Removal Torque and Biofilm Accumulation at Two Dental Implant–Abutment Joints After Fatigue

Pereira, Jorge; Morsch, Carolina Schäffer; Henriques, Bruno; Nascimento, Rubens Maribondo do; Benfatti, César Am; Silva, Filipe; López‐López, José; Souza, Júlio C. M.

doi:10.11607/jomi.4173

Cited by 31 publications

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“…The mechanical integrity of different implant‐abutment connections has been studied both in vitro and in vivo . Previous studies have shown a significantly higher percentage of mechanical instability in external hexagon implant connections when compared to internal connections .…”

Section: Dental Implant Connectionsmentioning

confidence: 99%

“…The long‐term mechanical integrity of the implant‐abutment connection can be evaluated by measuring the removal torque at certain periods of clinical inspection . The microgaps present at the implant‐abutment connection compromise the sealing performance of the MT connection leading to the penetration of substances (eg, glycoproteins, water, acidic substances) and microorganisms . Glycoproteins, water and biofilms act as lubricant biological materials decreasing the friction on the titanium surfaces and causing micromovements of the implant‐abutment components .…”

Section: Dental Implant Connectionsmentioning

confidence: 99%

“…Various factors can influence the stress distribution at implant‐abutment connections such as loading condition, connection misfit, material properties, connection geometry, contact length and the coefficient of friction . Furthermore, micromovements occur at the implant‐abutment connection during occlusal loading leading to fatigue and wear of the contacting materials . At implant‐abutment connections, the abutment screw is subjected to the highest stress concentrations, mainly at the neck region .…”

Section: Distribution Of Stresses At Dental Implant Connectionsmentioning

confidence: 99%

“…Biofilms act as lubricants, decreasing friction between contacting prosthetic surfaces . A mean interfacial discrepancy of about 0.5‐60 μm in implant‐abutment gaps has been reported in the literature . As the diameter of microorganisms is <10 μm, the implant‐abutment gaps can be effortlessly filled by several microorganisms.…”

Section: Peri‐implant Environment Conditionsmentioning

confidence: 99%

“…As the diameter of microorganisms is <10 μm, the implant‐abutment gaps can be effortlessly filled by several microorganisms. In addition, the penetration of microorganisms in implant internal connections can be caused by microbial leakage at the implant‐abutment joints . Bacteria have been found on the screw threads and in the apical portion of the abutment screw .…”

Section: Peri‐implant Environment Conditionsmentioning

confidence: 99%

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Synergistic interactions between corrosion and wear at titanium‐based dental implant connections: A scoping review

Apaza‐Bedoya

Tarce

Benfatti

et al. 2017

J of Periodontal Research

116

110

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Two-piece implant systems are mainly used in oral implantology involving an osseointegrated implant connected to an abutment, which supports prosthetic structures. It is well documented that the presence of microgaps, biofilms and oral fluids at the implant-abutment connection can cause mechanical and biological complications. The aim of this review paper was to report the degradation at the implant-abutment connection by wear and corrosion processes taking place in the oral cavity. Most of the retrieved studies evaluated the wear and corrosion (tribocorrosion) of titanium-based materials used for implants and abutments in artificial saliva. Electrochemical and wear tests together with microscopic techniques were applied to validate the tribocorrosion behavior of the surfaces. A few studies inspected the wear on the inner surfaces of the implant connection as a result of fatigue or removal of abutments. The studies reported increased microgaps after fatigue tests. In addition, data suggest that micromovements occurring at the contacting surfaces can increase the wear of the inner surfaces of the connection. Biofilms and/or glycoproteins act as lubricants, although they can also amplify the corrosion of the surfaces. Consequently, loosening of the implant-abutment connection can take place during mastication. In addition, wear and corrosion debris such as ions and micro- and nanoparticles released into the surrounding tissues can stimulate peri-implant inflammation that can lead to pathologic bone resorption.

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Section: Dental Implant Connectionsmentioning

confidence: 99%

Section: Dental Implant Connectionsmentioning

confidence: 99%

Section: Distribution Of Stresses At Dental Implant Connectionsmentioning

confidence: 99%

Section: Peri‐implant Environment Conditionsmentioning

confidence: 99%

Section: Peri‐implant Environment Conditionsmentioning

confidence: 99%

See 3 more Smart Citations

Synergistic interactions between corrosion and wear at titanium‐based dental implant connections: A scoping review

Apaza‐Bedoya

Tarce

Benfatti

et al. 2017

J of Periodontal Research

116

110

View full text Add to dashboard Cite

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Biomechanical analyses of one‐piece dental implants composed of titanium, zirconia, PEEK, CFR‐PEEK, or GFR‐PEEK: Stresses, strains, and bone remodeling prediction by the finite element method

et al. 2021

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This work aimed to assess the biomechanics, using the finite element method (FEM), of traditional titanium Morse taper (MT) dental implants compared to one-piece implants composed of zirconia, polyetheretherketone (PEEK), carbon fiber-reinforced PEEK (CFR-PEEK), or glass fiber-reinforced PEEK (GFR-PEEK). MT and one-piece dental implants were modeled within a mandibular bone section and loaded on an oblique force using FEM. A MT implant system involving a Ti6Al4V abutment and a cp-Ti grade IV implant was compared to one-piece implants composed of cp-Ti grade IV, zirconia (3Y-TZP), PEEK, CFR-PEEK, or GFR-PEEK. Stress on bone and implants was computed and analyzed while bone remodeling prediction was evaluated considering equivalent strain. In comparison to one-piece implants, the traditional MT implant revealed higher stress peak (112 MPa). The maximum stresses on the onepiece implants reached $80 MPa, regardless their chemical composition. MT implant induced lower bone stimulus, although excessive bone strain was recorded for PEEK implants. Balanced strain levels were noticed for reinforced PEEK implants of which CFR-PEEK one-piece implants showed proper biomechanical behavior. Balanced strain levels might induce bone remodeling at the peri-implant region while maintaining low risks of mechanical failures. However, the strength of the PEEKbased composite materials is still low for long-term clinical performance.biomechanics, dental implants, dental materials, finite elements analysis, implant design 1 | INTRODUCTION Titanium dental implants have been increasingly used to replace missing teeth within a high long-term success rate as reported in literature. [1][2][3][4] Dental implants are often composed of two components: the endosseous implant itself and the abutment. The connection between traditional abutment and endosseous implants can be commonly achieved by screwing the abutment in the inner implant surfaces up to a maximum adequate torque or within a Morse taper (MT) effect, in which an applied preload generates stresses that keep the components attached to each each other. 5,6 At last, a single-or multi-unit prosthesis is cemented and/or screwed over the abutment to replace the coronal dental structure. MT implant systems typically reveal higher mechanical stability due to their connection on contacting surfaces and distribution of stresses to the bone. [5][6][7][8] However, the microgap existing between

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Surface modification of zirconia or lithium disilicate-reinforced glass ceramic by laser texturing to increase the adhesion of prosthetic surfaces to resin cements: an integrative review

et al. 2023

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Objective The purpose of this study was to perform an integrative review on laser texturing the inner surface of lithium disilicate-reinforced glass ceramic or zirconia to increase their bond strength to resin-matrix cements. Materials and method A bibliographic review was performed on PubMed using the following search terms: “zirconia” OR “lithium disilicate” AND “laser” AND “surface” OR “roughness” AND “bond strength” AND “luting agent” OR “resin cement.” Studies published in English language until March 15, 2023, were selected regarding the purpose of this study. Results A total of fifty-six studies were identified althoug thirteen studies were selected. The findings revealed that zirconia surfaces were significantly modified after laser irradiation resulting in macro-scale aligned retentive regions with depth values ranging from 50 to 120 µm. Average roughness values of laser-textured zirconia by Er,Cr:YSGG laser (~ 0.83 µm) were quite similar when compared to grit-blasted zirconia surfaces (~ 0.9 µm) although roughness increased up to 2.4 µm depending on the laser type and parameters. Lithium disilicate-reinforced glass ceramics textured with Er:YAG revealed an average roughness of around 3.5 µm while surfaces textured using Nd:YAG laser revealed an average roughness of 2.69 µm; that was quite similar to the roughness values recorded for etched surfaces (2.64 µm). The shear bond strength (SBS) values of zirconia surfaces textured on Nd:YVO4 laser irradiation were slightly higher (~ 33.5 MPa) than those recorded for grit-blasted zirconia surfaces (28 MPa). Laser-textured zirconia surfaces on CO2 laser revealed higher SBS values (18.1 ±0.8 MPa) than those (9.1 ± 0.56 MPa) recorded for untreated zirconia surfaces. On lithium disilicate-reinforced glass ceramics, higher SBS values to resin-matrix cements were recorded for specimens textured with a combination of fractional CO2 laser irradiation and HF acid etching (~ 22–24 MPa) when compared with grit-blasted specimens (12.2 MPa). Another study revealed SBS values at around 27.5 MPa for Er:YAG-textured lithium disilicate-reinforced glass ceramics to resin-matrix cements. Conclusions The laser irradiation at high power increases the roughness of the inner surface of lithium disilicate-reinforced glass ceramic or zirconia leading to an enhanced bond strength to resin-matrix cements. Thus, the laser type and irradiation parameters can be adjusted to enhance the macro- and micro-scale retention of zirconia and glass ceramic surfaces to resin-matrix cements. Clinical relevance Alternative methods for surface modification of lithium disilicate-reinforced glass ceramic and zirconia surfaces have been assessed to provide proper morphological aspects for enhanced adhesion to resin-matrix cements. An increase in the bond strength of glass ceramics or zirconia to resin-matrix cements can improve the long-term performance of cemented prosthetic structures in the oral cavity.

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Removal Torque and Biofilm Accumulation at Two Dental Implant–Abutment Joints After Fatigue

Cited by 31 publications

References 0 publications

Synergistic interactions between corrosion and wear at titanium‐based dental implant connections: A scoping review

Synergistic interactions between corrosion and wear at titanium‐based dental implant connections: A scoping review

Biomechanical analyses of one‐piece dental implants composed of titanium, zirconia, PEEK, CFR‐PEEK, or GFR‐PEEK: Stresses, strains, and bone remodeling prediction by the finite element method

Surface modification of zirconia or lithium disilicate-reinforced glass ceramic by laser texturing to increase the adhesion of prosthetic surfaces to resin cements: an integrative review

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