Journal List > Korean J Orthod > v.40(5) > 1043636

Yoon, Choi, Kim, and Chung: Comparisons of occlusal force according to occlusal relationship, skeletal pattern, age and gender in Koreans

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

Occlusal force 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.

Figures and Tables

Fig. 1
Correlation between occlusal force and contact area (A, normal occlusion group; B, malocclusion group).
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Table 1
Numbers of subjects by age and gender in malocclusion group
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Table 2
Comparison of occlusal force and contact area between normal occlusion and malocclusion groups
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SD, Standard deviation; Sig, significance; *p < 0.001.

Table 3
Comparison of occlusal force and contact area according to gender (a) and different age groups (b)
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SD, Standard deviation; Sig, significance; NS, not significant; *p < 0.05; p < 0.001; different letters mean statistical difference between a and b.

Table 4
Comparison of occlusal force and contact area among different antero-posterior relationships of the maxilla and the mandible
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A-P, Antero-posterior; SD, standard deviation; Sig, significance; NS, not significant.

Table 5
Comparison of occlusal force and contact area among different Angle's classification of the first molar
kjod-40-304-i005

SD, Standard deviation; Sig, significance; NS, not significant.

Table 6
Comparison of occlusal force and contact area among different vertical relationships (a. mandibular plane angle, b. gonial angle)
kjod-40-304-i006

SD, Standard deviation; Sig, significance; *p < 0.05; p < 0.001; different letters mean statistical difference between a and b.

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