Prospective assessment of CAD/CAM zirconia abutment and lithium disilicate crown restorations : 2.4 year results
Volume 116, Issue 1, July 2016, Pages 33–39
Abstract
Statement of problem
Single-tooth
implant restorations are commonly used to replace anterior maxillary
teeth. The esthetic, functional, and biologic outcomes are, in part, a
function of the abutment and crown.
Purpose
The
purpose of this clinical study was to describe the implant, abutment,
and crown survival and complication rates for CAD/CAM zirconia abutment
and lithium disilicate crown restorations for single-tooth implants.
Material and methods
As
part of a broader prospective investigation that enrolled and treated
141 participants comparing tissue responses at the conical interface
(CI; AstraTech OsseoSpeed), flat-to-flat interface (FI; NobelSpeedy),
and platform-switch interface (PS; NanoTite Certain Prevail) of
single-tooth implants, computer-aided design and computer-aided
manufacturing (CAD/CAM) zirconia abutments (ATLANTIS Abutment) and
cemented lithium disilicate (e.max) crowns were used in the restoration
of all implants. After 2.4 years in function (3 years after implant
placement), the implant, abutment, and crown of 110 participants were
evaluated. Technical and biologic complications were recorded.
Demographic results were tabulated as percentages with mean values and
standard deviations. Abutment survival was calculated with the
Kaplan-Meier method.
Results
After
2.4 years, no abutments or crowns had been lost. Abutment complications
(screw loosening, screw fracture, fracture) were absent for all 3
implant groups. Crown complications were limited to 2 crowns debonding
and 1 with excess cement (2.5%). Five biological complications (4.0%)
were recorded. The overall complication rate was 6.5%.
Conclusions
CAD/CAM
zirconia abutments restored with cemented lithium disilicate crowns
demonstrated high survival on 3 different implant-abutment interface
designs. No abutment or abutment screw fracture occurred. The technical
complications observed after 2.4 years were minor and reversible. The
use of CAD/CAM zirconia abutments with cemented lithium disilicate
crowns is associated with high technical and biologic success at 2.4
years.
- Sponsored by Dentsply Implants.
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