scholarly journals In Vitro Simulation of Dental Implant Bridges Removal: Influence of Luting Agent and Abutments Geometry on Retrievability

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2797
Author(s):  
Andrea T. Lugas ◽  
Mara Terzini ◽  
Elisabetta M. Zanetti ◽  
Gianmario Schierano ◽  
Carlo Manzella ◽  
...  
Keyword(s):  
Clear Correlation ◽  
Dental Prostheses ◽  
Implant Complications ◽  
Luting Agent ◽  
Dental Practitioners ◽  
Impulsive Forces ◽  
Fixed Dental Prostheses ◽  
Clinical Conditions ◽  
Bridge Models

Implant fixed dental prostheses are widely used for the treatment of edentulism, often preferred over the screw-retained ones. However, one of the main features of an implant-supported prosthesis is retrievability, which could be necessary in the case of implant complications. In this study, the retrievability of implant-fixed dental prostheses was investigated considering two of the main factors dental practitioners have to deal with: the abutments geometry and the luting agent. Impulsive forces were applied to dental bridge models to simulate crowns’ retrievability in clinical conditions. The number of impulses and the impulsive force delivered during each test were recorded and used as retrievability indexes. One-hundred-and-five tests were conducted on 21 combinations of bridges and luting agents, and a Kruskal-Wallis test was performed on the results. The abutment geometry significantly influenced the number of impulses needed for retrieval (p < 0.05), and a cement-dependent trend was observed as well. On the other hand, the forces measured during tests showed no clear correlation with bridge retrievability. The best retrievability was obtained with long, slightly tapered abutments and a temporary luting agent.

scholarly journals Fracture Resistance of CAD/CAM Versus Traditional Interim Fixed Dental Prostheses

2018 ◽  
Vol 55 (3) ◽  
pp. 361-363
Author(s):  
Daniel Alexandru Pop ◽  
R. Malaescu ◽  
Liviu Marsavina ◽  
Tiberiu Hosszu ◽  
Raul Rotar ◽  
...  
Keyword(s):  
Testing Machine ◽  
In Vitro Study ◽  
Maximum Load ◽  
Fracture Load ◽  
Digital Design ◽  
Computer Assisted ◽  
Dental Prostheses ◽  
Cad Cam ◽  
Fixed Dental Prostheses

The aim of this in vitro study is to compare the load-to-fracture performance of polymethyl methacrylates (PMMA) provisional restorations manufactured with a traditional laboratory technique in comparison to a computer-assisted design and computer-assisted manufacturing (CAD-CAM) technique. Five interim three-unit fixed dental prostheses were fabricated with the conventional indirect technique, on a standard typodont. The same model was scanned with an intraoral scanner and the digital design of identical fixed dental prostheses was made. Then other five interim three-unit fixed dental prostheses were milled from PMMA CAD/CAM blocks with an in office milling machine. All specimens were tested for flexural strength in a universal testing machine, and the maximum load to fracture was measured. For the conventional provisional restorations, the load to fracture was 121.16 � 24.6, in comparison to CAD/CAM interim restorations, for which the load to fracture was 728.88 � 228.7. Within the limitations of this study, one can conclude that CAD/CAM provisional restorations present a higher fracture load than the conventional manufactured interim restorations.

In vitro comparison of trueness of 10 intraoral scanners for implant-supported complete-arch fixed dental prostheses

2020 ◽  
Vol 124 (6) ◽  
pp. 755-760 ◽  
Author(s):  
Caglar Bilmenoglu ◽  
Altug Cilingir ◽  
Onur Geckili ◽  
Hakan Bilhan ◽  
Tayfun Bilgin
Keyword(s):  
Dental Prostheses ◽  
Fixed Dental Prostheses ◽  
In Vitro Comparison

scholarly journals Does Printing Orientation Matter? In-Vitro Fracture Strength of Temporary Fixed Dental Prostheses after a 1-Year Simulation in the Artificial Mouth

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 259
Author(s):  
Julian Nold ◽  
Christian Wesemann ◽  
Laura Rieg ◽  
Lara Binder ◽  
Siegbert Witkowski ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Fracture Strength ◽  
Computer Aided Design ◽  
In Vitro Study ◽  
Bending Test ◽  
Dental Prostheses ◽  
Computer Aided ◽  
Subtractive Manufacturing ◽  
Fixed Dental Prostheses

Computer-aided design and computer-aided manufacturing (CAD–CAM) enable subtractive or additive fabrication of temporary fixed dental prostheses (FDPs). The present in-vitro study aimed to compare the fracture resistance of both milled and additive manufactured three-unit FDPs and bar-shaped, ISO-conform specimens. Polymethylmethacrylate was used for subtractive manufacturing and a light-curing resin for additive manufacturing. Three (bars) and four (FDPs) different printing orientations were evaluated. All bars (n = 32) were subjected to a three-point bending test after 24 h of water storage. Half of the 80 FDPs were dynamically loaded (250,000 cycles, 98 N) with simultaneous hydrothermal cycling. Non-aged (n = 40) and surviving FDPs (n = 11) were subjected to static loading until fracture. Regarding the bar-shaped specimens, the milled group showed the highest flexural strength (114 ± 10 MPa, p = 0.001), followed by the vertically printed group (97 ± 10 MPa, p < 0.007). Subtractive manufactured FDPs revealed the highest fracture strength (1060 ± 89 N) with all specimens surviving dynamic loading. During artificial aging, 29 of 32 printed specimens failed. The present findings indicate that both printing orientation and aging affect the strength of additive manufactured specimens. The used resin and settings cannot be recommended for additive manufacturing of long-term temporary three-unit FDPs.

In vitro precision of fit of computer-aided designed and computer-aided manufactured titanium screw-retained fixed dental prostheses before and after ceramic veneering

2013 ◽  
Vol 26 (1) ◽  
pp. 44-49 ◽  
Author(s):  
Joannis Katsoulis ◽  
Regina Mericske-Stern ◽  
Norbert Enkling ◽  
Konstantinos Katsoulis ◽  
Markus B. Blatz
Keyword(s):  
Titanium Screw ◽  
Dental Prostheses ◽  
Computer Aided ◽  
Before And After ◽  
Fixed Dental Prostheses

Evaluation of Two Protocols to Measure the Accuracy of Fixed Dental Prostheses: An In Vitro Study

2017 ◽  
Vol 28 (2) ◽  
pp. e599-e603 ◽  
Author(s):  
Joana Schönberger ◽  
Kurt-Jürgen Erdelt ◽  
Daniel Bäumer ◽  
Florian Beuer
Keyword(s):  
In Vitro Study ◽  
Vitro Study ◽  
Dental Prostheses ◽  
Fixed Dental Prostheses

scholarly journals CAD/CAM Resin-Based Composites for Use in Long-Term Temporary Fixed Dental Prostheses

Polymers ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 3469
Author(s):  
Franziska Hensel ◽  
Andreas Koenig ◽  
Hans-Martin Doerfler ◽  
Florian Fuchs ◽  
Martin Rosentritt ◽  
...  
Keyword(s):  
In Vitro Study ◽  
Chewing Simulation ◽  
Long Term Stability ◽  
Dental Prostheses ◽  
Alternative Materials ◽  
Cad Cam ◽  
Fixed Dental Prostheses ◽  
Additional Image

The aim of this in vitro study was to analyse the performance of CAD/CAM resin-based composites for the fabrication of long-term temporary fixed dental prostheses (FDP) and to compare it to other commercially available alternative materials regarding its long-term stability. Four CAD/CAM materials [Structur CAD (SC), VITA CAD-Temp (CT), Grandio disc (GD), and Lava Esthetic (LE)] and two direct RBCs [(Structur 3 (S3) and LuxaCrown (LC)] were used to fabricate three-unit FDPs. 10/20 FDPs were subjected to thermal cycling and mechanical loading by chewing simulation and 10/20 FDPs were stored in distilled water. Two FDPs of each material were forwarded to additional image diagnostics prior and after chewing simulation. Fracture loads were measured and data were statistically analysed. SC is suitable for use as a long-term temporary (two years) three-unit FDP. In comparison to CT, SC featured significantly higher breaking forces (SC > 800 N; CT < 600 N) and the surface wear of the antagonists was (significantly) lower and the abrasion of the FDP was similar. The high breaking forces (1100–1327 N) of GD and the small difference compared to LE regarding flexural strength showed that the material might be used for the fabrication of three-unit FDPs. With the exception of S3, all analysed direct or indirect materials are suitable for the fabrication of temporary FDPs.

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