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.
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.
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.
摘要：
背景：比较和研究口腔内老化对一组直接打印和两组热成型对准器在上颌中切牙唇表面厚度的影响。
方法:该前瞻性体内实验包括6组(每组12个样品)。组DP-Clin,INV-Clin和CA-Clin由直接印刷（TeraHarzTC-85DAC树脂）组成，热成型(Invisalign，PU基聚合物)和室内热成型(CA-Pro，PET-G基聚合物)矫正器，在口腔内服务1周后检索。组DP-Ctr,INV-Ctr和CA-Ctr包括未使用的对准器样品。使用共聚焦激光扫描显微镜(CLSM)进行厚度测量。通过多元线性回归分析(p<.05)分析经过log-10转化的数据。
结果：在Clin和Ctr类别的材料之间发现了统计学上的显着差异（p<.001）。DP组在各组中具有最高的厚度,并且在CA组中观察到最小的厚度(p〈.001)。然而,口内老化对任何组的矫正器厚度均无显著影响.
结论：透明矫正器的热成型和直接印刷均导致厚度偏差，即印刷矫正器的厚度增加和热成型矫正器的厚度减少。口腔内老化不影响任何组中的矫正器厚度。
方法:该前瞻性体内实验包括6组(每组12个样品)。组DP-Clin,INV-Clin和CA-Clin由直接印刷（TeraHarzTC-85DAC树脂）组成，热成型(Invisalign，PU基聚合物)和室内热成型(CA-Pro，PET-G基聚合物)矫正器，在口腔内服务1周后检索。组DP-Ctr,INV-Ctr和CA-Ctr包括未使用的对准器样品。使用共聚焦激光扫描显微镜(CLSM)进行厚度测量。通过多元线性回归分析(p<.05)分析经过log-10转化的数据。
结果：在Clin和Ctr类别的材料之间发现了统计学上的显着差异（p<.001）。DP组在各组中具有最高的厚度,并且在CA组中观察到最小的厚度(p〈.001)。然而,口内老化对任何组的矫正器厚度均无显著影响.
结论：透明矫正器的热成型和直接印刷均导致厚度偏差，即印刷矫正器的厚度增加和热成型矫正器的厚度减少。口腔内老化不影响任何组中的矫正器厚度。
