Evaluation of cement-retained versus screw-retained implant-supported restorations for marginal bone loss

Lemos, Caa; Batista, Victor Eduardo de Souza; Almeida, Daniel Augusto de Faria; Júnior, Joel Ferreira Santiago; Verri, Fellippo Ramos; Pellizzer, Eduardo Piza

doi:10.1016/j.prosdent.2015.08.026

Cited by 140 publications

(142 citation statements)

References 44 publications

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“…For example, it has been proposed that the screw access hole helps to transfer stress off the long axis of the implant, and that different restorative materials can transfer occlusal loads laterally to the implant instead of axially (7). The cement also may be better at filling discrepancies, absorbing and equalizing the stress of deformations caused by contact between the abutment and implant in the prosthesis structure (16).…”

Section: Discussionmentioning

confidence: 99%

“…These factors can contribute to fixation screw of screwed prosthesis present stress overload in the structure, which contributes to greater complication rates can explain the frequent failures (e.g. screw loosening or fracture) that are observed in screwed prostheses (7,15,17). The high risk in the screw-retained prosthesis can be related to lower preload in the screw with displacement (penetration and gaps) higher and concentrated on the threads of the screw/or abutment when compared to cement-retained (15).…”

Section: Discussionmentioning

confidence: 99%

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Retention System and Splinting on Morse Taper Implants in the Posterior Maxilla by 3D Finite Element Analysis

et al. 2018

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The purpose of this study was to evaluate different retention systems (cement-or screw-retained) and crown designs (non-splinted or splinted) of fixed implant-supported restorations, in terms of stress distributions in implants/components and bone tissue, by 3-dimensional (3D) finite element analysis. Four 3D models were simulated with the InVesalius, Rhinoceros 3D, and SolidWorks programs. Models were made of type III bone from the posterior maxillary area. Models included three 4.0-mm-diameter Morse taper (MT) implants with different lengths, which supported metal-ceramic crowns. Models were processed by the Femap and NeiNastran programs, using an axial force of 400 N and oblique force of 200 N. Results were visualized as the von Mises stress and maximum principal stress (σ max ). Under axial loading, there was no difference in the distribution of stress in implants/components between retention systems and splinted crowns; however, in oblique loading, cemented prostheses showed better stress distribution than screwed prostheses, whereas splinted crowns tended to reduce stress in the implant of the first molar. In the bone tissue cemented prostheses showed better stress distribution in bone tissue than screwed prostheses under axial and oblique loading. The splinted design only had an effect in the screwed prosthesis, with no influence in the cemented prosthesis. Cemented prostheses on MT implants showed more favorable stress distributions in implants/components and bone tissue. Splinting was favorable for stress distribution only for screwed prostheses under oblique loading.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Retention System and Splinting on Morse Taper Implants in the Posterior Maxilla by 3D Finite Element Analysis

et al. 2018

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“…Furthermore, cemented crowns were simulated in this study because they exhibit better biomechanical behavior with Morse taper implants [16] and contribute to greater preservation of the bone tissue, compared with the screwed crown [22]. …”

Section: Discussionmentioning

confidence: 99%

Splinted and Nonsplinted Crowns with Different Implant Lengths in the Posterior Maxilla by Three-Dimensional Finite Element Analysis

Lemos

Verri

Santiago

et al. 2018

Journal of Healthcare Engineering

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The aim of this study was to evaluate stress distribution in the implants/components and bone tissue for splinted and nonsplinted prostheses with different lengths of implants using three-dimensional finite element analysis. Six models from the posterior maxillary area were used in simulations. Each model simulated three Morse taper implants of 4.0 mm diameter with different lengths, which supported metal-ceramic crowns. An axial load of 400 N and an oblique load of 200 N were used as loading conditions. Splinted prostheses exhibited better stress distribution for the implants/components, whereas nonsplinted prostheses exhibited higher stress in the first molar under axial/oblique loading. Implant length did not influence stress distribution in the implants/components. In cortical bone tissue, splinted prostheses decreased the tensile stress in the first molar, whereas nonsplinted prostheses were subjected to higher tensile stress in the first molar; implant length had no influence on stress distribution. Within the limitations of this study, we conclude that splinted prostheses contributed to better stress distribution in the implant/abutment and cortical bone tissue; however, the reduction in the implant length did not influence the stress distribution.

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“…In the static load test, vertical load testing showed that both the chamfer and shoulder models had damage at the zirconia margin, while no marginal damage was seen in any group with the slanting load test at an angle of 30°1 7,19,23) . However, the slanting load caused separation at the border between the zirconia sleeve and the titanium base in the samples with the shoulder margin.…”

Section: Discussionmentioning

confidence: 89%

“…The aim of implant treatment is now not only to restore masticatory function, but also to recover esthetics 5,6) . As patient demand for better tooth esthetics has increased, the most common fixation between fixture and superstructure changed from screw retention to cement retention 7) . The screw-retention system has limitation on clinical application in esthetic regions of the maxillary anterior teeth and mandibular premolars, because the screw holes disturb the appearance.…”

Section: Introductionmentioning

confidence: 99%

The effective design of zirconia coping on titanium base in dental implant superstructure

et al. 2018

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Zirconia exhibits good tissue compatibility and nontoxicity, making it a widely used esthetic replacement material for implant abutments. To avoid abutment-fracture, the parts composed of zirconia with a bonded metal component connected to the implant can be used. The purpose of this study was to design titanium and zirconia components with high fracture resistance at the zirconia component's edge line. Three edge line designs of the titanium base and zirconia sleeve were made: chamfer, shoulder, and backtaper. To assess the strength of the abutment design, static loads were applied vertically and 30 degrees from the vertical axis. A test of tensile strength was also performed after chewing simulation. Conventional zirconia components mounted on a chamfer-type titanium base showed significantly lower fracture resistance than shoulder and back-taper types. This study suggests that to improve the durability of zirconia abutments with a titanium base, a back-tapered edge design is recommended.

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Evaluation of cement-retained versus screw-retained implant-supported restorations for marginal bone loss

Cited by 140 publications

References 44 publications

Retention System and Splinting on Morse Taper Implants in the Posterior Maxilla by 3D Finite Element Analysis

Retention System and Splinting on Morse Taper Implants in the Posterior Maxilla by 3D Finite Element Analysis

Splinted and Nonsplinted Crowns with Different Implant Lengths in the Posterior Maxilla by Three-Dimensional Finite Element Analysis

The effective design of zirconia coping on titanium base in dental implant superstructure

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