Do polywave leds increase the degree of conversion in restorative composites? A systematic review
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Data
2023-12-14Primeiro membro da banca
Gonçalves, Luciano de Souza
Segundo membro da banca
Montagner, Anelise Fernandes
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Alternative photoinitiators have been developed with the aim of producing restorative composites with superior optical qualities without compromising mechanical properties. However, composites with these photoinitiators require a light source with an extended emission spectrum, with emission peaks at more than one wavelength, resulting in polywave emitted diode light (LEDs) sources. Several in-vitro studies evaluated the degree of conversion (CD) produced by these LEDs compared to traditional ones, in different restorative composites to verify the efficiency of the generated polymerization. The objective of this study was to systematically review the literature for laboratory studies that evaluated the influence of LEDs on the DC of restorative resin composites. The search was carried out in the PubMed, Scopus and Web of Science electronic databases based on the strategy created by combining specific (MeSH) and free terms, without date or language restriction based on the research question: polywave LEDs increase the degree of conversion into restorative composites? Two reviewers independently selected the studies following the inclusion criteria: direct assessment of DC, comparing groups of monowave and polywave light sources. Studies that did not show mean and standard deviation in numeric values for the degree of conversion, evaluated chemical or dual setting materials were excluded. Of 44 eligible environmental studies 21 were selected for full reading. Of these, 16 were included and, through searching their references, 5 more studies were included, totaling 21 articles in the systematic review and meta-analysis. Two reviewers selected the studies and extracted pertinent data such as: author, year, country, material evaluated, light source used, radiant exposure, depth, storage and DC values. A meta-analysis was performed using the Z test with random effects and a significance level of 5%, comparing DC data (mean and standard deviation) generated by polywave and monowave LEDs. The risk of bias analysis was calculated using specifications adapted from a previous systematic review, categorizing primary studies as high, medium or low. The meta-analysis showed a significant positive difference in favor of polywave LEDs (Z=3.74; p=0.0002), with high heterogeneity I2=92%. Most of the included studies (18) presented a high risk to life. It is concluded that the currently available in vitro data allows us to infer that polywave LEDs promote greater DC compared to monowave LEDs.
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