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Three-dimensional volumetric changes in TMJ space following mandibular advancement surgery in skeletal Class II patients: a CBCT analysis
Three-dimensional volumetric changes in TMJ space following mandibular advancement surgery in skeletal Class II patients: a CBCT analysis
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Three-dimensional volumetric changes in TMJ space following mandibular advancement surgery in skeletal Class II patients: a CBCT analysis
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Three-dimensional volumetric changes in TMJ space following mandibular advancement surgery in skeletal Class II patients: a CBCT analysis
Three-dimensional volumetric changes in TMJ space following mandibular advancement surgery in skeletal Class II patients: a CBCT analysis

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Three-dimensional volumetric changes in TMJ space following mandibular advancement surgery in skeletal Class II patients: a CBCT analysis
Three-dimensional volumetric changes in TMJ space following mandibular advancement surgery in skeletal Class II patients: a CBCT analysis
Journal Article

Three-dimensional volumetric changes in TMJ space following mandibular advancement surgery in skeletal Class II patients: a CBCT analysis

2025
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Overview
ABSTRACT Objective: The aim of the present study was to assess three-dimensional volumetric changes in the temporomandibular joint (TMJ) space after mandibular advancement surgery in skeletal Class II cases with retrognathic mandibles. The null hypothesis for this study posited that there would be no statistical changes after orthognathic surgery. Materials and methods: A retrospective study was conducted on 30 cone-beam computed tomographic (CBCT) records of skeletal Class II patients with retrognathic mandibles who were treated with bilateral sagittal split osteotomy (BSSO) for mandibular advancement of 6-8 mm. Volumetric assessments of joint space were performed pre-operative (T0), one-week post-operative (T1), and 12-month post-operatively (T2). Results: The mean anterior joint space exhibited an increase from 612.37 mm3 at T0 to 876.67 mm3 at T1, followed by a slight reduction to 862.4 mm3 at T2. Conversely, the posterior joint space diminished from 861 mm3 at T0 to 736.27 mm3 at T1 and further to 653.07 mm3 at T2. The medial joint space experienced an increase from 525.83 mm3 at T0 to 850.93 mm3 at T1, before declining to 596.77 mm3 at T2. The lateral joint space showed a decrease from 951 mm3 at T0 to 762 mm3 at T1, subsequently rising to 918.7 mm3 at T2. Strong positive correlation coefficients (approaching 1) were observed in the majority of the T1 and T2 comparisons (p < 0.05). Conclusion: Significant volumetric changes were observed in the TMJ space after mandibular advancement surgery for retrognathism. The changes were maintained even 12 months after surgery, with a slight relapse. RESUMO Objetivo: O objetivo do presente estudo foi avaliar as alterações volumétricas tridimensionais no espaço da articulação temporomandibular (ATM) após cirurgia de avanço mandibular em casos de Classe II esquelética com mandíbulas retrognáticas. A hipótese nula para este estudo foi a de que não haveria alterações estatísticas após a cirurgia ortognática. Material e métodos: Foi realizado um estudo retrospectivo com 30 documentações contendo tomografia computadorizada de feixe cônico (TCFC) de pacientes com Classe II esquelética com mandíbulas retrognáticas, tratados com osteotomia sagital bilateral (BSSO) para avanço mandibular de 6 a 8 mm. Avaliações volumétricas do espaço articular foram realizadas no pré-operatório (T0), uma semana após a cirurgia (T1) e 12 meses após a cirurgia (T2). Resultados: O espaço articular anterior médio apresentou um aumento de 612,37 mm3 em T0 a 876,67 mm3 em T1, seguido de uma ligeira redução para 862,4 mm3 em T2. Por outro lado, o espaço articular posterior diminuiu de 861 mm3 em T0 para 736,27 mm3 em T1 e posteriormente para 653,07 mm3 em T2. O espaço articular medial sofreu um aumento de 525,83 mm3 em T0 para 850,93 mm3 em T1, antes de diminuir para 596,77 mm3 em T2. O espaço articular lateral apresentou diminuição de 951 mm3 em T0 para 762 mm3 em T1, aumentando posteriormente para 918,7 mm3 em T2. Coeficientes de correlação fortemente positivos (aproximando-se de 1) foram observados na maioria das comparações T1 e T2 (p < 0,05). Conclusão: Alterações volumétricas significativas foram observadas no espaço da ATM após cirurgia de avanço mandibular nos casos de retrognatismo. As alterações se mantiveram mesmo 12 meses após a cirurgia, com uma leve recidiva.
Publisher
Dental Press International,Dental Press Editora