The degree of conversion of different types of resin-matrix cements used in dentistry: an integrative review

• Autor(a) principal: Santos, Marcionilia de Souza dos
• Data de Publicação: 2022
• Tipo de documento: Dissertação
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/20.500.11816/4111
• topic: Resin cements; Restorative dentistry; Polymerization; Degree of conversion

Purpose: The main aim of the present study was to carry out an integrative review on the degree of conversion of the organic matrix of different resin cements used in dentistry. Method: A bibliographic review was performed on PubMed using the following search items: “degree of conversion” OR “filler” AND “resin cement” OR “inorganic cement” AND “organic” OR “radiopacity” OR “refractive” OR “transmittance” OR “type” AND “resin composite.” The search involved articles published in English language in the last 10 years. Results: Within the 15 selected studies, 8 studies reported a high degree of conversion (DC) of the organic matrix ranging from 70 up to 90% while 7 studies showed lower DC values. Dual-cured resin-matrix cements revealed the highest mean values of DC, flexural strength, and hardness when compared with light- and self-polymerized ones. DC mean values of resin-matrix cements light-cured through a ceramic veneer with 0.4 mm thickness was higher (~83%) than those recorded for resin-matrix cements light-cured through a thicker ceramic layer of 1.5 mm (~77%). Conclusions: The highest percentage of degree of conversion of monomers was reported for dual-cured resin-matrix cements and therefore both chemical and light-induced pathways promoted an enhanced polymerization of the material. Similar degree of conversion of the same resin-matrix cement were recorded when the prosthetic structure with low thickness. On thick prosthetic structures, translucent materials are required to allow the light transmission achieving the resin-matrix cement.