Microtensile bond strengths of glass ionomer (polyalkenoate) cements to dentine using four conditioners

• Published in: Journal of dentistry Vol. 28; no. 5; pp. 361 - 366
• Main Authors: Tanumiharja, M, Burrow, M.F, Tyas, M.J
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01-07-2000
• Subjects: Acrylic Resins - chemistry; Analysis of Variance; Carbon Compounds, Inorganic; Conditioners; Dental Bonding - methods; Dentin - ultrastructure; Dentin-Bonding Agents - chemistry; Dentistry; Glass ionomer; Glass Ionomer Cements - chemistry; Humans; Materials Testing; Microscopy, Electron, Scanning; Microtensile bond strengths; Molar, Third; Polyalkenoate cement; Resins, Synthetic - chemistry; Silicon Compounds; Stress, Mechanical; Surface Properties; Tensile Strength; Time Factors; Water; Polyalkenoate cement; Glass ionomer; Microtensile bond strengths; Conditioners
• ISSN: 0300-5712; 1879-176X
• DOI: 10.1016/S0300-5712(00)00009-9

Objectives: The purpose of this study was to measure the microtensile bond strengths of three glass ionomer cements to dentine (Photac-Fil Quick; Fuji II LC; Fuji IX GP) using four different conditioners (Ketac Conditioner; Dentin Conditioner; Cavity Conditioner; and an experimental conditioner, K-930).
Methods: Superficial occlusal dentine of extracted human third molars was exposed, finished with wet 600-grit silicon carbide paper, and each of the above glass ionomer cements bonded using the four conditioners according to the manufacturers' instructions. After 24
h in tap water at 37°C, the teeth were sectioned to obtain 3–4 bar-shaped specimens. Ten specimens were prepared for each group and shaped to an hour-glass form of (1.2±0.02)
mm diameter. The specimens were mounted in a jig and stressed in tension at a crosshead speed of 1
mm/min until failure. The mean bond strengths were calculated and compared using one-way ANOVA and LSD tests, and the fracture modes were examined by scanning electron microscopy.
Results: Mean microtensile bond strengths for Photac-Fil Quick were not significantly different from Fuji II LC for each of the conditioners used. However, the bond strengths for Photac-Fil Quick were significantly greater than Fuji II LC when no conditioner was applied. Mean microtensile bond strengths of conditioned specimens of Fuji II LC were significantly greater than non-conditioned specimens. Mean microtensile bond strengths of non-conditioned specimens of Fuji IX GP were not significantly different from conditioned specimens. The fracture mode of all specimens demonstrated mostly cohesive failure within the cement.
Significance: The use of surface conditioners resulted in improvement in bond strength of Fuji II LC, while Photac-Fil Quick and Fuji IX GP showed no difference.