scholarly journals Marginal and Internal Precision of Zirconia Four-Unit Fixed Partial Denture Frameworks Produced Using Four Milling Systems

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2663
Author(s):  
Karl Martin Lehmann ◽  
Michael Weyhrauch ◽  
Monika Bjelepavlovic ◽  
Herbert Scheller ◽  
Henning Staedt ◽  
...  
Keyword(s):  
Marginal Gap ◽  
Partial Denture ◽  
System A ◽  
Fixed Partial Denture ◽  
Bonferroni Adjustment ◽  
Cad Cam ◽  
Level Of Significance ◽  
Internal Fit ◽  
Cam Systems ◽  
Marginal Region

Background: CAD/CAM systems enable the production of fixed partial dentures with small and reproducible internal and marginal gaps. Purpose: The purpose of this study was to evaluate the reproducibility of the marginal and internal adaptations of four-unit fixed partial denture frameworks produced using four CAD/CAM systems. Materials and Methods: Prepared dies of a master model that simulated the loss of the first left molar were measured. Fifteen frameworks were manufactured using four CAD/CAM systems (A–D). The internal fit was determined by the replica technique, and the marginal gap was determined by microscopy. ANOVA was carried out to detect significant differences, and the Bonferroni adjustment was performed. The global level of significance was set at 5%. Results: The mean gap size ranged from 84 to 132 µm (SD 43–71 µm). The CAD/CAM systems showed significant variance (p < 0.001), and system A (VHF) showed the smallest gaps. The smallest gaps for each system were in the molar part and in the marginal region of the frameworks (p < 0.001). Conclusions: The CAD/CAM systems showed significantly different gap sizes, particularly between premolars and molars and among the marginal, axial and occlusal regions. All of the systems are suitable for clinical application.

scholarly journals Marginal and Internal Fit of Ceramic Prostheses Fabricated from Different Chairside CAD/CAM Systems: An In Vitro Study

2021 ◽  
Vol 11 (2) ◽  
pp. 857
Author(s):  
Keunbada Son ◽  
Kyu-Bok Lee
Keyword(s):  
Computer Aided Design ◽  
In Vitro Study ◽  
Vitro Study ◽  
Marginal Gap ◽  
Significant Difference ◽  
Cad Cam ◽  
Ceramic Crowns ◽  
Internal Fit ◽  
Cam Systems

The purpose of this in vitro study was to evaluate marginal and internal fits of ceramic crowns fabricated with chairside computer-aided design and manufacturing (CAD/CAM) systems. An experimental model based on ISO 12836:2015 was digitally scanned with different intraoral scanners (Omnicam (CEREC), EZIS PO (DDS), and CS3500 (Carestream)). Ceramic crowns were fabricated using the CAD/CAM process recommended by each system (CEREC, EZIS, and Carestream systems; N = 15). The 3-dimensional (3D) marginal and internal fit of each ceramic crown was measured using a 3D inspection software (Geomagic control X). Differences among the systems and various measurements were evaluated using the Kruskal–Wallis test. Statistically significant differences were validated using pairwise comparisons (α = 0.05). Occlusal gaps in the CEREC, EZIS, and Carestream groups were 113.0, 161.3, and 438.2 µm, respectively (p < 0.001). The axial gaps were 83.4, 78.0, and 107.9 µm, respectively. The marginal gaps were 77.8, 99.3, and 60.6 µm, respectively, and the whole gaps were 85.9, 107.3, and 214.0 µm, respectively. Significant differences were observed with the EZIS system compared with the other two systems in terms of the marginal gap sizes. The CEREC system showed no significant differences among the four measured regions. However, the EZIS and Carestream systems did show a statistically significant difference (p < 0.05). All three systems were judged to be capable of fabricating clinically acceptable prostheses, because the marginal gap, which is the most important factor in the marginal fit of prostheses, was recorded to be below 100 µm in all three systems.

scholarly journals Vertical and Horizontal Misfit Analysis of 3-unit FDP Fabricated with Different Techniques and CAD/CAM Systems

2018 ◽  
Vol 29 (4) ◽  
pp. 342-346
Author(s):  
Eduardo Piza Pellizzer1 ◽  
Caroline Cantieri de Mello ◽  
Jéssica Marcela de Luna Gomes ◽  
Joel Ferreira Santiago Júnior ◽  
Cleidiel Aparecido Araújo Lemos ◽  
...  
Keyword(s):  
Reference Model ◽  
Optical Microscope ◽  
The Other ◽  
Marginal Adaptation ◽  
Nicr Alloy ◽  
Partial Denture ◽  
Optical Scanning ◽  
Fixed Partial Denture ◽  
Cad Cam ◽  
Cam Systems

Abstract The aim of this is was evaluate the vertical and horizontal marginal adaptation of 3-unit fixed partial denture frameworks fabricated using different techniques and CAD/CAM systems. A total of 40 framework specimens were fabricated and divided into four groups as follows: lost-wax casting (G1); lost-wax casting with welding (G2); extraoral optical scanning of models (3S/DWOS) (G3); intraoral optical scanning (Cerec Bluecam/Sirona) (G4). A reference model was used to simulate a fixed partial denture with three elements (with a central pontic). The frameworks of G1 and G2 were cast in nickel-chromium (NiCr) alloy, whereas those of G3 and G4 were milled in zirconia. In all groups, vertical and horizontal marginal adaptation (over-contour and under-contour) was evaluated using a three-dimensional optical microscope (Quick Scope, Mitutoyo). The results showed higher vertical marginal misfit in G1 than in the other groups (p<0.001). Regarding horizontal marginal misfit, higher over-contour values occurred in G3 than in the other groups (p<0.001). G3 did not show under-contour at all, whereas the other groups did not differ from each other in this regard (p>0.05). Within the limitations of this study, it can be concluded that lost-wax casting with welding is a viable alternative to the use of CAD/CAM systems to fabricate frameworks of three-unit FPDs, since the techniques yielded similar vertical misfit values. Extra-oral CAD/CAM systems showed the highest horizontal misfit (over-contour) compared to other groups.

scholarly journals Monolithic Zirconia FPD on Modified Titanium Bonding Bases in Limited Interocclusal Distance: A Case Report

2019 ◽  
pp. 0000-0000
Author(s):  
Enkhjargal Bayarsaikhan ◽  
Sangho Eom ◽  
Ui-Won Jung ◽  
Jae Hoon Lee
Keyword(s):  
Case Report ◽  
Male Patient ◽  
Missing Teeth ◽  
Partial Denture ◽  
Fixed Partial Denture ◽  
Cad Cam ◽  
Interocclusal Distance ◽  
Monolithic Zirconia ◽  
Zirconia Implant

A 62-year-old male patient sought treatment for missing maxillary teeth. A diagnostic cast demonstrated that the interocclusal distance was insufficient. A five-unit screw-retained implant-supported fixed partial denture (FPD) was used to restore missing maxillary teeth. The restoration of multiple missing teeth using an implant-supported FPD is challenging when the interocclusal distance is limited due to lack of retention and inadequate esthetics. In this case, a hexagonal, screw-retained, and sublingually located titanium-based zirconia implant-supported FPD with a conical abutment base was used for restoration to overcome the limited interocclusal distance. This implant-supported FPD, consisting of CAD/CAM-designed monolithic zirconia cemented to a titanium bonding base in the laboratory, is expected to facilitate predictable retention and adequate esthetics as well as provide ease of retrieval.

scholarly journals Effect of Luting Cement and Convergence Angle of the Preparation on the Internal Fit of Zirconia Restorations

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7858
Author(s):  
Andrés Sánchez-Monescillo ◽  
Carlos González-Serrano ◽  
José González-Serrano ◽  
João Malta Barbosa ◽  
Carlos López-Suárez ◽  
...  
Keyword(s):  
Glass Ionomer Cement ◽  
Resin Cement ◽  
Convergence Angle ◽  
System A ◽  
Luting Agents ◽  
Luting Cement ◽  
Cad Cam ◽  
And Coping ◽  
Internal Fit ◽  
Preparation Design

The objective was to evaluate the effect of luting agents and the preparation design on the internal fit of zirconia restorations. Sixty dies were prepared and divided in occlusal convergence angle of 6° (OC6) and 12° (OC12). CAD/CAM zirconia copings were fabricated (Lava All-Ceramic System). A zinc phosphate cement (ZPC); a glass ionomer cement (GIC); and a resin cement (RC) were studied. Specimens were sectioned and coping/die discrepancies were evaluated through Stereoscopic Microscopy. A closer fit was observed in OC12 when compared to OC6 (p < 0.001). For OC6 no significant differences were observed in between ZPC, GIC, and RC (p > 0.05). For OC12, a significantly closer fit was recorded on the ZPC subgroup when compared to the GIC subgroup (p < 0.001). Preparations of 12 degrees demonstrated a closer internal fit when compared to 6 degrees. Preparations of 12 degrees achieved better internal fit values with ZPC (Fortex) followed by RC (RelyX Unicem), and GIC (Ketac Cem). No differences were found when comparing different luting agents over 6° degrees preparations.

Comparison of marginal adaptation and internal fit of monolithic lithium disilicate crowns produced by 4 different CAD/CAM systems

2020 ◽  
Author(s):  
Brunna Mota Ferrairo ◽  
Fernanda Furtado Piras ◽  
Feranda Ferruzzi Lima ◽  
Heitor Marques Honório ◽  
Marco Antonio Hungaro Duarte ◽  
...  
Keyword(s):  
Lithium Disilicate ◽  
Marginal Adaptation ◽  
Cad Cam ◽  
Internal Fit ◽  
Cam Systems

Accuracy of CAD-CAM systems for removable partial denture framework fabrication: A systematic review

2020 ◽  
Author(s):  
Ana Larisse Carneiro Pereira ◽  
Annie Karoline Bezerra de Medeiros ◽  
Kaiza de Sousa Santos ◽  
Érika Oliveira de Almeida ◽  
Gustavo Augusto Seabra Barbosa ◽  
...  
Keyword(s):  
Systematic Review ◽  
Removable Partial Denture ◽  
Partial Denture ◽  
Cad Cam ◽  
Cam Systems

scholarly journals Marginal and Internal Fit of All-ceramic Crowns Fabricated with Two Different CAD/CAM Systems

2008 ◽  
Vol 27 (3) ◽  
pp. 422-426 ◽  
Author(s):  
Kyu-Bok LEE ◽  
Charn-Woon PARK ◽  
Kyo-Han KIM ◽  
Tae-Yub KWON
Keyword(s):  
All Ceramic ◽  
Cad Cam ◽  
Ceramic Crowns ◽  
Internal Fit ◽  
Cam Systems

scholarly journals A Prosthetic Alternative Treatment for Severe Anterior Ridge Defect using Fixed Removable Partial Denture Andrew's Bar System

2013 ◽  
Vol 4 (4) ◽  
pp. 282-285
Author(s):  
Ashish R Jain
Keyword(s):  
Alternative Treatment ◽  
Conventional Treatment ◽  
Class Iii ◽  
Removable Partial Denture ◽  
Partial Denture ◽  
System A ◽  
Fixed Partial Denture ◽  
Natural Teeth ◽  
Fixed Prosthesis

ABSTRACT It has been well documented that anterior ridge defects present in a patient are very difficult to treat properly. These defects have been treated with great amount of planning and complexities while using the conventional treatment approaches like removable or fixed prosthesis and options of implant. Though totally implant-supported restorations are very successful, dentists may resort to prescribe implant overdentures because of functional, anatomical economical or esthetic considerations. However, the loading conditions of the partially implant- supported overdenture may affect the long-term predictability of this type of restoration. The concept of the Andrew's bar system can be utilized. In some cases the Andrew's bar system is superior to the implant-supported fixed partial denture and other techniques for implant overdentures. The purpose of this article is to evaluate and describe the Andrew's bar system (a fixed removable partial denture), to treat a class III anterior ridge defect using natural teeth as abutments for its fixed component followed a removable component. The use of Andrew's bar system over implants offered the dentist another option in meeting patient's needs. How to cite this article Jain AR.A Prosthetic Alternative Treatment for Severe Anterior Ridge Defect using Fixed Removable Partial Denture Andrew's Bar System. World J Dent 2013;4(4):282-285.

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