IADR Abstract Archives
Bone Dimensions of Oligodontia Patients: a Case-Control Study
Objectives: Oligodontia (OD) is a rare developmental dental anomaly characterized by agenesis of at least six permanent teeth. Affected patients require functional and esthetic rehabilitation. Placement of dental implants can be difficult due to the alveolar bone morphology. The purpose of this retrospective case-control study was to determine whether the bone volume of the maxilla and mandible are altered in OD patients compared to controls.
Methods: CBCTs of 53 adult OD patients (40 maxillary, 32 mandibular) were analyzed and compared with those of 82 (51 maxillary, 31 mandibular) age- and sex-matched controls. Alveolar bone height and thickness at 3, 6, 9 and 12mm depth were evaluated at every dental site (third molars excluded).
Results: For OD patients, the maxillary areas with permanent teeth demonstrated decreased bone height for incisive-canine teeth (17,1±3,0mm vs 19,2±3,9mm, p<0.001). Bone thickness was significantly reduced in all areas. In edentulous sites, height was reduced in the incisive-canine area (15,0±4,1mm vs 19,4±4,4mm, p<0.001) and bone thickness was significantly decreased in the premolar and molar area. In mandibular areas with permanent teeth, a decrease in bone height was observed for OD patients for both incisive-canine (28,5±4,1mm vs 32,3±3,2mm, p<0.001) and premolar areas (29,9±3,1mm vs 27,8±4,0mm, p<0.001). Bone thickness was significantly reduced in the incisive-canine area at 3 (p<0.001), 6 (p<0.01), and 12 mm (p<0.001) depth. In edentulous sites, every depth revealed a significant decrease in thickness.
Within the OD group, maxillary and mandibular bones were significantly thicker when permanent or temporary teeth were persistent in all areas.
Conclusions: Contrasted with controls, OD patients appeared to have reduced bone volume. Since the absence of teeth in OD patients may lead to this volume deficit of the maxilla and the mandible, it may be beneficial to keep temporary teeth functional to limit alveolar bone resorption.
Methods: CBCTs of 53 adult OD patients (40 maxillary, 32 mandibular) were analyzed and compared with those of 82 (51 maxillary, 31 mandibular) age- and sex-matched controls. Alveolar bone height and thickness at 3, 6, 9 and 12mm depth were evaluated at every dental site (third molars excluded).
Results: For OD patients, the maxillary areas with permanent teeth demonstrated decreased bone height for incisive-canine teeth (17,1±3,0mm vs 19,2±3,9mm, p<0.001). Bone thickness was significantly reduced in all areas. In edentulous sites, height was reduced in the incisive-canine area (15,0±4,1mm vs 19,4±4,4mm, p<0.001) and bone thickness was significantly decreased in the premolar and molar area. In mandibular areas with permanent teeth, a decrease in bone height was observed for OD patients for both incisive-canine (28,5±4,1mm vs 32,3±3,2mm, p<0.001) and premolar areas (29,9±3,1mm vs 27,8±4,0mm, p<0.001). Bone thickness was significantly reduced in the incisive-canine area at 3 (p<0.001), 6 (p<0.01), and 12 mm (p<0.001) depth. In edentulous sites, every depth revealed a significant decrease in thickness.
Within the OD group, maxillary and mandibular bones were significantly thicker when permanent or temporary teeth were persistent in all areas.
Conclusions: Contrasted with controls, OD patients appeared to have reduced bone volume. Since the absence of teeth in OD patients may lead to this volume deficit of the maxilla and the mandible, it may be beneficial to keep temporary teeth functional to limit alveolar bone resorption.