Influence of resin composite insertion technique in preparations with a high C-factor
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Data
2007-11-01
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Coorientador
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Objective: To evaluate the marginal microleakage in enamel and dentin/cementum walls in preparations with a high C-factor, using 3 resin composite insertion techniques. The null hypothesis was that there is no difference among the 3 resin composite insertion techniques. Method and Materials: Standardized Class 5 cavities were prepared in the lingual and buccal aspects of 30 caries-free, extracted third molars. The prepared teeth were randomly assigned to 3 groups: (1) oblique incremental placement technique, (2) horizontal incremental placement technique, and (3) bulk insertion (single increment). The preparations were restored with a 1-bottle adhesive (Single Bond, 3M ESPE) and microhybrid resin composite (Z100, 3M ESPE). Specimens were isolated with nail varnish except for a 2-mm-wide rim around the restoration and thermocycled (1,000 thermal cycles, 5°C/55°C; 30-second dwell time). The specimens were immersed in an aqueous solution of 50 wt% silver nitrate for 24 hours, followed by 8 hours in a photo-developing solution and evaluated for microleakage using an ordinal scale of 0 to 4. The microleakage scores obtained from occlusal and gingival walls were analyzed with Wilcoxon and Kruskal-Wallis nonparametric tests. Results: The null hypothesis was accepted. The horizontal incremental placement technique, the oblique incremental technique, and bulk insertion resulted in statistically similar enamel and dentin microleakage scores. Conclusion: Neither the incremental techniques nor the bulk placement technique were capable of eliminating the marginal microleakage in preparations with a high C-factor.
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Adhesion, Adhesive, C-factor, Dentin, Enamel, Resin composite, bisphenol A bis(2 hydroxypropyl) ether dimethacrylate, resin, resin cement, silicon dioxide, single bond, unclassified drug, Z100 composite resin, zirconium, cementation, classification, dental surgery, endodontics, human, methodology, molar tooth, nonparametric test, tooth disease, Bisphenol A-Glycidyl Methacrylate, Cementation, Composite Resins, Dental Cavity Preparation, Dental Leakage, Dental Restoration, Permanent, Humans, Marginal Adaptation (Dentistry), Molar, Third, Resin Cements, Silicon Dioxide, Statistics, Nonparametric, Zirconium
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Inglês
Como citar
Quintessence International, v. 38, n. 10, p. 829-835, 2007.