García-Gil Ignacio, Perez de la Calle Celia, Lopez-Suarez Carlos, Pontevedra Paula, Suarez Maria J
DDS, MS. Student, Master Program Buccofacial Prostheses and Occlusion, Faculty of Dentistry, University Complutense of Madrid, Madrid, Spain.
DDS. Student, Master Program Buccofacial Prostheses and Occlusion, Faculty of Dentistry, University Complutense of Madrid, Madrid, Spain.
J Clin Exp Dent. 2020 Sep 1;12(9):e896-e901. doi: 10.4317/jced.56967. eCollection 2020 Sep.
Biologically oriented preparation technique (BOPT) is a vertical preparation technique without a finish line to create a new anatomic crown with a prosthetic emergence profile. This case report describe the protocol realized digitally in a patient who required a new fixed partial denture (FPD) in the anterior esthetic zone. After time of temporary restoration, definitive conventional (CI) (double-cord retraction and vinyl polysiloxane material), and digital impression (DI) with three different intraoral scanner (IOS) (Trios®, True Definition® and iTero®) were taken. All digital impression were obtained through three different scans: temporary restoration in the mouth after healing period, prepared teeth, and temporary restoration out of the mouth. To establish which of the IOS was the most accurate, it was necessary to compare the STL files obtained from each of the IOS with the STL file of the conventional impression, which was digitized with a laboratory scanner (3Shape D800). All these STL were imported to a software (ExoCAD 2.4 Plovdiv®), and they were superimposed. To establish the difference in trueness with SC, 6 points were chosen, 3 points in teeth, and another 3 points in soft tissue. The mean measurement in terms of trueness in teeth were: STS (0,039 mm), SI (0,054 mm), STD (0,067 mm); and in soft tissue were: STS (0,051 mm), SI (0,09 mm), STD [0,236 mm]. The IOSs showed differences between them in terms of trueness, being the Trios the most accuracy IOS. Final restoration was fabricated and cemented. The patient was examined at 3, 6 and 12 months, without any type of biological or mechanical complications. Digital impression with an IOS seems to be a viable alternative to perform zirconia FPD in the BOPT tecbique. Intraoral scanners, accuracy, vertical preparation, precision, CAD-CAM, prosthodontics.
生物导向性预备技术（BOPT）是一种无肩台的垂直预备技术，用于创建具有修复体边缘形态的新解剖牙冠。本病例报告描述了在一名需要在前牙美学区制作新的固定局部义齿（FPD）的患者中以数字方式实现的方案。在临时修复一段时间后，采用了传统印模法（CI）（双绳缩龈和乙烯基聚硅氧烷材料）以及使用三种不同口腔内扫描仪（IOS）（Trios®、True Definition®和iTero®）进行数字印模（DI）。所有数字印模均通过三种不同扫描获得：愈合期后口腔内的临时修复体、预备牙以及口腔外的临时修复体。为确定哪种IOS最准确，有必要将从每个IOS获得的STL文件与用实验室扫描仪（3Shape D800）数字化的传统印模的STL文件进行比较。所有这些STL文件都导入到一个软件（ExoCAD 2.4 Plovdiv®）中，并进行叠加。为确定与传统印模在准确性上的差异，选择了6个点，牙齿上3个点，软组织上另外3个点。牙齿准确性方面的平均测量值为：Trios（0.039毫米）、True Definition（0.054毫米）、iTero（0.067毫米）；软组织方面的平均测量值为：Trios（0.051毫米）、True Definition（0.09毫米）、iTero（0.236毫米）。IOS在准确性方面存在差异，Trios是最准确的IOS。最终修复体制作完成并粘结。在3个月、6个月和12个月时对患者进行检查，未出现任何生物或机械并发症。在BOPT技术中，使用IOS进行数字印模似乎是制作氧化锆FPD的可行替代方法。口腔内扫描仪、准确性、垂直预备、精度、CAD - CAM、口腔修复学。
