gold standard for many years. The development of computer-aided manufacturing and the medical application of this industrial technology have provided an alternative way of fabricating oral and facial prostheses. This narrative review aims to evaluate the different streams of computer-aided manufacturing in prosthodontics. To date, there are two streams: the subtractive and the additive approaches. The differences reside in the processing protocols, materials used, and their respective accuracy. In general, there is a tendency for the subtractive method to provide more homogeneous objects with acceptable accuracy that may be more suitable for the production of intraoral prostheses where high occlusal forces are anticipated. Additive manufacturing methods have the ability to produce large workpieces with significant surface variation and competitive accuracy. Such advantages make them ideal for the fabrication of facial prostheses.
The aim of this study is to review all the published literature investigating the accuracy of fit... more The aim of this study is to review all the published literature investigating the accuracy of fit of zirconia fixed partial dentures (FPD). A comprehensive electronic search was performed through PubMed (MEDLINE) using Boolean operators to combine the following key words: 'zirconia,' 'margin,' 'FPD,' 'internal,' 'fit,' 'gap,' 'fitting surface,' 'bridge' and 'fixed prosthesis.' The search was limited to articles written in English, published up to January 2010. In addition, a manual search was also conducted through articles and reference lists retrieved from the electronic search and peerreviewed journals. A total of 115 articles were retrieved and only 15 met the specified inclusion criteria for the review. Twelve of these articles were in vitro and three of them were in vivo. The selected articles had assessed marginal and ⁄ or internal fit of zirconia FPDs against the effect of various parameters that were computer-aided design and com-puter-aided manufacturing (CAD ⁄ CAM) and CAM systems, post-sintered and pre-sintered milling, framework configuration, span length, veneer application and ageing. Conclusions: CAD ⁄ CAM, postsintered milling, straight configuration and shorter span frameworks provided superior results than CAM, pre-sintered milling, curved configuration and longer span frameworks. Veneering zirconia frameworks caused deterioration in fit, while ageing of zirconia had no implications on the fit. Further studies are needed to determine the clinical significance of the differences in the accuracy reported in this review.
Clinicians commonly encounter the dilemma of which lateral occlusion schemes is most suitable for... more Clinicians commonly encounter the dilemma of which lateral occlusion schemes is most suitable for a specific patient. The aim of this review is to evaluate the prevalence of the lateral occlusion schemes that exist naturally. An electronic search was completed through PubMed (MEDLINE), Google Scholar and Cochrane Library. The search was confined to peer-reviewed studies published in English, up to April 2013. The literature search was supplemented by manual searching through the bibliography lists of the selected studies. The initial search retrieved a total of 575 studies. After applying the selection criteria, only 12 studies were suitable for inclusion. The Critical Appraisal Skills Programme (CASP) tools were utilised to appraise the quality of the studies. The prevalence of canine-guided, group function and balanced occlusions was reported. Overall, there was a clear variability between the studies. The prevalence of the lateral occlusion schemes appears to be influenced by the following factors:
Improving dental esthetics is a main objective of prosthodontic treatment. Recently, digital diag... more Improving dental esthetics is a main objective of prosthodontic treatment. Recently, digital diagnostic waxing has been proposed as an alternative to conventional diagnostic waxing; however, the impact on esthetics has not been evaluated. The purpose of this study was to evaluate the impact of diagnostic waxing on biometric esthetic variables and to compare the esthetic outcome achieved by digital waxing with conventional waxing. Three biometric variables were evaluated: perceived frontal proportion (PFP), width/height (W:H) ratio, and symmetry. Maxillary casts of 13 patients were collected. All of them had maxillary anterior teeth that required prosthodontic treatment. Two forms of diagnostic waxing were executed: conventional and digital waxing. Measurements of the esthetic variables were conducted digitally. For the PFP, a frontal image was made and the width of each tooth was measured. Subsequently, the PFP values of the lateral incisor to central incisor and of the canine to central incisor were calculated. In addition, the height and width of each tooth was measured to calculate the W:H ratio. Using the previous measurements, the symmetry between the right and left sides was determined. No consistent or recurrent PFP was detected for any cast. The diagnostic waxing did not alter the PFP of the pretreatment casts. The diagnostic waxing had restored the W:H ratio to what is assumed to be a natural ratio. An improvement in symmetry was detected after the diagnostic waxing and was more prominent after the digital waxing. However, no significant difference was found between the 2 diagnostic waxing methods. The 2 diagnostic waxing methods influenced the esthetic variables of the anterior maxillary teeth and yielded similar outcomes. Digital waxing appears to be a reasonable alternative, but further investigations are needed to ensure its practicality.
The International journal of oral & maxillofacial implants
To assess the influence of misfit of implant titanium and zirconia frameworks on peri-implant str... more To assess the influence of misfit of implant titanium and zirconia frameworks on peri-implant strains. Two Branemark implants were inserted in the areas of the mandibular left second premolar and second molar of an artificial epoxy resin mandible. From this model, five titanium and five zirconia frameworks of similar design were fabricated by means of computer numeric controlled milling. Strain gauges were mounted around each implant to assess strain development as a result of framework fit/misfit. In addition, the vertical gap at the framework-implant interface was measured using an optical microscope when only one screw was tightened (one-screw test) and when both screws were tightened (two-screw test). The vertical fit of the frameworks was altered by introducing one to three nominally 30-Μm steel shims on one of the implants. The data were analyzed statistically using one-way analysis of variance and the Mann-Whitney test. For each condition, a measurable amount of strain was re...
Although several lateral occlusion philosophies have been proposed in the literature, there is a ... more Although several lateral occlusion philosophies have been proposed in the literature, there is a lack of compelling evidence supporting any scheme. The purpose of this systematic review was to investigate the clinical implications of different lateral occlusion schemes. A literature search was completed through PubMed (MEDLINE), Google Scholar, and Cochrane Library, up to January 2014. The literature search aimed to retrieve 2 study categories: group 1: comparative studies; group 2: clinical outcome studies. The inclusion criteria were peer-reviewed human clinical studies published in English. The search was further supplemented by manual searching through the reference lists of the selected studies. The initial search revealed a total of 680 studies; however, after applying the inclusion criteria, 26 studies were found suitable for the analysis (13 for group 1 and 13 for group 2). The most commonly evaluated lateral occlusion schemes were canine-guided occlusion (CGO) and group function occlusion (GFO). Group 1 studies evaluated the impact of lateral occlusion schemes on muscular electromyographic (EMG) activity, condylar displacement, mastication, and mandibular movement. Group 2 studies evaluated the impact of restored occlusion on longevity, patient comfort, and pathologic consequences. CGO was associated with narrower mastication and less EMG activity of the masticatory muscles during clenching. GFO was associated with wider mandibular movement and quicker mastication. During mastication, there was no difference in EMG activity between the 2 lateral occlusion schemes. Furthermore, the long-term studies indicated that there is no difference between the 2 schemes in patient comfort and restoration longevity. Although there are immediate differences between the different lateral occlusion schemes, patients have the capability to successfully adapt to CGO or GFO.
Recently, digital wax-up is proposed as a tool to aid prosthodontic planning. However, there are ... more Recently, digital wax-up is proposed as a tool to aid prosthodontic planning. However, there are no data about the effect of prosthodontic planning on lateral occlusion scheme. This study aims to evaluate the impact of conventional and digital prosthodontic planning on lateral occlusion scheme. Dental models of 10 patients were collected. All models had Angle Class I occlusion and were undergoing prosthodontic treatment that would influence the lateral occlusion scheme. Each set of models had received both conventional wax-up and digital wax-up. In relation to the lateral occlusion scheme, the following variables were evaluated: the prevalence of the different lateral occlusion scheme, number of contacting teeth and percentage of each contacting tooth. Four excursive positions on the working side were included: 0.5, 1.0, 2.0 and 3.0 mm from the maximal intercuspation position. The lateral occlusion scheme of the two wax-up models was subjected to alterations following excursion. There was a tendency for the prevalence of canine-guided occlusion to increase and for the prevalence of group function occlusion to decrease with increasing excursion. The number of contacting teeth was decreasing with the increasing magnitude of excursion. For the 0.5 mm and 1.0 mm positions, the two wax-ups had significantly greater contacts than the pre-treatment models, while at the 2.0 mm and 3.0 mm positions, all the models were similar. For all models, canines were the most commonly contacting teeth, followed by the teeth adjacent to them. No difference was observed between the two wax-ups in relation to the number of contacting teeth. Although the prosthodontic planning had influenced the pattern of the lateral occlusion scheme and contacts, there was no difference between the conventional and digital prosthodontic planning.
The International journal of oral & maxillofacial implants
To assess the influence of misfit of implant titanium and zirconia frameworks on peri-implant str... more To assess the influence of misfit of implant titanium and zirconia frameworks on peri-implant strains. Two Branemark implants were inserted in the areas of the mandibular left second premolar and second molar of an artificial epoxy resin mandible. From this model, five titanium and five zirconia frameworks of similar design were fabricated by means of computer numeric controlled milling. Strain gauges were mounted around each implant to assess strain development as a result of framework fit/misfit. In addition, the vertical gap at the framework-implant interface was measured using an optical microscope when only one screw was tightened (one-screw test) and when both screws were tightened (two-screw test). The vertical fit of the frameworks was altered by introducing one to three nominally 30-Μm steel shims on one of the implants. The data were analyzed statistically using one-way analysis of variance and the Mann-Whitney test. For each condition, a measurable amount of strain was re...
The aim of this study was to review the published literature investigating the accuracy of fit of... more The aim of this study was to review the published literature investigating the accuracy of fit of fixed implant frameworks fabricated using different materials and methods. A comprehensive electronic search was performed through PubMed (MEDLINE) using Boolean operators to combine key words. The search was limited to articles written in English and published through May 2010. In addition, a manual search through articles and reference lists retrieved from the electronic search and peer-reviewed journals was also conducted. A total of 248 articles were retrieved, and 26 met the specified inclusion criteria for the review. The selected articles assessed the fit of fixed implant frameworks fabricated by different techniques. The investigated fabrication approaches were one-piece casting, sectioning and reconnection, spark erosion with an electric discharge machine, computer-aided design/computer-assisted manufacturing (CAD/CAM), and framework bonding to prefabricated abutment cylinders....
The International journal of oral & maxillofacial implants
This review critically compares the available clinical and laboratory methods for assessing the f... more This review critically compares the available clinical and laboratory methods for assessing the fit of an implant prosthesis. MEDLINE and PubMed databases were searched for studies related to the fit of implant prostheses or the effect of misfit. Different combinations of key words were used. The screening procedure was performed in two stages. In the first stage, the relevant articles were selected. In the second stage, from those articles, specific inclusion and exclusion criteria were applied. Fifty-four articles were selected. Two different techniques were identified: in vitro and in vivo. The advantages, disadvantages, and limitations of each technique are discussed. There are clear limitations for the in vivo techniques. The in vitro techniques provide a more accurate measure of prosthesis misfit. Because of the variety of techniques and the different parameters assessed by each, it is useful to combine several techniques to assess the accuracy of fit, quantify the effect of m...
Adequate occlusal contacts are critical for masticatory function. The aim of this study is to eva... more Adequate occlusal contacts are critical for masticatory function. The aim of this study is to evaluate the intercuspal occlusal contacts following conventional and digital wax-ups. Stone casts of 15 patients undergoing prosthodontic treatment were gathered. Each cast was duplicated twice, so that conventional and digital wax-ups could be performed. To assess the occlusion, the following variables were evaluated: contact number per tooth (CNT), contact area per tooth (CAT) and contact accuracy. Further, the impact of tooth location in the arch was assessed. The CNT and CAT after the wax-ups increased significantly following each wax-up, and this increase was more prominent for the posterior teeth than the anterior teeth. The conventional wax-up was associated with lower CNT than the digital wax-up, especially for the posterior teeth. On the other hand, the CAT was greater for the conventional wax-up than the digital wax-up for the anterior and posterior teeth. In terms of accuracy, the two wax-ups showed greater discrepancies than the pre-treatment casts, however, the magnitude of discrepancy was greater for the digital wax-up. The two wax-ups improved the contact number and area. Despite the statistical variation between the wax-ups, the actual difference was minimal. Therefore, it could be speculated that the two wax-ups produced a similar outcome.
Purpose: To assess the implication of vertical misfit on strain within implant frameworks manufac... more Purpose: To assess the implication of vertical misfit on strain within implant frameworks manufactured in titanium or zirconia. Methods: A master model was fabricated by inserting a Brånemark implant in left side of a mandibular model in the area of the first premolar and the first molar. This model was used to fabricate identical frameworks, five in titanium and five in zirconia. A single strain gauge was mounted on the occlusal surface of each framework to assess strain development as a result of framework fitting. In addition, the peak-to-peak strain amplitude was measured for each framework to determine the strain pattern fluctuation. The vertical gap of the framework-implant interface was measured using a measuring microscope, when only one screw was tightened (1-screw test) and when both screws were tightened (2-screw test). The vertical fit of the frameworks was altered by adding one to three layers of 30 mm steel shims on one of the implants. Results: For all fitting conditions, measurable amount of strains were recorded, however, as the vertical misfit was introduced, linear increase in framework strain was detected. The titanium and zirconia frameworks exhibited similar strain activities. A direct relationship was observed between the framework strain and vertical gap. Conclusions: Framework misfit clearly influenced the framework strain magnitude and pattern. The framework material did not affect the framework strain for a similar level of misfit. Crown
The user has requested enhancement of the downloaded file. All in-text references underlined in b... more The user has requested enhancement of the downloaded file. All in-text references underlined in blue are added to the original document and are linked to publications on ResearchGate, letting you access and read them immediately.
Despite the predictable longevity of implant prosthesis, there is an ongoing interest to continue... more Despite the predictable longevity of implant prosthesis, there is an ongoing interest to continue to improve implant prosthodontic treatment and outcomes. One of the developments is the application of computer-aided design and computer-aided manufacturing (CAD/CAM) to produce implant abutments and frameworks from metal or ceramic materials. The aim of this narrative review is to critically evaluate the rationale of CAD/CAM utilization for implant prosthodontics. To date, CAD/CAM allows simplified production of precise and durable implant components. The precision of fit has been proven in several laboratory experiments and has been attributed to the design of implants. Milling also facilitates component fabrication from durable and aesthetic materials. With further development, it is expected that the CAD/CAM protocol will be further simplified. Although compelling clinical evidence supporting the superiority of CAD/CAM implant restorations is still lacking, it is envisioned that CAD/CAM may become the main stream for implant component fabrication.
In prosthodontics, conventional methods of fabrication of oral and facial prostheses have been co... more In prosthodontics, conventional methods of fabrication of oral and facial prostheses have been considered the gold standard for many years. The development of computer-aided manufacturing and the medical application of this industrial technology have provided an alternative way of fabricating oral and facial prostheses. This narrative review aims to evaluate the different streams of computer-aided manufacturing in prosthodontics. To date, there are two streams: the subtractive and the additive approaches. The differences reside in the processing protocols, materials used, and their respective accuracy. In general, there is a tendency for the subtractive method to provide more homogeneous objects with acceptable accuracy that may be more suitable for the production of intraoral prostheses where high occlusal forces are anticipated. Additive manufacturing methods have the ability to produce large workpieces with significant surface variation and competitive accuracy. Such advantages make them ideal for the fabrication of facial prostheses.
The aim of this study is to review all the published literature investigating the accuracy of fit... more The aim of this study is to review all the published literature investigating the accuracy of fit of zirconia fixed partial dentures (FPD). A comprehensive electronic search was performed through PubMed (MEDLINE) using Boolean operators to combine the following key words: 'zirconia,' 'margin,' 'FPD,' 'internal,' 'fit,' 'gap,' 'fitting surface,' 'bridge' and 'fixed prosthesis.' The search was limited to articles written in English, published up to January 2010. In addition, a manual search was also conducted through articles and reference lists retrieved from the electronic search and peerreviewed journals. A total of 115 articles were retrieved and only 15 met the specified inclusion criteria for the review. Twelve of these articles were in vitro and three of them were in vivo. The selected articles had assessed marginal and ⁄ or internal fit of zirconia FPDs against the effect of various parameters that were computer-aided design and com-puter-aided manufacturing (CAD ⁄ CAM) and CAM systems, post-sintered and pre-sintered milling, framework configuration, span length, veneer application and ageing. Conclusions: CAD ⁄ CAM, postsintered milling, straight configuration and shorter span frameworks provided superior results than CAM, pre-sintered milling, curved configuration and longer span frameworks. Veneering zirconia frameworks caused deterioration in fit, while ageing of zirconia had no implications on the fit. Further studies are needed to determine the clinical significance of the differences in the accuracy reported in this review.
Clinicians commonly encounter the dilemma of which lateral occlusion schemes is most suitable for... more Clinicians commonly encounter the dilemma of which lateral occlusion schemes is most suitable for a specific patient. The aim of this review is to evaluate the prevalence of the lateral occlusion schemes that exist naturally. An electronic search was completed through PubMed (MEDLINE), Google Scholar and Cochrane Library. The search was confined to peer-reviewed studies published in English, up to April 2013. The literature search was supplemented by manual searching through the bibliography lists of the selected studies. The initial search retrieved a total of 575 studies. After applying the selection criteria, only 12 studies were suitable for inclusion. The Critical Appraisal Skills Programme (CASP) tools were utilised to appraise the quality of the studies. The prevalence of canine-guided, group function and balanced occlusions was reported. Overall, there was a clear variability between the studies. The prevalence of the lateral occlusion schemes appears to be influenced by the following factors:
Uploads
Papers by Jaafar Abduo