EFFECT OF SURFACE ROUGHNESS ON ACCUMULATION OF STREPTOCOCCUS MUTANS IN NANOFILLED TOOTH COLOURED RESTORATIVE MATERIALS

Abd Rahman R, Mohamad D , Ab Ghani Z, Hasan H and Abdullah NA3

Abstract

EFFECT OF SURFACE ROUGHNESS ON ACCUMULATION OF STREPTOCOCCUS MUTANS IN NANOFILLED TOOTH COLOURED RESTORATIVE MATERIALS

Abd Rahman R¹, Mohamad D^1[1], Ab Ghani Z¹, Hasan H² and       Abdullah NA³

¹School of Dental Sciences, ²School of Medical Sciences, ³School of Health Sciences, Universiti Sains Malaysia,

16150 Kubang Kerian, Kelantan, Malaysia

The objective of the study was to asses the adhesion of Streptococcus mutans on nanofilled and microfilled composite resin and glass ionomer cement restorative materials. Glass ionomer cements; Ketac^TM N100 (nanofilled) and Fuji IITM LC (microfilled) and composite resins; Filtek^TM Z350 (nanofilled) and Filtek^TM Z250 (microhybrid) were packed in acrylic mould of 2 mm thickness and 5 mm diameter. All samples were light-cured and polished with Sof-Lex discs. All materials were cultured with the exponential phase of S. mutans cultivation. Surface roughness values were assessed using Atomic Force Microscope (AFM, Ambios, USA) at time intervals (7hrs, 24 hrs, 7 days, 14 days and 21 days). The morphology of S. mutans on materials was observed after 24 hour incubation of S. mutan on materials under Scanning Electron Microscope (SEM, Quanta FEG 450). Within groups, results showed that both nanofilled materials had lower surface roughness and less adhesion of S. mutans compared to microfilled materials. This study would enhance the clinical knowledge especially in aesthetic area and improve the longevity of the dental restoration

Keywords: Streptococcus mutans, surface roughness, nanofilled materials, fluoride

[1] Corresponding author: Tel: +6 09 767 5807

E-mail: dasmawati@usm.my