Effect of F Releasing Restorative Material on De/Remin of Roots. T. H. JORDAN*, R. BRADSHAW, S. FRAHM, M. M. HOGAN, ADRIANA SEGURA, KEVIN J. DONLY, AND J. S. WEFEL (Dows Institute for Dental Research, College of Dent., Univ. of Iowa, Iowa City and Cornell College, Mt. Vernon, IA, USA
The purpose of this in situ research was to evaluate the effect of F releasing restorative materials on de/remin of root lesions placed interproximally to the restorative material. 21 participants received crown preparations on a mandibular molar and Class II inlay preparations on an adjacent tooth. Each person participated in six, 30-day experimental legs.
Artificial root lesions were formed by placing extracted molars in a partially saturated buffer system. Lesions were cut into thin sections such that at least six sections were available from each lesion. Thus sections from the same lesion could be used in all six legs for a single experimental subject. A section was placed in the crown area that was interproximal to the inlay test material. After the 30-day intraoral exposure, the crown, inlay, and section were replaced with material for the next leg. All sections were analyzed using microradiography (MRG) both before and after the experimental treatment. The restorative materials tested were: 1) A non-F resin composite (P-50-3M), 2) An F resin composite (Heliomolar Radiopaque – Ivoclar), and 3) A resin-modified glass ionomer cement (Vitremer – 3M). Each of the three was tested with both a non-F dentifrice and an F dentifrice. The average increases in þZ are: Each of the groups exhibited an increase in demineralization on the average. For the two composite materials, the use of an F dentifrice provided a significant lessening of lesion progression. The glass ionomer material, either with or without an F dentifrice, was significantly better at slowing demineralization than the composite materials.
This work shows that an F releasing restorative material can significantly affect the degree of demineralization of a lesion which is interproximal to the material.
Robert Bradshaw, ’00 South Pekin, IL
Majors: Chemistry, Computer Science
Sponsor: Truman Jordan