Odontología

Páginas: 13 (3054 palabras) Publicado: 23 de agosto de 2010
J Appl Oral Sci. 2009;17(5):481-6
www.fob.usp.br/jaos or www.scielo.br/jaos

A SCANNING ELECTRON MICROSCOPIC STUDY OF THE PATTERNS OF EXTERNAL ROOT RESORPTION UNDER DIFFERENT CONDITIONS
Ravindran SREEJA1, Chaudhary MINAL2, Tumsare MADHURI3, Patil SWATI4, Wadhwan VIJAY5

1- B.D.S, III year postgraduate, Department of Oral Pathology and Microbiology, Sharad Pawar Dental College, Maharashtra,India. 2- M.D.S (Oral and Maxillofacial Pathology and Microbiology), M.D.S (Orthodontics and Dentofacial Orthopedics), Professor and Head of Department, Department of Oral Pathology and Microbiology, Sharad Pawar Dental College, Maharashtra, India. 3- M.D.S (Oral and Maxillofacial Pathology and Microbiology), Professor, Department of Oral Pathology and Microbiology, Sharad Pawar Dental College,Maharashtra, India. 4- M.D.S (Oral and Maxillofacial Pathology and Microbiology), Assistant Professor, Department of Oral Pathology and Microbiology, Sharad Pawar Dental College, Maharashtra, India. 5- M.D.S (Oral and Maxillofacial Pathology and Microbiology), Reader, Department of Oral Pathology and Microbiology, Sharad Pawar Dental College, Maharashtra, India. Corresponding address: Dr. RAVINDRAN.SREEJA - III rd year P.G Student - Department of Oral Pathology and Microbiology - Sharad Pawar Dental College - Sawangi (Meghe) - Wardha-442004 - Maharashtra - India - Phone: 09960811170 - e-mail: sri_adorned@rediffmail.com Received: July 9, 2008 - Modification: August 31, 2008 - Accepted: October 15, 2008

ABSTRACT
bjective: The aim of this study was to examine if there are qualitativedifferences 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 atmagnifications 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 showedevidence 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 oflight 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 rootresorption among the studied groups of primary and permanent teeth under physiologic and pathological conditions. Key words: Root resorption. Scanning electron microscopy.

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INTRODUCTION
The hard tissue of human teeth is composed of enamel, cementum and dentin. Multinucleated cells called odontoclasts resorb root dental hard tissues9.The resorption of hard tissue in primary teeth is a normalphysiologic phenomenon that leads to their exfoliation and ultimately the transition to permanent dentition. The hard tissues of permanent teeth, on the other hand, are not resorbed under normal conditions and resorption is a pathologic process. This pathologic root resorption process has been broadly classified based on the site of occurrence into external or internal resorption2. Several causes...
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