Meijering A C, Peters M C, DeLong R, Pintado M R, Creugers N H
Department of Occlusal Reconstruction and Oral Function, University of Nijmegen, The Netherlands.
J Dent. 1998 Sep;26(7):569-76. doi: 10.1016/s0300-5712(97)00038-9.
The aim of the study was to determine the dimensional changes of teeth when veneering procedures are involved.
Fifteen discoloured central incisors were selected from a group of 180 veneer restorations (VRs) composed of three different types of materials (direct resin composite, indirect resin composite and porcelain). Impressions and dies were made before treatment, after preparation and after placement and finishing the restoration. Contact stylus profilometry and subsequent analysis of the 3-D surface images provided quantitative data of the differences between the various treatment phases.
The preparation reduction was the most for indirect resin composite VRs and the least for direct resin composite VRs. All veneer restorations showed nearly the same thickness and dimensional change after treatment, except one, which resulted in an additional increase of volume of the tooth.
From the results of this study it is concluded that the dimensions of a discoloured tooth treated with a veneer restoration unintentionally increased, resulting in overcontour.
本研究的目的是确定涉及贴面修复程序时牙齿的尺寸变化。
从由三种不同材料（直接树脂复合材料、间接树脂复合材料和瓷）组成的180个贴面修复体（VR）组中选择15颗变色的中切牙。在治疗前、预备后以及修复体就位和完成后制取印模和模型。接触式触针轮廓仪和随后对三维表面图像的分析提供了不同治疗阶段之间差异的定量数据。
间接树脂复合材料VR的预备量最大，直接树脂复合材料VR的预备量最小。除一个修复体导致牙齿体积额外增加外，所有贴面修复体在治疗后均显示出几乎相同的厚度和尺寸变化。
从本研究结果得出结论，用贴面修复治疗的变色牙齿尺寸意外增加，导致外形轮廓过高。
