Relationship between the strength of glass ionomers and their adhesive strength to metals.
OBJECTIVE
The objective of this study was to examine the possible correlation between the strength of glass ionomers and their adhesive strength to metals.


METHODS
Three different brands of glass ionomers mixed at four different P/L ratios were evaluated. The compressive and diametral tensile strengths of the cements were determined. The shear bond strengths were determined between four different types of dental casting alloys and the cement made with the different P/L ratios.


RESULTS
Significant (p < 0.05) increases in the bond strength to any of the metal surfaces were found in the cement specimens mixed at the highest P/L ratio compared to those mixed at the lowest P/L ratio. For two glass ionomers (FI and DNT), the specimens prepared at the highest P/L ratio showed significantly greater diametral tensile strength than those prepared at the lowest P/L ratio (p < 0.05).


CONCLUSIONS
The present study showed a significant correlation between diametral tensile strengths and bond strengths. It is suggested that the use of glass ionomers with high mechanical strength is an important factor of enhancing the adhesion to metal surfaces.
Department of Dental Materials Science, Meikai University School of Dentistry, 1-1, Keyakidai, Sakado, Saitama 350-0283, Japan. hibino@dent.meikai.ac.jp
Yasushi
Y
Hibino
Ken-ichi
K
Kuramochi
Takayuki
T
Hoshino
Akiisa
A
Moriyama
Yasuo
Y
Watanabe
Hiroshi
H
Nakajima
D000268:Adhesiveness; D019245:Compressive Strength; D003722:Dental Alloys; D001840:Dental Bonding; D017220:Dentin-Bonding Agents; D005899:Glass Ionomer Cements; D008422:Materials Testing; D012044:Regression Analysis; D033081:Shear Strength; D013718:Tensile Strength
C469235:DNT ionomer cement; D003722:Dental Alloys; D017220:Dentin-Bonding Agents; D005899:Glass Ionomer Cements; C062270:Shofu Hybond; C084541:Fuji glass-ionomer lining cement