Tooth Substrate vs Conventional Materials Used as a Base in Class V Cavities: A Comparative Study
Year: 2025
Type: article
Abstract: cements (RMGICs)-which can be used as a base under the laminate technique.3 RMGICs were developed to overcome several drawbacks of CGICs, including early moisture sensitivity, 4 low working time, and slow setting reaction.5 RMGICs have higher tensile and fracture strengths, 6,7 enhanced working time, rapid setting with light curing, 8 and improved chemical solubility compared to CGICs. 5 RMGICs have significantly improved cohesive strength and better bonding to tooth structure.6,9 GIC was developed in an attempt to overcome the flaws of silicate cements while retaining their advantages.This cement combines the strength, rigidity, and fluoride-releasing properties of silicate particles with the biocompatibility and adhesive properties of polyacrylic acid.The result is a hybrid silicate/polycarboxylate cement made of calcium fluoroaluminosilicate glass powder and IntroductIonThe primary requirement of materials used for the restoration of teeth is good adaptation and proper sealing of the cavity walls for the longevity of the restoration.Historically, liners and bases have been widely advocated beneath restorations, especially when significant dentin removal occurs during cavity preparation.However, numerous studies have established that microbial leakage is the primary cause of pulpal inflammation beneath restorations rather than direct irritants released from filling materials.According to Summit, a base can be defined as a "dentin replacement material used for bulk replacement of missing tooth structure to allow the material in the restoration to have less bulk, or for blocking out undercuts for indirect restorations."The material used as a base should possess sufficient modulus of elasticity and strength to prevent pulpal damage that may result from temperature changes and to absorb occlusal forces.Glass ionomer cement (GIC) has traditionally been used as a base under composite restorations.Glass ionomers were developed as an alternative to silicate cements while utilizing their advantages.It is recommended that a large part of dentin be replaced with GIC before applying the resin composite to reduce polymerization shrinkage in large composite restorations.This forms the basis of the sandwich technique or bilayered technique.1,2 Using this technique, it is possible to combine the benefits of both glass ionomers and resin composite in a single restoration, thereby reducing polymerization contraction and the C-factor, resulting in restorations that are highly durable.There are two main types of polyalkenoate cements-conventional glass ionomer cements (CGICs) and resin-modified glass ionomer 1-
Language: English
Subfield: Orthodontics
Field: Dentistry
Domain: Health Sciences
Open Access status: diamond
OpenAlex ID: W4410179711