8 results
Search Results
Now showing 1 - 8 of 8
Publication Open Access Clinical evaluation of class II high-viscosity glass ionomer cement and composite resin restorations in primary molars: one year result.(2014-05) Araya Phonghanyudh; อารยา พงษ์หาญยุทธ; Chutima Theerareungchaisri; ชุติมา ธีระเรืองไชยศรี; Varangkana Jirarattanasopa; วรางคณา จิรรัตนโสภา; Araya Phonghanyudh; อารยา พงษ์หาญยุทธ; Mahidol University. Faculty of Dentistry. Department of Pediatric Dentistryof primary molars with proximal dentin carious lesions in 37 children, aged 6-9 years, were studied. A split-mouth technique was designed. The teeth were randomly divided into 2 groups of restorative materials: highly viscous GIC ( Fuji IX GP:GC Co., TokyoPublication Open Access Effect of the shades of background substructures on the overall color of zirconia-based all-ceramic crowns.(2013-08) Kallaya Suputtamongkol; กัลยา ศุพุทธมงคล; Chantana Tulapornchai; ฉันทนา ตุลาพรชัย; Jatuphol Mamani; Wannaporn Kamchatphai; วรรณพร กำจัดภัย; Noparat Thongpun; นพรัตน์ ทองพันธ์; Kallaya Suputtamongkol; กัลยา ศุพุทธมงคล; Mahidol University. Faculty of Dentistry. Prosthodontics DepartmentPURPOSE: The objective of this study was to determine the effect of the color of a background substructure on the overall color of a zirconia-based all-ceramic crown. MATERIALS AND METHODS: Twenty one posterior zirconia crowns were made for twenty subjects. Seven premolar crowns and six molar crowns were cemented onto abutments with metal post and core in the first and second group. In the third group, eight molar crowns were cemented onto abutments with a prefabricated post and composite core build-up. The color measurements of all-ceramic crowns were made before try-in, before and after cementation. A repeated measure ANOVA was used for a statistical analysis of a color change of all-ceramic crowns at α=.05. Twenty four zirconia specimens, with different core thicknesses (0.4-1 mm) were also prepared to obtain the contrast ratio of zirconia materials after veneering. RESULTS: L(*) , a(*) , and b(*) values of all-ceramic crowns cemented either on a metal cast post and core or on a prefabricated post did not show significant changes (P>.05). However, the slight color changes of zirconia crowns were detected and represented by ΔE(*) ab values, ranging from 1.2 to 3.1. The contrast ratios of zirconia specimens were 0.92-0.95 after veneering. CONCLUSION: No significant differences were observed between the L(*) , a(*) , and b(*) values of zirconia crowns cemented either on a metal cast post and core or a prefabricated post and composite core. However, the color of a background substructure could affect the overall color of posterior zirconia restorations with clinically recommended core thickness according to ΔE(*) ab values.Publication Open Access Clinical performance and wear characteristics of veneered lithia-disilicate-based ceramiccrowns.(2008-05) Kallaya Suputtamongkola; Anusavice, Kenneth J.; Chatcharee Suchatlamponga; Phira Sithiamnuaia; Chantana Tulapornchai; กัลยา ศุพุทธมงคล; ชัชรี สุชาติล้ำพงศ์; พีระ สิทธิอำนวย; ฉันทนา ตุลาพรชัย; Kallaya Suputtamongkol; กัลยา ศุพุทธมงคลwear volumes for the ceramic crowns after 1 year were 0.19 (0.065)mm3 for premolar sites and 0.34 (0.08)mm3 for molar sites. The mean occlusal wear volumes of opposing enamel after 1 year were 0.21 (0.06)mm3 for premolar teeth and 0.50 (0.22)mm3... for molar teeth. The mean occlusal wear volume of ceramic molar crowns was significantly lower than the volume of enamel wear of the opposing teeth (p?0.05). Conclusions. The quality of the overall prostheses and the gingival tissues were acceptable after 1Publication Open Access The comparison of the marginal gaps of zirconia framework luted with different types of phosphate based-resin cements.(2015-09) Wipada Lertrid; วิภาดา เลิศฤทธิ์; Darunee Owitayakul; ดรุณี โอวิทยากุล; Chuchai Anatamana; ชูชัย อนันต์มานะ; Piyapanna Pittayachawan; ปิยพรรณา พิทยชวาล; Piyapanna Pittayachawan; ปิยพรรณา พิทยชวาล; Mahidol University. Faculty of Dentistry. Department of Advanced General Dentistry; Mahidol University. Faculty of Dentistry. Department of Prosthodonticluted with two types of phosphate based resin cements. Materials and methods: Thirty maxillary premolar teeth were randomly divided into two groups (n=15); a self-etch (Panavia F2.0; Kuraray Medical, Japan) and self-adhesive (Rely X U100; 3MESPE, USA...) resin cements. The teeth were prepared with round shoulder and the 6° convergence angle. The zirconia frameworks were fabricated using TDS® CAD/CAM system (Total Dental Solution, Changhua, Taiwan). The marginal fits of zirconia frameworks were evaluatedPublication Open Access Gap comparison between single crown and three-unit bridge zirconia substructures.(2014-08) Chuchai Anunmana; ชูชัย อนันต์มานะ; Chanavut Asvanund; ชนวุตม์ อัศวนันท์; Masnisa Charoenchitt; Chuchai Anunmana; ชูชัย อนันต์มานะ; Mahidol University. Faculty of Dentistry. Department of ProsthodonticsPURPOSE To compare marginal and internal gaps of zirconia substructure of single crowns with those of three-unit fixed dental prostheses. MATERIALS AND METHODS Standardized Co-Cr alloy simulated second premolar and second molar abutments were fabricated and subsequently duplicated into type-III dental stone for working casts. After that, all zirconia substructures were made using Lava™ system. Marginal and internal gaps were measured in 2 planes (mesial-distal plane and buccal-palatal plane) at 5 locations: marginal opening (MO), chamfer area (CA), axial wall (AW), cusp tip (CT) and mid-occlusal (OA) using Replica technique. RESULTS There were significant differences between gaps at all locations. The mean ± SD of marginal gap in premolar was 43.6 ± 0.4 µm and 46.5 ± 0.5 µm for single crown and 3-unit bridge substructure respectively. For molar substructure the mean ± SD of marginal gap was 48.5 ± 0.4 µm and 52.6 ± 0.4 µm for single crown and 3-unit bridge respectively. The largest gaps were found at the occlusal area, which was 150.5 ± 0.5 µm and 154.5 ± 0.4 µm for single and 3-unit bridge premolar substructures respectively and 146.5 ± 0.4 µm and 211.5 ± 0.4 µm for single and 3-unit bridge molar substructure respectively. CONCLUSION Independent-samples t-test showed significant differences of gap in zirconia substructure between single crowns and three-unit bridge (P<.001). Therefore, the span length has the effect on the fit of zirconia substructure that is fabricated using CAD/CAM technique especially at the occlusal area.Publication Open Access Marginal and internal fits of zirconia single crown and Four-unit Fixed Dental Prostheses Substructures.(2015-09) Kulnaree Charukietkajorn; กุลนรี จารุเกียรติขจร; Chuchai Anunmana; ชูชัย อนันต์มานะ; Chuchai Anunmana; ชูชัย อนันต์มานะ; Mahidol University. Faculty of Dentistry. Department of ProsthodonticsPurpose: To compare marginal and internal gaps of zirconia single crown substructures with those of four-unit fixed dental prostheses substructures. Materials and Methods: A standard Co-Cr model of maxillary first premolar and maxillary second molar abutments was made. Twenty polyether impressions of the standard model were taken and subsequently poured with type-IV dental stone. Zirconia substructures were fabricated as premolar and molar single crowns (Cr, n=10) and four-unit bridges (Br, n=10) using LAVA™ Zirconia system. The gaps between substructures and their standard abutments were evaluated using silicone replica technique. Twenty-two different points were measured along the marginal and internal surfaces. The differences of the gap widths between single crown and four-unit bridge substructures were analyzed using Mann Whitney U-test (α=0.05). Results: There was significant difference of marginal gap between Cr and Br groups at mesial marginal gap of molar (30±44 and 112±19 µm for Cr and Br, respectively). For the internal gaps, mid-occlusal point revealed the largest gap. No significant difference of internal gaps between Cr and Br groups was observed except at some points of mesial chamfer area of molar (123±18 and 218±33 µm for Cr and Br, respectively) and at buccal axial wall of premolar (45±15 and 76±47 µm for Cr and Br, respectively). Conclusions: The differences between the gaps of zirconia single crown and those of four-unit bridge substructures were found at the mesial side of molar marginal area. Most of internal gaps of single crown substructures did not significantly differ from those of four-unit bridge substructuresPublication Open Access Effect of denture cleanser containing longan-extract granules on color stability, surface roughness and hardness of a polymeric denture base material.(2011-05) Nalinee Udomchaisakul; นลินี อุดมชัยสกุล; Widchaya Kanchanavasita; วิชญ กาญจนะวสิต; Waranun Buajeeb; วรานนท์ บัวจีบ; Widchaya Kanchanavasita; วิชญ กาญจนะวสิต; Mahidol University. Faculty of Dentistry. Department of Prosthodontics; Mahidol University. Faculty of Dentistry. Department of Oral Medicine and PeriodontologyObjective: To investigate the change of color, surface roughness and surface hardness of a PMMA denture base material after immersion in solution prepared from longan-extract granules compared with denture cleanser without longan-extract granules and distilled water. Materials and methods: Circular discs of SR Triplex Hot with 30 mm. in diameter and 3 mm. in thickness (n=10) were immersed in denture cleanser containing longan-extract granules, denture cleanser without longan-extract granules or distilled water for 10 cycles of 30 minutes. Color stability, surface roughness and hardness were measured before and after immersion in those solutions for 5th and 10th cycles by using colorimeter, profilometer and Knoop hardness tester, respectively. Split-Plot ANOVA was used for analyzing the influence of denture cleanser solutions and storage times on the surface color stability, surface roughness and hardness of PMMA denture base material at a 0.05 significant level. Results and conclusions: The type of denture cleansers and immersion cycle had no influence on the color change and surface roughness. Also the result of surface hardness test of between-subjects effects (solution) and the interaction of both effects were not significant different (p>0.05), but the tests of within-subjects effects (immersion cycle) was significant different (p<0.05). So, Knoop hardness test was not modified by any solutions but decreased over time. The values of NBS ratings which is the way color changes evaluated by the human eye showed that the color change of all specimens after immersion in all solutions at 5th and 10th cycles were çtrace to slighté.Publication Open Access รอยคราบสีดำบนฟันบริเวณเหนือขอบเหงือกในเด็ก(2011-09) เข็มทอง มิตรกูล; Kemthong Mitrakul; เข็มทอง มิตรกูล; Kemthong Mitrakul; มหาวิทยาลัยมหิดล. คณะทันตแพทยศาสตร์. ภาควิชาทันตกรรมเด็กรอยคราบสีดำบนฟันบริเวณเหนือขอบเหงือกในเด็กพบได้บ่อยครั้งไม่ก่อให้เกิดความเจ็บปวดแต่ส่งผลต่อความสวยงาม ในบทความนี้ได้ศึกษารวบรวมลักษณะเเฉพาะตัวทางคลินิก ความชุก สาเหตุการวินิจฉัย บทบาทของเชื้อแบคทีเรียที่เกี่ยวข้องและงานวิจัยที่ทันสมัย รวมทั้งความสัมพันธ์ระหว่างความชุกของรอยคราบนี้กับอัตราการเกิดโรคฟันผุที่ลดลงและความสัมพันธ์ระหว่างความรุนแรงของรอยคราบกับความรุนแรงของโรคฟันผุ รวมทั้งบทบาทของทันตแพทย์ในการดูแล ให้คำแนะนำ ในกรณีที่พบผู้ป่วยที่มีรอยคราบนี้ได้