| Autor: |
Manhães, Lussaraazevedo, Oliveira, Denise Cerqueira, Marques, Márcia Martins, Matos, Adriana Bona |
| Zdroj: |
Photomedicine and Laser Surgery; June 2005, Vol. 23 Issue: 3 p304-312, 9p |
| Abstrakt: |
Objective: The aim of this in vitro study was to evaluate how surface preparation and primer application technique can influence the microtensile bond strength of self-etching system. Background Data: One of the possible applications of dental lasers includes increasing the quality of bond strength. Materials and Methods: 12 extracted, sound human molars were ground flat to expose occlusal dentin and were then divided into six groups (G1–G6)(n = 30–36) according to surface preparation and primer application (active or passive): G1—diamond bur (DB) + active primer (AP); G2—DB + passive primer (PP); G3—Er:YAG laser (EL) + AP; G4—EL + PP; G5—#600-grit paper disc (PD) + AP; G6—PD + PP. After adhesive procedure, 5-mm high composite buildups were created with Z 250. After storage in water at 37°C for 24 h, teeth were vertically sectioned into serial 1- mm2 sticks. Samples were tested for tension in an Instron machine at 0.5 mm/min. Nine additional molars were prepared to morphological analysis. Regular grit diamond bur, Er:YAG laser, or #600-grit SiC paper was used for SEM observations of dentin surfaces of each group before and after treatment with self-etching primers. Microtensile data were submitted to statistical analysis. Results: G1—43.85 ± 9.60 MPa; G2—24.28 ± 8.90 MPa; G3—24.11 ± 4.05 MPa; G4—23.30 ± 4.21 MPa; G5—55.64 ± 8.50 MPa; G6—56.45 ± 12.05 MPa. Conclusions: (1) Er:YAG laser and diamond burs are able to create distinct smear layers; however the resistance of dentin/adhesive interface is similar. In this way, we can use both instruments clinically without diminishing bond strength; (2) the #600-grit sandpaper disc least affects resistance and is highly recommended for in vitro studies to achieve standard preparation of dentinal surface; (3) active primer application is the method most recommended, despite the type of dentin preparation instrument used. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
