Kurokawa Makoto, Kanzaki Hiroyuki, Tokiwa Hajime, Handa Hideho, Nakaoka Kazutoshi, Hamada Yoshiki, Kato Hitoshi, Nakamura Yoshiki
a Research Associate, Department of Orthodontics, School of Dental Medicine, Tsurumi University, Yokohama, Japan.
b Lecturer, Department of Orthodontics, School of Dental Medicine, Tsurumi University, Yokohama, Japan.
Angle Orthod. 2016 Jan;86(1):87-93. doi: 10.2319/111114-807.1. Epub 2015 Apr 22.
To clarify whether the concept of main occluding area, where hard food is initially crushed, exists in patients who have a jaw deformity.
Nineteen subjects with normal occlusion, 18 patients with mandibular prognathism, and 11 patients with mandibular prognathism who had undergone orthognathic surgery participated in this study. The main occluding area was identified by clenching Temporary Stopping. The coincidence, location of the main occluding area, and distance from the first molars to main occluding area were examined.
High coincidence of the main occluding area was obtained in all groups, signifying that the main occluding area exists even in these patients. Mandibular main occluding area was located on the first molar in all groups. Maxillary main occluding area in subjects with normal occlusion was located on the first molar. However, it was located on the second premolar and first molar in patients with mandibular prognathism, and on the first and second molars in patients with mandibular prognathism who had undergone orthognathic surgery. There was a statistically significant difference in distance from the maxillary first molar to the main occluding area among groups, but there was no difference in the distance from the mandibular first molar among groups.
The main occluding area is more stable on the mandibular first molar than the maxilla in all groups.
明确颌骨畸形患者是否存在最初用于碾碎硬食物的主要咬合区域这一概念。
19名咬合正常的受试者、18名下颌前突患者以及11名接受过正颌手术的下颌前突患者参与了本研究。通过紧咬临时阻挡物来确定主要咬合区域。检查主要咬合区域的一致性、位置以及从第一磨牙到主要咬合区域的距离。
所有组中主要咬合区域的一致性都很高，这表明即使在这些患者中也存在主要咬合区域。所有组的下颌主要咬合区域均位于第一磨牙上。咬合正常的受试者上颌主要咬合区域位于第一磨牙上。然而，下颌前突患者的上颌主要咬合区域位于第二前磨牙和第一磨牙上，接受过正颌手术的下颌前突患者的上颌主要咬合区域位于第一和第二磨牙上。各组上颌第一磨牙到主要咬合区域的距离存在统计学显著差异，但各组下颌第一磨牙到主要咬合区域的距离无差异。
在所有组中，主要咬合区域在下颌第一磨牙上比在上颌更稳定。
