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Microtensile Bond Strength of Porcelain Laminate Veneers Bonded to Fluorosed Teeth
Author(s) -
Ratnaweera Priyadarshanee M.,
Fukagawa Nao,
Tsubota Yuji,
Fukushima Shunji
Publication year - 2009
Publication title -
journal of prosthodontics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.902
H-Index - 60
eISSN - 1532-849X
pISSN - 1059-941X
DOI - 10.1111/j.1532-849x.2008.00403.x
Subject(s) - materials science , bond strength , composite material , ultimate tensile strength , dentistry , adhesive , medicine , layer (electronics)
Purpose: The aim of this study was to evaluate the microtensile bond strengths (MTBSs) of porcelain laminate veneers bonded to normal and fluorosed teeth. Materials and Method: Forty human incisors, including 20 normal and 20 moderately fluorosed teeth [Thylstrup Fejerskov Index (TFI) = 4 to 6], were collected. The labial surfaces of the teeth were ground up to 1 mm and polished with #600 silicon carbide abrasive paper. The surfaces were bonded to 1‐mm‐thick ceramic slices (5 × 5 mm 2 ) previously made (VitaVM7) using one of two ceramic cement systems (RelyX or Clapearl) following the manufacturers' instructions. A resin composite was added on top of the ceramic slices and built up to 5‐mm thickness to serve as grips. The specimens were stored in water (37°C) for 24 hours, and beams of adhesive interface with a surface area of ∼1.25 mm 2 were obtained. Then the beams were subjected to MTBS tests at a crosshead speed of 1.0 mm/min. The data were analyzed with two‐way ANOVA. Results: The results of the MTBS test (MPa) were 20.55 ± 5.83 (RelyX/fluorosed), 20.16 ± 4.61 (RelyX/normal), 18.74 ± 2.88 (Clapearl/fluorosed), and 21.06 ± 4.99 (Clapearl/normal). There were no significant differences in the MTBSs among the four groups ( p > 0.05). Conclusions: The MTBSs of ceramic cement systems used were not influenced by the moderately fluorosed teeth.