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Influence of the level of apical expansion of irrigation and employment ultrassonoenergizada the quality of obturation of mesial canals of mandibular molars

Grant number: 11/20347-0
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): January 01, 2012
Effective date (End): December 31, 2012
Field of knowledge:Health Sciences - Dentistry - Endodontics
Principal researcher:Marco Antonio Hungaro Duarte
Grantee:Raphaelli Porfirio
Home Institution: Faculdade de Odontologia de Bauru (FOB). Universidade de São Paulo (USP). Bauru , SP, Brazil


The cleaning of tissue debris and elimination of root canal infection provide a favorable environment for the repair of periapical lesions and favor the adequate root canal obturation. Therefore the aim of this study is to analyze the quality of endodontic fillings in mesial canals of mandibular molars in the function of apical dilation, dilating instrument to the initial diameter of 0.25 mm or diameter of 0.40 mm, and the employment of ultrason and sodium hypochlorite solution 1% in the final irrigation. It will be selected 56 mesial roots of human molars with roots intact with maximum curvature of 30 ° (Schneider), complete apex obtained through donations made by professional of molar extracted and consented to its use in research by the patient. Previously, pilot tests will be conducted using 8 roots, with two teeth per group for the training of rotary instrumentation and techniques shutters. The other 48 roots will be employed in the research. Initial radiographs will be to verify the presence of two mesial canals with separate frames. The teeth will be divided into 4 groups of 12 teeth according to the level of expansion and employment of ultrason with sodium hypochlorite 1% in the final irrigation, obeying the following: G1: # 25 without ultrasound; G2: # 40 without ultrasound; G3: # 25 with ultrasound; G4: # 40 with ultrasound. After preparation of the canals and final irrigation, the teeth will be filled with technical System B and AH Plus sealer with 0.1% rhodamine. After filling teeth, they will be held 72 hours at 37 ° C and 100% humidity. After this period the teeth will be sectioned at 2, 4, and 6 mm. The sections will be analyzed in stereomicroscope and confocal microscopy. The sections will be analyzed for the presence of voids, sealer and gutta-percha areas. The data will be compared statistically.(AU)

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