Pattern of change in force and moment according to amounts of labial tipping and material types of clear aligner: In vitro experiment with a six-axis mechanical sensor apparatus

• 발행기관: 대한치과교정학회
• 저자명: Keun-Chul Cho Il-Hyung Yang Michael Lee Ki Beom Kim Seung-Hak Baek
• 간행물 정보: 『The Korean Journal of Orthodontics』제55권 제4호, 290~305쪽, 전체 16쪽
• 주제분류: 의약학 > 기타의약학
• 파일형태: PDF
• 발행일자: 2025.07.31

국문 초록

Objective: To investigate the pattern of change in force and moment according to the amounts of labial tipping and the material types of clear aligners (CA). Methods: A 3D-printed maxillary typodont system, including crown, root, and periodontal ligament space, was constructed. Six groups were established based on the amount of labial tipping of #12 (0.3 mm and 0.6 mm), and the material types (Zendura [thermoplastic, one-layer, 0.75 mm], Trioclear [thermoplastic, three-layer, 0.5 mm], and Graphy TA-28 [direct printing, 0.5 mm]) (n = 6/group). A six-axis mechanical sensor apparatus was connected to the roots. Force and moment were measured after seating the CA in a 37°C water bath. Results: When comparing 0.3 mm and 0.6 mm tipping, #12 showed an increase in labial inclination moment (Lab-inclination moment) in Zendura (P < 0.05); a decrease in labial force and an increase in Lab-inclination-moment in Trioclear (P < 0.05, P < 0.01); while a lingual force and Lab-inclination moment without significant change in Graphy (all P > 0.05). For 0.3 mm tipping, the amounts of labio-lingual forces and Lab-inclination moment did not differ among the three materials (all P > 0.05). However, at 0.6 mm tipping, Zendura exerted a greater labial force than Trioclear, while Graphy produced a lingual force (P < 0.01). Zendura and Trioclear generated a stronger Lab-inclination moment compared to Graphy (P < 0.01). Despite displaying unexpected force and moment directions, Graphy consistently exhibited the lowest absolute values among the groups. Conclusions: Clinicians should select the appropriate aligner material based on the specific biomechanical requirements to prevent unexpected forces and moments.

목차

INTRODUCTION

MATERIALS AND METHODS

RESULTS

DISCUSSION

CONCLUSIONS

References

키워드

Force Moment Labial tipping Clear aligner