J Korean Assoc Oral Maxillofac Surg.  2014 Aug;40(4):160-168. 10.5125/jkaoms.2014.40.4.160.

Positional change of the condyle after orthodontic-orthognathic surgical treatment: is there a relationship to skeletal relapse?

• Zafar H
• Choi DS
• Jang I
• Cha BK
• Park YW

• KMID: 2005440
• DOI: http://doi.org/10.5125/jkaoms.2014.40.4.160

Abstract

OBJECTIVES
The purpose of this study was to evaluate the condylar position in relation to the glenoid fossa before and after orthodontic-orthognathic surgical treatment and to investigate the relationship with skeletal relapse.
MATERIALS AND METHODS
Lateral cephalograms and temporomandibular joint tomograms from 19 patients with mandibular prognathism who received orthodontic-orthognathic surgery were included in this study. Samples were divided into two groups based on skeletal change during the retention period. The relapse group consisted of 7 patients (3 females and 4 males; mean age, 21.9 years) whose pogonion or menton displaced more than 1 mm during the retention period and the stable group consisted of 12 patients (5 females and 7 males; mean age, 21.7 years). Anterior joint space, posterior joint space, superior joint space, and anteroposterior index were measured on tomograms at pretreatment and posttreatment timepoints. Condyle position and frequency of the positional change were compared between both groups.
RESULTS
In the relapse group and stable group, 42.9% and 45.8% of the condyles, respectively, showed forward or backward displacement at posttreatment. However, the changes were small and the mean anterior, posterior, superior joint spaces and frequencies of the positional changes did not differ statistically between both groups.
CONCLUSION
Our results suggest that small positional changes of the condyle, which may occur after orthodontic-orthognathic surgery treatment, may not be related to skeletal relapse after removal of the orthodontic appliances.

Keyword

Mandibular condyle; Malocclusion; Orthognathic surgery; Temporomandibular joint

MeSH Terms

Female
Humans
Joints
Male
Malocclusion
Mandibular Condyle
Orthodontic Appliances
Orthognathic Surgery
Prognathism
Recurrence*
Temporomandibular Joint

Figure

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  Fig. 1 Cephalometric measurements. Me to FH plane and Pog to FHV. Refer to Table 1 for the definitions of landmarks.

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  Fig. 2 Tracing of temporomandibular joint tomogram to evaluate superior joint space (SJS), anterior joint space (AJS), and posterior joint space (PJS). (FH: Frankfort horizontal, A: the most superior point of the glenoid fossa, B: the most superior point of the condyle, C: tangent to the anterior surface of condyle from point A, D: tangent to the posterior surface of condyle from point A, E: intersection point perpendicular to A-C line from point C and anterior slope of the glenoid fossa, F: intersection point between the point perpendicular to A-D line from point D and the posterior slope of glenoid fossa)Husanov Zafar et al: Positional change of the condyle after orthodontic-orthognathic surgical treatment: is there a relationship to skeletal relapse? J Korean Assoc Oral Maxillofac Surg 2014

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  Fig. 3 Temporomandibular joint tomograms at pretreatment (T1) and posttreatment (T2) showing three patterns of positional changes of the condyle. A. C-C pattern (unchanged). B. C-A pattern (forward movement). C. A-C pattern (backward movement). Refer to Table 3 for the definitions of patterns.Husanov Zafar et al: Positional change of the condyle after orthodontic-orthognathic surgical treatment: is there a relationship to skeletal relapse? J Korean Assoc Oral Maxillofac Surg 2014

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