Scholarlink

Background <p>Patients with retrognathia (skeletal Class II) are more frequently associated with condylar resorption and temporomandibular disorders (TMD) than those with prognathism (skeletal Class III). Differences in condylar morphology, mandibular movement, and force transmission are believed to predispose Class II patients to increased joint stress. Several biomechanical simulation studies support this concept; however, such approaches cannot capture cumulative biological adaptation occurring in vivo.</p> Objective <p>To investigate differences in stress distribution patterns between skeletal Class II and skeletal Class III patients by evaluating cumulative in vivo mechanical loading using computed tomography osteoabsorptiometry (CTOAM).</p> Methods <p>Seven patients with skeletal Class II malocclusion and seven with skeletal Class III malocclusion were included based on strict inclusion criteria; all presented with a pronounced open bite. A control group without temporomandibular joint dysfunction was also included, resulting in the analysis of 38 condyles from 19 patients. Subchondral bone density distribution was assessed using CTOAM, focusing on the localization and relative proportion of high-density areas (%HDA).</p> Results <p>No significant difference in total %HDA was observed between skeletal Classes II and III. However, regional distribution patterns differed. In all groups, the anterior half of the condyle exhibited significantly higher %HDA than the posterior half. In skeletal Class II only, the lateral half demonstrated significantly greater %HDA than the medial half. The anterolateral region exhibited the highest %HDA and showed a significant positive correlation with overjet (p &lt; 0.01, r = 0.800). Skeletal Class III and control groups displayed similar regional tendencies with varying magnitudes, whereas Class II demonstrated a comparatively distinct distribution pattern.</p> Conclusions <p>These findings suggest regional differences in subchondral bone adaptation between skeletal patterns, particularly in the anterolateral region of skeletal Class II. The results are consistent with previous simulation-based observations and warrant further investigation in larger, longitudinal studies.</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

Evaluation of the Difference in Stress Distribution Patterns on the Condyle Between Skeletal Classes Using CTOAM

  • 期刊论文

  • 发表日期：

    2026年3月7日

查看全文
  • Kazuhiro Matsushita,
  • Yuichiro Matsui,
  • Kaori Endo,
  • Hirofumi Miyaji,
  • Norimasa Iwasaki

摘要

Background

Patients with retrognathia (skeletal Class II) are more frequently associated with condylar resorption and temporomandibular disorders (TMD) than those with prognathism (skeletal Class III). Differences in condylar morphology, mandibular movement, and force transmission are believed to predispose Class II patients to increased joint stress. Several biomechanical simulation studies support this concept; however, such approaches cannot capture cumulative biological adaptation occurring in vivo.

Objective

To investigate differences in stress distribution patterns between skeletal Class II and skeletal Class III patients by evaluating cumulative in vivo mechanical loading using computed tomography osteoabsorptiometry (CTOAM).

Methods

Seven patients with skeletal Class II malocclusion and seven with skeletal Class III malocclusion were included based on strict inclusion criteria; all presented with a pronounced open bite. A control group without temporomandibular joint dysfunction was also included, resulting in the analysis of 38 condyles from 19 patients. Subchondral bone density distribution was assessed using CTOAM, focusing on the localization and relative proportion of high-density areas (%HDA).

Results

No significant difference in total %HDA was observed between skeletal Classes II and III. However, regional distribution patterns differed. In all groups, the anterior half of the condyle exhibited significantly higher %HDA than the posterior half. In skeletal Class II only, the lateral half demonstrated significantly greater %HDA than the medial half. The anterolateral region exhibited the highest %HDA and showed a significant positive correlation with overjet (p < 0.01, r = 0.800). Skeletal Class III and control groups displayed similar regional tendencies with varying magnitudes, whereas Class II demonstrated a comparatively distinct distribution pattern.

Conclusions

These findings suggest regional differences in subchondral bone adaptation between skeletal patterns, particularly in the anterolateral region of skeletal Class II. The results are consistent with previous simulation-based observations and warrant further investigation in larger, longitudinal studies.