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J Korean Acad Pediatr Dent. 2012;39(4): 390-396.
Jung-Hwa Jung, Young-Jin Kim, Hyun-Jung Kim, Soon-Hyeun Nam
Department of Pediatric Dentistry, School of Dentistry, Kyungpook National University
Corresponding Author: Soon-Hyeun Nam ,Tel: 053-600-7201, Email: shnam@knu.ac.kr
Received: July 23, 2012;  Accepted: August 20, 2012.
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Infraocclusion is defined as tooth whose relative occlusal movement was blocked during the period of active eruption due to ankylosis and so on. Then infraoccluded tooth remains under the occlusal plane composed by adjacent structures showing normal eruption patterns. Untreated infraocclusion may cause: prolonged retention of infraoccluded teeth; extrusion of apposed teeth; destruction of periodontal tissues by occlusal force and food packing; increased sensitivity for dental caries; and disturbances on eruption pathway of succedaneous teeth. Therefore, periodic check-ups and proper treatments are required. There are many treatment options on infraoccluded deciduous molars such as periodic observation, conservative method, restoration and space regaining with extraction of the teeth. The choice of treatment may depend on the presence of succedaneous teeth, time of diagnosis and degree of infraocclusion. In this case report, three patients showing displacement of the second premolars due to infraocclusion of upper second primary molars, were treated by means of space regaining with removable orthodontic appliances and extraction of ankylosed primary molars. All malpositioned permanent premolars in the 3 cases showed ordinary eruption pathways after treatment.
Keywords: Infraocclusion | Ankylosis | Tooth germ displacement | Eruption guidance
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