Biomechanical Effects of Bonding Pericervical Dentin in Maxillary Premolars
| Autor: | Shimon Friedman, Fang-Chi Li, Anil Kishen, Nghia Huynh |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Dental Stress Analysis
Materials science Post hoc Root dentin 01 natural sciences Composite Resins 010309 optics 03 medical and health sciences Tooth Fractures 0302 clinical medicine stomatognathic system 0103 physical sciences otorhinolaryngologic diseases Premolar medicine Dentin Maxilla Humans Bicuspid General Dentistry Orthodontics Tooth Nonvital Dental Bonding 030206 dentistry Biomechanical Phenomena Root Canal Therapy Compressive load Cementoenamel junction medicine.anatomical_structure Coronal plane Moire interferometry |
| Zdroj: | Journal of endodontics. 44(4) |
| ISSN: | 1878-3554 |
| Popis: | Introduction Pericervical dentin (PCD) loss may increase root fracture propensity in root-filled teeth. This study evaluated the impacts of bonding PCD with composite resin (CR) on radicular microstrain distribution and load at failure of root-filled maxillary premolars. Methods Ten single-canal maxillary premolars decoronated 2 mm coronal to the cementoenamel junction (CEJ) had canals enlarged with ProTaper Universal instruments (Dentsply Tulsa Dental Specialties, Tulsa, OK) to F3. They were root filled with gutta-percha (GP) to the CEJ and restored with Cavit (3M Deutschland GmbH, Neuss, Germany) (GP group, n = 5) or 6 mm apical to the CEJ and restored with bonded CR to simulate bonding of PCD (bonded PCD group, n = 5). Digital moire interferometry was used to evaluate pre- and postoperative whole-field microstrain distribution in the root dentin under physiologically relevant loads (10–50 N). Another 30 premolars, similarly treated as groups 1 and 2 or left untreated as controls (n = 10/group), were subjected to cyclic loads (1.2 million cycles, 45 N, 4 Hz) followed by uniaxial compressive load to failure. Mechanical data were analyzed with 1-way analysis of variance and the post hoc Tukey test at a 5% level of significance. Results Microstrain distribution showed bending and compressive patterns at the coronal and apical root dentin, respectively. In the GP group, microstrain distribution was unaltered. In the bonded-PCD group, different microstrain distribution suggested stiffening at the PCD. The load at failure did not differ significantly for the GP, bonded PCD, and control groups (P > .05). Conclusions CR bonding of PCD might impact the biomechanical responses in maxillary premolar roots at low-level continuous loads. The effect of this impact on root fracture loads when subjected to cyclic load warrants further investigation. |
| Databáze: | OpenAIRE |
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