<p>Cavity Bases Revisited</p>

Abstract

Objective The aim of this paper was to review the current literature on cavity bases while focusing on the role of zinc oxide eugenol (ZOE) and resin-modified glass ionomers (RMGI) as cavity bases. Materials and Methods A thorough literature search between 1970 and 2020 was done using Scopus, PubMed, and Google Scholar databases. The keywords of the search strategy were as below: cavity liners and bases, pulp protection, zinc oxide eugenol, and resin-modified glass ionomer. No specific inclusion or exclusion criteria were applied as to what articles would be included in this review. Conclusion This review emphasizes that the available literature provides very little evidence to support the routine use of a base under amalgam or composite restorations. This review favors the adoption of “no more lining or bases” in shallow and moderate cavity preparations. However, an exception might be a “protective base” of RMGI following the application of calcium hydroxide (CH) liners in deep cavities. Bonded RMGIs are suitable cavity base materials and should always replace zinc oxide eugenol bases in daily practice.

Effect of Bioinductive Cavity Liners on Shear Bond Strength of Dental Composite to Dentin

“…These materials can seal dentinal tubules and protect the pulp from microorganisms' attacks and also have therapeutic effects and irritants as well as thermomechanical stimuli [ 2 ]. Various materials have been used as cavity liners, including resin-modified glass ionomer cement, calcium silicate-based liners, calcium hydroxide liners, and bioactive glass-based cement [ 1 , 3 , 4 ].…”

“…Furthermore, the adaptation of RMGIC over some liners has been advised; for instance, in order to overcome the drawbacks of calcium hydroxide liners, a protective layer of RMGIC base over this liner is recommended, especially in deeper cavities. To illustrate, RMGIC can act as an insoluble barrier and prevent the microorganism from proceeding toward the pulp at the time when microleakage occurs [ 4 ].…”

Comparative Evaluation of Shear Bond Strength of Composite to Dentin in Presence of Calcium Releasing Liners: An In-Vitro Study

“…Protective dental liners are applied in deep cavities to protect the pulp from different stimuli and facilitate the formation of reparative dentine [1]. These materials can seal dentinal tubules and protect the pulp from microorganisms' attacks and also have therapeutic effects and irritants as well as thermomechanical stimuli [2].Various materials have been used as cavity liners, including Resin Modified Glass Ionomer Cement, calcium silicate-based liners, calcium hydroxide liners, and bioactive glass-based cement [1,3,4] Traditionally, calcium hydroxide has been considered the gold standard of cavity lining materials for several years, in the case of direct and indirect pulp capping treatment procedure due to excellent antibacterial properties, alkaline pH, and its bioactivity in terms of formation of hard tissue barrier [5]. However, the unfavorable effects of calcium hydroxide, such as the weak physical properties, tunnel defects, high solubility, and gradual dissolution, led to a decline in its use as a liner with time [6], to overcome these undesirable drawbacks, several other materials have been introduced, light-activated calcium hydroxide lining materials were one of them which provides improved physical properties, decreased solubility in acids and water, although their bond to the substrate is weak and can shrink during polymerization.…”

“…Furthermore, the adaptation of RMGIC over some liners has been advised; for instance, in order to overcome the drawbacks of calcium hydroxide liners, a protective layer of RMGI base over this liner is recommended, especially in deeper cavities. To illustrate, RMGIC can act as an insoluble barrier and prevent the microorganism from proceeding toward the pulp at the time when microleakage occurs [4].…”

Comparative evaluation of shear bond strength of composite to dentin in presence of different dental liners: An in-vitro study

“…Furthermore, the adaptation of RMGIC over some liners has been advised; for instance, in order to overcome the drawbacks of calcium hydroxide liners, a protective layer of RMGI base over this liner is recommended, especially in deeper cavities. To illustrate, RMGIC can act as an insoluble barrier and prevent the microorganism from proceeding toward the pulp at the time when microleakage occurs [4]. Activa BioActive BASE/LINER was introduced by Pulpdent Corporation in 2014.…”