These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Durability of microtensile bond to nonetched and etched feldspar ceramic: self-adhesive resin cements vs conventional resin.
    Author: Souza RO, Castilho AA, Fernandes VV, Bottino MA, Valandro LF.
    Journal: J Adhes Dent; 2011 Apr; 13(2):155-62. PubMed ID: 21594229.
    Abstract:
    PURPOSE: The objective of this study was to evaluate the effect of thermocycling (TC), self-adhesive resin cements and surface conditioning on the microtensile bond strength (μTBS) between feldspathic ceramic blocks and resin cements. MATERIALS AND METHODS: Fifty-six feldspathic ceramic blocks (10 x 7 x 5 mm) (Vita Mark II) were divided into groups according to the factors "resin cement" (3 cements) and "surface conditioning" (no conditioning or conditioning [10% hydrofluoric acid etching for 5 min + silanization]) (n = 8): group 1: conditioning+Variolink II (control group); group 2: no conditioning+Biscem; group 3: no conditioning+RelyX U100; group 4: no conditioning+Maxcem Elite; group 5: conditioning+ Biscem; group 6: conditioning+RelyX U100; group 7: conditioning+Maxcem Elite. The ceramic-cement blocks were sectioned to produce non-trimmed bar specimens (adhered cross-sectional area: 1 ± 0.1 mm2), which were divided into two storage conditions: dry, μTBS immediately after cutting; TC (12,000x, 5°C/55°C). Statistical significance was determined using two-way ANOVA (7 strategies and 2 storage conditions) and the post-hoc Tukey test (p < 0.05). RESULTS: Resin cement and thermocycling affected the μTBS significantly (p = 0.001). In the dry condition, group 5 (18 ± 6.5 MPa) presented the lowest values of μTBS when compared to the other groups. TC decreased the mean μTBS values significantly (p < 0.05) for all resin cements tested (9.7 ± 2.3 to 22.1 ± 6.3 MPa), except for the resin cement RelyX U100 (22.1 ± 6.3 MPa). In groups 3 and 4, it was not possible to measure μTBS, since these groups had 100% pre-test failures during sectioning. Moreover, the same occurred in group 2 after TC, where 100% failure was observed during thermocycling (spontaneous failures). CONCLUSION: Hydrofluoric acid etching and silanization of the feldspathic ceramic surface are essential for bonding self-adhesive resin cement to a feldspathic ceramic, regardless of the resin cement used. Non-etched ceramic is not recommended.
    [Abstract] [Full Text] [Related] [New Search]