乳臼歯の早期喪失が永久歯列不正咬合の成立におよぼす影響について

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The Effect of premature loss of deciduous molars on the development of malocclusion in permanent dentition was examined. The material was 180 pairs of dental casts of permanent dentiton, 122 pairs of which were obtained through the dental health program for school children in an area without dentists, Koromogawa, Iwate, where cavity filling and extraction were the only therapeutic measures used at the annual visit by the Tohoku University group. The other 58 pairs of casts were obtained from children whose deciduous molars were sufficiently taken care of at the Lion Family Dental Center, Nagoya.<BR>From these materials, the casts of 20 children who had lost more than 7 deciduous molars prematurely were selected as the lost group. The casts of 49 children who had preserved all the deciduous molars normally were selected as the preserved group. No significant difference was found in the frequency of malocclusion of permanent dentition between the two groups. No difference was found in the frequency of functional factors for malocclusion in the two groups.<BR>As for the tooth to denture base discrepancy, the material was divided into two groups: the discrepancy and the non-discrepancy groups. Significant difference was found in the frequency of malocclusion in permanent dentition between the two groups with a risk of less than 0.1%.<BR>Conclusion was that the premature loss of deciduous molars would have no significant effect upon the development of malocclusion of permanent dentition, but congenital etiological factors such as tooth to denture base discrepancy would have significant effect upon it. Accordingly, the extraction of advanced carious deciduous molars might be an affirmative therapeutic measure, especially from the standpoint of efficiency of treatment and sufficiency of dental care for school children.<BR>The information from such a public health program should also be applied to clinical dentistry, especially for the developmental stage of dentition.

乳臼歯の早期喪失が永久歯列不正咬合の成立におよぼす影響について

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