Suzuki Yuji, Saitoh Katsuhiko, Imamura Ryutaroh, Ishii Kaori, Negishi Shinichi, Imamura Ryuichi, Yamaguchi Masaru, Kasai Kazutaka
Department of Orthodontics, School of Dentistry, Nihon University, Matsudo, Chiba, Japan.
Department of Orthodontics, School of Dentistry, Nihon University, Matsudo, Chiba, Japan.
Am J Orthod Dentofacial Orthop. 2017 Jun;151(6):1139-1147. doi: 10.1016/j.ajodo.2016.11.023.
The relationship between molar occlusion and chewing patterns was examined in subjects with laterally deviated mandibles.
Twenty-three patients with mandibular deviation from the midline (4 mm or more) and skeletal Class I (0° ≤ANB ≤4°) were divided into 2 groups: normal bite and crossbite. The chewing pattern was classified as normal, reversed, or crossover.
The normal bite group had a normal chewing pattern on the affected side 100% of the time and a reversed chewing pattern on the affected and unaffected sides 0% and 7.2% of the time, respectively. Additionally, the normal bite group showed no evidence of a crossover chewing pattern and also had significantly less axial inclination of the mandibular teeth on the affected side compared with the crossbite group; lingual inclination was also evident. The crossbite group had a normal chewing pattern on the affected and unaffected sides 0% and 55.6% of the time, respectively, and reversed and crossover chewing patterns on the affected side 55.6% and 44.4% of the time, respectively.
A normal chewing pattern tends to result in lingual axial inclination of the mandibular molars on the affected side, as well as a more consistent chewing pattern.
