Comparison of the stress direction on the TMJ in patients with class I, II, and III skeletal relationships

Orthodontics & Craniofacial Research
K UekiD M Laskin

Abstract

To assess the relationship between skeletal morphology and stress direction on the temporomandibular joint (TMJ) by a two-dimensional rigid body spring model (RBSM). Lateral cephalograms were analyzed and the information was processed with a fortran analysis program. The subjects were 149 patients (54 men and 95 women, mean age 21.8 +/- 5.9 years) from Kanazawa University Hospital and the School of Dentistry, Virginia Commonwealth University. Of the 149 cases, 48 were skeletal class I, 54 were class II, and 47 were class III. The patients had no TMJ symptoms or abnormalities. The force vector on the condyle, its direction (Ph angle), the degree of the vector (Ph) and the displacement vector (u, v), and the rotational angle (theta) of the mandibular body were calculated by RBSM. The direction of the force vector (Ph angle) on the condyle was 24.83 degrees +/- 4.67 degrees in the class II group, 21.04 degrees +/- 5.59 degrees in the class I group, and 19.58 +/- 7.57 degrees in the class III group. The Ph angle of the class II group was significantly larger than those of the class I and III groups (p < 0.05). This study suggests that differences in skeletal patterns induce differences in stress distribution on the TMJ; the morphol...Continue Reading

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Citations

Dec 18, 2012·Head & Face Medicine·Matteo SaccucciSimona Tecco
Jul 24, 2012·Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology·Koichiro UekiShuichi Kawashiri
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Aug 26, 2014·Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology·Soo-Min OkSung-Hee Jeong
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Mar 2, 2017·Oral and Maxillofacial Surgery·Koichiro UekiTatsuya Tsunoda
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Feb 6, 2020·Oral Radiology·Gülay Altan Şallı, Zeynep Öztürkmen
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May 18, 2021·Journal of Cranio-maxillo-facial Surgery : Official Publication of the European Association for Cranio-Maxillo-Facial Surgery·Koichiro UekiAkinori Moroi

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