Abstract
This study aimed at grasping the influence which treatment during the primary dentition period exerts on the root resorption and shedding of the mandibular primary first molar, calcification and eruption stage of successional permanent teeth (mandibular permanent first premolar). To a certain the relationship of this, we reviewed clinical records, plaster models, orthopantomography, dental X-ray films of treated deciduous teeth of 4,5,6 year-old outpatients who had come to the Department of Pediatric Dentistry, Osaka Dental University. As a result we observed following conclusions.
1) The root resorption of the mandibular primary first molars made slower progress in the order of the root canal filled ones after infected root canal treatment, root canal filled ones after pulpectomy under local anesthesia, ones vital pulp amputation, restored ones with normal roots, and normal primary molars.
2) The shedding of the deciduous teeth was in the same order.
3) When it come to the calcification of successional permanent teeth, though calcification of the germs of successional permanent first premolars temporally increases, different effects between the cases of root canal filled deciduous teeth after infected root canal treatment and those of early exodontias were not found.
4) As far as the eruption time is concerned, early exodontias causes eruption of successional premolar earlier and late exodontias causes early eruption. The trends in the effect of other treatments were same as for root resorption deciduous roots.
