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In this Technique Geek case, Bisco Inc. offers a video how-to with Dr. Robert E. Rada demonstrating how he uses Bisco's TheraCal LC protectant/liner to help reduce potential for post-operative sensitivity.
Lining dental material is frequently used beneath dental restorations to reduce the potential for post-operative sensitivity, but take on a much greater role long-term in serving as pulpal protectants.
Several qualities of a liner are necessary for effective pulpal protection:
1) establish a tight seal to prevent bacterial invasion during the implant, or other type of restoration;
2) stimulate mineralization;
and 3) maintain an antibacterial alkaline-related biological environment.
Post-operative sensitivity is partially related to the remaining dentin thickness following cavity preparation and the presence of bacteria. There’s no material better to protect the pulp than dentin itself. The remaining dentin thickness between the base of the cavity preparation and the pulp is one of the most important factors in protecting the pulp from toxins. A 0.5 mm thickness reduces the effect of toxins by 75%. A 1.0 mm thickness reduces the effect of toxins by 90%. A 2.0 mm remaining dentin thickness or more results in little or no pulpal reaction. It is at this 0.5 mm region that liners become most important. Clearly, decreasing the remaining dentin thickness of cavity restorations can compromise odontoblast survival and influence repair in the pulp-dentine complex after injury.1