Microleakage Evaluation of Minimally Invasive Class I Flowable Composite Restorations

• Main Author: Davis, Dilu
• Format: Dissertation
• Language: English
• Published: ProQuest Dissertations & Theses 01-01-2016
• Subjects: Adhesion; Adhesives; Bond strength; Chemical bonds; Chemistry; Chi-square test; Composite materials; Dental enamel; Dentin; Dentistry; Industrial engineering; Load; Manufacturing; Materials science; Mechanical properties; Mechanics; Molecular weight; Nanoparticles; Nanotechnology; Performance evaluation; Polymerization; Resins; Sealing compounds; Teeth; Thermal cycling; Thermodynamics; Viscosity
• ISBN: 9798380055468

BackgroundMinimally invasive flowable composite class I restorations have gained widespread use because of their pleasing esthetics. Despite recent developments in dentine bonding systems, flowable composite resins and restorative procedures, microleakage resistance of the restoration-tooth surface interface remains problematic. Loss of adhesion and micro gap formation may allow microleakage of bacteria and their toxic products; these contribute to post-operative tooth sensitivity, development of secondary caries, pulpal disease, marginal straining and restoration failure.Aim of the StudyThe aim of this study was to compare the microleakage resistance of four different flowable composite resins to that of a micro hybrid composite when placed in minimally invasive occlusal restorations.Methodology40 freshly extracted human posterior teeth were divided into 4 test groups and 1 control group. Minimally invasive class I cavities were prepared using fissurotomy bur of 3 mm length from mesial to distal, 0.6 mm width and 1.5 mm depth. Four test groups were restored with Beautifil Flow, Filtek Z350 XT, Tetric N Flow and Esthet X Flow and the control group was filled with Filtek P60. The samples were thermocycled and then coated with nail polish and immersed in methylene blue dye and then sectioned and viewed under tool maker’s microscope. The microleakage was scored and the results were statistically analyzed using ANOVA and post hoc Tukey’s test.ResultsMicrohybrid composite resin (Filtek P60) showed the least microleakage and the results were statistically significant (p=0.01).Among the flowable composites, Filtek Z 350 XT showed the least amount of microleakage and was statistically significant (p=0.01)ConclusionIt can therefore, be concluded that microhybrid composite is the material of choice for restoration in minimally invasive class I cavities, but further clinical research is still needed in order to substantiate these results, due to certain limitations of the study.