A scanning electron microscopic study of the patterns of external root resorption under different conditions

Abstract

Objective:The aim of this study was to examine if there are qualitative differences in the appearance of external root resorption patterns of primary teeth undergoing physiologic resorption and permanent teeth undergoing pathological root resorption in different conditions.Material and Methods:A total of 40 teeth undergoing external root resorption in different conditions were divided into 4 groups and prepared for examination under scanning electron microscopy at magnifications ranging from 20x to 1000x. Group I: 10 primary molars exfoliated due to physiologic root resorption; Group II: 10 permanent teeth with periapical granulomas showing signs of resorption; Group III:10 permanent teeth therapeutically extracted during the course of orthodontic therapy with evidence of resorption, and Group IV: 10 permanent teeth associated with odontogenic tumors that showed evidence of resorption.Results:In Group I, the primary teeth undergoing resorption showed smooth extensive and predominantly regular areas reflecting the slow ongoing physiologic process. In Group II, the teeth with periapical granulomas showed the resorption was localized to apex with a funnel shaped appearance in most cases. Teeth in Group III, which had been subjected to a short period of light orthodontic force, showed the presence of numerous resorption craters with adjoining areas of cemental repair in some cases. Teeth associated with odontogenic tumors in Group IV showed many variations in the patterns of resorption with extensive loss of root length and a sharp cut appearance of the root in most cases.Conclusion:Differences were observed in the patterns of external root resorption among the studied groups of primary and permanent teeth under physiologic and pathological conditions.

Asymmetrical root resorption in primary mandibular molars: Prevalence and determinants factors

“…[10] Studies have reported that root resorption in primary teeth depends on the germ of permanent successor as well as other factors. [1,[5][6][7][8] Furthermore, the morphological relationship between the roots of the primary teeth and the crowns of the permanent successors should be considered. [2] In this study, a situation in which the germ of the permanent successor completely occupied only one of the roots of the primary tooth was considered atypical resorption, which may explain the greater prevalence of asymmetrical root resorption in the primary molars of children aged 8-12 years, as primary molars undergo a natural exfoliation process in this period, in comparison to those aged 3-7 years.…”

“…These situations of root resorption were associated with areas of periradicular bone rarefactions and tooth decay with pulp involvement, which is in agreement with fi ndings described in previous studies. [1,6,7] It is not possible to identify the initial moment of root resorption clinically or through radiographs. Only advanced stages of root resorption are seen in radiographic exams.…”

“…[1] Asymmetrical root resorption, also known as ectopic or atypical resorption, is advanced resorption in a single root; the origin of which may be physiological or pathological. [2][3][4] The main predictors of root resorption in primary molars are occlusal trauma, necrotic pulp, tumor, child's age, caries with pulp involvement, the absence of restoration, presence of pulpotomy or pulpectomy.…”

Current Status of Low Intensity Pulsed Ultrasound for Dental Purposes

“…On the other hand, the hard tissues of permanent teeth are not resorbed under healthy conditions and the resorption is thus considered a pathologic process [72]. Different causes have been attributed to the root resorption process including pressure, inflammation, neoplastic process and systemic conditions [73]; however, the biological phenomena underlying root resorption are still not completely understood. Tooth root resorption is regarded as a major problem encountered after tooth replantation and orthodontic tooth movement.…”

Scanning Electron Microscopy Evaluation of Dental Root Resorption Associated With Granuloma

“…Some works showed crater-like (Lomcali et al, 1996), funnel-like (Malueg et al, 1996;Sreeja et al, 2009), and irregular morphologies (Felippe et al, 2009). Some works showed crater-like (Lomcali et al, 1996), funnel-like (Malueg et al, 1996;Sreeja et al, 2009), and irregular morphologies (Felippe et al, 2009).…”