Abstract : Removal torque pattern of a combined cone and octalobule index implant-abutment connection at different cyclic loading: an in-vitro experimental study
Despite the high survival rate of dental implants, screw loosening is frequently reported. Screw loosening can cause a misfit of the implant-abutment connection leading to peri-implantitis or abutment screw fracture. Therefore, studies about related factors and mechanism of screw loosening are needed. The aim of this study was to evaluate the decreasing pattern of removal torque values (RTVs) of a combined cone and octalobule index implant-abutment connection under different numbers of mechanical loading cycles.
The study was performed in accordance with ISO 14801:2007. Eighty-four implants with the combined cone and octalobule index implant-abutment connection (PW Plus dental implant system, PW Plus Company) were used. All abutment screws were tightened 30 N cm twice with a 10-min interval. The control group was without cyclic loading and the experimental groups underwent different numbers of loading cycles until 2,000,000 cycles. Then, the abutment screws of all samples were untightened to measure the RTVs. The data were analyzed using ANOVA and Tukey’s HSD test.
The RTVs of the control group decreased 7.78% compared to the insertion torque. All experimental groups from 50,000 to 2,000,000 cycles showed significant decreases in RTVs compared to the control group (P < 0.05). RTVs in the group of 50,000 cycles to 1,800,000 cycles did not change significantly, but there was a significant reduction of RTVs in the group of 2,000,000 cycles when compared to the group of 50,000 cycles (P < 0.05).
According to the setting condition for the fatigue test complied to ISO 14801:2007, the RTVs of the combined cone and octalobule index implant-abutment connection reduced significantly after 50,000 cycles and did not change significantly until 2,000,000 cycles.
Serial posts:
- Abstract : Removal torque pattern of a combined cone and octalobule index implant-abutment connection at different cyclic loading: an in-vitro experimental study
- Background : Removal torque pattern of a combined cone and octalobule index implant-abutment connection at different cyclic loading: an in-vitro experimental study [1]
- Background : Removal torque pattern of a combined cone and octalobule index implant-abutment connection at different cyclic loading: an in-vitro experimental study [2]
- Background : Removal torque pattern of a combined cone and octalobule index implant-abutment connection at different cyclic loading: an in-vitro experimental study [3]
- Materials and methods : Removal torque pattern of a combined cone and octalobule index implant-abutment connection at different cyclic loading: an in-vitro experimental study [1]
- Materials and methods : Removal torque pattern of a combined cone and octalobule index implant-abutment connection at different cyclic loading: an in-vitro experimental study [2]
- Results : Removal torque pattern of a combined cone and octalobule index implant-abutment connection at different cyclic loading: an in-vitro experimental study
- Discussion : Removal torque pattern of a combined cone and octalobule index implant-abutment connection at different cyclic loading: an in-vitro experimental study [1]
- Discussion : Removal torque pattern of a combined cone and octalobule index implant-abutment connection at different cyclic loading: an in-vitro experimental study [2]
- Discussion : Removal torque pattern of a combined cone and octalobule index implant-abutment connection at different cyclic loading: an in-vitro experimental study [3]
- Discussion : Removal torque pattern of a combined cone and octalobule index implant-abutment connection at different cyclic loading: an in-vitro experimental study [4]
- Conclusion : Removal torque pattern of a combined cone and octalobule index implant-abutment connection at different cyclic loading: an in-vitro experimental study
- Abbreviations : Removal torque pattern of a combined cone and octalobule index implant-abutment connection at different cyclic loading: an in-vitro experimental study
- References : Removal torque pattern of a combined cone and octalobule index implant-abutment connection at different cyclic loading: an in-vitro experimental study [1]
- References : Removal torque pattern of a combined cone and octalobule index implant-abutment connection at different cyclic loading: an in-vitro experimental study [2]
- References : Removal torque pattern of a combined cone and octalobule index implant-abutment connection at different cyclic loading: an in-vitro experimental study [3]
- References : Removal torque pattern of a combined cone and octalobule index implant-abutment connection at different cyclic loading: an in-vitro experimental study [4]
- Acknowledgements : Removal torque pattern of a combined cone and octalobule index implant-abutment connection at different cyclic loading: an in-vitro experimental study
- Author information : Removal torque pattern of a combined cone and octalobule index implant-abutment connection at different cyclic loading: an in-vitro experimental study
- Ethics declarations : Removal torque pattern of a combined cone and octalobule index implant-abutment connection at different cyclic loading: an in-vitro experimental study
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- About this article : Removal torque pattern of a combined cone and octalobule index implant-abutment connection at different cyclic loading: an in-vitro experimental study
- Table 1 Mean removal torque values (N cm) of the abutment screws of the implant-abutment connections in all groups (Of: Removal torque pattern of a combined cone and octalobule index implant)
- Table 2 One-way ANOVA for the difference in removal torque values among groups with different numbers of mechanical loading cycles (Of: Removal torque pattern of a combined cone and octalobule index implant)
- Table 3 Post hoc Tukey’s HSD test of mean removal torque values in all groups (Of: Removal torque pattern of a combined cone and octalobule index implant)
- Fig. 1. Cone connection combined with octalobular index (Octatorx) : Removal torque pattern of a combined cone and octalobule index implant
- Fig. 2. Schematic of test setup according to The ISO 14801 recommendations : Removal torque pattern of a combined cone and octalobule index implant
- Fig. 3. Implant assembly embedded in resin block : Removal torque pattern of a combined cone and octalobule index implant
- Fig. 4. Tightening the abutment screw and measuring the RTVs : Removal torque pattern of a combined cone and octalobule index implant
- Fig. 5. Specimen mounted in a 30°-angled steel holder in ElectroPuls E1000 dynamic testing machine : Removal torque pattern of a combined cone and octalobule index implant
- Fig. 6. Specimen mounted in a 30°-angled steel holder : Removal torque pattern of a combined cone and octalobule index implant
- Fig. 7. Schematic diagram for experimental procedure : Removal torque pattern of a combined cone and octalobule index implant
- Fig. 8. Change in RTVs according to the numbers of mechanical loading cycles : Removal torque pattern of a combined cone and octalobule index implant