Objective: To assess the effects of different variables including implant type and thread design, bone width and height measured on cone beam computed tomography (CBCT) images, along with systemic and patient related factors on marginal bone loss around dental implants which were measured on postoperative panoramic radiographs. Methods: A total of 116 dental implants from two manufacturers were used in the study. Age, gender, history of diabetes mellitus and hypertension, smoking habit, implant thread type, implant site, length and diameter were recorded. Available alveolar bone width and height were measured on preoperative CBCT images. Marginal bone loss around dental implants was measured on the panoramic radiographs taken three months after implant placement on both mesial and distal sides. Results: There were no statistically significant differences for the measurements of marginal bone loss on both distal and mesial sides according to gender, region, jaw and implant type. While there was a significant difference between patients with and without diabetes mellitus in terms of distal marginal bone loss (p < 0.05); no significant difference was found between patients with and without diabetes mellitus for mesial marginal bone loss. The mean of marginal bone loss was 1.43 ± 0.75 mm and 1.45 ± 0.75 at the distal and mesial sides, respectively. We found statistically significant differences for alveolar width and marginal bone loss. However, no significant differences were found for the height measurements. Conclusion: Marginal bone loss increased with an increase in bone width. There were no significant differences for the measurements of marginal bone loss on both distal and mesial sides according to gender, region, jaw, and implant type.
Background To investigate whether any relationship between local alveolar bone density and maxillary canine impaction using gray values from cone beam computed tomography. Material and Methods The cone beam computed tomography images of 151 patients were retrospectively evaluated. Maxillary canine was defined as an impacted tooth when root formation was complete and the patient’s age older than 13 or the other side of the maxillary canine has completely erupted. Similarly, complete eruption was defined as the tooth in its expected occlusion and position. Using the cone beam computed tomography software, the region of interest which was 5 mm2 in area, was placed in the trabecular bone on cross sectional cone beam computed tomography images and the gray value measurements were recorded. After measuring the gray values of all the teeth, the images were grouped according to the field of view size. Comparison of the gray values of impacted and non-impacted teeth was made between images with the same field of view size. Results A total of 151 patients, 101 (66.9%) female and 50 (33.1%) male, were included in the study. The mean age of the patients was 24.94 ±13.9. In images with a 40X40 field of view, the gray values of the impacted canine teeth were higher than the gray values of the non-impacted ones and statistically significant difference was found between them ( p =0.003). However no statistically significant difference was found between the gray values of impacted and non-impacted canine teeth in 60x60 and 100x50 field of view ( p =0.197, p =0.170, respectively). Conclusions We suggest using the smallest field of view size when evaluating bone density using gray values from cone beam computed tomography images and we support the idea that the local increased bone density may influence on impaction. Key words: Cone-beam computed tomography, tooth, impacted, bone density, maxilla, image processing, computer-assisted.
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