Indications for autotransplantation Autotransplantation is defined as the transplantation of embedded, impacted or erupted teeth from one site into extraction sites or surgically prepared sockets in the same person. 3 Autotransplantation has been used to replace missing teeth and teeth of poor prognosis. 4-10 The etiology of tooth agenesis is largely unknown. Vastardis 11 presented supporting evidence of a genetic etiology for tooth agenesis. He also reported the most frequently absent teeth are third molars followed by mandibular second premolars. 11 There are reports of associations of tooth agenesis and other congenital tooth anomalies to certain malocclusions. 12 The treatment plan for missing teeth cases should be based on a comprehensive evaluation of the age, occlusion, and space requirements of the patient as well as the size and shape of the adjacent teeth. 13 If extraction has been planned in the maxilla for the correction of crowding or reduction of a overjet, a maxillary premolar may be transplanted to the second premolar site in the mandible (Fig 1). In most cases, the tooth or teeth to be extracted due to caries or periodontal disease are the first molars. In this case, transplantation of third molars to the first molar site may be considered. 4,6,10 Maxillary incisors are the teeth most frequently involved in trauma. Zachrisson 14 reported autotransplantation of the developing mandibular second premolar to the avulsed maxillary incisors. Autotransplantation may provide a simplified and faster treatment option for patients with ectopically positioned teeth. The optimal treatment for ectopically positioned
Objectives:
To evaluate the condyle-fossa relationship in adolescents with various skeletal patterns using cone-beam computed tomography (CBCT).
Materials and Methods:
CBCT images obtained in 120 adolescent patients were used for this study. The patients were divided into 3 groups according to 3 criteria: (1) age (early, middle, and late adolescence); (2) facial height ratio or Jarabak quotient (hyperdivergent, normodivergent, and hypodivergent); and (3) ANB classification (Class I, Class II, and Class III). Temporomandibular joint space (TMJS: AS, anterior space; SS, superior space; PS, posterior space; MS, medial space; LS, lateral space), width and depth of the condyle (MLT, mediolateral thickness; APT, anteroposterior thickness), articular slope (ArS) and vertical height of the fossa (VHF) were measured and compared using CBCT.
Results:
Differences in condyle-fossa relationships were not significantly different between male and female adolescents, but were significantly different (P < .05) between left and right sides. The mean values showed no statistical differences according to age and skeletal pattern. Most measurements in the sagittal view showed that SS was the greatest, and the mean ratio of AS to SS to PS was 1.00 to 1.27 to 1.19, respectively. The mean values of coronal MS and LS were not significantly different.
Conclusions:
There were almost no statistical differences in the TMJS in adolescents across various factors except between left and right sides.
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