Evaluation of Marginal and Internal Fit of Presintered Co‐Cr and Zirconia Three‐Unit Fixed Dental Prosthesis Compared to Cast Co‐Cr

2020 ◽  
Vol 29 (9) ◽  
pp. 792-799
Author(s):  
Elie E. Daou ◽  
Nadim Z. Baba
Keyword(s):  
Dental Prosthesis ◽  
Fixed Dental Prosthesis ◽  
Internal Fit

scholarly journals A Comparative Study of the Fitness and Trueness of a Three-Unit Fixed Dental Prosthesis Fabricated Using Two Digital Workflows

2019 ◽  
Vol 9 (14) ◽  
pp. 2778 ◽  
Author(s):  
Daehee Jang ◽  
Keunbada Son ◽  
Kyu-bok Lee
Keyword(s):  
Pearson Correlation ◽  
Dental Prosthesis ◽  
Test Model ◽  
3D Analysis ◽  
Digital Workflow ◽  
Open Type ◽  
Fixed Dental Prosthesis ◽  
Closed Type ◽  
Computer Aided ◽  
Internal Fit

The purpose of this study was to measure and correlate the fitness and trueness of a 3-unit fixed dental prosthesis (FDP) fabricated using two digital workflows. The 3-unit FDPs were fabricated using two digital workflows (N = 15). The digital workflows were divided into chairside (closed type) and in-lab (open type) groups. The scanning, computer-aided design (CAD), and computer-aided manufacturing (CAM) processes were conducted with 3shape E1 scanner, exocad CAD software, and DDS EZIS HM, respectively, in the in-lab group; and with CEREC omnicam intraoral scanner, CEREC CAD software, and CEREC MC XL, respectively, in the chairside group. The fitness of the fabricated 3-unit FDPs was evaluated by scanning the silicone replica of the cement space and analyzing the thickness of the silicone replica in the three-dimensional (3D) inspection software (Geomagic control X). The trueness of the milling unit was analyzed by 3D analysis of the CAD reference model, which is the design file of the 3-unit FDP, and the CAD test model, which is the scanned file of the 3-unit FDP. In the statistical analysis, comparison of the two groups was conducted by Mann–Whitney U test, and the correlation between the fitness and trueness was conducted by Pearson correlation test (α = 0.05). The marginal and internal fit were significantly lower in the in-lab group at all measurement positions (p < 0.001). The trueness of the milling unit was significantly higher in the in-lab group compared to the chairside group (p < 0.001). There was a positive correlation between the trueness and internal fit (correlation coefficient = 0.621) in the in-lab group (p = 0.013). The use of appropriate equipment in an in-lab (open type) digital workflow enables a better fabrication of 3-unit FDPs than a chairside (closed type) digital workflow, and poor trueness on the inner surface of the crown adversely affects the internal fit.

Comparison between two materials for the fabrication of modified design for posterior inlay-retained fixed dental prosthesis: A finite element study

2018 ◽  
Vol 10 (2) ◽  
pp. 88
Author(s):  
RamiM Galal ◽  
SalahA Yossef ◽  
WaleedM. S. Alqahtani ◽  
AbdullahA Alluqmani ◽  
MohammadA Abdulsamad ◽  
...  
Keyword(s):  
Finite Element ◽  
Dental Prosthesis ◽  
Finite Element Study ◽  
Fixed Dental Prosthesis ◽  
Element Study

scholarly journals The total occlusal convergence of the abutment of a partial fixed dental prosthesis: A definition and a clinical technique for its assessment

2013 ◽  
Vol 07 (04) ◽  
pp. 509-513 ◽  
Author(s):  
John S. Mamoun
Keyword(s):  
Dental Prosthesis ◽  
Experimental Results ◽  
High Magnification ◽  
Operating Microscope ◽  
Alternative Definition ◽  
Fixed Dental Prosthesis ◽  
Definition Of ◽  
The Ideal

ABSTRACTThe abutment(s) of a partial fixed dental prosthesis (PFDP) should have a minimal total occlusal convergence (TOC), also called a taper, in order to ensure adequate retention of a PFDP that will be made for the abutment(s), given the height of the abutment(s). This article reviews the concept of PFDP abutment TOC and presents an alternative definition of what TOC is, defining it as the extent to which the shape of an abutment differs from an ideal cylinder shape of an abutment. This article also reviews experimental results concerning what is the ideal TOC in degrees and explores clinical techniques of estimating the TOC of a crown abutment. The author suggests that Dentists use high magnification loupes (×6-8 magnification or greater) or a surgical operating microscope when preparing crown abutments, to facilitate creating a minimum abutment TOC.

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