Loosening torque of prosthetic screws in metal–ceramic or metal–acrylic resin implant-supported dentures with different misfit levels

Bacchi, Ataís; Paludo, Litiane; Mesquita, Marcelo Ferraz; Schuh, Christian; Federizzi, Leonardo; Spazzin, Aloísio Oro

doi:10.1016/j.jbiomech.2013.01.023

Cited by 13 publications

(11 citation statements)

References 26 publications

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“…Fernández and colleagues quantified the misfit of dental implant‐supported prostheses by comparing three manufacturing processes and found a correlation between surface roughness and microgap width . This microgap was associated with complications such as screw loosening or adverse biologic responses . But soft tissue response to superstructure surfaces (manufactured using various techniques) remains largely unknown.…”

Section: Discussionmentioning

confidence: 99%

“…46 This microgap was associated with complications such as screw loosening or adverse biologic responses. 47 But soft tissue response to superstructure surfaces (manufactured using various techniques) remains largely unknown. It cannot be excluded that micromovements between implants and prosthetic components enabling microbial leakage might have influenced the larger MBL at implants without abutment compared with the implants with a machined abutment.…”

Section: Discussionmentioning

confidence: 99%

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Bone Response and Soft Tissue Changes Around Implants With/Without Abutments Supporting Fixed Partial Dentures: Results From a 3‐Year, Prospective, Randomized, Controlled Study

Göthberg

André²,

Gröndahl³

et al. 2015

Clin Implant Dent Rel Res

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Bone Response and Soft Tissue Changes Around Implants With/Without Abutments Supporting Fixed Partial Dentures: Results From a 3‐Year, Prospective, Randomized, Controlled Study

Göthberg

André²,

Gröndahl³

et al. 2015

Clin Implant Dent Rel Res

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show abstract

“…It has been suggested that these structures are more sensitive to a lack of passive fit and are directly responsible for clinical failures such as loosening or fracture of the abutment or prosthetic screw and fracture of the framework or veneers (18) due to asymmetric contact among the various components of the system (28). The association between the vertical misfit and screw loosening has been established by previous studies (29).…”

Section: Figmentioning

confidence: 96%

Stress distribution in fixed-partial prosthesis and peri-implant bone tissue with different framework materials and vertical misfit levels: a three-dimensional finite element analysis

Bacchi¹,

Mesquita²,

Santos³

2013

J Oral Sci

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The purpose of this study was to evaluate the influence of superstructure material and vertical misfits on the stresses created in an implant-supported partial prosthesis. A three-dimensional (3-D) finite element model was prepared based on common clinical data. The posterior part of a severely resorbed jaw with two osseointegrated implants at the second premolar and second molar regions was modeled using specific modeling software (SolidWorks 2010). Finite element models were created by importing the solid model into mechanical simulation software (ANSYS Workbench 11). The models were divided into groups according to the prosthesis framework material (type IV gold alloy, silver-palladium alloy, commercially pure titanium, cobalt-chromium alloy, or zirconia) and vertical misfit level (10 µm, 50 µm, and 100 µm) created at one implant-prosthesis interface. The gap of the vertical misfit was set to be closed and the stress values were measured in the framework, porcelain veneer, retention screw, and bone tissue. Stiffer materials led to higher stress concentration in the framework and increased stress values in the retention screw, while in the same circumstances, the porcelain veneer showed lower stress values, and there was no significant difference in stress in the peri-implant bone tissue. A considerable increase in stress concentration was observed in all the structures evaluated within the misfit amplification. The framework material influenced the stress concentration in the prosthetic structures and retention screw, but not that in bone tissue. All the structures were significantly influenced by the increase in the misfit levels. (J Oral Sci 55, 239-244, 2013)

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“…However, inefficient fixation on the injured bone tissue may lead to the looseness and subsidence of a metal prosthesis, causing the failure of implantation. As a result, several efforts have been exerted to improve the clinical performance of fixing metal prostheses into bone tissues [2] .…”

Section: Introductionmentioning

confidence: 99%

Hydroxyapatite/β-tricalcium phosphate composite for guiding bone tissue growth into a titanium tube in 8 mm dog tibia cavity defects

Zhu

Chen

Wang

et al. 2016

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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We developed a fixation method and evaluate bone regrowth in the cavities of a f4 mm× 8 mm titanium (Ti) tube through porous hydroxyapatite (HAP)/β-tricalcium phosphate (β-TCP) composite filling (group A), chitosan/calcium phosphate composite filling (group B), and HAP particle modification (group C). After 2 and 5 months of implantation in dog tibia defects, new bone formation in the three groups was studied by histology and histomorphometry. Group A displayed the most bone regenerated area in both 2 and 5 months post-operation. The chitosan/calcium phosphate composite in group B mostly degraded 2 months after implantation, leading to fibrous tissue invasion after 5 months. By contrast, less bone formation was observed in group C. These results indicated that filling the cavities of metal prostheses with a porous HAP/β-TCP composite can be used for stable long-term fixation in clinical settings.

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Loosening torque of prosthetic screws in metal–ceramic or metal–acrylic resin implant-supported dentures with different misfit levels

Cited by 13 publications

References 26 publications

Bone Response and Soft Tissue Changes Around Implants With/Without Abutments Supporting Fixed Partial Dentures: Results From a 3‐Year, Prospective, Randomized, Controlled Study

Bone Response and Soft Tissue Changes Around Implants With/Without Abutments Supporting Fixed Partial Dentures: Results From a 3‐Year, Prospective, Randomized, Controlled Study

Stress distribution in fixed-partial prosthesis and peri-implant bone tissue with different framework materials and vertical misfit levels: a three-dimensional finite element analysis

Hydroxyapatite/β-tricalcium phosphate composite for guiding bone tissue growth into a titanium tube in 8 mm dog tibia cavity defects

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