Influence of decontamination procedures on shear forces after contamination with blood or saliva.
BACKGROUND
Despite rapid development in adhesive technology, contamination of bonding surfaces remains a major problem. The aims of this study were to evaluate the influence of contamination on bond strength and to investigate possible decontamination procedures.


METHODS
Four bonding systems were evaluated for their shear bond strengths under 5 bonding situations: control (without contamination and decontamination); contamination with blood; contamination with saliva; decontamination with water and air, and repriming after blood contamination; and decontamination with water and air, and repriming after saliva contamination. The 25 specimens of each group consisted of composite blocks bonded to bovine teeth. Shear forces were measured with a testing machine after thermocycling.


RESULTS
The 3 composite primers showed similar behavior. With the exception of Transbond SEP (3M Unitek, Monrovia, Calif) with saliva contamination, all contaminated samples showed greatly reduced shear forces. The control and decontaminated groups showed shear forces about 20 MPa. The resin-modified glass ionomer, however, did not reach clinically sufficient bond strengths in either setup.


CONCLUSIONS
Decontamination with water and air and repriming is sufficient after contamination with blood or saliva. Etching again is not necessary. The bond strength of Transbond SEP was not significantly altered by saliva contamination and can be recommended for conventional bonding procedures.
Brauchli
Lorenz
L
Assistant professor, Clinic of Orthodontics and Pedodontics, University of Basel, Basel, Switzerland. Electronic address: lorenz.brauchli@unibas.ch.
Eichenberger
Martina
M
Undergraduate student, Clinic of Orthodontics and Pedodontics, University of Basel, Basel, Switzerland.
Steineck
Markus
M
Engineer, Clinic of Orthodontics and Pedodontics, University of Basel, Basel, Switzerland.
Wichelhaus
Andrea
A
Professor and dean, Clinic of Orthodontics and Pedodontics, University of Basel, Basel, Switzerland.
D000134:Acid Etching, Dental; D000818:Animals; D001769:Blood; D002417:Cattle; D003666:Decontamination / Q000379:methods*; D001840:Dental Bonding; D003743:Dental Enamel; D003799:Dental Stress Analysis; D016910:Orthodontic Brackets; D019279:Resin Cements; D012463:Saliva; D033081:Shear Strength; D018709:Statistics, Nonparametric
D019279:Resin Cements