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Abstract(s)
Introdução: As resinas compostas são amplamente usadas na medicina dentária restauradora pelas propriedades mecânicas, estéticas e biocompatibilidade. O sucesso das restaurações depende da microestrutura do material e da correta fotopolimerização. Objetivo: A presente revisão sistemática teve como objetivo avaliar o grau de conversão e a microdureza das resinas compostas convencionais e bulk-fill durante os procedimentos de fotopolimerização. Materiais e métodos: Foi realizada uma revisão bibliográfica nas bases de dados Pubmed, Scopus e Web of Science, utilizando os seguintes palavras-chave: resin composites AND degree of conversion AND microhardness AND light curing unit OR photoinitiator OR light curing distance OR polymerization distance OR exposure time. Foram incluídos artigos em língua inglesa, entre janeiro de 2010 e dezembro de 2023, que relacionavam diferentes tipos de fotoativação com o grau de conversão de monómeros e a microdureza em resinas compostas convencionais e bulk-fill. Resultados: Os estudos mostram que o grau de conversão e a microdureza diminuem com a profundidade e com menor tempo de exposição. Foi observada uma correlação linear entre o grau de conversão, a microdureza e o índice de refração. A microdureza das diferentes resinas compostas foi afetada pelo espectro de emissão, pela irradiância das unidades de fotopolimerização, pelas partículas inorgânicas, e pela utilização de fotoiniciadores alternativos que permitiram um aumento da microdureza na superfície com luzes largo espetro, contrariamente em profundidade a microdureza diminuiu devido à menor quantidade de luz violeta. Valores similares ou superiores de grau de conversão e microdureza foram obtidos com 1200 mW/cm² comparado a 3600 mW/cm². A distância de polimerização afeta as propriedades físicas e durabilidade das resinas compostas. Conclusão: A microdureza reflecte a eficiência da polimerização devido à sua correlação com o grau de conversão. As resinas compostas convencionais e bulk-fill têm microestruturas semelhantes, mas diferem na formulação química do fotoiniciador, o que afeta a escolha das unidades de fotopolimerização necessárias para os bulk-fill.
Introduction: Resin composites are widely used in restorative dentistry due to their mechanical properties, aesthetics, and biocompatibility. The success of restorations depends on the material's microstructure and proper photopolymerization. Objective: This systematic review aimed to evaluate the degree of conversion and microhardness of conventional and bulk-fill composite resins during photopolymerization. Materials and methods: A bibliographic review was performed on Pubmed, Scopus and Web of Science using the following key terms: resin composites AND degree of conversion AND microhardness AND light curing unit OR photoinitiator OR light curing distance OR polymerization distance OR exposure time. The search included articles in English language between January 2010 and December 2023, that related different types of photoactivation with the degree of monomers conversion and microhardness in conventional and bulk-fill resin-matrix composites. Results: Studies show that the degree of conversion and microhardness decrease with depth and shorter exposure time. A linear correlation between the degree of conversion, microhardness, and refractive index was observed. Different resin-matrix composites were affected by the emission spectra and irradiance of light-curing units, inorganic particles, also alternative photoinitiators increased microhardness on the surface with wide range lights, however this was not observed on the bottom due to lower violet light amount. Similar or higher conversion degree and microhardness values were obtained with 1200 mW/cm² compared to 3600 mW/cm². The polymerization distance affects the physical properties and durability of the resin composites. Conclusion: Microhardness reflects polymerization efficiency due to its correlation with the degree of conversion. Conventional and bulk-fill resin composites have similar microstructures but differ in photoinitiator chemistry, affecting the choice of light curing units needed for bulk-fill composites.
Introduction: Resin composites are widely used in restorative dentistry due to their mechanical properties, aesthetics, and biocompatibility. The success of restorations depends on the material's microstructure and proper photopolymerization. Objective: This systematic review aimed to evaluate the degree of conversion and microhardness of conventional and bulk-fill composite resins during photopolymerization. Materials and methods: A bibliographic review was performed on Pubmed, Scopus and Web of Science using the following key terms: resin composites AND degree of conversion AND microhardness AND light curing unit OR photoinitiator OR light curing distance OR polymerization distance OR exposure time. The search included articles in English language between January 2010 and December 2023, that related different types of photoactivation with the degree of monomers conversion and microhardness in conventional and bulk-fill resin-matrix composites. Results: Studies show that the degree of conversion and microhardness decrease with depth and shorter exposure time. A linear correlation between the degree of conversion, microhardness, and refractive index was observed. Different resin-matrix composites were affected by the emission spectra and irradiance of light-curing units, inorganic particles, also alternative photoinitiators increased microhardness on the surface with wide range lights, however this was not observed on the bottom due to lower violet light amount. Similar or higher conversion degree and microhardness values were obtained with 1200 mW/cm² compared to 3600 mW/cm². The polymerization distance affects the physical properties and durability of the resin composites. Conclusion: Microhardness reflects polymerization efficiency due to its correlation with the degree of conversion. Conventional and bulk-fill resin composites have similar microstructures but differ in photoinitiator chemistry, affecting the choice of light curing units needed for bulk-fill composites.
Description
Keywords
Resina composta Grau de conversão Microdureza Unidade de fotopolimerização Fotoiniciador Tempo de exposição Resin composites Degree of conversion Microhardness Light curing unit Photoinitiator Exposure time