title: Effect of saliva contamination on the shear bond strength of a new self-etch adhesive system to dentin.
abstract: OBJECTIVE
  To evaluate the effect of saliva contamination on the shear bond strength of a new two-step self-etch adhesive (P90 system adhesive) to dentin and to determine the effect of contaminant removing treatments on the recovery of bond strengths.
  
  
  METHODS
  The buccal surfaces of 40 human premolars were ground to expose dentin. The specimens were randomly divided into four groups. Group 1 is uncontaminated and serves as the control group. Further groups were divided based on the step in the bonding sequence when the contamination had occurred as follows: Group 2 (primer, saliva contamination, rinse and dry), group 3 (after procedure of group 2, reapplication of primer), and group 4 (after procedure like in control group, saliva contamination, rinse and dry). Filtek P90 composite resin cylinders of 3 mm diameter and 3 mm length were fabricated on the surfaces. Shear bond strength testing was done in an Instron Universal Testing Machine and the data were subjected to one-way analysis of variance (ANOVA) and Student's t-test.
  
  
  RESULTS
  With P90 system adhesive, group 2 and group 4 showed lower shear bond strength than group 1 (control) and group 3 (P < 0.05).
  
  
  CONCLUSIONS
  Saliva contamination significantly decreased the shear bond strength of the adhesive to dentin.
authors.affiliation: Department of Conservative Dentistry and Endodontics, People's College of Dental Sciences, Bhopal, India.
authors.forename: Swapna
authors.initials: S
authors.lastname: Munaga
authors.affiliation: Department of Prosthodontics, People's College of Dental Sciences, Bhopal, India.
authors.forename: Rajkiran
authors.initials: R
authors.lastname: Chitumalla
authors.affiliation: Department of Preventive and Community Dentistry, Mamatha Dental College, Khammam, Andhra Pradesh, India.
authors.forename: Satheesh Kr
authors.initials: SK
authors.lastname: Kubigiri
authors.affiliation: Department of Conservative Dentistry and Endodontics, People's College of Dental Sciences, Bhopal, India.
authors.forename: Manjusha
authors.initials: M
authors.lastname: Rawtiya
authors.affiliation: Department of Conservative Dentistry and Endodontics, People's College of Dental Sciences, Bhopal, India.
authors.forename: Sheeba
authors.initials: S
authors.lastname: Khan
authors.affiliation: Department of Preventive and Community Dentistry, PMNM Dental College and Hospital Bagalkot, Karnataka, India.
authors.forename: Parappa
authors.initials: P
authors.lastname: Sajjan
keywords: Adhesion; contamination; self-etch primer; shear bond strength