Date of Award

Summer 1994

Document Type


Degree Name

Master of Science (MS)


Dental Hygiene


Dental Hygiene

Committee Director

Deanne Shuman

Committee Member

Michele L. Darby

Call Number for Print

Special Collections LD4331.D46J33


Commercial sodium bicarbonate toothpaste is a relatively new product on the market and limited research has tested its effects on composite material. The purpose of this investigation was to determine and compare, invitro, the effects of a commercially available sodium bicarbonate toothpaste versus a leading brand of fluoridated toothpaste on composite restorative material simulated in daily toothbrushing for a six month time period. Deionized water was used as the control treatment. A three-group, post-test only design was used to test the abrasive effects of the paste on 48 filled composite resin shade guide teeth. The digital microprocessor scanning device, a measurement component of the scanning electron microscope, was employed to examine surface changes in the composite material. A root surface smoothness test, was utilized by a calibrated examiner to categorize the scanning electron microscope photomicrographs. Data on the amount of abrasion in micron measurements was analyzed using analysis of variance; Duncan's multiple range test was employed to determine significant differences. An alpha level of 0.05 was selected for testing of hypotheses. Results indicated that specimens brushed with water exhibited some surface roughness as compared to the dentifrices; however, there were no statistically significant differences between the dentifrices. It was concluded that sodium bicarbonate dentifrice and fluoridated dentifrice were no more abrasive than water on composite material and created a smoother surface than water with minimal nicking and marking.


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