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Enamel Microhardness Change and Plaque pH Measurements in an Intra-oral Model in Humans

Departments of Operative Dentistry, University of Alabama School of Dentistry, University of Alabama at Birmingham, University Station, Birmingham, Alabama 35294

W.R. Bodden

Department of Oral Diagnosis, University of Alabama School of Dentistry, University of Alabama at Birmingham, University Station, Birmingham, Alabama 35294

E.L. Bradley, Jr

Department of Biostatistics and Biomathematics, University of Alabama School of Dentistry, University of Alabama at Birmingham, University Station, Birmingham, Alabama 35294

T. Koulourides

Institute of Dental Research, University of Alabama School of Dentistry, University of Alabama at Birmingham, University Station, Birmingham, Alabama 35294

T. Housch

Institute of Dental Research, University of Alabama School of Dentistry, University of Alabama at Birmingham, University Station, Birmingham, Alabama 35294

Changes in plaque pH and microhardness of bovine enamel slabs were evaluated with a seven-day intra-oral cariogenicity test (ICT). The test enamel slabs were mounted in prosthetic appliances with a Dacron mesh cover for enhancement of microbial colonization. Three percent solutions of sucrose, sorbitol, and xylitol were evaluated as four daily extra-oral immersions of 10 min each, for seven days, and the results were compared with baseline experiments (no daily immersions). The pH was measured with antimony electrodes on one-day and seven-day ICT plaque samples that were challenged with a one-minute immersion in the studied substrates. Plaque samples in the baseline experiments were challenged with 3% sucrose. The enamel softening was assessed with measurements of microhardness. Sucrose challenge caused pH depression with both the baseline and the sucrose-immersed plaque. Sorbitol and xylitol challenge did not depress the plaque pH. Compared with the baseline, sucrose immersions caused enamel softening; sorbitol and xylitol did not.

Journal of Dental Research, Vol. 64, No. 8, 1065-1068 (1985)
DOI: 10.1177/00220345850640080801


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