Abstract
Direct pulp capping induces a local inflammatory process. Several biomaterials have been used for this procedure. The aim of this study was to compare the dentinal bridge thickness using three different pulp capping biomaterials with the conventional technique (high speed diamond bur) or Er-Yag laser, 1 month after pulp effraction. Materials and Methods: Forty two Class V cavities were prepared on the buccal surface of 4 maxillary incisors and 2 mandibular incisors of New Zealand rabbits. Specimens were divided into 6 treatment groups. Teeth were treated with: In Group 1: Er-Yag laser and Biodentine® (Septodont), in Group 2: Er: Yag laser and calcium hydroxide (Dycal® Dentsply), in Group 3: Er: Yag laser and adhesive system (Prime& Bond® NT Dentsply), in Group 4: high speed diamond bur and Biodentine® (Septodont), in Group 5: high speed diamond bur and calcium hydroxide (Dycal® Dentsply), and in Group 6: high speed diamond bur and adhesive system (Prime& Bond® NT Dentsply). The preparation was done with copious irrigation. The animals were sacrificed at 30 days and the teeth were extracted and prepared for histological analysis. Results: In the group of « laser Er-Yag », iatrogenic pulpal wounds treated with Biodentine® were covered with a thick hard tissue barrier after 1 month. The difference was not significant with the groups of Dycal® used with Er: Yag laser and high speed diamond bur. Prime& Bond® NT Dentsply specimens showed a thin dentinal bridge layer. Conclusion: At 1 month, Er-Yag laser proved to be useful with Biodentine® for direct pulp capping procedures.
Highlights
Direct pulp capping is a procedure defined to cover an exposed pulp by a biocompatible material to promote dentinal bridge formation
Most of specimens showed after 4 weeks of dental pulp capping complete dentinal bridge formation and absence of inflammatory cells
The thickness of the dentinal bridge using the high speed diamond bur was significantly higher with Biodentine®, intermediate with Dycal® and smaller with adhesive system (-p-value
Summary
Direct pulp capping is a procedure defined to cover an exposed pulp by a biocompatible material to promote dentinal bridge formation. Direct pulp capping therapies use biomaterials to protect exposed tissues, inducing repair through the production of a mineralized barrier[2] This procedure induces a local inflammatory process leading to pulp cells recruiting. Calcium Hydroxide (Ca(OH)2) has been considered as the material of choice for direct pulp capping It showed good biocompatibility properties with the dental pulp tissue, inducing the expression of reparative molecules[4]. Despite its low-grade irritation of the traumatized pulp tissue, Ca(OH)[2] showed disadvantages including gradual degradation, tunnel defects in dentinal bridge and poor sealing properties[5] These clinical characteristics have encouraged the development of several other materials for direct pulp capping[6]
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