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Title: Effects of light penetration and smear layer removal on adhesion of post-cores to root canal dentin by self-etching adhesives. Author: Wu H, Hayashi M, Okamura K, Koytchev EV, Imazato S, Tanaka S, Tanaka Y, Sano H, Ebisu S. Journal: Dent Mater; 2009 Dec; 25(12):1484-92. PubMed ID: 19700189. Abstract: OBJECTIVES: This study investigated the effects of light penetration and removal of smear layer on the adhesive properties of self-etching adhesives to root canal dentin when using fiber posts. METHODS: Altogether 54 human incisors and premolars were decoronated, and the roots after preparing the post space were randomly assigned into six groups. Three groups were treated with a light-cured self-etching adhesive and the other three with a dual-cured self-etching adhesive. In a further sub-division, the first group was light-cured with an irradiation unit; the second was light-cured with the irradiation unit and a light-guiding attachment; and the third was light-cured with the irradiation unit and the attachment after removing smear layer by EDTA and NaOCl. Then, a glass-fiber post was luted into the post space by a dual-cured composite. After 24h, an hourglass-shaped specimen was trimmed and subjected to MTBS testing. RESULTS: Using the light-guiding attachment and removing the smear layer reduced the incidence of pre-testing failure significantly from 57.1% to 19.0% (p<0.05) in the light-cured adhesive groups and from 68.3% to 3.2% (p<0.01) in the dual-cured adhesive groups. The MTBS in different locations within a post space were in the range from 8.9 to 17.5MPa in the light-cured group and from 11.2 to 17.2MPa in the dual-cured group. SIGNIFICANCE: Better light penetration in post spaces and removal of the smear layer are effective in improving the adhesive properties of self-etching adhesives to root canal dentin when using fiber posts.[Abstract] [Full Text] [Related] [New Search]