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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 DentistryObjective: To evaluate the clinical and radiographic performances of highly viscous glass ionomer cement (GIC) and composite resin (CR) class II restorations in primary molars at 12-month follow-up. Materials and methods: Fifty-five pairs of 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., Tokyo, Japan) and CR ( Filtek Z250:3M ESPE, St. Paul, U.S.A.). The restorations were evaluated clinically at 6 and 12 months following modified USPHS criteria. Bitewing radiographs were assessed at 12-month follow-up. All parameters of clinical and radiographic performances between the two groups were tested by Wilcoxon matched-pair signed-rank test. Results: The cumulative failure rates of GIC and CR restorations at 12-month follow-up were 2.08% and 4.41% respectively. There was no statistically significant difference in the failure rate of both materials. There were no statistically significant differences in the clinical and radiographic performances between the two groups. All parameters both clinical and radiographical were similar between GIC and CR restorations. Conclusion: Highly viscous glass ionomer cement and composite resin were highly effective materials for class II restoration in primary molars from 12- month results.Publication 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 ศุพุทธมงคลObjectives. The objectives of this study were to characterize the clinical performance and wear characteristics of lithia-disilicate-based ceramic crowns. Methods. Thirty posterior crowns were made using the heat-pressing technique and lithiadisilicate- based core ceramic. Subjects were recalled annually. The quality of crowns and adjacent gingival tissueswere examined using nine criteria for acceptability. All crownswere examined and ranked from 4 (Excellent) to 1 (Unacceptable) for each criterion. Impressions were made for replica models at each appointment. Wear characteristics of dental ceramic and enamelwere obtained by comparing the surface of the original model with the follow-up model using a laser scanner. Results. Twenty-nine subjects returned for the 1-year recall examination. The maximum clenching force for the 30 subjects ranged from 125 to 815N. All clinical criteria were ranked good to excellent at the 1-year recall exam and no fractures were observed. The mean occlusal wear 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 1 year. The mean occlusal wear volume of ceramic molar crowns was significantly lower than the enamel wear volume of the opposing teeth.Publication Open Access Prosthetic rehabilitation of orbital defects: A review of 110 cases.(2014-09) Sita Thaworanunta; สิตา ถาวรนันท์; Theerathavaj Srithavaj; ธีรธวัช ศรีธวัช; Shrestha, Binit; Shrestha, Binit; Mhidol University. Faculty of Dentistry. Department of Prosthodonticsdiscoloration of the prosthesis, open or torn margins, and acrylic housing dislodgment. Conclusion: The use of silicone prosthesis can be a safe, predictable and aesthetic treatment option for rehabilitation of orbital defects. However, focus on patientPublication Open Access รอยคราบสีดำบนฟันบริเวณเหนือขอบเหงือกในเด็ก(2011-09) เข็มทอง มิตรกูล; Kemthong Mitrakul; เข็มทอง มิตรกูล; Kemthong Mitrakul; มหาวิทยาลัยมหิดล. คณะทันตแพทยศาสตร์. ภาควิชาทันตกรรมเด็กBlack tooth stain is one of common problems in pediatric dentistry. Even though it does not result in pain but it associates with esthetic which most parents are concern about. In this article, etiology, prevalence, possible causes, associatedPublication 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 ProsthodonticObjective: Phosphase based-resin cements are known to chemically bond to zirconia ceramics. Additionally, they are the cement of choice for these materials. Therefore, the aim of this study was to evaluate the marginal gaps of zirconia frameworks luted 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 evaluated under a microscope (MM-11C, Nikon, Tokyo, Japan) (30x magnification) at the following sequences: before cementation, after cementation and after 20,000 thermocycles. The differences in the marginal gaps (after and before cementation: delta diff1, after thermocycling and after cementation: delta diff2) between two resin cements were analyzed with Student’s t-test and Mann Whitney U test. The differences between two processes in each group were tested with paired t-test and Wilcoxon signed-rank test (p<0.05). Results: After cementation, the marginal gaps of two resin cements were significantly higher than before cementation (p<0.001). The slight differences were found in mean of delta diff2 (self-etch: 0.88 µm, self-adhesive: 0.26 µm). The marginal gaps of zirconia frameworks cemented with self-adhesive resin cement were significantly smaller than self-etch resin cement both after cementation and after thermocycling (p<0.05). Conclusions: Long-term thermocycling had no clinical effect on the marginal fit. The type of resin cements influenced the marginal fit. The marginal gaps achieved by both resin cements were within clinically accepted standards (<120 µm).Publication 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 substructures