Int J Prosthodont. 2012 Nov-Dec;25(6):604-12.
This study aimed to investigate the clinical outcome and estimated cumulative survival rate of feldspathic porcelain veneers in situ for up to 21 years while also accounting for clustered outcomes.
Porcelain veneers(n = 499) placed in patients (n = 155) by a single prosthodontist between 1990 and 2010 were sequentially included, with 239 veneers (88 patients) placed before 2001 and 260 veneers (67 patients) placed thereafter. Nonvital teeth, molar teeth, or teeth with an unfavorable periodontal prognosis were excluded. Preparations had chamfer margins, incisal reduction, palatal overlap, and at least 80% enamel. Feldspathic veneers from refractory dies were etched (hydrofluoric acid), silanated, and bonded. Many patients received more than 1 veneer (mean: 5.8 ± 4.3). Clustered outcomes were accounted for by randomly selecting (random table) 1 veneer per patient for analysis. Clinical outcome (success, survival, unknown, dead, repair, failure) and Kaplan-Meier estimated cumulative survival were reported. Differences in survival were analyzed using the log-rank test.
For the random sample of veneers (n = 155), the estimated cumulative survival rates were 96% ± 2% (10 years) and 96% ± 2% (20 years). For the entire sample, the survival rates were 96% ± 1% (10 years) and 91% ± 2% (20 years). Survival did not statistically differ between these groups (P = .65). Seventeen veneers in 8 patients failed, 75 veneers in 30 patients were classified as unknown, and 407 veneers in 130 patients survived. Multiple veneers in the same mouth experienced the same outcome, clustering the results.
Multiple dental prostheses in the same mouth are exposed to the same local and systemic factors, resulting in clustered outcomes. Clustered outcomes should be accounted for during analysis. When bonded to prepared enamel substrate, feldspathic porcelain veneers have excellent long-term survival with a low failure rate. The 21-year estimated cumulative survival for feldspathic porcelain veneers bonded to prepared enamel was 96% ± 2%.
本研究旨在调查长达 21 年的现场长石质烤瓷贴面的临床效果和估计累积存活率，同时考虑到聚类结果。
自 1990 年至 2010 年，由一名口腔修复医生连续纳入 155 名患者（n=499）的瓷贴面（n=499），其中 239 个贴面（88 名患者）于 2001 年之前放置，260 个贴面（67 名患者）之后放置。排除非活髓牙、磨牙或牙周预后不良的牙齿。预备体有斜面边缘、切端预备、腭侧覆盖，且至少有 80%的釉质。长石质贴面由耐火模具制成，经氢氟酸蚀刻、硅烷化和粘结。许多患者接受了不止 1 个贴面（平均：5.8±4.3）。通过随机（随机表）选择每个患者的 1 个贴面进行分析来考虑聚类结果。报告临床结果（成功、存活、未知、死亡、修复、失败）和 Kaplan-Meier 估计的累积存活率。使用对数秩检验分析生存差异。
对于随机样本的贴面（n=155），估计的累积存活率为 96%±2%（10 年）和 96%±2%（20 年）。对于整个样本，存活率为 96%±1%（10 年）和 91%±2%（20 年）。两组间的生存率无统计学差异（P=0.65）。8 名患者的 17 个贴面失败，30 名患者的 75 个贴面被归类为未知，130 名患者的 407 个贴面存活。同一口中的多个贴面经历了相同的结果，聚类了结果。
同一口中的多个牙修复体暴露于相同的局部和全身因素，导致聚类结果。在分析中应考虑聚类结果。当粘结到预备的牙釉质基底上时，长石质烤瓷贴面具有出色的长期存活率和较低的失败率。粘结到预备牙釉质的长石质烤瓷贴面的 21 年估计累积存活率为 96%±2%。
