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The main occluding area in normal occlusion and mandibular prognathism
Makoto Kurokawa1, Hiroyuki Kanzaki2, Hajime Tokiwa3
1a Research Associate, Department of Orthodontics, School of Dental Medicine, Tsurumi University, Yokohama, Japan.
The Angle Orthodontist
|April 23, 2015
Summary
The main occluding area, where food is initially crushed, exists in patients with jaw deformities. This primary chewing area is consistently located on the mandibular first molar across all study groups.
Area of Science:
- Dental occlusion research
- Jaw deformity biomechanics
- Masticatory function analysis
Background:
- The main occluding area is crucial for initial food crushing during mastication.
- Understanding its location and stability is vital for assessing occlusal function, especially in individuals with jaw deformities.
Purpose of the Study:
- To investigate the existence and characteristics of the main occluding area in patients with jaw deformities.
- To compare the main occluding area's location and stability in individuals with normal occlusion versus those with mandibular prognathism, both pre- and post-orthognathic surgery.
Main Methods:
- Study included 19 subjects with normal occlusion, 18 with mandibular prognathism, and 11 who underwent orthognathic surgery.
- The main occluding area was identified using Temporary Stopping material during clenching.
- Evaluated coincidence, location, and distance from first molars to the main occluding area.
Main Results:
- High coincidence of the main occluding area was observed in all groups, confirming its presence in patients with jaw deformities.
- The mandibular main occluding area consistently localized to the first molar.
- Maxillary main occluding area varied, located on the first molar in normal occlusion, but shifted to premolars/molars in prognathism and post-surgery.
Conclusions:
- The main occluding area demonstrates greater stability on the mandibular first molar compared to the maxilla across all evaluated groups.
- Findings suggest the mandibular first molar serves as a consistent reference point for primary masticatory forces, even in the presence of significant jaw deformities.
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