Oliveira Ana Catarina, Rocha Ana Sofia, Leitão Rita, Maia Manuela, Pinho Teresa
UNIPRO-Oral Pathology and Rehabilitation Research Unit, University Institute of Health Science (IUCS), CESPU, 4585-116 Gandra, Portugal.
IPMAIA-Instituto Politécnico da Maia, Avenida Carlos de Oliveira Campos, Castêlo da Maia, 4475-690 Maia, Portugal.
Dent J (Basel). 2023 Aug 3;11(8):186. doi: 10.3390/dj11080186.
Coronal torque is one of the key factors in orthodontic treatment. An adequate torque value has an impact on aesthetics and soft tissue profile. The aim of this quantitative, comparative and observational longitudinal cohort study was to analyze the efficacy of the maxillary central incisor coronal torque in the Invisalign system and evaluate the relation between coronal torque movement and patient's facial biotype. In total, 27 patients were selected. The planned movements (TP) were obtained from the Invisalign Doctor Site using mathematical formulas that consider the T0 measurements. Pre-treatment (T0) and after full use of the first set of aligners (T1) scanners were evaluated using Geomagic Control X by superimposing T0 and T1 models using a transverse plane and the long axis of the tooth crown. IBM SPSS software was used for statistical purposes. We found statistically significant differences between T0 and T1 in pro-inclination and retro-inclination, as well as between achieved and planned values in pro-inclination ( = 0.011). We verified that hyperdivergent clinical cases presented higher mean values of coronal torque, and hypodivergent cases presented lower values. In pro-inclination, the differences between the planned and achieved values were greater in hypodivergent cases and smaller in hyperdivergent cases. In retro-inclination, the differences between the planned and achieved values were greater in normodivergent cases and smaller in hypodivergent cases. This study highlights that inefficacy is more accentuated in pro-inclination. Aligners are an effective tool for producing coronal repercussions of torque movement, being more effective in retro-inclination.
冠转矩是正畸治疗的关键因素之一。适当的转矩值会影响美观和软组织侧貌。这项定量、比较性和观察性纵向队列研究的目的是分析隐适美系统中上颌中切牙冠转矩的疗效，并评估冠转矩移动与患者面部生物型之间的关系。总共选取了27例患者。计划移动（TP）是通过使用考虑T0测量值的数学公式从隐适美医生网站获得的。使用Geomagic Control X软件，通过使用横平面和牙冠长轴叠加T0和T1模型，对治疗前（T0）和首次全套矫治器使用完毕后（T1）进行扫描评估。使用IBM SPSS软件进行统计分析。我们发现T0和T1在前倾和后倾方面存在统计学显著差异，以及前倾方面的实际值与计划值之间也存在差异（P = 0.011）。我们证实，高角临床病例的冠转矩平均值较高，低角病例的冠转矩平均值较低。在前倾方面，低角病例的计划值与实际值之间的差异较大，高角病例的差异较小。在后倾方面，均角病例的计划值与实际值之间的差异较大，低角病例的差异较小。本研究强调，前倾时无效更为明显。矫治器是产生转矩移动冠部影响的有效工具，在后倾时更有效。
