Precision of Fit to Implants: A Comparison of Cresco™ and Procera® Implant Bridge Frameworks

ABSTRACT Background: The Cresco™ (Astra Tech AB, Mölndal, Sweden) method aims to reduce the inevitable distortions when cast metal frameworks for implant‐supported prostheses are fabricated. However, limited data are available for the precision of fit for this method. Purpose: To measure and compare...

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Bibliographic Details
Published in:Clinical implant dentistry and related research 2010-12, Vol.12 (4), p.271-280
Main Authors: Hjalmarsson, Lars, Örtorp, Anders, Smedberg, Jan-Ivan, Jemt, Torsten
Format: Article
Language:English
Subjects:
Chromium Alloys
CNC-milled
Cobalt
Complete
complications
Computer-Aided Design
Dental Casting Technique
Dental Implants
Dental Models
Dental Prosthesis
Dental Prosthesis Design
Dental Prosthesis Retention
Dental Prosthesis Retention - instrumentation
Dental Prosthesis, Implant-Supported
Dentistry
Denture
Denture, Complete
distortion
frameworks
Humans
Implant-Supported
instrumentation
laser-welded
Least-Squares Analysis
methods
misfit
Nonparametric
Odontologi
screw-retention
Statistics
Statistics, Nonparametric
Titanium
Welding
Welding - methods
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Summary:ABSTRACT Background: The Cresco™ (Astra Tech AB, Mölndal, Sweden) method aims to reduce the inevitable distortions when cast metal frameworks for implant‐supported prostheses are fabricated. However, limited data are available for the precision of fit for this method. Purpose: To measure and compare the precision of fit of Cresco‐ and computer numeric controlled (CNC)‐milled metal frameworks for implant‐supported fixed complete prostheses. Materials and Methods: Two groups of frameworks were fabricated according to the Cresco method, either in titanium (Cresco‐Ti, n = 10) or in a cobalt‐chrome alloy (Cresco‐CoCr, n = 10). A third group comprised CNC‐milled titanium frameworks (Procera® Implant Bridge [PIB], Nobel Biocare AB, Göteborg, Sweden), made from individual model/pattern measurements (PIB, n = 5). Measurements of fit were performed by means of a coordinate measuring machine linked to a computer. The collected data on distortions were analyzed. Results: Overall, a maximal three‐dimensional range of center point distortion of 279 µm was observed for measured frameworks. The framework width (x‐axis) decreased for Cresco‐CoCr, but increased in Cresco‐Ti and PIB; Cresco‐CoCr compared to Cresco‐Ti (p = .0002) and Cresco‐CoCr compared to PIB (p 
ISSN:1523-0899
1708-8208
1708-8208
DOI:10.1111/j.1708-8208.2009.00171.x