Long-term evaluation of progressive condylar resorption after orthognathic surgery in mandibular retrognathism with high mandibular plane angle: An analysis of three-dimensional computed tomography

IF 2 3区医学 Q2 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of Stomatology Oral and Maxillofacial Surgery Pub Date : 2025-10-01 DOI:10.1016/j.jormas.2025.102428

Hoyoung Kim , Joonyoung Huh , Jiwon Do , Hoon Joo Yang

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Abstract

Introduction

The purposes of this study were to analyze the volumetric change of condyle in postoperative progressive condylar resorption (PCR) using three-dimensional computed tomography (3D CT) over a long-term follow-up period of at least 2 years after mandibular advancement surgery, and the correlation between changes in the condylar volume in 3D CT and the condylar size in orthopantomogram (OPG).

Material and methods

In 14 female patients with mandibular retrognathism and a high mandibular plane angle who underwent orthognathic surgery, OPGs, lateral cephalograms, and 3D CT scans were acquired before the surgery, immediately after the surgery, and at a follow-up of at least 2 years. Surgical movements and postoperative skeletal changes in lateral cephalogram, change of condylar size in OPG, and changes of condylar position and volume in CT were measured and statistically analyzed.

Results

The average reduction in condylar volume was 154.3 mm³ (19.1 %). Postoperative PCR was observed in a total of 12 condyles in eight patients. The change in condylar volume positively correlated with changes in condylar width (p < 0.01) but not with changes in the condylar height on OPG.

Discussion

The condylar width should be evaluated, instead of the height, when diagnosing PCR using OPG.

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下颌高平面角后颌畸形正颌手术后渐进式髁突吸收的长期评价：三维计算机断层分析。

前言：本研究的目的是通过对下颌骨前移手术后至少2年的长期随访，利用三维计算机断层扫描（3D CT）分析术后渐进式髁突吸收（PCR）中髁突体积的变化，以及3D CT中髁突体积的变化与骨科断层扫描（OPG）中髁突大小的相关性。材料与方法：14例女性下颌后颌高平面角患者行正颌手术，术前、术后即刻及随访至少2年，均行OPGs、侧位头颅片及3D CT扫描。测量手术运动和术后侧位头颅片骨骼变化，OPG检查髁突大小变化，CT检查髁突位置和体积变化，并进行统计学分析。结果：髁突体积平均缩小154.3 mm3（19.1%）。术后对8例患者共12个髁进行PCR观察。髁突体积变化与髁突宽度变化呈正相关（p < 0.01），与髁突高度变化不相关（p < 0.01）。讨论：当使用OPG诊断PCR时，应评估髁突宽度，而不是高度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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