Avaliação do desempenho da resina bisacrílica em restaurações provisórias

Abstract

The Article 1 aimed to review the chemical, physical and biological properties of commercially available bis-acryl resins and to compare their performance to acrylic resins or composites used on provisional restorations. Nine databases were screened: PubMed (Medline), Web of Science, Cochrane, Scopus, Lilacs, Ibecs, BBO, Scielo and Google Scholar. All studies evaluating the performance of the bis-acryl resin were included. In total, 932 studies were identified through database search and after duplicate removal, 567 were selected, 169 were selected for full-text analysis, and 118 remaining articles met the inclusion criteria and were included in the qualitative analysis; Of these, 99 studies were included in the meta-analysis. The bis-acryl resins had a better performance in most of the mechanical properties and obtained similar performance to acrylic or composite resins in some analyzes, such as flexural strength, marginal precision, temperature increase and cytotoxicity. In general, the results indicated that there is no ideal provisional material that satisfy all chemical, physical, biological properties and suit all situations. The second article evaluated the influence of different adhesive strategies on the shear bond strength (SBS) of the bis-acryl resin to enamel surface, enamel surface roughness (Ra) and color variation (ΔE00) were evaluated. Sixty bovine incisors were selected and randomly divided into six groups (n = 10) according to the adhesive strategy used: (BRControl: bis-acryl resin Protemp 4); (Spot-etch+BR: spot-etch + bis-acryl resin); (Spot-etchSB2+BR: spot-etch + Single Bond 2 adhesive + bis-acryl resin); (Spot-etchZ350Flow+BR: spot-etch + flow resin Filtek Z350 XT Flowable + bis-acryl resin); (SBU+BR: Single Bond Universal adhesive + bisacryl resin); (Spot-etchSBMP+Z350: spot-etch + Scotch Bond Multi-purpose adhesive + composite resin Z350 XT). Ra was determined by a surface profilometer, color variation CIEDE2000 (ΔE00) was calculated, SBS test was performed on a universal test machine and failure modes were classified under magnification (40x). The unidirectional analysis of variance revealed that BRControl presented the lowest SBS values with significant differences in relation to the other groups. The use of the spotetch technique promoted the highest SBS values found. The predominance of adhesive failure was observed in all groups. Paired t-test found significant difference between the basal and final values of Ra for all groups. All experimental groups presented values of ΔE00 above 1.8, which is the value of the acceptability threshold for CIEDE2000. The use of the spot-etch technique may increase the SBS bis-acryl resin to the enamel during the provisional restoration step, however may alter the roughness of the enamel surface.