Bonding of a light-curing glass-ionomer cement to dental amalgam.
In the clinical situation, the need may arise for placement of a glass-ionomer cement over an existing amalgam restoration. This study assessed the tensile bond strength of a recently developed light-curing glass ionomer (Vitrabond) to dental amalgam (Dispersalloy), with and without the use of Scotchbond dual cure as an intermediary. Amalgam adherend specimens were prepared, then aged in water at 37 degrees C for seven days. Immediately before being bonded, the amalgam surfaces were finished flat on 600-grit paper. Forty specimens were used for bonding in this condition, and another 40 were covered with a thin layer of Scotchbond, which was light-cured for 10 s. The glass-ionomer was applied to the adherend surface in two increments, each light-cured for 30 s. After being bonded, half the specimens were stored in water at 37 degrees C, while half were stored in an environment of 95 +/- 5% RH at 37 degrees C. The 24-hour tensile bond strengths, in MPa, were: for specimens stored in water, without Scotchbond 8.4 +/- 1.2, with Scotchbond 4.7 +/- 1.3%; and for specimens stored in 95 +/- 5% RH, without Scotchbond 9.2 +/- 2.1, with Scotchbond 4.6 +/- 1.5. The data were further analyzed by the Weibull distribution function. It was concluded that a strong reliable bond can be achieved between Vitrabond and set Dispersalloy, and that the use of Scotchbond as an intermediary is contra-indicated.
Department of Conservative Dentistry, University of Bristol, United Kingdom.
Y E
YE
Aboush
R J
RJ
Elderton
D000075202:Contraindications; D003723:Dental Amalgam; D001840:Dental Bonding; D003738:Dental Cements; D005899:Glass Ionomer Cements; D008422:Materials Testing; D019279:Resin Cements; D013718:Tensile Strength
D003738:Dental Cements; D005899:Glass Ionomer Cements; D019279:Resin Cements; D003723:Dental Amalgam; C041330:Scotchbond