Milled versus moulded mock-ups based on the superimposition of 3D meshes from digital oral impressions: a comparative in vitro study in the aesthetic area
Milled versus moulded mock-ups based on the superimposition of 3D meshes from digital oral impressions: a comparative in vitro study in the aesthetic area
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DOI：
10.1186/s12903-019-0922-2
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发表时间：
2019-10-29
期刊：
影响因子：
2.9
通讯作者：
Cappare, Paolo
中科院分区：
文献类型：
--
作者：
Cattoni, Francesca;Tete, Giulia;Cappare, Paolo
背景：美学瓷贴面被证明是一个长期可靠的修复解决方案，确保最小的侵入性。贴面的使用需要粘合剂粘结技术，因此保持尽可能多的釉质是为了确保持久的成功。诊断模型是一个关键工具，可以预览美学修复的结果：它可以以模拟和数字方式获得。随着印模技术的最新发展和CAD-CAM技术的快速发展，了解这两种技术的优缺点是非常有用的（模拟和数字），以确定更容易和更方便的工作流程，在美容牙科。方法：在对需要美容康复的患者的牙弧进行拍照和印模后，制作了52个树脂模型，并绘制了微笑的数字图。从52个模型中的两个模型中获得了模拟和数字蜡像：后者是使用数字印模和专用软件获得的。然后使用模拟上蜡来生产25个基质，这些基质随后使用传统的模制方案（对照组- CG）来模制25个树脂实体模型。使用数字上蜡机研磨25个PMMA模型。每个实体模型，无论是铣削和成型（共50），然后奠定了其他50个树脂模型，因为它的数字印象。STL。将研磨模型的文件与使用特定软件制成的3DCAD蜡模进行比较。STL。将模拟印刷模型的文件与传统的蜡模设计进行比较。结果：经统计学分析，两组重叠STL点间距离的平均值有显著性差异（P > 0.01）。GC（0.0468 mm）和TG（试验组- TG）（0.0109 mm）中的补片。结论：该研究表明，与原始蜡模相比，传统模制和研磨模型之间的准确度存在差异。数据分析报告说，数字方法允许更高的准确性。在本研究的限制范围内，在创建美学模型时，全数字化工作流程被认为更可靠：数字程序已被证明比手动程序更准确，手动程序更依赖于操作员，并且会增加错误的机会，最终可能影响最终结果。
Background: Aesthetic porcelain veneers proved to be a long-term reliable prosthetic solution, ensuring minimal invasiveness. The use of veneers requires an adhesive cementation technique, so maintaining as much enamel as possible is to ensure lasting success. A diagnostic mock-up is a key tool that allows a preview of the outcome of the aesthetic restoration: it is obtainable both in an analog and digital way. With the recent developments in impression technology and the ever so fast growing use of CAD-CAM technologies it is useful to understand the pros and cons of either one of these techniques (analog and digital) in order to identify the easier and more convenient workflow in aesthetic dentistry.Methods: After taking pictures and impressions of the dental arcs of a patient in need of aesthetic rehabilitation, 52 resin models were produced and a digital drawing of the smile was outlined. Both an analog and a digital wax-up were obtained from two of the 52 models: the latter was obtained using digital impressions and a dedicated software. The analog wax-up was then used to produce 25 matrices that have later been used to mould 25 resin mock-ups using a traditional moulding protocol (Control Group - CG). The digital wax-up was used to mill 25 PMMA mock-ups. Each mock-up, both milled and moulded (total 50), was then laid on the other 50 resin models as a digital impression of it was taken. The STL. files of the milled mock-ups were compared with the 3D CAD wax-up made using a specific software. The STL. files of the analog printed mock-ups were compared with the traditional wax-up design. A statistical analysis was carried out to evaluate the difference between the groups.Results: The statistical analysis showed a significant difference (P > 0.01) between the mean value of the distance between the points of the overlapping STL. meshes in GC (0.0468 mm) and in TG (Test Group - TG) (0,0109 mm).Conclusions: The study showed a difference in accuracy between traditional moulded and milled mock-ups compared to their original wax-up. The data analysis reports that the digital method allows for greater accuracy. Within the limitations of this study, a fully digital workflow is to considered more reliable when it come to creating an esthetic mockup: the digital procedure has been shown to be more accurate than the one made manually which is much more operator dependent and it brings an increase to the chance of error, and that could ultimately affect the final result.