Department of Orthodontics, School of Dentistry, University of Washington, Seattle, Wash.
Department of Orthodontics, School of Dentistry, University of Washington, Seattle, Wash.
Am J Orthod Dentofacial Orthop. 2019 Dec;156(6):727-734. doi: 10.1016/j.ajodo.2018.11.020.
Tooth size and morphology of anterior teeth influence interarch relationships. The Bolton analysis uses tooth width to calculate a sum of mandibular to maxillary tooth width ratios necessary for proper occlusion. Several parameters not factored in the Bolton analysis influence occlusion, such as tooth thickness. This study sought to use 3D modeling to develop and assess a tooth size analysis that encompasses labioligual thickness as well as mesiodistal width of anterior teeth.
The role of tooth thickness in interarch relationships was studied using simulations in a 3D modeling software (Suresmile). To develop a new chart of interarch ratios based on tooth thickness, a series of simulations were produced with varying tooth thicknesses and widths. The new ratios were evaluated on records from 50 patients.
Findings from the simulations suggest that the ideal tooth thickness remains approximately 2 mm if the overall tooth width of the dentition increases and the interarch anterior ratio is maintained. The thickness-adjusted anterior mandibular to maxillary tooth ratio ranges from 0.70-0.79 depending on the tooth thickness. This thickness-adjusted ratio provides a superior prediction for the sum of anterior tooth width compared with the Bolton analysis.
Tooth thickness affects interarch tooth width ratios and anterior occlusion. A thickness-adjusted ratio can be used to more accurately predict anterior tooth dimensions necessary to achieve proper occlusion.
前牙的大小和形态会影响牙弓之间的关系。博尔顿分析使用牙宽来计算适当咬合所需的下颌与上颌牙宽比值的总和。几个未纳入博尔顿分析的参数会影响咬合，如牙厚度。本研究旨在使用 3D 建模来开发和评估一种包含前牙唇舌厚度和近远中宽度的牙齿大小分析。
使用 3D 建模软件（SureSmile）中的模拟研究了牙厚度在牙弓关系中的作用。为了根据牙厚度开发新的牙弓比值图表，进行了一系列具有不同牙厚度和宽度的模拟。使用 50 名患者的记录评估了新比值。
模拟结果表明，如果牙列的总牙宽增加且保持牙弓前牙比例，则理想的牙厚度仍保持在大约 2mm。根据牙厚度，调整后的前牙下颌与上颌牙比值范围为 0.70-0.79。与博尔顿分析相比，这种经过厚度调整的比值能更准确地预测前牙宽度的总和。
牙厚度会影响牙弓的牙宽比值和前牙咬合。经过厚度调整的比值可用于更准确地预测实现适当咬合所需的前牙尺寸。
