Resin luting materials: Tissue response in dog's teeth.

Area of Science:

• Dental Materials Science
• Biocompatibility Studies
• Restorative Dentistry

Background:

• Resin-based luting materials are widely used in indirect restorations.
• Assessing their biocompatibility in deep cavities is crucial for clinical success.
• Self-adhesive and self-etching luting agents require thorough evaluation.

Purpose of the Study:

• To radiographically and histologically evaluate pulpal and periapical tissue responses to self-adhesive (Rely X™ Unicem) and self-etching (Multilink®) resin-based luting materials.
• To compare these responses with control materials (zinc phosphate cement and gutta-percha).
• To assess the suitability of these materials for deep dentin cavities without pulp exposure.

Main Methods:

• Preparation of deep Class V cavities (0.5-mm dentin thickness) in 60 canine premolars.
• Application of Rely X™ Unicem, Multilink®, zinc phosphate cement, or gutta-percha to cavity floors.
• Restoration of cavities with silver amalgam and evaluation at 10 and 90 days post-procedure.
• Radiographic and histopathological analysis of pulp and periapical tissues.

Main Results:

• All tested materials exhibited similar histopathological features and radiographic findings at both time points.
• Pulp tissue remained intact with no signs of inflammation or damage.
• Apical and periapical regions, periodontal ligament thickness, lamina dura, and surrounding bone showed normal radiographic and histological appearance.
• No inflammatory cells, tissue resorption, or bacterial presence were observed.

Conclusions:

• Rely X™ Unicem and Multilink® demonstrated no adverse tissue reactions in deep dentin cavities.
• These resin-based luting materials are biocompatible and suitable for cementation of indirect restorations in deep cavities without pulp exposure.
• The study supports the clinical indication of these materials for specific restorative procedures.