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Abstract The objective of this study was to compare four different obturation techniques in obturating artificially created internal resorptive defects. Thirty extracted, human maxillary central incisor teeth were collected for the study. Access cavity was prepared in each tooth. The teeth were instrumented to apical size 50. The roots were sectioned horizontally 7 mm from the apex. Semicircular cavities were created using a No 6 round diamond bur. Cyanocrylate glue was used to join the sectionstogether. The teeth were radiographed to visualize the internal resorption cavity. The teeth were randomly divided into three groups (n=10) according to obturation technique; standard lateral condensation carries based (Thermafill) orthermoplastized gutta perchae using Obtura.
After obturation both mesio distal and bucco lingual radiographs were taken to access the quality of obturation. Obtura group showed significantly complete obturation in all the ten samples followed by samples oburated with thermafill while lateral condensation showed the least obturation of the resorptive defect.
Key Words: Obturation, Internal resorption, Obtura, Thermafil, lateral condensation.
INTRODUCTION One of the major goals of successful root canal therapy is to achieve total obliteration of the root canal space using a dimensionally stable and biologically compatible filling material. The normal root canal anatomy may be altered by pathological processes making the task very difficult and at times impossible to achieve by normal methods of obturation. One of such conditions is internal resorption, which presents as an irregular defect in the root canal. Internal resorption is an inflammatory process initiated within the pulp space with loss of dentin and possible invasion of the cementum.1 Resorption phenomena have been described for many years. Most of the articles on this subject focus on external root resorptions, while the internal resorptions also represent a challenge for the practitioner. The etiology is not very clear, however it has been cited that dental trauma and inflammatory alteration in dental pulp after pulp capping or pulpotomy as risk factors.2 Kinomoto et al (2002) adds that it can also happen due to infection of dental pulp or extreme heat use during obturation. The occurrence of internal resorption has been estimated to be between 0.01% and 55%, depending on the inflammatory status of the pulp. The diagnosis of these lesions is difficult to establish and the conventional X-ray...