A survey of 3,874 routine full-mouth radiographs: I. A study of retained roots and teeth
ABSTRACT A comprehensive study of 3,874 routine full-mouth radiographs yielded the following findings concerning retained roots and teeth: 1.1. The incidence of retained roots discovered in routine full-mouth radiographs of all types of patients was close to 20 per cent. Twice as many roots are retained in the maxilla as in the mandible, and over six times as many are retained in posterior areas as in anterior areas.2.2. The incidence of retained roots in edentulous jaws was close to 24 per cent, and the incidence of retained and embedded teeth was 2.6 per cent.3.3. The over-all incidence of radiolucencies associated with retained roots was over 50 per cent.4.4. Of these retained roots, those exposed to the oral cavity were involved with radiolucent areas in 81 per cent of the cases, while roots lying beneath the surface or completely encased in bone had radiolucent areas around them in 20 per cent of the cases.5.5. The size of the retained root had no influence on the incidence of associated radiolucent areas.6.6. There was no difference in the numbers of radiolucencies between roots found in the maxilla and those found in the mandible, but a markedly higher incidence of involvement was noted in anterior areas as compared to posterior areas.7.7. The incidence of retained roots of deciduous teeth which remain in the jaws is extremely small (1.2 per cent).8.8. Retention of deciduous teeth occurred in one out of every sixty-three patients. The most frequently retained deciduous tooth was the maxillary cuspid.The significance of these findings is discussed, and the need for comprehensive radiographic examination of all patients is emphasized.
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ABSTRACT: This study was performed to evaluate the position of impacted mandibular third molars in different skeletal facial types among a group of Iranian patients. A total of 400 mandibular third molars in 200 subjects with different types of facial growth were radiographically investigated for their positions according to their types of facial growth on the basis of the β angle. The subjects were divided into three groups (class I, II, and III) according to ANB angle, representing the anteroposterior relationship of the maxilla to the mandible. Meanwhile, the subjects were also divided into three groups (long, normal, and short face) according to the angle between the stella-nasion and mandibular plane (SNGoGn angle). ANOVA was used for statistical analysis. The mean β angle showed no significant difference among class I, II, and III malocclusions (df=2, F=0.669, p=0.513). The same results were also found in short, normal, and long faces (df=1.842, F=2, p=0.160). The mesioangular position was the most frequent one in almost all of the facial growth patterns. Distoangular and horizontal positions of impaction were not found in the subjects with class III and normal faces. In the long facial growth pattern, the frequency of vertical and distoangular positions were not different. In almost all of the skeletal facial types, the mesioangular impaction of the mandibular third molar was the most prevalent position, followed by the horizontal position. In addition, β angle showed no significant difference in different types of facial growth.Imaging science in dentistry. 03/2014; 44(1):61-5.
Article: Oral Hygiene & Health08/2014; 2.
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ABSTRACT: There is a resurgence of interest in coronectomy for the management of mandibular third molars because it has a low risk of injury to the inferior dental nerve. However, there is concern that the root that is left in place will eventually become a source of infection. We describe the histological evaluation of 26 consecutive symptomatic coronectomy roots in 21 patients. All roots had vital tissue in the pulp chamber and there was no evidence of periradicular inflammation. Persistent postoperative symptoms related predominantly to inflammation of the soft tissue, which was caused by partially erupted roots or failure of the socket to heal.British Journal of Oral and Maxillofacial Surgery 05/2014; · 1.13 Impact Factor