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首页> 外文期刊>The Journal of Prosthetic Dentistry >Tooth structure removal associated with various preparation designs for anterior teeth.
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Tooth structure removal associated with various preparation designs for anterior teeth.

机译：与前牙的各种准备设计相关的牙齿结构去除。

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Statement of Problem. The conservation of sound tooth structure helps preserve tooth vitality and reduce postoperative sensitivity. Innovative preparation designs, like those for porcelain laminate veneers, are much less invasive than conventional complete-coverage crown preparations. However, no study has quantified the amount of tooth structure removed during these preparations. Purpose. The purpose of this study was to quantify and compare the amount of tooth structure removed when various innovative and conventional tooth preparation designs were completed on different teeth. Material and Methods. A new comprehensive tooth preparation design classification system was introduced. Typodont resin teeth representing the maxillary left central incisor, maxillary left canine, and mandibular left central incisor were prepared with the following designs: partial (V1), traditional (V2), extended (V3), and complete (V4) porcelain laminate veneer preparations; resin-bonded retainer preparation with grooves (A1) and with wing/grooves (A2); all-ceramic crown preparation with 0.8 mm axial reduction and tapering chamfer finish line (F1), all-ceramic crown preparation with 1.0 mm axial reduction and rounded shoulder finish line (F2), and metal-ceramic crown with 1.4 mm axial reduction and facial shoulder finish line (F3). After tooth preparations (10 per group), the crown was separated from the root at the CEJ. The removed coronal tooth structure was measured with gravimetric analysis. Means and standard deviations for tooth structure removal with different preparation designs were calculated and analyzed with analysis of variance at a significance level of P<.05. Results. Significant differences in the amount of tooth structure removal were noted between preparation designs. Ceramic veneers and resin-bonded prosthesis retainers were the least invasive preparation designs, removing approximately 3% to 30% of the coronal tooth structure by weight. Approximately 63% to 72% of the coronal tooth structure was removed when teeth were prepared for all-ceramic and metal-ceramic crowns. For a single crown restoration, the tooth structure removal required for an F3 preparation (metal-ceramic crown) was 4.3 times greater than for a V2 preparation (porcelain laminate veneer, facial surface only) and 2.4 times greater than for a V4 preparation (more extensive porcelain laminate veneer). Conclusion. Within the limitations of this study, tooth preparations for porcelain laminate veneers and resin-bonded prostheses required approximately one-quarter to one-half the amount of tooth reduction of conventional complete-coverage crowns.
机译：问题陈述。保持良好的牙齿结构有助于保持牙齿活力并降低术后敏感性。与传统的全覆盖式冠冠制备相比，创新性的制备设计（如瓷贴面贴面设计）具有更小的侵入性。但是，尚无研究量化这些准备过程中去除的牙齿结构的数量。目的。这项研究的目的是量化和比较在不同的牙齿上完成各种创新和常规的牙齿准备设计时去除的牙齿结构量。材料与方法。引入了一种新的综合牙齿准备设计分类系统。使用以下设计制备代表上颌左中切牙，上颌左犬齿和下颌左中切牙的台齿树脂牙：部分（V1），传统（V2），扩展（V3）和完整（V4）烤瓷贴面饰板制备;具有凹槽（A1）和机翼/凹槽（A2）的树脂结合的固定器准备;全瓷冠制备，轴向缩小0.8 mm，倒角终点线逐渐变细（F1），全瓷冠制备，轴向缩小1.0 mm，肩部终点线呈圆角（F2），金属瓷冠，轴向缩小1.4 mm，且面部肩膀终点线（F3）。准备好牙齿后（每组10个），在CEJ处将牙冠与牙根分开。用重量分析法测量去除的冠状牙齿结构。计算了不同准备设计下的牙齿结构去除的均值和标准差，并通过显着性水平P <.05的方差分析进行了分析。结果。在准备设计之间注意到牙齿结构去除量的显着差异。陶瓷贴面和树脂粘结的假体固定器是侵入性最低的制备设计，按重量去除了约3％至30％的冠状牙齿结构。当准备用于全陶瓷和金属陶瓷牙冠的牙齿时，约63％至72％的冠状牙齿结构被去除。对于单冠修复，F3制剂（金属陶瓷冠）所需的牙齿结构去除量比V2制剂（瓷层压板饰面，仅面部表面）大4.3倍，比V4制剂大2.4倍（更多）广泛的瓷层压板）。结论。在这项研究的局限性内，用于瓷层压板和树脂粘合假体的牙齿准备工作所需的牙齿减少量约为传统全覆盖式牙冠的减少量的四分之一到二分之一。

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