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KJO Korean Journal of Orthodontics

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pISSN 2234-7518
eISSN 2005-372X
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Original Article

Korean J Orthod 2010; 40(5): 304-313   https://doi.org/10.4041/kjod.2010.40.5.304

First Published Date October 31, 2010, Publication Date October 31, 2010

Copyright © The Korean Association of Orthodontists.

Comparisons of occlusal force according to occlusal relationship, skeletal pattern, age and gender in Koreans

Hye-Rim Yoon, DDS, MSD, aYoon-Jeong Choi, DDS, MSD, PhD, bKyung-Ho Kim, DDS, MSD, PhD, c and Chooryung Chung, DDS, PhDd

aResident, Department of Orthodontics, Gangnam Severance Dental Hospital, College of Dentistry, Oral Science Research Institute, The Institute of Craniofacial Deformity, Yonsei University, Korea.
bClinical Assistant Professor, Department of Orthodontics, Gangnam Severance Dental Hospital, College of Dentistry, Oral Science Research Institute, The Institute of Craniofacial Deformity, Yonsei University, Korea.
cProfessor, Department of Orthodontics, Gangnam Severance Dental Hospital, College of Dentistry, Oral Science Research Institute, The Institute of Craniofacial Deformity, Yonsei University, Korea.
dAssistant Professor, Department of Orthodontics, Gangnam Severance Dental Hospital, College of Dentistry, Oral Science Research Institute, The Institute of Craniofacial Deformity, Yonsei University, Korea.

Correspondence to: Chooryung Chung. Department of Orthodontics, Gangnam Severance Dental Hospital, 712 Eonjuro, Gangnam-gu, Seoul 135-720, Korea. +82 2 2019 3567; Email: crchung@yuhs.ac

Received: May 22, 2010; Revised: July 5, 2010; Accepted: July 19, 2010

Abstract

Objective

The aim of this study was to evaluate the occlusal force and contact area and to find its associating factors in Koreans.

Methods

Occlusal force and contact area in maximum intercuspation were measured using the Dental Prescale® system in 651 subjects (15 with normal occlusion, 636 with various malocclusions divided into subgroups according to the skeletal pattern, Angle's molar relationship, age and gender).

Results

Occlusalforce of the normal occlusion group (744.5 ± 262.6 N) was significantly higher than those of the malocclusion group (439.0 ± 229.9 N, p < 0.05). Occlusal force was similar regardless of differences in ANB angle or Angle's molar classification, however the increase in vertical dimension significantly reduced occlusal force (p < 0.05).

Conclusions

Occlusal force was significantly lower in the malocclusion group compared to the normal occlusion group, and in females compared to males, but it was not affected by age, antero-posterior skeletal pattern or molar classification. Although a hyperdivergent facial pattern indicated lower occlusal force compared to a hypodivergent facial pattern, the differences in skeletal pattern were not the primary cause of its decrease, but a secondary result induced by the differences in occlusal contact area according to the facial pattern.

Keywords: Occlusal force, Contact area, Maxillofacial skeletal pattern

Article

Original Article

Korean J Orthod 2010; 40(5): 304-313   https://doi.org/10.4041/kjod.2010.40.5.304

First Published Date October 31, 2010, Publication Date October 31, 2010

Copyright © The Korean Association of Orthodontists.

Comparisons of occlusal force according to occlusal relationship, skeletal pattern, age and gender in Koreans

Hye-Rim Yoon, DDS, MSD, aYoon-Jeong Choi, DDS, MSD, PhD, bKyung-Ho Kim, DDS, MSD, PhD, c and Chooryung Chung, DDS, PhDd

aResident, Department of Orthodontics, Gangnam Severance Dental Hospital, College of Dentistry, Oral Science Research Institute, The Institute of Craniofacial Deformity, Yonsei University, Korea.
bClinical Assistant Professor, Department of Orthodontics, Gangnam Severance Dental Hospital, College of Dentistry, Oral Science Research Institute, The Institute of Craniofacial Deformity, Yonsei University, Korea.
cProfessor, Department of Orthodontics, Gangnam Severance Dental Hospital, College of Dentistry, Oral Science Research Institute, The Institute of Craniofacial Deformity, Yonsei University, Korea.
dAssistant Professor, Department of Orthodontics, Gangnam Severance Dental Hospital, College of Dentistry, Oral Science Research Institute, The Institute of Craniofacial Deformity, Yonsei University, Korea.

Correspondence to: Chooryung Chung. Department of Orthodontics, Gangnam Severance Dental Hospital, 712 Eonjuro, Gangnam-gu, Seoul 135-720, Korea. +82 2 2019 3567; Email: crchung@yuhs.ac

Received: May 22, 2010; Revised: July 5, 2010; Accepted: July 19, 2010

Abstract

Objective

The aim of this study was to evaluate the occlusal force and contact area and to find its associating factors in Koreans.

Methods

Occlusal force and contact area in maximum intercuspation were measured using the Dental Prescale® system in 651 subjects (15 with normal occlusion, 636 with various malocclusions divided into subgroups according to the skeletal pattern, Angle's molar relationship, age and gender).

Results

Occlusalforce of the normal occlusion group (744.5 ± 262.6 N) was significantly higher than those of the malocclusion group (439.0 ± 229.9 N, p < 0.05). Occlusal force was similar regardless of differences in ANB angle or Angle's molar classification, however the increase in vertical dimension significantly reduced occlusal force (p < 0.05).

Conclusions

Occlusal force was significantly lower in the malocclusion group compared to the normal occlusion group, and in females compared to males, but it was not affected by age, antero-posterior skeletal pattern or molar classification. Although a hyperdivergent facial pattern indicated lower occlusal force compared to a hypodivergent facial pattern, the differences in skeletal pattern were not the primary cause of its decrease, but a secondary result induced by the differences in occlusal contact area according to the facial pattern.

Keywords: Occlusal force, Contact area, Maxillofacial skeletal pattern