Bhate Manjiri, Nagesh Shweta
Orthodontics and Dentofacial Orthopedics, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, IND.
Cureus. 2024 Jul 19;16(7):e64933. doi: 10.7759/cureus.64933. eCollection 2024 Jul.
Background Choosing the optimal aligner material on the market is crucial to ensure constant forces for tooth displacement. Processes like manufacturing and intraoral usage can result in the degradation of certain properties, which can affect the overall efficacy of treatment. Objective The objective of the study is to compare the surface roughness and flexural modulus of two aligner materials following the processes of thermoforming and aging. Materials and methods Two groups of 12 samples each were tested: Group 1 consisted of polyethylene terephthalate glycol (PET-G) and Group 2 of zendura-polyurethane (PU). The groups were tested at three time points: T0 - pre-thermoformed; T1 - after thermoforming; T2 - after thermoforming and aging. The surface roughness and the flexural modulus were evaluated. One-way ANOVA followed by a Bonferroni post hoc test was conducted to compare the changes within each group across the three times. An independent t-test was done to compare the values between the two groups at each time point. The statistical tests were performed using SPSS software version 26 (IBM Corp., Armonk, NY, USA). P-values >0.05 were considered statistically significant. Results There was a significant change in the surface roughness post-aging in Group 2 (p=0.03) and flexural strength within Group 1 (p=0.031) and Group 2 (p=0.06) across the three time points. Comparing the changes within the three time points in Group 1, significant changes were observed between T0-T1 (p=0.045) and T0-T2 (p=0.07). In Group 2, significant changes were observed between T0-T2 (p=0.012). Comparing the flexural strength between the two groups, significant differences were observed at T0 (p=0.012) and T1 (p=0.001). Conclusion The aging process affected the surface roughness in Zendura (PU). The thermoforming and aging process resulted in reduced flexural strength in both Zendura (PU) and Duran groups (PET-G).
在市场上选择最佳的矫治器材料对于确保牙齿移动的恒定力量至关重要。制造和口腔内使用等过程可能会导致某些性能下降，从而影响治疗的整体效果。目的：本研究的目的是比较两种矫治器材料在热成型和老化过程后的表面粗糙度和弯曲模量。材料和方法：对两组各12个样本进行测试：第1组由聚对苯二甲酸乙二醇酯二醇（PET-G）组成，第2组由zendura-聚氨酯（PU）组成。在三个时间点对各组进行测试：T0 - 热成型前；T1 - 热成型后；T2 - 热成型和老化后。评估表面粗糙度和弯曲模量。进行单因素方差分析，然后进行Bonferroni事后检验，以比较每组在三个时间点的变化。进行独立t检验以比较两个组在每个时间点的值。使用SPSS软件版本26（美国纽约州阿蒙克市IBM公司）进行统计测试。P值>0.05被认为具有统计学意义。结果：在三个时间点上，第2组老化后的表面粗糙度（p = 0.03）以及第1组（p = 0.031）和第2组（p = 0.06）的弯曲强度有显著变化。比较第1组三个时间点的变化，在T0-T1（p = 0.045）和T0-T2（p = 0.07）之间观察到显著变化。在第2组中，在T0-T2之间观察到显著变化（p = 0.012）。比较两组之间的弯曲强度，在T0（p = 0.012）和T1（p = 0.001）观察到显著差异。结论：老化过程影响了Zendura（PU）的表面粗糙度。热成型和老化过程导致Zendura（PU）和Duran组（PET-G）的弯曲强度降低。
