Systematic review and meta-analysis of welding procedures in one-piece cast implant-supported frameworks

Gomes, Jéssica Marcela de Luna; Moraes, Sandra Lúcia Dantas de; Lemos, Caa; Cruz, Raimundo Leite; Oliveira, Hiskell Francine Fernandes e; Pellizzer, Eduardo Piza

doi:10.1590/1807-3107bor-2019.vol33.0110

Cited by 3 publications

(1 citation statement)

References 31 publications

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“…Furthermore, this technique yields a framework with reasonable hardness and minimizes the heat-affected zone, which is crucial for maintaining the integrity of the material. 32 De Castro et al evaluated stress distribution in Co-Cr frameworks with the use of laser welding and TIG welding, and concluded that the stress generated around the implants was similar for both techniques. 25 In the present study, although laser welding presented high stress between the implants, TIG welding showed the highest shear stress values in the crestal bone region at 3 key points, as well as in the apical region of the implants for both the EH and MT connections.…”

Section: Discussionmentioning

confidence: 99%

Influence of the frameworks of implant-supported prostheses and implant connections on stress distribution

Tonin,

Peixoto,

et al. 2023

Dent. Med. Probl.

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Background. The maintenance of marginal bone integrity around dental implants continues to be a clinical challenge. It is still unclear whether loading multiple implant-supported prostheses that have different implant connections influences bone resorption.Objectives. The aim of this in vitro study was to compare stress distribution around residual edentulous ridges supported by external hexagon (EH) and Morse taper (MT) implants with screw-retained frameworks obtained with the use of different methods.Material and methods. Three-element implant-supported prostheses with distal cantilevers were manufactured according to different techniques of obtaining the framework: LAS -framework sectioned and welded with a laser; TIG -framework sectioned and welded with tungsten inert gas (TIG); and CCS -framework obtained using a computer-aided design/computer-aided manufacturing (CAD/CAM) system. Occlusal and punctual loading (150 N) was applied to the cantilevers. In the photoelastic stress analysis, the fringe orders (n) were quanitified using the Tardy method, which calculates the maximum shear stress value (τ) at each selected point.Results. High stress around the implants and tightening were observed in the TIG group, mainly in the crestal bone region for the EH and MT implant connections. The LAS and CCS frameworks exhibited lower stress for the MT connection under occlusal and punctual loading.Conclusions. The comparative analysis of the models showed that the MT connection type associated with the laser-welded or CAD/CAM frameworks resulted in lower stress values in the crestal bone area, suggesting the preservation of bone tissue in this region.

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Section: Discussionmentioning

confidence: 99%

Influence of the frameworks of implant-supported prostheses and implant connections on stress distribution

Tonin,

Peixoto,

et al. 2023

Dent. Med. Probl.

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Evaluation of Marginal Fit and Flexural Strength of Screw-retained Casted One-piece Metal Framework Postsectioning and Welding: An In Vitro Study

Malhotra¹,

Sangwan²,

Bhargava³

et al. 2023

World Journal of Dentistry

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Estudio in vitro del ajuste de supraestructuras pasivadas sobre implantes múltiples /In vitro study of the adjustment of passivated suprastructures on multiple implants

Boero López,

Albera

2023

Rev Asoc Odontol Argent

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Objetivo: Comparar dos procedimientos de soldadura convencionales empleando una aleación de Cr-Co, para conectar barras coladas seccionadas a ser fijadas sobre implantes. Materiales y métodos: A partir de un modelo maestro que representa un maxilar desdentado con cuatro implantes, se confeccionaron veinte (n=20) probetas seccionadas en tres partes. Se conformaron dos grupos, cada uno con diez (n=10) ejemplares. Una vez acondicionadas, fueron atornilladas al modelo maestro. Su desajuste inicial se analizó utilizando una lupa estereoscópica, con una cámara incorporada y un software. Las partes fueron soldadas empleando un procedimiento diferente para cada grupo. Las correspondientes al Grupo I se invistieron en un block refractario a base de sílico-fosfato. Las del Grupo II se montaron en una estructura metálica Clever Spider. El desajuste fue mensurado y los resultados procesados estadísticamente. El nivel de significación fue establecido en p<0,05. Resultados: El Grupo I tuvo un desajuste inicial de 97,30±13,81μm y el Grupo II de 98,53±11,24μm. Luego de la soldadura, el Grupo I registró 98,53±17,17μm, 1,23μm mayor respecto al inicial. En el Grupo II se observó 103,13±17,61μm, 4,60μm por encima del original. Se analizaron mediante prueba t de Student; en ambos casos el resultado fue de p>0,05. Al comparar entre sí los grupos I y II, por medio de la prueba t y de comprobación no paramétrica de Mann-Whitney, se observaron diferencias no significativas, p=0,41 y p=0,38 respectivamente. Conclusiones: Bajo las condiciones de este estudio, se observó que los dos métodos de soldadura analizados fueron confiables para unir supraestructurasos metálicas sin que se afecte su ajuste final. Palabras clave: Ajuste pasivo, discrepancia marginal, implantes dentales, sobredentadura, soldadura. /Aim: Compare two conventional welding procedures using a Cr-Co alloy, to connect sectioned cast bars to be fixed on implants. Materials and methods: From a master model representing a toothless jaw with four implants, twenty (n=20) specimens sectioned into three parts were made. Two groups were formed, each with ten (n=10) specimens. Once conditioned, they were screwed to the master model. Its initial mismatch was analyzed using a stereoscopic magnifier, with a built-in camera and a software. The parts were welded using a different procedure for each group. Those corresponding to Group I were invested in a refractory block based on silyl-phosphate. Those of Group II were mounted on a Clever Spider metal structure. The mismatch was measured, and the results processed statistically. The level of significance was established at p<0.05. Results: Group I had an initial mismatch of 97.30 ±13.81μm, and Group II of 98.53±11.24μm. After welding, Group I registered 98.53±17.17μm, 1.23μm higher than the initial one. In Group II, 103.13±17.61μm was observed, 4.60μm above the original. They were analyzed using Student’s t test; in both cases the result was p>0.05. When comparing groups I and II, using the t-test and the Mann-Whitney nonparametric verification, non-significant differences were observed, p=0.41 and p=0.38 respectively. Conclusions: Under the conditions of this study, it was observed that the two welding methods analyzed were reliable for joining metallic superstructures without affecting their final fit. Keywords: Dental implants, marginal discrepancy, overdenture, passive fit, welding.

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Systematic review and meta-analysis of welding procedures in one-piece cast implant-supported frameworks

Cited by 3 publications

References 31 publications

Influence of the frameworks of implant-supported prostheses and implant connections on stress distribution

Influence of the frameworks of implant-supported prostheses and implant connections on stress distribution

Evaluation of Marginal Fit and Flexural Strength of Screw-retained Casted One-piece Metal Framework Postsectioning and Welding: An In Vitro Study

Estudio in vitro del ajuste de supraestructuras pasivadas sobre implantes múltiples /In vitro study of the adjustment of passivated suprastructures on multiple implants

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