Scholarlink

Objectives <p>To evaluate angular and linear tooth movements following orthodontic treatment for correction of moderate to severe crowding using clear aligner therapy (CAT).</p> Materials and methods <p>This retrospective study included 46 patients treated with clear aligners in permanent dentition for correction of moderate to severe crowding. Twenty-three patients (6 males, 17 females; mean age 20.0 years) were treated with premolar extractions and 23 patients (8 males, 15 females; mean age 17.3 years) were treated without premolar extractions. Three-dimensional tooth linear and angular displacements were quantified in the pre- and post-treatment digital dental models superimposed using the Slicer Automated Dental Tools module of 3D Slicer software (<a href="http://www.slicer.org">www.slicer.org</a>). Generalized estimation equations were used for group comparisons (<i>p</i> &lt; 0.05).</p> Results <p>CAT correction of moderate to severe crowding with premolar extraction led to significant retroclination of upper and lower incisors (upper: -6.71° ±7.79, <i>P</i> &lt; 0.001 and lower: -5.11° ±8.49, <i>P</i> &lt; 0.001). Anchorage control in extraction cases was limited, with approximately equal molar mesialization and incisor lingualization. In non-extraction cases, crowding was corrected through arch expansion with flaring of incisors. Vertical changes were similar between groups.</p> Conclusions <p>CAT of moderate to severe crowding without extraction led to arch expansion and proclination of incisors. In contrast, premolar extraction cases often presented incisor retroclination and molar mesial tipping, requiring careful biomechanical management.</p> Clinical relevance <p>These findings help clinicians plan treatments, manage patient expectations, and anticipate side effects, enabling the use of proper strategies and resources to optimize outcomes in both extraction and non-extraction cases.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Three-dimensional assessment of tooth movements in clear aligner treatment of moderate and severe crowding

  • 期刊论文

  • 发表日期：

    2025年12月9日

查看全文
  • Margaret Eason,
  • Sandra Khong Tai,
  • Charlene Tai Loh,
  • Aron Aliaga del Castillo,
  • Rodrigo Teixeira,
  • Nathan Hutin,
  • Gaëlle Leroux,
  • Marcela Lima Gurgel,
  • Claudia Trindade Mattos,
  • Antonio Carlos de Oliveira Ruellas,
  • Mary Barkley,
  • Eric Hannapel,
  • Lucia Cevidanes

摘要

Objectives

To evaluate angular and linear tooth movements following orthodontic treatment for correction of moderate to severe crowding using clear aligner therapy (CAT).

Materials and methods

This retrospective study included 46 patients treated with clear aligners in permanent dentition for correction of moderate to severe crowding. Twenty-three patients (6 males, 17 females; mean age 20.0 years) were treated with premolar extractions and 23 patients (8 males, 15 females; mean age 17.3 years) were treated without premolar extractions. Three-dimensional tooth linear and angular displacements were quantified in the pre- and post-treatment digital dental models superimposed using the Slicer Automated Dental Tools module of 3D Slicer software (www.slicer.org). Generalized estimation equations were used for group comparisons (p < 0.05).

Results

CAT correction of moderate to severe crowding with premolar extraction led to significant retroclination of upper and lower incisors (upper: -6.71° ±7.79, P < 0.001 and lower: -5.11° ±8.49, P < 0.001). Anchorage control in extraction cases was limited, with approximately equal molar mesialization and incisor lingualization. In non-extraction cases, crowding was corrected through arch expansion with flaring of incisors. Vertical changes were similar between groups.

Conclusions

CAT of moderate to severe crowding without extraction led to arch expansion and proclination of incisors. In contrast, premolar extraction cases often presented incisor retroclination and molar mesial tipping, requiring careful biomechanical management.

Clinical relevance

These findings help clinicians plan treatments, manage patient expectations, and anticipate side effects, enabling the use of proper strategies and resources to optimize outcomes in both extraction and non-extraction cases.