Bacterial leakage around dental restorations: its effect on the dental pulp

Abstract

This study revealed that the quantity of baeteria filtered from the base of Class V cavity restorations were directly related to the type of medicament used. Of the brands studied: composite, amalgam, sitieate, and guttapereha -eaeh produeed varying numbers of bacterial eolonies, whereas zinc oxide and eugenol eement showed none. Histopathology of the pulps eorrelated direetly to the mierobiologieal data.

Evaluation of the adaptation of zirconia-based fixed partial dentures using micro-CT technology

“…A large marginal gap is also related to a more rapid rate of cement dissolution, which is conducive to the percolation of food, oral debris and other substances that are potential irritants to the vital pulp. [14][15][16] On the other hand, wider gaps are currently more accepted, in view of the evolution of adhesive luting materials and protocols.…”

“…12,13 For this reason, restoration fit is an important factor for restoration prognosis, insofar as poor marginal adaptation results in dissolution of the luting agent and favors microleakage of bacteria and their byproducts, thus increasing tooth susceptibility to inflammation of the vital pulp, secondary caries, and marginal discoloration. [14][15][16] The CAD-CAM technique uses a series of processing steps, such as scanning, software designing, milling and sintering, which may interfere with the precision of fit of the restoration. Although the sintering shrinkage of restorations obtained from partially sintered blocks can be compensated by milling enlarged restorations, it is not as yet clear whether this compensation is effective for the production of FPDs with long spans.…”

Antibacterial effects of three experimental quaternary ammonium salt (QAS) monomers on bacteria associated with oral infections

“…However, cariogenic bacteria such as Streptococcus mutans (S. mutans) tend to accumulate and propagate more readily on the surfaces of cured composite resin restorations in the oral cavity than on the surfaces of restorations made with other materials. In addition, microleakage caused by the shrinkage of composite resin during curing has always occurred between resin-dentinal interfaces, and allows bacteria to invade deeply, frequently resulting in postoperative complications, including recurrent caries, postoperative sensitivity, marginal discoloration, and pulp inflammation (2). Recently, the concept of minimal intervention dentistry (MI) is being more widely accepted by clinicians (3), so that conservation of the infected tooth structure has become more important.…”

Crowns and extra-coronal restorations: Endodontic considerations: the pulp, the root-treated tooth and the crown

“…Bacteria and their metabolic by-products are the greatest danger to pulp health, 24,25 and it behoves the practitioner to ensure that temporary and permanent crowns fit accurately and provide the best possible marginal seal. The pre-sealing of dentine with a resin-bonding agent may be a means of reducing dentine permeability and enhancing pulp protection, 26 though there are few published data to date which specifically demonstrate the effectiveness of this action in preserving the pulps of crown-prepared teeth.…”