European Journal of Prosthodontics and Restorative Dentistry

cover art

Cover Date:
September 2018
Print ISSN:
0965-7452
Electronic ISSN:
2396-8893
Vol:
26
Issue:
3

Effect of Bioactive Composites on Microhardness of Enamel Exposed to Carious Challenge

This study verified if experimental composites containing calcium phosphate nanoparticles exert a protective effect against enamel demineralization. Three experimental resin-based composites containing 60 vol% of fillers were manipulated. Filler phase was constituted by silanized barium glass and 0%, 10% or 20% (by volume) of dicalcium phosphate dihydrate (DPCD) nanoparticles functionalized with the monomer triethylene glycol dimethacrylate (TEGDMA). Cavities (10 x 2 x 2 mm) were prepared in bovine enamel and restored using one of the experimental materials (n=10). Specimens were exposed to pH cycling (demineralizing solution: pH 5.0/4h, remineralizing solution: pH 7.0/20h, 14 days). Enamel Knoop microhardness (100g/10s) was measured on the surface (SH) and after transversal sectioning up to 90 μm depth (cross-sectional microhardness, CSH). Microhardness values and the percent of microhardness loss were
analyzed ANOVA/Tukey test and Student’s paired t-test (alpha: 5%). The materials did not differ in respect to SH. Enamel adjacent to DCPD-containing composite restorations showed smaller reductions in CSH (-1.2% to -3.5%) than the enamel from control group (-12.5%), while CSH of enamel restored with resin-modified glass ionomer was similar to
the other groups (-4.5%). DCPD-containing composites reduced enamel demineralization in comparison to a conventional composite.

Keywords
Composite
Microhardness
Calcium Phosphate
Bioactive

doi: 10.1922/EJPRD_01781Pinto07

Article Price
£15.00
Institution Article Price
£
Page Start
122
Page End
128
Authors
Mirella Flávia Corrêa Pinto, Dr. Yvette Alania, Livia Camargo Natale, Prof. Ana Carolina Magalhães, Prof. Roberto Ruggiero Braga

Articles from this issue

  • Title
  • Pg. Start
  • Pg. End

  1. Accuracy of Intraoral Scanners: A Systematic Review of Influencing Factors
  2. 101
  3. 121

  1. Effect of Bioactive Composites on Microhardness of Enamel Exposed to Carious Challenge
  2. 122
  3. 128

  1. Comparative Evaluation of Surface Defects In Single File Rotary Systems Before and After Instrumentation In Curved Root Canals
  2. 130
  3. 135

  1. Effect of Zirconia Pigmentation on Translucency
  2. 136
  3. 142

  1. The Effect of Try-In Paste and Resin Cement Shade on Colour Properties of Dental Veneers
  2. 144
  3. 151

  1. Clinical Evaluation of SonicActivated High Viscosity Bulk-Fill Nanohybrid Resin Composite Restorations in Class II Cavities: A Prospective Clinical Study up to 2 Years
  2. 152
  3. 160