Optimization of ZnO-Based Polymer Infiltrated Ceramic Networks for Dental Applications
Objectives: The aim of this study was to evaluate the influence of weight ratio, shape of the precursor particles and application of a MDP-containing primer on the flexural strength, flexural modulus and wear behavior of polymer infiltrated ceramic networks (PICN) using zinc oxide. Methods: Two different types of zinc oxide particles (sail and tetrapodal structure) were used as precursors to produce ZnO-networks by sintering, each with two different densities resulting in different weight ratios (75 wt.% ZnO and 60 wt.% ZnO) of the PICN. For each of these different networks two subgroups were created depending on whether or not a MDP-containing primer was applied before infiltration of Bis-GMA/TEGDMA. Flexural strength and flexural modulus were determined by using the three-point-bending test with bar-shaped specimens (2x2x25 mm3, N=10 per group). Vertical substance loss by chewing simulation of disc-shaped specimens (diameter=12 mm, thickness=1.2 mm, N=8 per group) was evaluated using laser scanning microscopy. Results: Using tetrapodal structured particles as precursors and the use of a primer led to a statistically significant higher flexural strength, which ranged from 37.8 MPa (sail, 60 wt.%, no primer) to 102.8 MPa (tetrapodal, 60 wt.%, primer). The mean flexural modulus ranged from 4.6 GPa (sail, 60 wt.%, no primer to 14.2 GPa (sail, 75 wt.%, primer). All three investigated factors showed a statistically significant influences at least in some cases. Only few statistically significant differences were found for the vertical substance loss which ranged from 213 µm (tetrapodal, 60 wt.%, primer) to 854 µm (sail, 75 wt.%, no primer). Conclusions: By varying the shape of the particles and the weight fraction of zinc oxide, the mechanical properties of ZnO-based PICN can be controlled. The use of a phosphate monomer containing primer strengthens the bond between the polymer and the zinc oxide, thus increasing the strength of the composite.
2024 IADR/AADOCR/CADR General Session (New Orleans, Louisiana) New Orleans, Louisiana
2024 0987 Dental Materials 1: Ceramic-based Materials
Wille, Sebastian
( Christian-Albrechts University
, Kiel
, Germany
; Kiel University
, Kiel
, Germany
)
Scherer, Franziska
( Christian-Albrechts University
, Kiel
, Germany
)
Saure, Lena
( Christian-Albrechts University
, Kiel
, Germany
)
Schütt, Fabian
( Christian-Albrechts University
, Kiel
, Germany
; Kiel University
, Kiel
, Germany
)
Adelung, Rainer
( Christian-Albrechts University
, Kiel
, Germany
; Kiel University
, Kiel
, Germany
)
Kern, Matthias
( Christian-Albrechts University
, Kiel
, Germany
; Kiel University
, Kiel
, Germany
)
NONE
Poster Session
Biological Properties of Ceramics and Experimental Materials
Thursday,
03/14/2024
, 03:45PM - 05:00PM