A survey of 3,874 routine full-mouth radiographs: I. A study of retained roots and teeth

Department of Oral Pathology, Dental School of the University of Oregon. Portland, Orc., USA
Oral Surgery Oral Medicine Oral Pathology 09/1961; 14(8):916-924. DOI: 10.1016/0030-4220(61)90003-2


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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    • "According to Andreasen et al, impaction of mandibular M3 varies from 18% to 32% in different populations.13 This rate was also estimated by Dachi and Howell as 17.5% and 21.9% for mandibular and maxillary M3s, respectively.14 In addition, in a recent study, Breik and Grubor showed a rate of 58.76% for mandibular M3 impaction in Melbourne, Australia.2 "
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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. DOI:10.5624/isd.2014.44.1.61
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    ABSTRACT: In a comprehensive study of 3,874 routine full-mouth radiographs, the following findings concerning impacted teeth were noted: 1.1. The incidence of patients with at least one impacted tooth was 16.7 per cent.2.2. The teeth most often impacted, in order of frequency, were the maxillary third molar, the mandibular third molar, the maxillary cuspid, and the mandibular premolars.3.3. The incidence of impaction was 21.9 per cent for maxillary third molars and 17.5 per cent for mandibular third molars.4.4. The incidence of impaction among maxillary cuspids was 0.92 per cent.5.5. No sex differences were noted in the impaction of third molars, but maxillary cuspid impactions were found more frequently in female patients than in male patients.6.6. No statistically significant predisposition toward bilateral impaction was noted among third molars, while a definite tendency toward unilateral impaction was found in maxillary cuspids.7.7. Thirty-seven per cent of mandibular and 15 per cent of maxillary impacted third molars were found to have areas of radiolucency around their crowns.
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