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Journal of Dental Research
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The Effect of Five-year Storage Prior to Bonding on Enamel/Composite Bond Strength

V.D. Williams

Department of Family Dentistry

C.W. Svare

Department of Fixed Prosthodontics, University of Iowa, College of Dentistry, Iowa City, Iowa 52242

The purpose of this study was to examine the effect of pre-bonding storage durations on the shear strength of light-cured composite bonded to enamel. Thirty whole extracted human molars - 12 with a storage time of five years, 12 with a storage time of three or fewer months, and six with a storage time of 24 hours or less - were mounted in improved dental stone in copper tubing. The molars were faced 90° to the horizontal with a milling device to produce 120 surfaces, 48 each for two groups, and 24 for one group. Composite buttons 2.3 mm in diameter were bonded to the enamel using the acid-etch light-curing system. The samples were tested in shear utilizing a cross-head speed of 0.5 cm/min with a 500-kg load cell. The results showed that: (1) there was no significant difference, at the 0.05 confidence level, in compositelenamel bond strength between teeth stored for 24 hours, three months, and five years prior to bonding; (2) the lingual surface developed the highest composite/enamel bond strength in all three groups; and (3) enamel fracture occurred 29% of the time on de-bonding.

Journal of Dental Research, Vol. 64, No. 2, 151-154 (1985)
DOI: 10.1177/00220345850640021201
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