ABSTRACT
The aim of this systematic review was to analyze and compare the most up-to-date information available on long-term, medium-term, and short-term survival rates of porcelain laminate veneers (PLVs) and investigate the homogeneity in current studies or lack of it. An electronic search was performed using PubMed, Ovid MEDLINE, Cochrane Library, Web of Science, EBSCO, Science Direct, Wiley, and Scopus databases. Based on the PRISMA guidelines, the main inclusion criteria consisted of research articles published after the year 2000, in vivo studies with a follow-up period of at least 1 year and reporting of the Kaplan-Meier estimated cumulative survival rates. Quality assessment of the included studies was performed using the modified systematic assessment list consisting of 24 items. Thirty full-text articles were reviewed in detail. A total of 30 articles met the inclusion criteria and were selected for qualitative synthesis. The remaining 27 publications were retained to discuss the heterogeneity in the current literature and reported longevity of veneer restorations. A conclusive estimation of the longevity of PLVS beyond 20 years is lacking. The availability of evidence in the current literature is limited in terms of sample size and duration of follow-up. However, the majority of studies have concluded that PLVs have high-success rates and predictable patient outcomes. The present literature indicates an increased heterogeneity among research study designs. Researchers should aim for homogeneous study designs that can be included in systematic reviews and meta-analyses.
ABSTRACT
PURPOSE: To compare the effect of polishing systems on surface roughness of nanohybrid and microhybrid resin composites. METHODS: Two types of restorative resin composites and two one-step polishing systems were used in this study (IPS Empress Direct as the nanohybrid resin composite and Filtek P90 as the microhybrid). A total of 120 discs were fabricated (n=120). The specimens were divided into six groups of n=20 each. For polishing systems, PoGo One-Step Diamond Micro-Polisher and OptraPol Next Generation were selected. The before and after mean Ra values were recorded using a surface profilometer. Results were statistically analyzed with the Kruskal-Wallis H and the Mann-Whitney U tests. A P-value of ≤0.05 was considered statistically significant. RESULTS: PoGo polishing system recorded the lowest surface roughness, in case of both nano and microhybrid composites, with mean Ra values of 0.060 µm and 0.108 µm, respectively. PoGo also produced maximum reduction in the surface roughness in the nanohybrid group with 56.83%. OptraPol recorded a comparatively similar mean Ra value of 0.067 µm for the nanohybrid composites but recorded the least reduction in surface roughness with 48.41% for the microhybrid group. CLINICAL SIGNIFICANCE: One-step diamond polishing systems combined with nanohybrid resin composites exhibit increased surface smoothness compared to microhybrids.