465 - SDF’s Effect on Hardness of Carious Lesions in Primary Teeth

Purpose: Previous studies show that using an LED curing light after 10-sec application increases SDF penetration similar to a 1-min application without LED. This ex-vivo study investigated the utilization of an LED light on the hardness of SDF treated carious teeth.

Methods: Twenty-four teeth with dentin carious lesions were allocated into 5 groups: three SDF-treated which received 1 drop of SDF: (1) n=6; SDF for 1-min with 10-sec rinse, (2) n=6; SDF for 10-sec and exposed to LED light for 20-sec followed by 10-sec rinse, and (3) n=6; SDF for 10-sec and 10-sec rinse; and 2 untreated controls: (4) n=3; untreated and (5) n=3; untreated, exposed to LED for 20-sec. Samples were embedded, sectioned, and polished. The hardness of the treated and untreated lesions and sound dentin were measured using the Hysitron TI 950 Triboindenter.

Results: Sound dentin hardness in all groups was similar, with a mean of 0.973±0.100 Gpa (P>.001). Mean ± SD hardness (all in GPa) in the body of the lesion was: Group 1: 0.460±0.097, Group 2: 0.540±0.357, Group 3: 0.211±0.060, Group 4: 0.229±0.073, and Group 5: 0.185±0.059. Groups 1 and 2 were statistically similar to each other and different from groups 3, 4, and 5 (P < .001).

Conclusion: Utilization of an LED curing light may help increase SDF application efficacy in carious lesions within a shorter treatment time.

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Research supported by a National Institutes of Health S10 Shared Instrumentation Program grant, number 1S10OD026989-01.