Precision of slot widths and torque transmission of in-office 3D printed brackets : An in vitro study.

IF 1.3 4区医学 Q3 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie Pub Date : 2024-09-01 Epub Date: 2023-03-02 DOI:10.1007/s00056-023-00460-8

Carolien A J Bauer, Mats Scheurer, Christoph Bourauel, J Philippe Kretzer, Christoph J Roser, Christopher J Lux, Lutz D Hodecker

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引用次数: 0

Abstract

Purpose: To investigate a novel in-office three-dimensionally (3D) printed polymer bracket regarding slot precision and torque transmission.

Methods: Based on a 0.022″ bracket system, stereolithography was used to manufacture brackets (N = 30) from a high-performance polymer that met Medical Device Regulation (MDR) IIa requirements. Conventional metal and ceramic brackets were used for comparison. Slot precision was determined using calibrated plug gages. Torque transmission was measured after artificial aging. Palatal and vestibular crown torques were measured from 0 to 20° using titanium-molybdenum (T) and stainless steel (S) wires (0.019″ × 0.025″) in a biomechanical experimental setup. The Kruskal-Wallis test with post hoc test (Dunn-Bonferroni) was used for statistical analyses (significance level p < 0.05).

Results: The slot sizes of all three bracket groups were within the tolerance range according to DIN 13996 (ceramic [C]: 0.581 ± 0.003 mm; metal [M]: 0.6 ± 0.005 mm; polymer [P]: 0.581 ± 0.010 mm). The maximum torque values of all bracket-arch combinations were above the clinically relevant range of 5-20 Nmm (PS: 30 ± 8.6 Nmm; PT: 27.8 ± 14.2 Nmm; CS: 24 ± 5.6 Nmm; CT: 19.9 ± 3.8 Nmm; MS: 21.4 ± 6.7 Nmm; MT: 16.7 ± 4.6 Nmm).

Conclusions: The novel, in-office manufactured polymer bracket showed comparable results to established bracket materials regarding slot precision and torque transmission. Given its high individualization possibilities as well as enabling an entire in-house supply chain, the novel polymer brackets bear high potential of future usage for orthodontic appliances.

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诊所内 3D 打印支架的槽宽精度和扭矩传输：体外研究。

目的：研究一种新型诊室三维（3D）打印聚合物支架的槽沟精度和扭矩传输：方法：在0.022英寸托槽系统的基础上，使用立体光刻技术制造托槽（N = 30），托槽由符合《医疗器械管理条例》（MDR）IIa要求的高性能聚合物制成。传统金属托槽和陶瓷托槽用作对比。使用校准的塞规确定槽口精度。人工老化后测量扭矩传递。在生物力学实验装置中，使用钛钼（T）丝和不锈钢（S）丝（0.019″ × 0.025″）测量了腭和前庭牙冠从 0° 到 20° 的扭矩。采用 Kruskal-Wallis 检验和事后检验（Dunn-Bonferroni）进行统计分析（显著性水平 p）：根据 DIN 13996 标准，所有三组支架的槽沟尺寸都在公差范围内（陶瓷[C]：0.581 ± 0.003 mm；金属[M]：0.6 ± 0.005 mm；聚合物[P]：0.581 ± 0.010 mm）。所有托槽-牙弓组合的最大扭矩值均高于 5-20 Nmm 的临床相关范围（PS：30 ± 8.6 Nmm；PT：27.8 ± 14.2 Nmm；CS：24 ± 5.6 Nmm；CT：19.9 ± 3.8 Nmm；MS：21.4 ± 6.7 Nmm；MT：16.7 ± 4.6 Nmm）：在槽沟精度和扭矩传递方面，这种新型的诊室内制造的聚合物托槽与现有的托槽材料具有可比性。鉴于这种新型聚合物托槽具有高度个性化的可能性，并可实现整个内部供应链，因此未来在正畸装置中的应用潜力很大。

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来源期刊

Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie 医学-牙科与口腔外科

CiteScore

3.90

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Journal of Orofacial Orthopedics provides orthodontists and dentists who are also actively interested in orthodontics, whether in university clinics or private practice, with highly authoritative and up-to-date information based on experimental and clinical research. The journal is one of the leading publications for the promulgation of the results of original work both in the areas of scientific and clinical orthodontics and related areas. All articles undergo peer review before publication. The German Society of Orthodontics (DGKFO) also publishes in the journal important communications, statements and announcements.