Clinical assessment of enamel wear caused by monolithic zirconia crowns
Clinical assessment of enamel wear caused by monolithic zirconia crowns
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DOI：
10.1111/joor.12409
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发表时间：
2016-08-01
影响因子：
2.9
通讯作者：
Schmitter, M.
中科院分区：
文献类型：
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作者：
Stober, T.;Bermejo, J. L.;Schmitter, M.
本研究的目的是测量对抗性单块氧化锆冠引起的牙釉质磨损，并与对侧天然拮抗剂引起的牙釉质磨损进行比较。对20例患者进行了20个氧化锆全磨牙单瓷冠的修复。夜间咬肌活动度高（磨牙症）的患者被排除在外。为了分析磨损，在牙冠结合后以及6个月、12个月和24个月随访时制备乙烯基聚硅氧烷印模。使用石膏复制品和3D激光扫描装置测量牙冠、其天然拮抗剂和两个对侧天然拮抗剂（对照牙）的咬合接触区的磨损。氧化锆冠拮抗剂和对照牙齿之间的磨损差异进行了研究，通过双侧配对学生的t检验和线性回归分析。2年后，平均垂直损失为46 μ m的釉质对氧化锆，19-26 μ m的对侧控制牙齿和14 μ m的氧化锆冠。最大垂直损失为151 μ m的釉质相对氧化锆，75-115 μ m的控制牙齿和60 μ m的氧化锆冠。统计分析显示，氧化锆对牙齿和对照牙齿的釉质磨损之间存在显着差异。性别，这显着影响磨损，被确定为可能的混杂因素。整体式氧化锆冠产生更多的磨损，反对釉质比天然牙齿。由于其他牙科陶瓷引起的磨损更大，因此使用整体氧化锆冠可能是合理的。
The purpose of this study was to measure enamel wear caused by antagonistic monolithic zirconia crowns and to compare this with enamel wear caused by contralateral natural antagonists. Twenty monolithic zirconia full molar crowns were placed in 20 patients. Patients with high activity of the masseter muscle at night (bruxism) were excluded. For analysis of wear, vinylpolysiloxane impressions were prepared after crown incorporation and at 6-, 12-, and 24-month follow-up. Wear of the occlusal contact areas of the crowns, of their natural antagonists, and of two contralateral natural antagonists (control teeth) was measured by use of plaster replicas and a 3D laser-scanning device. Differences of wear between the zirconia crown antagonists and the control teeth were investigated by means of two-sided paired Student's t-tests and linear regression analysis. After 2 years, mean vertical loss was 46 mu m for enamel opposed to zirconia, 19-26 mu m for contralateral control teeth and 14 mu m for zirconia crowns. Maximum vertical loss was 151 mu m for enamel opposed to zirconia, 75-115 mu m for control teeth and 60 mu m for zirconia crowns. Statistical analysis revealed significant differences between wear of enamel by zirconia-opposed teeth and by control teeth. Gender, which significantly affected wear, was identified as a possible confounder. Monolithic zirconia crowns generated more wear of opposed enamel than did natural teeth. Because of the greater wear caused by other dental ceramics, the use of monolithic zirconia crowns may be justified.