Evaluation of thickness of 3D printed versus thermoformed aligners: A prospective in vivo ageing experiment

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS ACS Applied Bio Materials Pub Date : 2024-06-11 DOI:10.1111/ocr.12822

Babak Sayahpour, Sara Eslami, Jakob Stuhlfelder, Sarah Bühling, Iulia Dahmer, Malcolm Goteni, Stefan Kopp, Ludovica Nucci

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Abstract

Background

To compare and investigate the effects of intraoral ageing on the thickness of one group of directly printed and two groups of thermoformed aligners on the labial surface of maxillary central incisors.

Materials and Methods

Six groups (12 samples per group) were included in this prospective in vivo experiment. Groups DP-Clin, INV-Clin and CA-Clin consisted of directly printed (Tera Harz TC-85 DAC resin), thermoformed (Invisalign, PU based polymer) and in house thermoformed (CA-Pro, PET-G based polymer) aligners, retrieved after 1 week of intraoral service. Groups DP-Ctr, INV-Ctr and CA-Ctr included unused aligners samples. Thickness measurements were conducted using confocal laser scanning microscopy (CLSM). Data that underwent log-10 transformation was analysed by multiple linear regression analysis (p < .05).

Results

Statistically significant differences were found between the materials in both Clin and Ctr categories (p < .001). Group DP had the highest thickness among the groups and the least thickness was observed in the CA group (p < .001). However, intraoral ageing did not significantly affect the aligner thickness of any groups.

Conclusions

Both thermoforming and direct printing of clear aligners led to thickness deviations in terms of increase for printed aligners and decrease for thermoformed aligners. Intraoral ageing did not affect the aligner thickness in any of the groups.

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评估 3D 打印与热成型矫治器的厚度：前瞻性体内老化实验。

背景：比较并研究口内老化对上颌中切牙唇面一组直接印制和两组热成型矫治器厚度的影响：本前瞻性活体实验包括六组（每组 12 个样本）。DP-Clin组、INV-Clin组和CA-Clin组包括直接印模（Tera Harz TC-85 DAC树脂）、热成型（Invisalign，聚氨酯聚合物）和室内热成型（CA-Pro，PET-G聚合物）矫治器，在口内使用1周后取回。DP-Ctr、INV-Ctr和CA-Ctr组包括未使用过的矫治器样本。厚度测量采用共焦激光扫描显微镜（CLSM）进行。对经过对数-10 转换的数据进行了多元线性回归分析（P 结果：在 Clin 和 Ctr 两个类别中，材料之间存在明显的统计学差异（p 结论：热成型和直接打印的矫治器厚度测量结果一致：热成型和直接印制透明矫治器都会导致厚度偏差，印制矫治器的厚度增加，而热成型矫治器的厚度减少。口内老化不影响任何一组的矫治器厚度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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