A study of model and cephalograms in elderly persons over 80 years old with at least 20 teeth

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  • 8020 達成者の口腔内模型および頭部 X 線規格写真分析結果について

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The purpose of this study was to identify occlusal and maxillofacial status of elderly Japanese with many remaining teeth. Chiba City has been holding Annual "Long Life-Good Teeth" Contest to acknowledge the citizens aged 80 or older with 20 or more remaining teeth. This study included 41 applicants for the 1998 and 1999 contests. Each subject was asked to fill out a questionnaire and undergo an intraoral examination, during which intraoral and facial photographs, radiographs and impressions were taken. The subjects whose mean age was 82 years 5 months retained an average of 25.3 teeth. No difference was observed in age or number of preserved teeth between the males and females. Anteroposterior occlusal relationship was characterized by maxillary protrusion in 78.9%, normal overjet in 21.1%, and anterior crossbite in 0%. Vertically, deep bite was noted in 34.2%, normal overbite in 65.8%, and open bite in 0%. Most of the subjects had either Angle Class I (64.6%) or Class II (25.0%) canine relationship. Only 4.9% of the subjects had upper anterior crowding. Lower anterior crowding was observed in 31.7%, though not severe. Maxillofacial morphology was within a normal range with a small tendency toward maxillary protrusion associated with a posteroinferiorly positioned mandible. These results indicate that Japanese who attained the goal of 8020 have relatively good occlusal and maxillofacial forms.


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