The effect of fatigue loading on the screw joint stability of zirconium abutment

Tsumita, Mitsuyoshi; Kokubo, Yuji; Kano, Takamitsu; Sasaki, Keita

doi:10.1016/j.jpor.2013.02.004

Cited by 8 publications

(6 citation statements)

References 13 publications

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“…Other studies also reported similar results in this respect. For instance, Tsumita et al examined the effect of fatigue loading on the screw joint durability of zirconia abutments and concluded that zirconia abutments had similar durability to titanium abutments (17), which is in line with our findings.…”

Section: Discussionsupporting

confidence: 90%

Laboratory Evaluation of Torque Loss in Titanium, One-Piece and Two-Piece Zirconia Abutments Under Cyclic Loading

Amraei

Heidari²,

Khazaei

et al. 2020

Avicenna J Dent Res

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Background: Screw loosening is one of the most common problems associated with implant-supported prostheses. The type and material of the abutment play an important role in the esthetic appearance of implant-supported restorations. Metal abutments create an unaesthetic grayish halo in the gingival margin of the implant due to the reflection of light from the surface of titanium abutment. Zirconia is highly popular for the fabrication of abutments due to its optimal color, along with the quality of light transmission and its resistance. The present study aimed to evaluate the torque loss in titanium and one- and two-piece zirconia abutments under cyclic loading. Methods: In general, 24 abutments in three groups (n=8) of one- and two-piece zirconia abutments, and titanium abutments were evaluated in this experimental study. The abutments were attached to the analog of fixtures with 30 N/cm torque and the samples were subjected to loads applied to the center of abutments at 30° angle. After cyclic loading, the removal torque value was measured for each abutment and its numerical mean was calculated as well. Finally, the groups were compared using SPSS16 via ANOVA and Games-Howell tests at a 0.05 level of significance. Results: The mean removal torque value was 23.925, 23.913, and 22.538 N/cm in titanium and two- and one-piece zirconia abutments, respectively, with no statistically significant difference in between (P>0.05). Conclusions: The highest mean removal torque value belonged to prefabricated titanium abutments while the lowest value was related to one-piece zirconia abutments.

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Section: Discussionsupporting

confidence: 90%

Laboratory Evaluation of Torque Loss in Titanium, One-Piece and Two-Piece Zirconia Abutments Under Cyclic Loading

Amraei

Heidari²,

Khazaei

et al. 2020

Avicenna J Dent Res

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“…Despite the high number of clinical and experimental studies, the exact cause of abutment screw loosening has remained unknown [38]. Inadequate tightening torque, improper implant position, inadequate occlusal plane or crown anatomy, racks and coping with poor adaptation, presence of microleakage at the implant-abutment interface, inappropriate design/material of the screw, and heavy occlusal forces can be considered the reasons for abutment screw loosening [17,[39][40][41]. Abutment screw loosening can cause prosthetic mobility, for which the prosthesis needs to be removed to tighten the abutment [42].…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Effect of Four Different Abutment Screw Torques on Screw Loosening in Single Implant-Supported Prosthesis after the Application of Mechanical Loading

Ebadian

Fathi

Khodadad

2021

International Journal of Dentistry

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Background. The complications of implant-supported prostheses can be classified into mechanical and biological ones, one part of which is associated with screw loosening. This study was aimed to compare the effect of four different abutment screw torque techniques on screw loosening in single implant-supported prostheses following the application of mechanical loading. Materials and Methods. In this experimental study, a total of 40 implants in acrylic blocks (6 × 10 × 20 mm) were mounted perpendicular to the surface. They were then randomly divided into four groups: (1) torquing once with 30 Ncm, (2) torquing three times with 30 Ncm and 5-minute intervals, (3) torquing once with 30 Ncm, opening the screw, and retorquing with 30 Ncm, and (4) torquing once with 35 Ncm. The torque values were confirmed by using a digital torque meter. Then, the samples underwent a force (2 cps, 0.453–11.793 kg) for three hours before the measurement of detorque values. The screw loosening force (torque) was then measured and recorded. The obtained data were analyzed by SPSS (version 22) software using one-way ANOVA and Tukey post hoc test at a 5% error level. Results. The maximum mean detorque values of the abutment screws in single implant-supported prostheses were reported for groups 4 (27.8 ± 1.3), 1 (26.8 ± 1.3), and 3 (25.1 ± 1.3), and the minimum mean detorque value was found in group 2 (24.9 ± 1.2). Moreover, no significant difference was observed between groups 2 and 3 ( p > 0.05 ), but a significant difference was found between groups 1 and 3 and other groups ( p < 0.05 ). Conclusion. The increase in the torque value increased the torque loss. However, the detorque value in group 4 showed the least difference with the value recommended by the manufacturer (30 Ncm).

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“…Inadequate tightening torque, settling of implant components, inappropriate implant position, inadequate occlusal scheme or crown anatomy, poorly fitting frameworks, presence of microleakage at the abutment-implant interface, improper screw design/material, and heavy occlusal forces can cause implant screw loosening 5678…”

Section: Introductionmentioning

confidence: 99%

Comparative study of abutment screw loosening with or without adhesive material

et al. 2017

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PURPOSEThe purpose of this study was to achieve more retention and stability and to delay or prevent screw loosening.MATERIALS AND METHODSTwenty implants (Implantium 3.4 mm, Dentium, Seoul, Korea) were divided into 2 groups (n = 20). In the first group, an adhesive material was applied around the screw of the abutments (test group). In the second group, the screws are soaked in saliva (control group). All the screws were torqued under 30 N/cm, Then, the samples were gone through a cyclic fatigue loading process. After cyclic loading, we detorqued screws and calculated detorque value.RESULTSIn comparison with the control group, all the implant screws in the test group were smeared with the adhesive material, showing significant higher detorque value.CONCLUSIONThere are significantly higher detorque values in the group with adhesive. It is recommended to make biocompatible adhesive to reduce screw loosening.

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The effect of fatigue loading on the screw joint stability of zirconium abutment

Abstract: Zirconia abutments for external hexagon implants had durability rates similar to those of titanium abutments after repeating load on the reverse torque of the abutment screw, indicating that the zirconia abutment could be reliably used instead of the titanium abutment.

Cited by 8 publications

References 13 publications

Laboratory Evaluation of Torque Loss in Titanium, One-Piece and Two-Piece Zirconia Abutments Under Cyclic Loading

Laboratory Evaluation of Torque Loss in Titanium, One-Piece and Two-Piece Zirconia Abutments Under Cyclic Loading

Comparison of the Effect of Four Different Abutment Screw Torques on Screw Loosening in Single Implant-Supported Prosthesis after the Application of Mechanical Loading

Comparative study of abutment screw loosening with or without adhesive material

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