Haselton D R, Diaz-Arnold A M, Hillis S L
University of Iowa, College of Dentistry, Iowa City, Iowa 52242, USA.
J Prosthet Dent. 2000 Apr;83(4):396-401. doi: 10.1016/s0022-3913(00)70033-3.
All-ceramic crowns are being used extensively. Little data are available on their clinical performance.
This study evaluated the clinical performance of In-Ceram (Vita Zahnfabrik) crowns.
Forty-one patients (16 men, 25 women; mean age 47.3 years, range 18 to 77 years) were examined with a total of 80 In-Ceram all-ceramic crowns fabricated at the University of Iowa College of Dentistry from 1994 to 1997. The percentage distribution for crowns included: 67% anterior single crowns, 26% posterior single crowns, 6% anterior implant crowns, and 1% posterior implant crowns. This study documented the integrity of the junction between crown and tooth, color match to adjacent teeth, secondary dental caries, wear of crown and opposing dentition, and visible cracks in the crown. Alpha, Bravo, and Charlie ratings were assigned with a modified USPHS criteria. The patients were also surveyed with respect to oral hygiene and satisfaction of treatment. Estimations of 4-year success rates and corresponding confidence intervals were calculated by fitting a constant hazard function model with the SAS procedure GENMOD.
Marginal integrity for 88% of artificial crowns was rated Alpha or Bravo. Shade match for 99% was Bravo or better. Only 1% of the crowns were carious, and 1 crown exhibited occlusal wear. One premolar crown had a small fracture of veneering porcelain. One molar crown was remade after core fracture. All patients (100%) expressed satisfaction with their crowns. The estimated 4-year success rates (Alpha or Bravo), with 95% confidence intervals in parentheses were calculated as: 83.5% (65.7%-94.6%) for marginal integrity, 95.8% (82.9%-99.8%) for shade match, and 95.5% (81.6%-99.7%) for secondary caries, 100% (88%-100%) for wear, and 100% (88%-100%) for cracks.
全瓷冠正被广泛使用。关于其临床性能的数据很少。
本研究评估了In-Ceram（维他齿科）全瓷冠的临床性能。
对41例患者（16名男性，25名女性；平均年龄47.3岁，范围18至77岁）进行了检查，这些患者共有80颗于1994年至1997年在爱荷华大学牙科学院制作的In-Ceram全瓷冠。冠的百分比分布包括：67%为前牙单冠，26%为后牙单冠，6%为前牙种植体冠，1%为后牙种植体冠。本研究记录了冠与牙之间结合处的完整性、与相邻牙齿的颜色匹配度、继发龋、冠和对颌牙列的磨损以及冠上可见的裂纹。采用改良的美国公共卫生署标准进行Alpha、Bravo和Charlie评级。还对患者的口腔卫生和治疗满意度进行了调查。通过使用SAS程序GENMOD拟合恒定风险函数模型来计算4年成功率及相应的置信区间。
88%的人造冠边缘完整性被评为Alpha或Bravo。99%的颜色匹配度为Bravo或更好。只有1%的冠发生龋坏，1颗冠出现咬合磨损。1颗前磨牙冠的饰面瓷有小的骨折。1颗磨牙冠在核骨折后进行了重新制作。所有患者（100%）对其冠表示满意。计算得出的4年成功率（Alpha或Bravo）及95%置信区间如下：边缘完整性为83.5%（65.7%-94.6%），颜色匹配度为95.8%（82.9%-99.8%），继发龋为95.5%（81.6%-99.7%），磨损为100%（88%-100%），裂纹为100%（88%-100%）。
