Papers by Panarat Kodkeaw
Objective The purpose of this study was to analyze the first formant frequency (F1) and the secon... more Objective The purpose of this study was to analyze the first formant frequency (F1) and the second formant frequency (F2) then calculated the F1 range and the F2 range of five vowels [a], [i], [u], [e], and [o] from Thai male volunteers who do not have oral defects. Materials and methods Sound of five vowels [a], [i], [u], [e], and [o] from 67 volunteers from Chiang Mai and Chulalongkorn University were recorded with digital tape recorder. The five vowel sounds were analyzed by using Multi-speech 3700 program and Linear Predictive Coding (LPC) method. The F1 and the F2 were found and then the F1 range and the F2 range were calculated, respectively. Results The F1 and the F2 from both groups of volunteers were not statistically significant difference. When gathering the data of both groups, it was found that the highest value of the F1 and the F2 were at [a] (706.17 Hz) and [i] (2011.16 Hz), respectively. The lowest value of the F1 and the F2 were found at [u] (282.94 Hz) and [o] (91...
Photograph provides information and reliable legal evidence in clinical dental practice. This stu... more Photograph provides information and reliable legal evidence in clinical dental practice. This study compared the dimensional difference of digital images taken directly and from 5 photographic mirrors (2 coated glass mirrors and 3 stainless mirrors) using SLR digital camera (Canon 450D) equipped with 60 and 100 mm macro lens (Canon EF-S 60 mm f/2.8 and Cannon EF 100 mm f/2.8). The in vitro situation was set up to control the photographic factor. Ten photographs from each group were measured using image analyzing software. The data of 19 landmark distance from each photograph was analyzed statistically using one-way ANOVA and Scheffe’s multiple comparison (α=0.05). The dimension of images taken from photographic mirror was different from taken directly in a range of 0.00-0.14 millimeters for 60 mm macro lens and 0.00-0.24 millimeters for 100 mm macro lens. The number of landmark distance of images taken from photographic mirror that significantly different from image taken directly w...
Objectives The purposes of this study were to determine the physical properties of tissue conditi... more Objectives The purposes of this study were to determine the physical properties of tissue conditioners which were cleaned by denture cleansers according to the manufacturers’ recommendations and soaked in tab water continuously for 3 weeks. Materials and Methods The study was carried on by using 4 brands of tissue conditioners (COE-SOFT™, Dura Conditioner, Trusoft™, and Visco-gel) and 3 brands of denture cleansers (Polident, Steradent, and Clean A Dent). Five hundred and twenty dumbbell shaped specimens (according to ISO 37 standard) were divided into 52 groups depending on the different tissue conditioners, denture cleansers and duration of soaking time. The color of each specimen was measured using the Ultrascan XE and the differences of color (∆E) were then calculated. Durometer type A was used to test the tensile properties of the materials. The data were collected and analyzed statistically. The one-way ANOVA was used to analyze the differences among groups of each week and at ...
Chulalongkorn University Dental Journal วารสารทันตแพทยศาสตร์ จุฬาลงกรณ์มหาวิทยาลัย, May 4, 2013
Objective to study the effect of cigarette smoke and denture cleansers on the color and the surfa... more Objective to study the effect of cigarette smoke and denture cleansers on the color and the surface hardness of acrylic resin sheets with or without surface treatment. Materials and methods Two hundred specimens of 15x15x3 mm acrylic resin sheets were divided into four surface treatment groups (conventionally polished with polishing wax as a control group, Bosworth Glaze TM , Palaseal ® and Plaquit coated groups). The color and surface hardness were measured before and after cigarette smoke staining. Then, each group was divided into five subgroups for immersion in water and other four denture cleansers (Bonyplus, Fitty ® Dent, Polident and Steradent). The color and surface hardness were redetermined. Data were analyzed for color test after cigarette smoke staining and after immersion in denture cleansers using One-Way Analysis of Variance and Two-Way Analysis of Variance, respectively with Tamhane’s multiple comparison. Paired sample T-test (α = 0.05) was used to analyze the data from surface hardness test. Results The color change due to cigarette smoke in all glazed groups were significantly less than the control group while the denture cleansers did not significantly affect the color changes. However, the conventionally polished control groups showed significantly different in color change when immersed in water. According to the surface hardness test, application of Plaquit produced the hardest surface while the surface treated with Bosworth Glaze TM exhibited the lowest surface hardness. After staining and denture cleansers immersion, all glazed groups and control group exhibited changes in the surface hardness values except the surface treated with Palaseal ® that was not different from the beginning. Conclusion The color change due to cigarette smoke in the conventionally polished with polishing wax group of acrylic resin was more than the glazed groups. All denture cleanser in every glazed group did not affect the color change. All glazing materials affect the surface hardness of acrylic resin both before and after denture cleansers immersion. (CU Dent J. 2010;33:77-88) Key words: acrylic resin; cigarette smoke; denture cleanser; glazing; staining; surface hardness
Chiang Mai Dental Journal เชียงใหม่ทันตแพทยสาร, Aug 11, 2011
°"√»÷°…"π' È ¡' «-µÿ ª√-ß §å ‡ae◊ Ë Õ«-¥¢π"¥°√-¥Ÿ° ‡ ∫â "µ"∑' Ë µ"•Àπà ßµà "ßÊ "À√-∫' Ë ßª≈Ÿ°Ω... more °"√»÷°…"π' È ¡' «-µÿ ª√-ß §å ‡ae◊ Ë Õ«-¥¢π"¥°√-¥Ÿ° ‡ ∫â "µ"∑' Ë µ"•Àπà ßµà "ßÊ "À√-∫' Ë ßª≈Ÿ°Ωí ß∫√' ‡«≥¢" ‡∫â "µ"∑' Ë µ"•Àπà ßµà "ßÊ "À√-∫' Ë ßª≈Ÿ°Ωí ß∫√' ‡«≥¢" ‡∫â "µ"∑' Ë µ"•Àπà ßµà "ßÊ "À√-∫'°√ √‰°√-"∫Àπâ " ‚¥¬"™â ¿"ae√-ß' à «πµ-¥Õ"»-¬ §Õ¡ae' «-‡µÕ√å ∑"ß∑-πµ°√√¡∑' Ë ∂Ÿ°•ª≈߉ª ‡ªì π¿"ae"¡¡' µ' ¢Õß Õ""¡-§√™"«‰∑¬ ®"π«π 30 √"¬ ª√-°Õ∫¥â «¬ ‡ae» À≠' ß 24 √"¬ •≈-‡ae»™"¬ 6 √"¬ °"√«-¥∑""π°√-¥Ÿ° 3 ™' È π∑' Ë ª√-°Õ∫¢÷ È π ‡ªì π¢Õ∫ ‡∫â "µ" §◊ Õ °√-¥Ÿ°Àπâ "º"°
Chulalongkorn University Dental Journal วารสารทันตแพทยศาสตร์ จุฬาลงกรณ์มหาวิทยาลัย, Aug 20, 2013
Thailand is facing to the problems in population structure that transit to an aging society. The ... more Thailand is facing to the problems in population structure that transit to an aging society. The increase of average age together with the health problems especially chronic disease always affects oral health. Because of the impaction on eating, communication, comfort, appearance, and socializing, the oral health status usually affected to the quality of life. Thus, the proper oral health care and tooth preservation are important issues. This article presents Thailand National Oral Health survey reported by focusing on the elderly group. The content includes the oral health status, the problems of tooth loss, the situation of denture placement, and the initiation of strategic plan for solving the oral health problems in Thai elderly. (CU Dent J. 2013;36:117-28) Key words: denture placement; oral health status; Thai elderly
Journal of the Dental Association of Thailand วารสารวิทยาสารทันตแพทยศาสตร์, Mar 25, 2010
The main reason for using denture adhesives is to increase adhesion. Testing of the adhesion prop... more The main reason for using denture adhesives is to increase adhesion. Testing of the adhesion properties requires reliable instruments, equipment and methods together with repeatability for comparison. In addition, there were limitations of in vitro testing methods led to an adhesion value that did not represent those which occurred intraorally. The objective of this study was to create testing machines, instrument and methods for denture adhesive testing. The results showed that the Pi 2 method using pig skin and acrylic plate models was able to solve this in vitro problem. Since the available instrumentations for in vivo testing method were quite complicated, the Pi 3 method was then developed by using acrylic resin palatal plate and an adhesion testing instrument based on a balance beam composed of an analog force gauge, a force controller and a head positioning device. From the trial testing, it was found that the results from the Pi 2 method could be statistically analyzed to distinguish the differences between 6 formulated adhesive gels very well. For the Pi 3 method, the adhesion testing instrument was also very effective. However, selection criteria for the test groups should be carefully concerned. In conclusion, the Pi 2 and Pi 3 methods are effective in testing denture adhesives.
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Papers by Panarat Kodkeaw