Effect of artificial saliva contamination on pH value change and dentin bond strength

Dent Mater. 2003 Jul;19(5):429-34. doi: 10.1016/s0109-5641(02)00087-8.


Objective: This study was to examine the effect of artificial saliva contamination on pH change of the dentin surface and the micro-shear bond strength (MSBS) of the two bonding systems to contaminated dentin.

Methods: Fifty-six human dentin disks were tested with two resin bonding systems: a self-etching primer system, Clearfil SE Bond (Kuraray Medical Inc., Tokyo, Japan), and a one-bottle adhesive system, Single Bond (3M-ESPE, St. Paul, MN). Dentin surfaces were conditioned with the self-etching primer (primer) or phosphoric acid (etchant) and divided into four groups: conditioning without contamination (conditioning), contamination with artificial saliva (contamination), re-conditioning the contaminated dentin (re-conditioning), water-rinsing the contaminated dentin and re-conditioning (rinsing and re-conditioning). The pH change on the dentin surface was measured using a pH-imaging microscope (SCHEM-100, Horiba Ltd, Kyoto, Japan) to estimate the acid-base characteristics of the conditioned and contaminated dentin surface. The MSBS to the dentin was examined after storage in distilled water at 37 degrees C for 1 week.

Results: The pH of intact dentin surfaces was 6.9. Conditioning with the primer and etchant decreased the pH to 5.4 and 5.9, respectively. Saliva contamination increased the pH slightly, and re-conditioning decreased the pH again. The MSBS of the two bonding systems decreased after contamination. Re-priming restored the MSBS to control values, while re-etching did not. Rinsing and re-priming produced a reduction in MSBS, and rinsing and re-etching did not increase the MSBS.

Significance: The conditioning and saliva contamination changed the pH value of dentin surface. The MSBS decreased after contamination; however, re-priming with SE Bond primer was an adequate treatment to restore the bond strength.

Publication types

  • Comparative Study

MeSH terms

  • Acid Etching, Dental
  • Bisphenol A-Glycidyl Methacrylate
  • Chemistry, Physical / instrumentation
  • Dental Bonding*
  • Dentin / chemistry*
  • Dentin-Bonding Agents*
  • Humans
  • Hydrogen-Ion Concentration
  • Resin Cements*
  • Saliva, Artificial*
  • Semiconductors
  • Shear Strength
  • Signal Processing, Computer-Assisted
  • Surface Properties


  • Clearfil SE Bond
  • Dentin-Bonding Agents
  • Resin Cements
  • Saliva, Artificial
  • single bond
  • Bisphenol A-Glycidyl Methacrylate