Department of Prosthodontics, M.A. Rangoonwala College of Dental Sciences and Research Centre, Pune, India.
Department of Oral Pathology, D.Y. Patil School of Dentistry, Pimpri, Pune, India.
J Prosthodont. 2019 Jan;28(1):e411-e416. doi: 10.1111/jopr.12960. Epub 2018 Sep 26.
To assess the clinical performance and survival of full-contour monolithic zirconia (MZ) crowns and enamel wear produced over a 1-year period.
60 patients requiring full-coverage restorations for endodontically treated posterior teeth opposed by healthy unrestored antagonistic teeth were selected. MZ crowns were fabricated. Vinyl polysiloxane impressions of the antagonist teeth were made, and the stone casts were digitized using a 3D laser scanner. Wear of the opposing natural teeth was evaluated at baseline (1 week), 6 months, and 1 year after crown cementation. Superimposition of the follow-up scans on the baseline scans were performed to evaluate wear. Survival and function of the restorations were evaluated by the modified USPHS rating criteria at the same timeframes.
Comparison of the baseline and the follow-up wear values was statistically tested using the paired t-test. Statistical significance was noted between the wear values at 6 months (15.5 μm) and at 12 months (16.3 μm) (p < 0.05). The Wilcoxon signed rank sum test was performed to evaluate each parameter of the modified USPHS criteria and to analyze the change in the follow-up scores of the restorations. The survival rate for the crowns was 100%. Results were classified as "excellent" over a 1-year follow up.
MZ crowns showed promising results related to antagonist enamel wear and survival/clinical performance.
评估全瓷整体氧化锆（MZ）冠的临床性能和 1 年的存活率，以及在此期间产生的牙釉质磨损情况。
选择 60 名需要对牙髓治疗后的后牙进行全冠修复的患者，这些后牙的对颌牙为健康、未经修复的天然牙。制作 MZ 冠。用乙烯基聚硅氧烷对天然牙的对颌牙进行印模，并使用三维激光扫描仪对石质模型进行数字化。在冠粘固后 1 周、6 个月和 1 年时评估对颌天然牙的磨损情况。通过将随访扫描与基线扫描进行叠加来评估磨损情况。同时，根据改良美国公共卫生服务标准对修复体的存活率和功能进行评估。
使用配对 t 检验对基线和随访磨损值进行了统计学比较。在 6 个月（15.5μm）和 12 个月（16.3μm）时的磨损值之间存在统计学差异（p<0.05）。采用 Wilcoxon 符号秩和检验评估改良美国公共卫生服务标准的每个参数，并分析修复体随访评分的变化。冠的存活率为 100%。在 1 年的随访中，结果被归类为“优秀”。
MZ 冠在对抗牙釉质磨损以及存活率/临床性能方面表现出良好的结果。
