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endodontics - 3 Questions
An ideal root canal sealer should have all the mentioned properties: 1) Fills the space between cone and canal walls - primary mechanical function, 2) Should have antibiotic properties - to eliminate residual bacteria and prevent reinfection, 3) Should be biologically acceptable - biocompatible with periapical tissues, non-toxic, and non-irritating, 4) Additional ideal properties include: dimensional stability, easy mixing and placement, radiopacity, and easy removal if retreatment needed. No current sealer meets all ideal requirements completely, but these remain the goals for sealer development.
The main objective of obturation is to fill the canal and prevent apical percolation of fluids. This primary goal involves: 1) Creating a fluid-tight seal at the apical foramen, 2) Preventing bacterial penetration from oral cavity, 3) Eliminating pathways for tissue fluid seepage, 4) Preventing recontamination of treated root canal system. While preventing discoloration and providing support for restoration are secondary benefits, the fundamental purpose is to achieve biological seal that prevents apical periodontitis by eliminating bacterial access to periapical tissues.
The most desirable healing response is cementum deposition at the apical foramen, which seals the apex and maintains the periodontal ligament space. This represents optimal biological healing.
MCQ