Simon Jacob C, Choi Jee Hye, Jang Andrew, Fried Daniel
University of California, San Francisco, San Francisco, CA 94143-0758.
Proc SPIE Int Soc Opt Eng. 2020 Feb;11217. doi: 10.1117/12.2550985. Epub 2020 Feb 19.
Dental composites are used as restorative materials to replace tooth structure after the removal of caries, shaping, covering teeth for esthetic purposes and as adhesives. Dentists spend more time replacing existing restorations that fail than they do placing new restorations. Tooth colored restorations are difficult to differentiate from the surrounding tooth structure making them challenging to remove completely without incidental removal of healthy tooth structure. Previous studies have demonstrated that CO lasers in conjunction with spectral feedback can be used to selectively remove composite from tooth surfaces. In addition, we assembled a system feasible for clinical use that incorporates a spectral feedback system, scanning system, articulating arm and a clinical handpiece and subsequently evaluated the performance of that system on extracted teeth. The purpose of this study was to test this system to demonstrate its efficacy relative to dental clinicians. Eight test subjects with premolar teeth scheduled for extraction for orthodontic reasons had bilateral premolars prepared with small occlusal cavity preparations and filled with dental composite. The laser scanning system was used to remove the composite from one of the preparations and a dental handpiece was used to remove the composite from the other. Cross polarization optical coherence tomography was used to measure the volume of the preparation before and after composite placement and removal. There was no significant difference in the loss of enamel and residual composite between the laser and the handpiece. This study demonstrated that a computer controlled spectral guided CO laser scanning system can be used to selectively remove composite from tooth surfaces.
牙科复合材料用作修复材料，用于在去除龋齿后替换牙体组织、塑形、出于美观目的覆盖牙齿以及作为粘合剂。与放置新的修复体相比，牙医花费更多时间替换失败的现有修复体。牙齿颜色的修复体很难与周围的牙体组织区分开来，这使得在不意外去除健康牙体组织的情况下将其完全去除具有挑战性。先前的研究表明，结合光谱反馈的CO激光可用于选择性地从牙齿表面去除复合材料。此外，我们组装了一个适用于临床的系统，该系统包括光谱反馈系统、扫描系统、关节臂和临床手持件，随后在拔除的牙齿上评估了该系统的性能。本研究的目的是测试该系统，以证明其相对于牙科临床医生的疗效。八名因正畸原因计划拔除前磨牙的受试者，其双侧前磨牙制备了小的咬合面洞形并填充牙科复合材料。使用激光扫描系统从其中一个制备物中去除复合材料，使用牙科手持件从另一个制备物中去除复合材料。交叉偏振光学相干断层扫描用于测量复合材料放置和去除前后制备物的体积。激光和手持件在牙釉质损失和残留复合材料方面没有显著差异。本研究表明，计算机控制的光谱引导CO激光扫描系统可用于选择性地从牙齿表面去除复合材料。
