A practice-based clinical evaluation of the survival and success of metal-ceramic and zirconia molar crowns: 5-year results
A practice-based clinical evaluation of the survival and success of metal-ceramic and zirconia molar crowns: 5-year results
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DOI：
10.1111/joor.12348
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发表时间：
2016-02-01
影响因子：
2.9
通讯作者：
Roediger, M.
中科院分区：
文献类型：
--
作者：
Rinke, S.;Kramer, K.;Roediger, M.
本研究以实践为基础，通过延长贴面瓷的冷却时间来评估传统金属陶瓷和氧化锆磨牙冠的生存和成功。从2008年7月至2009年7月，53例患者采用金属-陶瓷冠（MCC）或氧化锆冠（ZC）治疗。45例患者（女性26例）91个修复体（观察期640 +/- 48个月）参加临床随访检查，纳入研究。计算累积生存期（ECSv）、成功（ECSc）和贴面陶瓷成功（ECVCSc） （Kaplan-Meier），并通过冠制作技术和修复体位置（Cox回归模型）进行分析（P < 005）。5年ECSv: MCC: 976%， 95%可信区间（95%- ci）： [93%；[100%]/ zc: 940%, (95%-ci): [87%；100%)。在mcc （n = 41）中，850% [95%-CI:(77%; 96%)]保持无事件，而ZCs （n = 50）的ECSc为743% (95%-CI): [61%；87%)。两种制备方法在ECSv （P = 051）、ECSc （P = 043）和ECVCSc （P = 036）方面均无显著差异。放置在末端基牙上的修复体（n = 44）的ECVCSc（5年vcf率：148%）明显低于放置在牙邻基牙上的冠体（n = 47）（5年vcf率：43%）。在本研究中，氧化锆磨牙冠的5年ECSv、ECSc和ECVCSc与mcc相当。无论采用何种制作技术，末端基牙上的冠都明显增加了vcf的风险。临床调查需要增加修复的数量。
This practice-based study evaluates the survival and success of conventionally luted metal-ceramic and zirconia molar crowns fabricated by using a prolonged cooling period for the veneering porcelain. Fifty-three patients were treated from 07/2008 to 07/2009 with either metal-ceramic crowns (MCC) or zirconia crowns (ZC). Forty-five patients (26 female) with 91 restorations (obser-vational period: 640 +/- 48 months) participated in a clinical follow-up examination and were included in the study. Estimated cumulative survival (ECSv), success (ECSc) and veneering ceramic success (ECVCSc) were calculated (Kaplan-Meier) and analysed by the crown fabrication technique and the position of the restoration (Cox regression model) (P < 005). Five complete failures (MCC: 2, ZC: 3) were recorded (5-year ECSv: MCC: 976%, (95% confidence interval (95%-CI): [93%; 100%]/ZC: 940%, (95%-CI): [87%; 100%]). Of the MCCs (n = 41), 850%, [95%-CI: (77%; 96%)] remained event-free, whereas the ECSc for the ZCs (n = 50) was 743% (95%-CI): [61%; 87%]. No significant differences in ECSv (P = 051), ECSc (P = 043) and ECVCSc (P = 036) were detected between the two fabrication techniques. Restorations placed on terminal abutments (n = 44) demonstrated a significantly lower ECVCSc (P = 0035), (5-year VCF-rate: 148%) than crowns placed on tooth-neighboured abutments (n = 47), (5-year VCF-rate: 43%). In the present study, zirconia molar crowns demonstrated a 5-year ECSv, ECSc and ECVCSc comparable to MCCs. Irrespective of the fabrication technique, crowns on terminal abutments bear a significantly increased risk for VCFs. Clinical investigations with an increased number of restorations are needed.