Oral Health and Dental Management

Evaluation of mechanical properties and cell response of glass infiltrated zirconia after sandblasting

12^th World Congress on Dentistry and Oral Health

August 04-05, 2016 Manchester, UK

Sang-Won Park

Chonnam National University, Republic of Korea

Posters & Accepted Abstracts: Oral Health Dent Manag

Abstract:

Zirconia surface modification technique, especially, glass infiltrated zirconia method is one of the most effective methods in producing a composite with more desirable properties than the individual components. The aim of this in vitro study was to evaluate the mechanical properties and initial cell response of glass infiltrated zirconia ceramic before and after sandblasting. One hundred zirconia specimens were divided into the following four groups, according to the surface treatments: Untreated zirconia (control), sandblasted zirconia (S), glass infiltrated zirconia (G), and sandblasted glass infiltrated zirconia (GS). Surface roughness (Ra) was determined using a nano-surface 3D optical profiler. Biaxial flexural strength was measured by Universal Testing Machine (UTM), according to ISO 6872. Vickers indentation test was performed to estimate the material hardness (Hv). MC3T3 osteoblastlike cells proliferation and attachment were examined for 1 day and 3 days. Glass infiltration depth, surface morphology, and indentation patterns were characterized under a high-resolution Field Emission Scanning Electron Microscopy (FE-SEM). Oneway analysis of variance (ANOVA) and Tukey�??s HSD pairwise multiple comparisons were performed on the entire test. GS group showed a slight decrease in hardness, but revealed the improvement of flexural strength (686.2 MPa). After sandblasting, GS group had the highest surface roughness (Ra=1.24 μm) compared to the other groups, and supported an enhanced osteoblast cells response than the untreated zirconia. FE-SEM images of the glass infiltrated zirconia surface microstructure showed a smooth surface before sandblasting. After sandblasting, the new surface exhibited roughness with the formation of shallow irregularities. The results of this study indicated the beneficial influence of graded structures in the design of zirconia implant, possibly also all-ceramic crowns and ridges restoration. Hence, the glass infiltrating process could be used as a promising method to enhance the mechanical properties with better surface roughness of zirconia implant for osteoblast cells response. Limitation of this study related to the experiment conditions which may differ from the actual clinical situation.

Biography :

Email: psw320@chonnam.ac.kr