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Infraocclusion of primary molars: a histologic study
Author(s) -
KUROL JÜRI,
MAGNUSSON BENGT C.
Publication year - 1984
Publication title -
european journal of oral sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.802
H-Index - 93
eISSN - 1600-0722
pISSN - 0909-8836
DOI - 10.1111/j.1600-0722.1984.tb01298.x
Subject(s) - ankylosis , molar , medicine , dentistry , periodontium , orthodontics , mandible (arthropod mouthpart) , dental cementum , cementum , biology , dentin , botany , genus
– In order to analyze the occurrence and character of ankylosis in primary molars in infraocclusion, 102 primary molars, 62 in infraocclusion and 40 in normal position, in children aged 3–17yr, were studied histologically. Ankylosis was demonstrable in most of the infraoccluded teeth while ankylosis was not found in teeth with normal positions. The ankylosis was always located at the inner root surface. Progression of the resorption of the root with age was seen in both group of teeth. In teeth of younger children, in contrast to teeth of older children, the ankylosis was never found in the cervical portion of the roots. In the mandible, a thicker buccal marginal bone crest could be found in infraoccluded teeth than in teeth in normal position. Bone biopsies revealed no pathologic changes. Pulps ol infraoccluded teeth more often demonstrated degenerative changes like fibrosis and calcifications. It is suggested that ankylosis is a local phenomenon, most likely due to developmental disturbances of the periodontium, and that ankylosis in infraoccluded primary molars is not a static condition but part of an ongoing process during root resorption.