Experimentally induced resorption cavities in rat molars.

Area of Science:

• Dental research
• Oral biology
• Histology

Background:

• Resorption cavities are observed on tooth surfaces.
• The role of transseptal fibers in tooth repair is not fully understood.

Purpose of the Study:

• To investigate the incidence and ultrastructure of resorption cavities in albino rat molars following surgical injury.
• To examine the process of repair in experimentally induced resorption cavities.

Main Methods:

• Transection of the transseptal fiber system between maxillary molars in 30 albino rats.
• Specimen preparation for light and electron microscopy at various time points (1-21 days post-surgery).
• Comparison with control teeth from unoperated rats.

Main Results:

• Normal teeth showed no resorption cavities in interproximal areas, but minor ones with cemental repair on root surfaces.
• Surgical injury led to extensive resorption cavities in dentin and cementum.
• Arrest of resorption and initial repair, involving connective tissue fiber attachment to collagen, were observed by 14 days.

Conclusions:

• Surgical injury triggers significant resorption cavity formation in rat molars.
• The repair process involves connective tissue integration with exposed collagen, potentially mediated by a granular material.
• Ultrastructural evidence suggests a mechanism for initial fibril attachment during repair.