Clinical Marginal and Internal Fit of Crowns Fabricated Using Different CAD/CAM Technologies
Clinical Marginal and Internal Fit of Crowns Fabricated Using Different CAD/CAM Technologies
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DOI：
10.1111/jopr.12209
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发表时间：
2015-06-01
影响因子：
4
通讯作者：
Zhang, Xiuyin
中科院分区：
文献类型：
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作者：
Huang, Zhuoli;Zhang, Lu;Zhang, Xiuyin
本研究的目的是比较选择性激光熔融法和两种CAD/CAM磨削法制作的单个全冠的边缘适合性和内部适合性，并评价牙型对测量参数的影响。材料与方法对270个全冠进行评价，包括90个选择性激光熔融金属烤瓷冠(B组)、90个氧化锆基陶瓷全冠(L组)和90个二硅酸锂陶瓷全冠(C组)。使用复制技术记录冠的边缘和内部间隙，用硅胶指示剂糊剂固定光体硅胶。将GAP复制品标本在颊舌面和近远端进行切片，然后用放大30倍的体视显微镜进行检查。在每个前磨牙和前磨牙标本上测量10个参考点，在每个磨牙标本上测量20个参考点。结果B组的平均边缘适合度显著好于C组和L组(p<；0.005)，而C组和L组之间差异无统计学意义(p>；0.05)。B组的平均轴向间隙明显小于C组和L组(p<；0.01)，而C组与L组无显著差异(p>；0.05)。B组的平均咬合间隙明显大于C组和L组(p<；0.05)，而C组和L组之间差异无统计学意义(p>；0.05)。不同牙型的牙冠边缘间隙和内部间隙差异无统计学意义(p>；0.05)。结论SLM磨削系统与所研究的两种CAD/CAM磨削系统相比具有更好的边缘和内部适合性。牙齿类型对边缘适合性和内部适合性没有显著影响。
PurposeThe aims of this in vivo investigation were to compare the marginal and internal fit of single-unit crowns fabricated using a selective laser melting (SLM) procedure with two CAD/CAM grinding procedures, and to evaluate the influence of tooth type on the parameters measured.Materials and MethodsA total of 270 crowns were evaluated, including 90 SLM metal-ceramic crowns (group B), 90 zirconium-oxide-based ceramic crowns (group L), and 90 lithium disilicate ceramic crowns (group C). The marginal and internal gaps of the crowns were recorded using a replica technique with a silicone indicator paste stabilized with a light-body silicone. The gap replica specimen were sectioned buccolingually and mesiodistally and then examined using a stereomicroscope at 30x magnification. Ten reference points were measured on each anterior and premolar specimen, and 20 reference points were measured on each molar specimen. Two-way ANOVA was performed to identify the significant differences between the groups.ResultsThe mean marginal fit of group B was significantly better than those of group C and group L (p < 0.005), but a significant difference was not found between group C and group L (p > 0.05). The mean axial gap of group B was significantly smaller than those of group C and group L (p < 0.01), while group C was not different from group L (p > 0.05). The mean occlusal gap of group B was significantly higher than those of group C and group L (p < 0.05), and no difference was found between group C and group L (p > 0.05). The marginal and internal gaps of crowns varying according to tooth type were not significantly different (p > 0.05).ConclusionThe SLM system demonstrated better marginal and internal fit compared to the two CAD/CAM grinding systems examined. Tooth type did not significantly influence the marginal or internal fit.