Kawai K, Leinfelder K F
Department of Operative Dentistry, Osaka University Faculty of Dentistry, Japan.
Am J Dent. 1995 Oct;8(5):249-52.
To determine the in vitro wear resistance and microstructural stability of composites in which the beta quartz insert was used.
Three different sized inserts were used in conjunction with P-50 and Herculite XR posterior resin composites. The study was designated to create varying gap dimensions between the insert and wall of the preparation (0.75, 1.25 and 1.50 mm). In addition, one half of the inserts contacted the dentin floor of the cavity whereas the other half rested on 1.0 mm of composite. The controls consisted of resin composite only. Using an in vitro wear testing device, all specimens were subjected to 400,000 cycles of masticatory loading. Upon completion of testing, profilometric tracings and SEM were used to determine relative wear, patterns of wear and microstructural changes. Differences, in wear values were analyzed by two-way ANOVA.
The wear values for P-50 and Herculite XR controls were 24.8 and 31.3 micrometers, respectively. No significant differences were detected (P<0.05) in amount of wear between the control specimens and the insert specimens, regardless of size. The same results were obtained regardless of whether the insert rested on dentin or resin composite. SEM evaluations however, revealed excellent interfacial continuity after wear testing. While the inserts did not influence the wear resistance, they may provide an excellent means for maintaining functional occlusion.
确定使用β-石英嵌体的复合材料的体外耐磨性和微观结构稳定性。
三种不同尺寸的嵌体与P-50和Herculite XR后牙树脂复合材料联合使用。该研究旨在在嵌体与预备体壁之间形成不同的间隙尺寸（0.75、1.25和1.50毫米）。此外，一半的嵌体与窝洞的牙本质底部接触，而另一半放置在1.0毫米厚的复合材料上。对照组仅由树脂复合材料组成。使用体外磨损测试装置，所有标本均接受400,000次咀嚼负荷循环。测试完成后，使用轮廓仪追踪和扫描电子显微镜来确定相对磨损、磨损模式和微观结构变化。磨损值的差异通过双向方差分析进行分析。
P-50和Herculite XR对照组的磨损值分别为24.8和31.3微米。无论尺寸大小，对照标本和嵌体标本之间的磨损量均未检测到显著差异（P<0.05）。无论嵌体是放置在牙本质上还是树脂复合材料上，都得到了相同的结果。然而，扫描电子显微镜评估显示，磨损测试后界面连续性良好。虽然嵌体不影响耐磨性，但它们可能为维持功能性咬合提供了一种极好的方法。
