Histopathologic Evaluation of three Ultraviolet-Activated Composite Resins on Monkey pulps

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Abstract
The pulpal responses of 3 UV-activated composite resins, Nuva-Fil, Experimental UV #1 and Experimental UV #2, were tested on adult monkey teeth using silicate and zinc oxide eugenol (ZOE) as positive and negative controls. All materials were placed in Class V cavity preparations in Rhesus monkey teeth using approximately 48 anterior and 63 posterior teeth of both the maxillary and mandibular arches. A total of 111 teeth were utilized and all materials were evaluated at 3 days, 5 and 8 wk. Following left ventricular perfusion, the teeth were prepared for microscopic evaluation using routine histological procedures. The 3 day pulpal response of all the UV-activated composites was slight with some disruption and vacuolization in the odontoblastic layer and a slight inflammatory response. At 5 wk there was a reduction of the inflammatory response, and the formation of reparative dentin was noted for all UV composites. The 8 wk pulp response was slight, characterized by a minimal inflammatory response adjacent to the zone of reparative dentin. ZOE produced the mildest response while silicate produced the most severe response at the 3 time intervals.

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