Macorra García, José Carlos de la and San-Nicolás, Adriana (2005) Method to compare [mu]-tensile bond strength of a self-etching adhesive and [mu]-cohesive strength of adjacent dentin. Dental materials, 21 (10). pp. 946-953. ISSN 0109-5641
Official URL: http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6VP3-4G3SC8T-3-7&_cdi=6195&_user=144492&_orig=browse&_coverDate=10%2F31%2F2005&_sk=999789989&view=c&wchp=dGLbVlz-zSkWW&md5=eea6a773d38969ebe0a9e697f5a6a960&ie=/sdarticle.pdf
Laboratory results from tensile or micro-tensile testing of adhesive/restorative systems need a gold standard to make their interpretation possible. This can be done by comparing the [mu]-tensile bond strength ([mu]TBS) of the tested adhesive(s) with the [mu]-tensile cohesive strength ([mu]TCS) of the adjancent dentin, which in meant to be replaced by the restoration.
Objectives: to test immediate [mu]TBS of and adhesive/restorative system versus [mu]TCS of the dentin adjacent to the bonded interface, in perfused specimens.
Methods: enamel and roots of five-third sound molars were removed and teeth were perfused (30 cm distelled water) until after the bonding procedure was completed. Parallel grooves (1.5-mm wide X 1.5-mm deep, separeted by 1.5 mm), were drilled in the exposed dentin, under water refrigaration. Teeth were restored (AdheSE/Filtek Z250). Specimens were sawn from grooves to test [mu]TBS (n=32) of dentin, adjacent to adhesive interfaces, both areas to be tested at the same relative depth. Areas to be studied were rounded (mean bonded surface area for both groups, BA=0.68 mm2), and [mu]TBS and [mu]TCS were found. As not all BAs were identical, residuals of [mu]TBS and [mu]TCS values to the regression line relating BA and tensile test result (representing the null hypothesis, i.e. [mu]TBS=[mu]TCS) were compared using a non-parametric test.
Results: difference in the means of residuals was not stadistically significant (two tails p=0.067).
Significance: mean [mu]TBS of the tested adhesive was nor different to mean [mu]TCS of adjacent dentine. The null hypothesis was not rejected.
|Uncontrolled Keywords:||Micro-tensile bond strength, micro-cohesive dentin strength, self-etch adhesive, dentin|
|Subjects:||Medical sciences > Dentistry > Preventive dentistry|
Medical sciences > Dentistry > Dental materials
|Deposited On:||25 Nov 2005|
|Last Modified:||06 Feb 2014 07:43|
Repository Staff Only: item control page