Influence of blood contamination before or after surface treatment on adhesion of 4-META/MMA-TBB resin to root dentin.

The purpose of this study was to evaluate the influence of blood contamination before or after surface treatment on adhesion of 4-META/MMA-TBB resin. After bovine root dentin surfaces were contaminated with blood before or after dentin surface treatment with 10-3 solution, the contaminated surface was rinsed with water, air-dried, or re-treated with 10-3 solution. Dye leakage and microtensile bond strength (MTBS) of 4-META/MMA-TBB resin to dentin were measured after storage in water for 24 h.

Bone perforation and placement of collagen sponge facilitate bone augmentation.

Background: Bone perforation may induce bone marrow cell migration into a collagen sponge onlay implant. This study investigated the efficacy of bone perforation and collagen sponge onlay placement with regard to new bone formation.

Methods: One hundred sixty femurs of 80 Wistar male rats were used in four groups: bone perforation and sponge (PS) group: after perforating the femur, fibrillar and heat-denatured collagen (FC-HAC) sponges were placed on the femur; sponge (S) group: a FC-HAC sponge was placed directly on the femur without bone perforation; perforation (P) group: femur perforation without collagen sponge placement; and control (C) group: neither bone perforation nor sponge placement was used.