Abstract
(computer-aided design-computer-aided manufacturing) CAD/CAM monolithic restorations connected to zirconia abutments manufactured with a chairside workflow are becoming a more common restorative option. However, their mechanical performance is still uncertain. The aim of this study was to evaluate the mechanical behavior of a combination of a zirconia abutment and monolithic all-ceramic zirconia and lithium disilicate crown manufactured with a chairside workflow, connected to titanium implants with two types of internal connection—tube in tube connection and conical connection with platform switching. They were thermally cycled from 5 °C to 55 °C and were subjected to a static and fatigue test following ISO 14801. The fractured specimens from the fatigue test were examined by SEM (scanning electron microscopy). Simulations of the stress distribution over the different parts of the restorative complex during the mechanical tests were evaluated by means of (finite element analysis) FEA. The mechanical performance of the zirconia abutment with an internal conical connection was higher than that of the tube in tube connection. Additionally, the use of disilicate or zirconia all-ceramic chairside CAD/CAM monolithic restorations has similar results in terms of mechanical fracture and fatigue resistance. Stress distribution affects the implant/restoration complex depending on the connection design. Zirconia abutments and monolithic restorations seem to be highly reliable in terms of mechanical resistance.
Highlights
Nowadays, osseointegrated implants are becoming the most common treatment alternative among clinicians in order to restore missing teeth as they have been proven to have high survival rates in the scientific literature
The aim of this study is to evaluate the mechanical behavior of chairside customized zirconia abutments with two different implant connections under static and fatigue conditions
The findings of this study suggest that the fracture resistance of the zirconia abutment with an internal conical connection was higher than that of the zirconia abutment with a tube in tube connection
Summary
Nowadays, osseointegrated implants are becoming the most common treatment alternative among clinicians in order to restore missing teeth as they have been proven to have high survival rates in the scientific literature. These implants were restored using titanium abutments and porcelain fused to metal crowns. CAD/CAM was created to give the clinician the possibility of designing and manufacturing a restoration without the need for laboratory assistance, provisional restorations, or conventional impressions [9]. The CAD/CAM blocks are manufactured in optimal conditions, creating a restoration with greater intrinsic resistance and reliability that can be found in laboratory-manufactured restorations with conventional materials [13,14]
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