Effect of etchant variation on wet and dry dentin bonding primed with 4-META/acetone

• Published in: Dental materials 2000-07, Vol.16 (4), p.274-279
• Main Authors: Nakabayashi, N., Hiranuma, K.
• Format: Article
• Language: English
• Subjects: 4-META; 4-META/MMA-TBB resin; Acetone - chemistry; Acetone primer; Acid Etching, Dental - methods; Acrylic Resins - chemistry; Analysis of Variance; Animals; Boron Compounds - chemistry; Cattle; Chlorides; Citric Acid - administration & dosage; Dental Bonding - methods; Dentin - ultrastructure; Dentin bonding; Dentistry; Dry bonding; Ferric Compounds - administration & dosage; Hybridized dentin; Materials Testing; Methacrylates - chemistry; Methylmethacrylate - chemistry; Microscopy, Electron, Scanning; Permeability; Polymethyl Methacrylate - chemistry; Resin Cements - chemistry; Solvents - chemistry; Stress, Mechanical; Surface Properties; Tensile bond strengths; Tensile Strength; Time Factors; Wet bonding
• ISSN: 0109-5641; 1879-0097
• DOI: 10.1016/S0109-5641(00)00017-8

Objective: To collect data that explains the advantage, if any, of wet bonding versus dry bonding to dentin, and to more clearly understand the mechanism of wet bonding. Methods: Bovine dentin samples were prepared with #600-grit paper and were divided into four groups of six each. The first six specimens were etched with 10% citric acid and 3% ferric chloride for 10 s then rinsed and blot-dried (Gr. 1: 10-3:W). The second six were etched with 10% citric acid and 3% ferric chloride then rinsed and air-dried (Gr. 2: 10-3:D). The third six were etched with 10% citric acid for 10 s, rinsed and blot-dried (Gr. 3: 10-0:W). The fourth group of six samples was etched, rinsed and air-dried (Gr. 4: 10-0:D). All groups were primed with 5% 4-methacryloyloxyethyl trimellitate anhydride (4-META) in acetone for 60 s and an acrylic rod was bonded to the samples using a 4-META/methyl methacrylate (MMA)-tri- n-butyl borane (TBB) resin. The samples were fashioned into dumbbell-shaped specimens and stressed in tension until bond failure, to determine tensile bond strengths. Fractured surfaces were examined by scanning electron microscopy. Results: The mean tensile bond strengths of specimen groups were found to be 18.9 (8.1) MPa (Gr. 1: 10-3:W), 18.1 (1.7) MPa (Gr. 2: 10-3:D), 11.9 (4.4) MPa (Gr. 3: 10-0:W) and 5.4 (2.8) MPa (Gr. 4: 10-0:D). There was no statistically significant difference between Grs. 1 and 2 (p>0.01), or between Grs. 1 and 3 (p>0.05). The TBS of Gr. 4 (10-0:D) was significantly lower than the others (p