RESUMEN
Considering probable incidence of pathological changes in the follicles of impacted teeth, this study is conducted to evaluate pericoronal radiolucency of impacted third molars. In this cross-sectional study, widths of follicular spaces of 201 impacted third molars were measured on panoramic radiographs. Under local anesthesia, the teeth along with the dental follicles were surgically removed. After routine procedure, they histopathological were examined. After evaluating 201 dental follicles it was observed that, 50.7% of cases [102 cases] showed pathological changes and all of them were dentigerous cysts. Incidence of cystic changes in the follicles of third molars of patients aged 21 years and above, is 1.465 times more than patients who were under 21 years old. Also in dental follicles of lower third molars, the incidence of pathological changes was 1.957 times more than maxilla. Cystic changes in the evaluation of follicular widths up to 1.5 mm, was observed in 48% of cases, up to 2 mm, in 73.5% of cases, up to 2.5 mm, in 87.2% of cases and up to 3 mm, in 92.1% of cases. It seems that occurrence of cystic changes in dental follicles increases with increase in age and width of follicular space. However, considering the high incidence of cystic changes in pericoronal radiolucency around the impacted third molars, this study supports the prophylactic removal of impacted third molars
RESUMEN
Statement of the Problem: Determining the crown-root ratio is crucial in many dental clinical decisions. There are no reliable data presented for Iranian population
Purpose: The aim of this study was to assess the root-crown ratio of permanent teeth with regards to the relationship of gender and jaw type using panoramic radiographs. The reliability of method was also assessed
Materials and Method: The crown and root lengths of teeth were measured by a digital caliper on panoramic radiographs of 185 individuals except for the third molars. A total of 1994 teeth was studied and 50.8% of the teeth belonged to males and 49.2% belonged to females. The modified Lind method was applied
Results: The highest mean root-crown ratios in both arches of both genders were obtained in the second premolars, followed by the first premolars and canines. In both genders, the lowest root-crown ratios were found in the maxillary central incisors. In male patients, the mean root-crown ratio was higher [p= 0.003] than that of females. Using Bland-Altman analysis, a non-significant difference of 0.006 [95% CI: -0.012-0.024] and 0.0002 [95% CI: -0.011-0.011] were found for intra-observer and inter-observer agreement, respectively
Conclusion: Assessment of the root-crown ratio in permanent dentition could be performed on panoramic radiographs with acceptable reproducibility in an Iranian Population. Considering observed differences, our findings suggest that for the accurate assessment, this ratio must be calculated for male and female patients and also for the upper and lower jaws, separately