Marginal Vertical Fit along the Implant-Abutment Interface: A Microscope Qualitative Analysis

Mobilio, Nicola; Fasiol, Alberto; Franceschetti, Giulio; Catapano, Santo

doi:10.3390/dj4030031

Cited by 11 publications

(15 citation statements)

References 13 publications

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“…Since some degrees of error and deformity are inevitable in both techniques, attempts must be made to minimize distortion during different phases of impression making as well as during the transfer of the implant position to the final cast in order to fabricate stress-free implant-supported restorations. 21,22 Carr found no significant difference between the openand closed-tray impression techniques when making the impressions of 2 implants with 15° divergence. 17 Conrad et al evaluated 3 implants and reported a similar level of distortion and deformity for the 2 impression techniques.…”

Section: Discussionmentioning

confidence: 94%

Effect of dental implant angulation on the dimensional accuracy of master casts

Barjini¹,

Sayahpour²,

Jafari³

2021

Dent. Med. Probl.

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Background. Making accurate impressions of dental implants and transferring their three-dimensional (3D) position to master casts is critical for the passive fit of prosthetic frameworks.Objectives. This study aimed to assess the effect of dental implant angulation on the dimensional accuracy of master casts.Material and methods. An acrylic model with 2 external hexagonal implants was used in this in vitro experimental study. The impressions of the model were made in 42 positions, with different angulation of the 2 implants, ranging from +15° to −15°, by means of the open-tray and closed-tray impression techniques, using a polyvinyl siloxane impression material. The spatial coordinates of the implants were measured on the X, Y and Z axes. The dimensional accuracy of the impressions made at different positions (parallel, convergent and divergent) and different angulation of the implants were determined. The data was analyzed using the one-way analysis of variance (ANOVA), Student's t test and Tukey's test.Results. Casts with the lowest accuracy were obtained when the 2 implants were divergent by 25° (R = 1.1336). However, the position of the 2 implants had no significant effect on the dimensional accuracy of the master casts. The error rate was 0.4181 in the open-tray technique and 0.5095 in the closed-tray technique, with no significant difference between them (p > 0.05). The angulation of the 2 implants had a significant effect on the dimensional accuracy of the master casts (p = 0.0001). Conclusions.Considering the significant effect of implant angulation in the range from +15° to −15° relative to the longitudinal axis on the dimensional accuracy of master casts, further studies are required to reach a final conclusion in this respect.

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Section: Discussionmentioning

confidence: 94%

Effect of dental implant angulation on the dimensional accuracy of master casts

Barjini¹,

Sayahpour²,

Jafari³

2021

Dent. Med. Probl.

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“…The amount of these micro gaps and their clinical signi cance have been getting remarkable attention. (4,7,27,28) Accordingly, different proposed methods have been employed to measure those micro gaps including the use of direct visualization under optical microscope (29) , or traveling microscope (28) microtomography, (30) and the analyzing method under scanning electron microscopy (SEM), (31) for either sectioned or embedded specimens and the use of a silicone replica. Although these techniques are well recognized, nevertheless, it is impossible to be used in vivo and several authors agreed that these measurements could involve unavoidable human errors, along with the non-standardized evaluation areas.…”

Section: Discussionmentioning

confidence: 99%

“…These factors could be the alteration in the radius of the instruments during the milling procedure, the wear of the milling tools and the size of the milling drills. (42) Mobilio et al (29) reported that the tolerance set for fabrication of either screw retained abutments or crowns during CAD/CAM procedure could have a major role in their nal t to implant. The study claimed that reduction in tolerance values by 10-µm could increase the attrition and, subsequently, the vertical t between the components.…”

Section: Discussionmentioning

confidence: 99%

Accuracy of Fit for Cobalt-Chromium Bar Over Two Implants Fabricted with Different Manufacturing Techniques‑An in Vitro Study.

Nassar

Fateen

2023

Preprint

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Objective The purpose of the invitro research was to compare the fit of Cobalt Chromium customized bar fabricated with different manufacturing processes cast metal bar, milled bar and 3D printed bar using scanning electron microscope. Material and Methods Clear epoxy resin molds were prepared. In each mold two parallel implants with a 14 mm distance from each other were embedded. Thirty Co-Cr custom bars were constructed and were divided equally into three groups: Group (I) (Co-Cr conv), group (II) milled bar (Co-Cr milled), and group (III) printed bar (Co-Cr print). The marginal fit at implant-abutment interface was scanned using scanning electron microscope (SEM) Results There was a significant difference between the three studied groups regarding marginal misfit the between implant and fabricated bars with p-value < 0.001. The highest value of micro-gap distance was found in Co-Cr conventional group (7.95 ± 2.21µm) followed by Co-Cr 3D printed group (4.98 ± 1.73) and the lower value were found in Co-Cr milled (3.22 ± 0.75). Conclusion The marginal fit of milled, 3D printed and conventional cast for Co-Cr alloy were within the clinically acceptable range of misfit. CAD/CAM milled Co-Cr bar revealed a superior internal fit at the implant-abutment interface. This was followed by selective laser melting (SLM) 3D printed bar and the least fit was shown for customized bar with the conventional lost wax technique.

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“…Outro adendo concerne ao equipamento empregado na avaliação. Nesta pesquisa, preferiu-se operar o microscópio eletrônico de varredura (MEV), em detrimento do microscópio óptico (Mobilio et al, 2016;Rodrigues et al, 2017).…”

Section: Gruposunclassified

Avaliação de desajuste vertical de infraestruturas protéticas sobre implantes confeccionadas em liga de co-cr e ni-cr e soldagem tig

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Marginal Vertical Fit along the Implant-Abutment Interface: A Microscope Qualitative Analysis

Cited by 11 publications

References 13 publications

Effect of dental implant angulation on the dimensional accuracy of master casts

Effect of dental implant angulation on the dimensional accuracy of master casts

Accuracy of Fit for Cobalt-Chromium Bar Over Two Implants Fabricted with Different Manufacturing Techniques‑An in Vitro Study.

Avaliação de desajuste vertical de infraestruturas protéticas sobre implantes confeccionadas em liga de co-cr e ni-cr e soldagem tig

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