Fracture Resistance and Cusp Deflection of Lined or Non-lined Composite and Glass Hybrid Restorations Over Residual Demineralized Dentin.

Michael Sawalt, S. Paris, U. Blunck, F. Schwendicke
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引用次数: 3

Abstract

PURPOSE To assess the fracture resistance (FR) and cusp deflection (CD) of lined or non-lined composite (CO) and glass hybrid (GH) restorations over residual demineralized dentin. MATERIALS AND METHODS In 48 extracted human premolars, artificial residual demineralized dentin was induced on pulpo-axial walls of standardized cavities. Various restorations were placed over this demineralized dentin: an experimental GH, a composite restoration (OptiBond FL+Tetric EvoCeram) without lining, or composite restorations with non-setting (Hypocal) or setting (Dycal) calcium hydroxide lining. After thermomechanical cycling, groups (n = 12) were compared regarding their CD and FR. RESULTS CD did not differ significantly between groups. FR was significantly lower in teeth restored with GH (median: 238 N; 25th/75th percentiles: 191/287 N) than in those restored with lined or non-lined composites (median range: 517-569 N; p < 0.05/Mann-Whitney), which did not differ significantly from each other (p > 0.05). CONCLUSION Within the conditions of this in vitro study, CH lining of pulpo-axial walls had only limited impact on CD and FR. GH showed the lowest FR and might not be optimal for restoring deep or extended cavitated lesions.
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内衬或非内衬复合材料和玻璃混合修复体在残余脱矿牙本质上的抗断裂性和尖端挠度。
目的评价内衬复合材料(CO)和非内衬复合材料(GH)修复体对残留脱矿牙本质的抗骨折性(FR)和牙尖挠度(CD)。材料与方法将48颗提取的人前磨牙在标准牙槽的牙髓轴壁上诱导人工残余脱矿牙本质。在脱矿牙本质上放置各种修复体:实验性GH,没有衬里的复合修复体(OptiBond FL+Tetric EvoCeram),或不固定(Hypocal)或固定(Dycal)氢氧化钙衬里的复合修复体。经热机械循环后,比较各组(n = 12)的CD和fr。结果各组间scd无显著差异。生长激素修复牙的FR显著降低(中位数:238 N;25日/第75百分位数:191/287 N)比恢复与排列或非线性复合材料(中值范围:517 - 569 N;p < 0.05/Mann-Whitney),差异不显著(p > 0.05)。结论:在本体外研究条件下,髓轴壁CH衬里对CD和FR的影响有限,GH的FR最低,可能不是修复深度或扩展空化病变的最佳选择。
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