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 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.

Connector Architecture for Computer-Assisted Design and Manufacturing Systems

2004 ◽  
Vol 20 (04) ◽  
pp. 262-268
Author(s):  
Reinhard M. Staebler ◽  
Bryan J. Miller ◽  
Paul J. Rakow ◽  
Thomas Koch
Keyword(s):  
Data Exchange ◽  
Manufacturing Systems ◽  
Reference Model ◽  
Computer Assisted ◽  
Computer Assisted Design ◽  
Cad Cam ◽  
Flexible Integration ◽  
Business Objects ◽  
Negative Impacts ◽  
Cam Systems

Flexible integration concepts for computer-assisted design (CAD) and manufacturing (CAM) systems have been identified as a key to let shipyards select and implement best-in-class software components for their CAD and CAM operations. Current implementations are dominated by bilateral links based on proprietary data exchange formats and are too complex to upgrade parts of a CAD/CAM infrastructure without negative impacts on the other parts. This paper describes the ongoing development of a connector architecture for CAD and CAM systems in shipbuilding. The architecture decouples CAD and CAM systems on the basis of a flexible integration technology, utilizing XML data exchange, lightweight directory access protocol (LDAP), and message-based communication. An enterprise reference model describing all relevant shipbuilding business objects forms the basis for the integration. So-called adapters connect the various CAD and CAM systems to the architecture. An automatic nesting solution is presented as a sample business solution in the connector architecture environment.

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 Assessment of Various Factors for Feasibility of Fixed Cantilever Bridge: A Review Study

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Ashu Sharma ◽  
G. R. Rahul ◽  
Soorya T. Poduval ◽  
Karunakar Shetty
Keyword(s):  
The Other ◽  
Class I ◽  
Clinical Failure ◽  
Documentary Evidence ◽  
Partial Denture ◽  
Substandard Care ◽  
Lever System ◽  
Fixed Partial Denture ◽  
Review Study ◽  
The Creation

Cantilever fixed partial dentures are defined as having one or more abutments at one end of the prosthesis while the other end is unsupported. Much controversy without documentary evidence has surrounded this prosthesis. Despite negative arguments, the cantilever prosthesis has been used extensively by the clinicians. If used nonjudiciously without following proper guidelines these might lead to some complications. Although complications may be an indication that clinical failure has occurred, this is not typically the case. It is also possible that complications may reflect substandard care. Apart from the substandard care, the unique arrangement of the abutments and pontic also accounts for the prime disadvantage: the creation of a class I lever system. When the cantilevered pontic is placed under occlusal function, forces are placed on the abutments. There are various criteria and factors necessary for a successful cantilever fixed partial denture (FPD). The purpose of this paper is to discuss briefly various factors involved in the planning of a cantilever fixed partial denture.

Marginal Adaptation and Quality of Interfaces in Lithium Disilicate Crowns — Influence of Manufacturing and Cementation Techniques

2017 ◽  
Vol 42 (2) ◽  
pp. 185-195 ◽  
Author(s):  
CA Melo Freire ◽  
GA Borges ◽  
DBM Caldas ◽  
RS Santos ◽  
SA Ignácio ◽  
...  
Keyword(s):  
Lithium Disilicate ◽  
Optical Microscope ◽  
Resin Cement ◽  
Marginal Adaptation ◽  
Interface Quality ◽  
Cement Line ◽  
Line Thickness ◽  
Cad Cam ◽  
Manufacturing Methods ◽  
Adhesive Application

SUMMARY Purpose: To evaluate the cement line thickness and the interface quality in milled or injected lithium disilicate ceramic restorations and their influence on marginal adaptation using different cement types and different adhesive cementation techniques. Methods and Materials: Sixty-four bovine teeth were prepared for full crown restoration (7.0±0.5 mm in height, 8.0 mm in cervical diameter, and 4.2 mm in incisal diameter) and were divided into two groups: CAD/CAM automation technology, IPS e.max CAD (CAD), and isostatic injection by heat technology, IPS e.max Press (PRESS). RelyX ARC (ARC) and RelyX U200 resin cements were used as luting agents in two activation methods: initial self-activation and light pre-activation for one second (tack-cure). Next, the specimens were stored in distilled water at 23°C ± 2°C for 72 hours. The cement line thickness was measured in micrometers, and the interface quality received scores according to the characteristics and sealing aspects. The evaluations were performed with an optical microscope, and scanning electron microscope images were presented to demonstrate the various features found in the cement line. For the cement line thickness, data were analyzed with three-way analysis of variance (ANOVA) and the Games-Howell test (α=0.05). For the variable interface quality, the data were analyzed with the Mann-Whitney U-test, the Kruskal-Wallis test, and multiple comparisons nonparametric Dunn test (α=0.05). Results: The ANOVA presented statistical differences among the ceramic restoration manufacturing methods as well as a significant interaction between the manufacturing methods and types of cement (p&lt;0.05). The U200 presented lower cement line thickness values when compared to the ARC with both cementation techniques (p&lt;0.05). With regard to the interface quality, the Mann-Whitney U-test and the Kruskal-Wallis test demonstrated statistical differences between the ceramic restoration manufacturing methods and cementation techniques. The PRESS ceramics obtained lower scores than did the CAD ceramics when using ARC cement (p&lt;0.05). Conclusions: Milled restorations cemented with self-adhesive resin cement resulted in a thinner cement line that is statistically different from that of CAD or pressed ceramics cemented with resin cement with adhesive application. No difference between one-second tack-cure and self-activation was noted.

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

Microstrains Around Standard and Mini Implants Supporting Different Bridge Designs

2012 ◽  
Vol 38 (3) ◽  
pp. 221-229 ◽  
Author(s):  
Hanaa Sallam ◽  
Lamia Sayed Kheiralla ◽  
Alzahra Aldawakly
Keyword(s):  
Strain Gauges ◽  
Vertical Load ◽  
Nicr Alloy ◽  
Standard Size ◽  
Partial Denture ◽  
Second Molar ◽  
Vertical Loading ◽  
Fixed Partial Denture ◽  
Mini Implants ◽  
Standard Implant

The purpose of the study was to analyze microstrains around small- versus standard-diameter implants used in restoration of thin wiry ridge through different bridge designs. Additionally, influence of the site of occlusal vertical loading was evaluated using strain gauges. Two models simulating mandibular unilateral free-end saddle were fabricated. Two standard-size implants (3.75 × 13 mm) were inserted in one model in the position of the second premolar and first molar to support 2 3-unit cantilever bridges (NiCr alloy). On the other model, a standard implant and a mini implant (3.0 × 13 mm) were inserted in the position of the second premolar and second molar, respectively, to support 2 fixed-fixed 3-unit NiCr bridges. Four strain gauges were mounted buccally, lingually, mesially, and distally adjacent to each implant. The prostheses were temporarily cemented. A 300 N vertical load was applied on the middle of the horizontal runner bar connecting the prosthetic units and on the center of the pontics. Microstrains were recorded and analyzed. Cantilever bridges recorded higher microstrains than fixed-fixed bridges for both loading conditions. Yet, for both designs, loading on the horizontal runner bars, which apply an equal load on all bridge units simultaneously, resulted in significantly lower microstrain values than applying the load only on the pontics. Mini implant revealed greater strain values than standard implant supporting the same fixed partial denture. The best treatment option that produced the least microstrains was the fixed-fixed bridge with a mini implant as a terminal abutment. Mini implants induced higher microstrains than standard implants.

scholarly journals The Internal and Marginal Adaptation of Zirconia Based Fixed Dental Prostheses in the Posterior Region

2021 ◽  
Author(s):  
Ayşe Koçak-Büyükdere ◽  
Atilla Sertgöz
Keyword(s):  
Cross Sections ◽  
Clinical Success ◽  
Optical Microscope ◽  
Marginal Adaptation ◽  
Dental Prostheses ◽  
Occlusal Surfaces ◽  
Cad Cam ◽  
Molar Teeth ◽  
Fixed Dental Prostheses ◽  
Internal Fit

Purpose:Long-term clinical success is closely related to the internal and marginal adaptation of the restorations. Thepurpose of this study was to evaluate the internal adaptation of zirconia-based fixed dental prostheses in the posteriorregion.Materials & Methods:Four-unit porcelain-fused to zirconia fixed dental prostheses were fabricated with CAD-CAMsystem in 20 patients. For the evaluation of the restorations’ internal fit, conventional silicone replicas were used withthe optical microscope. The obtained silicone impression was cut to obtain two cross-sections from buccolingual and 3from mesiodistal. Fifty different measurements were taken from every tooth by taking 10 from each cross- section; 2from the margin, 6 from the axial surfaces and 2 from the occlusal by the optical microscope.Results:There were statistically significant differences in internal discrepancy in terms of area and tooth type. Theaverage internal discrepancy on the axial surfaces of the molars was 142.39±47.42μm. In premolars, the mean was139.53±46.80μm. The average of the internal discrepancy values obtained from occlusal surfaces of the molar teeth was164.39±53.61μm, whereas the same average for the premolar teeth was 161.92±60.54μm.Conclusion:Within the limitations of this study, restorations fabricated by CAD/CAM and internal and marginaldiscrepancies were at clinically acceptable intervals

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