Influence of the casting technique and dynamic loading on screw detorque and misfit of single unit implant-supported prostheses

Bhering, Cláudia Lopes Brilhante; Takahashi, Jessica Mie Ferreira Koyama; Luthi, Leonardo Flores; Henriques, Guilherme Elias Pessanha; Mesquita, Marcelo Ferraz

doi:10.3109/00016357.2012.690528

Cited by 19 publications

(18 citation statements)

References 28 publications

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“…However, the lost-wax casting (unlike the digital technique) allows for manual control of any over-contour of the framework. In addition, another possibility is related to different framework material, since the metal alloy contraction after the casting could reduce the overextension of the framework (19).…”

Section: Discussionmentioning

confidence: 99%

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

et al. 2018

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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.

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Section: Discussionmentioning

confidence: 99%

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

et al. 2018

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“…Use of nickel‐chromium alloys has been discouraged due to the possibility of allergic reaction and the carcinogenic potential of nickel . Regarding the framework fabrication method, the overcastable components used for the present patient have shown to lead to a more passive framework than the entirely calcinable ones . However, the most passive frameworks can be obtained from computer aided design/computer aided manufacturing (CAD/CAM) systems, which allow the fabrication of metallic and ceramic milled frameworks .…”

Section: Discussionmentioning

confidence: 99%

“…21 Regarding the framework fabrication method, the overcastable components used for the present patient have shown to lead to a more passive framework than the entirely calcinable ones. 22 However, the most passive frameworks can be obtained from computer aided design/computer aided manufacturing (CAD/CAM) systems, which allow the fabrication of metallic and ceramic milled frameworks. 23 Despite these considerations, a CAD/CAM system was not used in this clinical report because they are still expensive for framework fabrication.…”

Section: Discussionmentioning

confidence: 99%

Prosthetic Improvement of Pronounced Buccally Positioned Zygomatic Implants: A Clinical Report

Bacchi

Santos

Pimentel

et al. 2014

Journal of Prosthodontics

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This report presents a prosthetic technique for the improvement of surgically positioned, buccally placed zygomatic implants with the use of custom abutments for improved retention screw position and an esthetic implant reconstruction. The patient presented four zygomatic implants with pronounced buccal inclination. The anterior implants were inclined toward the location where the anterior artificial teeth should be placed during rehabilitation. As the manufacturer does not provide angulated abutments, we attempted the waxing and overcasting of a prosthetic abutment, repositioning the access holes of the prosthetic screws to a more palatal position. This clinical report demonstrates that abutment customization could be an interesting way to relocate the access holes of the prosthetic screws in cases of zygomatic implants with pronounced buccal inclination.

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“…1 ). 10 All procedures in the study were performed by the same operator. Data for each group were recorded and statistical analyze was carried out by two-way ANOVA (screw type vs tightening technique) and multiple comparison evaluated by Tukey's test with 5% significance level.…”

Section: Methodsmentioning

confidence: 99%

Loosening torque of Universal Abutment screws after cyclic loading: influence of tightening technique and screw coating

et al. 2015

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PURPOSEThe purpose of this study was to evaluate the influence of tightening technique and the screw coating on the loosening torque of screws used for Universal Abutment fixation after cyclic loading.MATERIALS AND METHODSForty implants (Titamax Ti Cortical, HE, Neodent) (n=10) were submerged in acrylic resin and four tightening techniques for Universal Abutment fixation were evaluated: A - torque with 32 Ncm (control); B - torque with 32 Ncm holding the torque meter for 20 seconds; C - torque with 32 Ncm and retorque after 10 minutes; D - torque (32 Ncm) holding the torque meter for 20 seconds and retorque after 10 minutes as initially. Samples were divided into subgroups according to the screw used: conventional titanium screw or diamond like carbon-coated (DLC) screw. Metallic crowns were fabricated for each abutment. Samples were submitted to cyclic loading at 106 cycles and 130 N of force. Data were analyzed by two-way ANOVA and Tukey's test (5%).RESULTSThe tightening technique did not show significant influence on the loosening torque of screws (P=.509). Conventional titanium screws showed significant higher loosening torque values than DLC (P=.000).CONCLUSIONThe use of conventional titanium screw is more important than the tightening techniques employed in this study to provide long-term stability to Universal Abutment screws.

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Influence of the casting technique and dynamic loading on screw detorque and misfit of single unit implant-supported prostheses

Cited by 19 publications

References 28 publications

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

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

Prosthetic Improvement of Pronounced Buccally Positioned Zygomatic Implants: A Clinical Report

Loosening torque of Universal Abutment screws after cyclic loading: influence of tightening technique and screw coating

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