Effect of saliva contamination on microleakage of a bonding system.
Saliva contamination is a major clinical problem during restorative dental treatment. Restorative systems must possess sufficient marginal sealing ability to avoid microleakage.


OBJECTIVE
The purpose of this study was to investigate the effect of saliva contamination on the microleakage of cavities restored with Prime & Bond NT and Dyract-AP.


METHODS
Cavities were prepared with occlusal margins in enamel and gingival margins in dentine on the buccal surfaces of extracted human permanent premolar teeth. The cavities were etched with phosphoric acid or a non rinse conditioner (NRC). Preparations were distributed randomly into 4 treatment groups (N = 18) consisting of two respective etching methods (phosphoric acid/NRC), each with and without saliva contamination. After the restorative process the samples were thermocycled in dye, sectioned, and scored for microleakage.


RESULTS
Contamination with saliva had no significant effect on microleakage on the enamel or dentine sides where phosphoric acid was used as conditioner. Where NRC was used, significantly more microleakage was observed at the enamel sides, but significantly less at the dentine sides.
Saayman
C M
CM
Department of Restorative Dentistry, Faculty of Dentistry, UWC, Private Bag X1, Tygerberg 7505, South Africa. cmsaayman@uwc.ac.za
Grobler
S R
SR
Rossouw
R J
RJ
Oberholzer
T G
TG
D000704:Analysis of Variance; D001641:Bicuspid; D020770:Compomers / Q000737:chemistry; D001840:Dental Bonding; D003763:Dental Leakage / Q000209:etiology*; D017220:Dentin-Bonding Agents / Q000737:chemistry; D006801:Humans; D011109:Polymethacrylic Acids / Q000737:chemistry; D012463:Saliva; D018709:Statistics, Nonparametric
D020770:Compomers; D017220:Dentin-Bonding Agents; C088486:Dyract; D011109:Polymethacrylic Acids; C425843:Prime and Bond NT