Comparison of dynamic occlusal contacts during chewing between children with primary dentition and normal adult females |
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| Institution: | 1. Division of Pediatric Dentistry, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan;2. Okamoto Pedodontics and Orthodontics Clinic, Nishinomiya, Japan;3. Department of Pediatric Dentistry, Kagashima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan;1. Faculty of Dentistry, Mansoura University, Mansoura, Egypt;2. Faculty of Dentistry, Thamar University, Yemen;1. Dental Department, Makarak Hospital, Kanchanaburi, Thailand;2. Department of Operative Dentistry and Endodontics, Faculty of Dentistry, Mahidol University, Bangkok, Thailand;3. Department of Oral Biology, Faculty of Dentistry, Mahidol University, Bangkok, Thailand;4. Department of Pediatric Dentistry, Faculty of Dentistry, Mahidol University, Bangkok, Thailand;1. Department of Pediatric & Preventive Dentistry, JSS Dental College & Hospital, JSS Academy of Higher Education & Research, Mysuru, India;2. Department of Oral Pathology & Microbiology, JSS Dental College & Hospital, JSS Academy of Higher Education & Research, Mysuru, India;1. Department of Dentistry for Children and Disabled Persons, Graduate School of Dental Medicine, Hokkaido University, Kita-13, Nishi-7, Kita-ku, Sapporo, 060-8586, Japan;2. Department of Dentistry for Cellular and Molecular Pharmacology, Graduate School of Dental Medicine, Hokkaido University, Kita-13, Nishi-7, Kita-ku, Sapporo, 060-8586, Japan |
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| Abstract: | ObjectiveInvestigation of dynamic occlusal contacts when food particles are being pulverized during chewing is of interest for many researchers and clinicians. However, measurement of dynamic occlusal contacts during chewing is difficult, and differences between children and adults have not been established. The purpose of this study is to test the hypothesis that dynamic occlusal contacts of children differ from those of adult females.Subjectsand methods: Thirteen healthy children (4–6 years of age; mean age 5 years, 7 months) and thirteen adult females (18–26 years of age; mean age 20 years, 7 months) with normal occlusion participated in this study. Occlusal contact area (OCA) was estimated with a developed measurement system combining 3-D digitization of tooth shape with 3-D tracking of mandibular movements (1) during the closing stroke, (2) at the maximum closing position (MCP), and (3) during the opening stroke. OCA at static maximum intercuspation (ICP) was also estimated.ResultsAt the MCP, the children's OCA was less than 76.4% of the contact area seen at the ICP. The timing of maximum OCA in children was shifted more towards the opening stroke compared with adults, and the OCA remained greater during opening in children than adults. The occurrence of the MCP was less stable in children than in adults, both between subjects and within subjects.ConclusionsWe conclude that both the amount of OCA and the pattern of occlusal contacts during the occlusal phase of chewing completely differ between children and adult females. |
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| Keywords: | Occlusal contact area Mastication Children Development |
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