Nguyen Viet Anh, Nguyen Thuy Anh, Doan Hong Le, Pham Thi Hanh, Doan Bich Ngoc, Pham Thi Thanh Thuy, Hoang Viet
Faculty of Dentistry, PHENIKAA University, Hanoi, Vietnam.
Private Practice, Viet Anh Orthodontic Clinic, Hanoi, Vietnam.
PLoS One. 2025 Jan 22;20(1):e0316208. doi: 10.1371/journal.pone.0316208. eCollection 2025.
This study aims to evaluate the clinical transfer accuracy of partially enclosed single hard vacuum-formed trays based on three-dimensional (3D) printed models for lingual bracket indirect bonding.
Thirty-two consecutive patients receiving lingual orthodontic treatment were enrolled. Digital models with ideal bracket positions were 3D-printed, followed by fabrication of partially enclosed single hard vacuum-formed trays. Digital impressions captured actual bracket positions and were compared to the ideal positions. One-tailed t-tests assessed if errors were within clinically acceptable thresholds of 0.5 mm for linear measurements and 2° for angular measurements.
Mean bracket transfer errors were 0.052 mm, 0.076 mm, 0.106 mm, 0.795°, 1.344°, and 2.485° for mesiodistal, buccolingual, occlusogingival, rotation, tip, and torque, respectively. Transfer errors were statistically below the clinically acceptable thresholds for all dimensions except torque. Frequencies of acceptable transfer errors were 100%, 100%, 99.3%, 93.1%, 78.3%, and 54.0%, respectively.
Partially enclosed single hard vacuum-formed trays with 3D-printed models transfer lingual brackets with high accuracy in the mesiodistal, buccolingual, and occlusogingival dimensions, rotation, and tip. However, the transfer of torque remains questionable.
本研究旨在评估基于三维（3D）打印模型的部分封闭式单硬真空成型托盘用于舌侧托槽间接粘接的临床转移准确性。
连续纳入32例接受舌侧正畸治疗的患者。将具有理想托槽位置的数字模型进行3D打印，然后制作部分封闭式单硬真空成型托盘。通过数字印模获取实际托槽位置，并与理想位置进行比较。采用单尾t检验评估线性测量误差是否在临床可接受的0.5mm阈值内，角度测量误差是否在2°阈值内。
近远中、颊舌向、牙合龈向、旋转、倾斜和转矩的平均托槽转移误差分别为0.052mm、0.076mm、0.106mm、0.795°、1.344°和2.485°。除转矩外，所有维度的转移误差在统计学上均低于临床可接受阈值。可接受转移误差的频率分别为100%、100%、99.3%、93.1%、78.3%和54.0%。
基于3D打印模型的部分封闭式单硬真空成型托盘在近远中、颊舌向、牙合龈向维度、旋转和倾斜方面能高精度转移舌侧托槽。然而，转矩的转移仍存在疑问。
