Evaluation of bond strength in single-cone fillings of canals with different cross-sections
| Autor: | Graziela Bianchi Leoni, Manoel Brito-Júnior, Carlos Estrela, Rodrigo Dantas Pereira, M. D. de Sousa-Neto |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Molar
business.industry Bond strength Root canal Dental Bonding Dentistry Magnification 030206 dentistry Root Canal Filling Materials 03 medical and health sciences Reciprocating motion 0302 clinical medicine medicine.anatomical_structure 030220 oncology & carcinogenesis Coronal plane medicine Root filling Humans RESISTÊNCIA DE UNIÃO (ODONTOLOGIA) Single cone Gutta-Percha business General Dentistry |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| ISSN: | 0143-2885 |
| DOI: | 10.1111/iej.12607 |
| Popis: | To evaluate the effect of root canal cross-sectional shape on single-cone root filling bond strength, as well as to determine the percentage of gutta-percha-filled areas (PGFA) and sealer-filled areas (PSFA), establishing a relationship between these variables.Distal roots of mandibular molars were selected using microcomputed tomography imaging and allocated into three groups (n = 10) according to canal shape: round, oval and long oval. The canals were prepared with an R40 reciprocating instrument and filled with matching single-cone gutta-percha and AH Plus sealer. Two 1-mm-thick dentine slices were obtained from each third of each root. PGFA and PSFA were calculated in digital images (x25 magnification) of each slice. Next, the slices were subjected to a push-out test and the failure modes (adhesive, cohesive or mixed) were assessed. Data were analysed using parametric tests (P 0.05).In the coronal (2.17 ± 0.56MPa) and middle thirds (1.78 ± 0.45MPa), the round canals were associated with higher bond strength values (P 0.01), with no difference between the groups for the apical third (P 0.05). Adhesive and mixed failures predominated in round canals, whilst cohesive failures were more frequent in oval and long oval canals. Round canals had significantly higher PGFA and lower PSFA than all other groups (P = 0.000). The PGFA and PSFA had a positive (r = 0.521, P = 0.000) and a negative (r = -0.523, P = 0.000) correlation with bond strength, respectively.Bond strength values of gutta-percha and sealer were affected by canal shape. Higher percentage of gutta-percha-filled area resulted in higher bond strength to dentine. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text