Clinical performance of self-etching adhesives with saliva contamination.
OBJECTIVE
The aim of this clinical study was to investigate the influence of salivary exposure on microtensile bond strength of one self-etching adhesive resin.


METHODS
Thirty carious premolars were divided into two groups: a rubber-dam was either inserted before or after cavity preparation and the cavities were restored using direct composite resin. After extraction, the teeth were sectioned into microbars and the microtensile bond strength (MTBS) test was conducted (a = 0.05). Scanning electron microscopy (SEM) and silver nitrate staining to detect nanoleakage were conducted to evaluate the sealing quality of the bonded interface.


RESULTS
Statistical analysis revealed that placement of rubber-dam before cavity preparation resulted in significantly higher MTBS values (24 ± 2 MPa) and predominantly cohesive failures (85%). SEM of specimens exposed to saliva revealed the presence of structural defects at the tooth/resin interface and pull-out of shorter resin tags. Silver nitrate nanoleakage confirmed these findings as well.


CONCLUSIONS
It is recommended to insert a rubber-dam before commencing with cavity preparation in order to ensure strong and durable bond strength.
Aboushelib
Moustafa N
MN
Dental Biomaterials Department, Alexandria University, Egypt. info@aboushelib.org
D000268:Adhesiveness; D000293:Adolescent; D001641:Bicuspid / Q000473:pathology; D002648:Child; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding; D003731:Dental Caries / Q000628:therapy; D003737:Dental Cavity Preparation / Q000295:instrumentation; D003763:Dental Leakage / Q000145:classification; D003764:Dental Materials / Q000737:chemistry; D003793:Dental Restoration, Permanent / Q000379:methods; D003799:Dental Stress Analysis / Q000295:instrumentation; D003804:Dentin / Q000648:ultrastructure; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D019279:Resin Cements / Q000737:chemistry*; D016733:Rubber Dams; D012463:Saliva / Q000737:chemistry*; D016622:Silver Staining; D013314:Stress, Mechanical; D013718:Tensile Strength; D014961:X-Ray Diffraction; D055815:Young Adult
C438313:Clearfil SE Bond; D003188:Composite Resins; D003764:Dental Materials; C444701:Filtek Z250; D019279:Resin Cements