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Background
Mechanical and biological failures of implants are mainly associated with abutment screw instability, micro-movements or microgaps of implant-abutment joint. Also, the removal of abutment due to aesthetics improvement or replacement of prosthetic structures may negatively affect the integrity of implant-abutments connection.
Aim/Hypothesis
The aim of this in-vitro study was to evaluate the wear morphological aspects of the external hexagon and Morse taper implants after repeated removal of abutments.
Material and Methods
External hexagon and Morse taper implants were evaluated at initial moment and after torqueing of abutment. For Morse taper implants, two types of abutments were tested: G1) universal post through bolt and G2) universal post abutments. Torque and removal torque values were recorded in triplicate using a handheld digital torque meter. The samples were cross-sectioned for the evaluation of inner surface by scanning electron microscopy (SEM) and optical profilometry. The arithmetical roughness (Ra) and the maximum distance from peak to valley (Rt) were considered to evaluate the surface roughness. For the external hexagon the measurements were assessed on all six sides of the hexagon platform, and for Morse taper implants measurements were divided in three inner segments according to depth: edge, middle and bottom.
Results
Roughness analysis showed that all groups tested have a higher roughness after removal torque than the initial. The Morse taper (MT) universal abutment group (G2) revealed the highest Ra values (0.2031 ± 0.1413) when compared to MT universal post ( 0.1411 ± 0.0821) and extern hexagon (0.1032 ± 0.1690). Also, MT universal abutments showed the highest Rt values. Those results corroborate with the wear morphological characteristics detected by SEM.
Conclusions and clinical implications
The repeated removal of abutments increased the wear on the inner surfaces of implants as shown by roughness and microscopic analyses. That negatively affects the integrity of the implant-abutment joint. Such wear can increase the microgap sizes influencing the mechanical or biological behavior of the implant joints.
Background
Mechanical and biological failures of implants are mainly associated with abutment screw instability, micro-movements or microgaps of implant-abutment joint. Also, the removal of abutment due to aesthetics improvement or replacement of prosthetic structures may negatively affect the integrity of implant-abutments connection.
Aim/Hypothesis
The aim of this in-vitro study was to evaluate the wear morphological aspects of the external hexagon and Morse taper implants after repeated removal of abutments.
Material and Methods
External hexagon and Morse taper implants were evaluated at initial moment and after torqueing of abutment. For Morse taper implants, two types of abutments were tested: G1) universal post through bolt and G2) universal post abutments. Torque and removal torque values were recorded in triplicate using a handheld digital torque meter. The samples were cross-sectioned for the evaluation of inner surface by scanning electron microscopy (SEM) and optical profilometry. The arithmetical roughness (Ra) and the maximum distance from peak to valley (Rt) were considered to evaluate the surface roughness. For the external hexagon the measurements were assessed on all six sides of the hexagon platform, and for Morse taper implants measurements were divided in three inner segments according to depth: edge, middle and bottom.
Results
Roughness analysis showed that all groups tested have a higher roughness after removal torque than the initial. The Morse taper (MT) universal abutment group (G2) revealed the highest Ra values (0.2031 ± 0.1413) when compared to MT universal post ( 0.1411 ± 0.0821) and extern hexagon (0.1032 ± 0.1690). Also, MT universal abutments showed the highest Rt values. Those results corroborate with the wear morphological characteristics detected by SEM.
Conclusions and clinical implications
The repeated removal of abutments increased the wear on the inner surfaces of implants as shown by roughness and microscopic analyses. That negatively affects the integrity of the implant-abutment joint. Such wear can increase the microgap sizes influencing the mechanical or biological behavior of the implant joints.
Background
Mechanical and biological failures of implants are mainly associated with abutment screw instability, micro-movements or microgaps of implant-abutment joint. Also, the removal of abutment due to aesthetics improvement or replacement of prosthetic structures may negatively affect the integrity of implant-abutments connection.
Aim/Hypothesis
The aim of this in-vitro study was to evaluate the wear morphological aspects of the external hexagon and Morse taper implants after repeated removal of abutments.
Material and Methods
External hexagon and Morse taper implants were evaluated at initial moment and after torqueing of abutment. For Morse taper implants, two types of abutments were tested: G1) universal post through bolt and G2) universal post abutments. Torque and removal torque values were recorded in triplicate using a handheld digital torque meter. The samples were cross-sectioned for the evaluation of inner surface by scanning electron microscopy (SEM) and optical profilometry. The arithmetical roughness (Ra) and the maximum distance from peak to valley (Rt) were considered to evaluate the surface roughness. For the external hexagon the measurements were assessed on all six sides of the hexagon platform, and for Morse taper implants measurements were divided in three inner segments according to depth: edge, middle and bottom.
Results
Roughness analysis showed that all groups tested have a higher roughness after removal torque than the initial. The Morse taper (MT) universal abutment group (G2) revealed the highest Ra values (0.2031 ± 0.1413) when compared to MT universal post ( 0.1411 ± 0.0821) and extern hexagon (0.1032 ± 0.1690). Also, MT universal abutments showed the highest Rt values. Those results corroborate with the wear morphological characteristics detected by SEM.
Conclusions and clinical implications
The repeated removal of abutments increased the wear on the inner surfaces of implants as shown by roughness and microscopic analyses. That negatively affects the integrity of the implant-abutment joint. Such wear can increase the microgap sizes influencing the mechanical or biological behavior of the implant joints.
Background
Mechanical and biological failures of implants are mainly associated with abutment screw instability, micro-movements or microgaps of implant-abutment joint. Also, the removal of abutment due to aesthetics improvement or replacement of prosthetic structures may negatively affect the integrity of implant-abutments connection.
Aim/Hypothesis
The aim of this in-vitro study was to evaluate the wear morphological aspects of the external hexagon and Morse taper implants after repeated removal of abutments.
Material and Methods
External hexagon and Morse taper implants were evaluated at initial moment and after torqueing of abutment. For Morse taper implants, two types of abutments were tested: G1) universal post through bolt and G2) universal post abutments. Torque and removal torque values were recorded in triplicate using a handheld digital torque meter. The samples were cross-sectioned for the evaluation of inner surface by scanning electron microscopy (SEM) and optical profilometry. The arithmetical roughness (Ra) and the maximum distance from peak to valley (Rt) were considered to evaluate the surface roughness. For the external hexagon the measurements were assessed on all six sides of the hexagon platform, and for Morse taper implants measurements were divided in three inner segments according to depth: edge, middle and bottom.
Results
Roughness analysis showed that all groups tested have a higher roughness after removal torque than the initial. The Morse taper (MT) universal abutment group (G2) revealed the highest Ra values (0.2031 ± 0.1413) when compared to MT universal post ( 0.1411 ± 0.0821) and extern hexagon (0.1032 ± 0.1690). Also, MT universal abutments showed the highest Rt values. Those results corroborate with the wear morphological characteristics detected by SEM.
Conclusions and clinical implications
The repeated removal of abutments increased the wear on the inner surfaces of implants as shown by roughness and microscopic analyses. That negatively affects the integrity of the implant-abutment joint. Such wear can increase the microgap sizes influencing the mechanical or biological behavior of the implant joints.