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Effect of different fabrication methods of occlusal devices on periradicular stress distribution: A photoelastic analysis
The Journal of Prosthetic Dentistry ( IF 4.6 ) Pub Date : 2021-07-31 , DOI: 10.1016/j.prosdent.2021.06.037
Luciana Paula Benício Arcas 1 , Kusai Baroudi 2 , Laís Regiane Silva-Concílio 2 , Cristiane Aparecida de Assis Claro 2 , Marina Amaral 2
Affiliation  

Statement of problem

Investigations on the effectiveness of new methods for optimizing the fabrication of oral devices are lacking.

Purpose

The purpose of this in vitro study was to evaluate stress distribution with photoelastic analysis in the periradicular area of teeth supporting occlusal devices fabricated by 5 different processes.

Material and methods

The occlusal devices were fabricated by vacuum thermoforming, heat-polymerized acrylic resin, chemical polymerized acrylic resin, 3-dimensional printing, and milling (computer-aided manufacturing). The devices were evaluated regarding initial fit, number of adjustments for passive fit, and stress distribution under 100-N and 400-N loads in the periradicular locations of posterior teeth.

Results

The 3-dimensional printing device did not require any adjustment for initial adaptation to the photoelastic model and presented a little friction with the model. The heat-polymerized acrylic resin device did not seat initially, requiring more sites of adjustment until passive adaptation. At 100-N and 400-N loads, the use of the computer-aided manufacturing occlusal device resulted in the lowest stresses in periradicular areas (0.744 and 1.583, respectively), and the 3-dimensional printing occlusal device produced the highest stresses with a 400-N load application (2.427). The lowest mean of fringe pattern was observed for the computer-aided manufacturing device, and the highest mean of fringe pattern was observed for the vacuum thermoforming device.

Conclusions

The computer-aided design and computer-aided manufacturing milled occlusal device presented the best initial adaptation and transferred lower stresses to the periradicular areas than the other evaluated devices.



中文翻译:

不同咬合装置制造方法对根尖应力分布的影响:光弹性分析

问题陈述

缺乏对优化口腔器械制造新方法有效性的研究。

目的

这项体外研究的目的是通过光弹性分析评估由 5 种不同工艺制造的牙齿支撑咬合装置的根周区域的应力分布。

材料与方法

咬合装置采用真空热成型、热聚合丙烯酸树脂、化学聚合丙烯酸树脂、3 维打印和铣削(计算机辅助制造)制造。对装置的初始贴合度、被动贴合调整次数以及后牙根尖周围位置 100-N 和 400-N 载荷下的应力分布进行了评估。

结果

3维打印装置初始适应光弹模型不需要任何调整,与模型存在轻微摩擦。热聚合丙烯酸树脂装置最初没有就位,需要更多的调整位置,直到被动适应。在 100-N 和 400-N 负载下,使用计算机辅助制造咬合装置在根尖周围区域产生的应力最低(分别为 0.744 和 1.583),而 3 维打印咬合装置产生的应力最高, 400-N 负载应用 (2.427)。计算机辅助制造设备的条纹图案平均值最低,而真空热成型设备的条纹图案平均值最高。

结论

与其他评估装置相比,计算机辅助设计和计算机辅助制造铣削咬合装置呈现出最佳的初始适应性,并将较低的应力转移到根尖周围区域。

更新日期:2021-07-31
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