Abstract
The aim of this study was to evaluate the effect of magnification during post space preparation on root cleanness and on fiber post bond strength. Methods: Thirty human central upper incisors with similar root canal in size and shape were selected, decoronated to 15 mm and endodontically filled. The teeth were assigned into 3 groups (n=10), according to the method of magnification during post space preparation inspection: Control, using naked eye; loupe, using a dental surgical 3x magnifying glass; surgical microscope, using a 6x surgical microscope. The roots were scanned by using micro-CT before and after post space preparation for residue remnants evaluation. Fiber posts were cemented using self-adhesive resin cement (Rely X U200, 3M-ESPE). Two 1-mm-thick slices from the cervical, medium and apical thirds were submitted to a push-out test (PBS). Failures modes were classified. PBS data were analyzed by using two-way ANOVA with repeated measurement and the Tukey test. The significance level was set at 5%. The method of visualization had no effect on PBS (p=0.556). The cervical region had higher values than apical region irrespective of the inspection method (p=0.012). Adhesive failure between the resin cement and dentin was the prevalent failure mode for all groups. Micro-CT analysis showed no difference on root cleanness into the root canal after post space preparation. The use of magnification devices as loupe and microscope while performing post space do not improve the PBS and did not affect sealer remain of decoronated anterior teeth.
Highlights
Post debonding has been described as the most common complications of adhesively cemented fiber pots [1]
Previous researches demonstrated that only microscope allowed the observation of structures much smaller than 0.06mm inside the root canal, in all locations, independent of age [15]
Dentists over 40 years of age were dependent on the microscope to inspect the root canal system [15]
Summary
Post debonding has been described as the most common complications of adhesively cemented fiber pots [1]. The endodontic cement used to seal the root canal, as well as the density and orientation of the root dentin tubules and deposition of cementum and secondary dentin are factors that may compromise the fiber post retention [2]. Self adhesive cements have been reported as incapable of removing the smear layer [10]. They are unable to etch through the smear layer formed after the post space preparation [3]. The removal of the smear layer is indicated during the biomechanical preparation of the root in order to allow better infiltrate the collagen, increasing the contact surface of the filling material with dentin and to obtain properly cleaned dentin surfaces [11,12]
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