Reverse torque evaluation in indexed and nonindexed abutments of Morse Taper implants in a mechanical fatigue test

Martins, Caio Marques; Ramos, Elimário Venturin; Kreve, Simone; Carvalho, Geraldo Alberto Pinheiro de; Franco, Aline Batista Gonçalves; Macedo, Luís Guilherme Scavone de; Silva, Alecsandro de Moura; Dias, Sérgio Candido

doi:10.4103/1735-3327.250967

Cited by 9 publications

(16 citation statements)

References 26 publications

(35 reference statements)

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“…Per the manufacturer, MCC enables CAD‐CAM abutments to seat only in one position, which may have helped for higher RTVs despite the previously reported higher displacements 24 . However, varying RTVs were also reported for indexed versus nonindexed Morse Taper implants 37,38,40 . Conflicting results show that several factors may have a role in RTV differences with MCC and CC implants.…”

Section: Discussionmentioning

confidence: 99%

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Screw stability of CAD‐CAM titanium and zirconia abutments on different implants: An in vitro study

Yılmaz

Çakmak

Batak

et al. 2021

Clin Implant Dent Rel Res

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Background Limited information is available regarding the removal torque values (RTVs) of screws of different abutment materials when used with different implants. Purpose To evaluate the effect of implant type and abutment material (zirconia; Zir and titanium; Ti) on the RTVs of abutment screws after cyclic loading. Materials and methods Internal conical connection implants (CC, OsseoSpeed TX) and modified internal conical connection implants (MCC, OsseoSpeed EV) (n = 10) were clamped in resin dies. Zir and Ti (N = 20) custom abutments were tightened to implants (20 Ncm for CC and 25 Ncm for MCC) as specified by their manufacturers. The abutments were cyclically loaded by using a sequentially increased loading protocol; 2‐million cycles under 100 N, 3‐million cycles under 200 N, and 2‐million cycles under 300 N loads with 2 Hz. After 7 million cycles, RTVs (Ncm) were measured by using a torque gauge. The data were analyzed with ANOVA by using the restricted maximum likelihood estimation method. Tukey–Kramer adjustment was used for any significant interaction of implant‐abutment pairs (α = 0.05). Results Two CC implants, 1 with Ti and 1 with Zir abutment, fractured during cyclic loading (under 300 N loads within the 6th and 7th million cycles) and discarded for statistical analysis. Only implant type had a significant effect on RTVs (p <0.001). Screws of Ti abutments on MCC implants had significantly higher RTVs than the screws of Ti (p = 0.003) and Zir (p = 0.005) abutments on CC implants. Conclusions Implant type affected the RTVs, however, the RTVs were higher than the initial torque values for all groups. Screws of Ti abutments on implant, which required greater initial torque values had higher RTVs than the screws of Ti and Zir abutments on the implant that required smaller initial torque values. RTVs were similar for Zir and Ti abutment screws within each implant type.

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Section: Discussionmentioning

confidence: 99%

“…Had there been torque loss in the present study, the difference in ITVs would be crucial when interpreting the results. Nevertheless, the percent torque loss calculations give valid information and have been used previously to gauge screw performance 34,36‐38 …”

Section: Discussionmentioning

confidence: 99%

Screw stability of CAD‐CAM titanium and zirconia abutments on different implants: An in vitro study

Yılmaz

Çakmak

Batak

et al. 2021

Clin Implant Dent Rel Res

View full text Add to dashboard Cite

show abstract

“…the Indexed Morse taper system, which features an internal anti-rotational device, allowing greater stability of the set by promoting greater contact of the prosthetic component with the implant cone [8,9].…”

Section: Methodsmentioning

confidence: 99%

“…Oral 2021, 1 301 greater stability of the set by promoting greater contact of the prosthetic component with the implant cone [8,9].…”

Section: Introductionmentioning

confidence: 99%

Effect of Abutment Type and Tightening Sequence on Torque Maintenance Capacity after Mechanical Cycling in Splinted Implant-Supported Restorations

Nakano

Gomes

Queiroz

et al. 2021

Oral

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The aim of this study was to compare the screw removal torque of mini-conical prosthetic components and straight trunnion of indexed morse taper implants after mechanical cycling. The sample consisted of 40 implants and 20 mini-conical prosthetic components (MC group) and 20 straight trunnion components (ST group). Each group consisted of 10 specimens, with 2 implants in each, and cobalt–chromium metallic crowns were screwed into each sample. The components of the MC group received a torque of 20 N-cm with a digital torque wrench, and after 10 min were retightened with the same value as the initial torque. The components of the ST group received a torque of 30 N-cm, with a digital torque wrench, and after 10 min, they were retightened with the same value. The screws of the respective crowns of the two groups received a torque of 10 N-cm and after 10 min were retightened with the same value. Each group was subjected to the fatigue test in a mechanical cycler at 2,000,000 cycles, with a load of 250 N and frequency of 4 Hz. At the end of the fatigue test, the loosening torque of each screw of the specimens was measured through a digital torque wrench. The data were analyzed by two-way ANOVA and a Tukey test. In both groups, there were loss of torque. The results showed no statistic difference between MC and ST groups (p > 0.05).

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“…Implant and abutment manufacturers have sought to improve the design of the morse taper system to better adapt the implant-abutment interface. Thus, they developed the Indexed Morse taper system, which features an internal anti-rotational device, allowing greater stability of the set by promoting greater contact of the prosthetic component with the implant cone [8,9]. In all implant systems, the implant-component union determines the mechanical integrity, strength, and stability of the assembly.…”

Section: Introductionmentioning

confidence: 99%

Effect of Abutment Type and Tightening Sequence on Torque Maintenance Capacity after Mechanical Cycling in Splinted Implant-Supported Restorations

Nakano¹,

Gomes²,

Queiroz³

et al. 2021

Preprint

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The aim of this study was to compare the screw removal torque of mini conical prosthetic components and straight trunnion of indexed morse taper implants, after mechanical cycling. The sample consisted of 40 implants and 20 mini-conical prosthetic components (MC group) and 20 straight trunnion components (ST group). Each group consisted of 10 specimens, with 2 implants in each, and cobalt-chromium metallic crowns were screwed into each sample. The components of the MC group received a torque of 20 N.cm with a digital torque wrench and after 10 minutes were retightened with the same value as the initial torque. The components of the ST group received a torque of 30 N.cm, with a digital torque wrench and after 10 minutes, they were retightened with the same value. The screws of the respective crowns of the two groups received a torque of 10 N.cm and after 10 minutes were retightened with the same value. Each group was subjected to the fatigue test in a mechanical cycler at 2.000.000 cycles, with a load of 250 N and frequency of 4 Hz. At the end of the fatigue test, the loosening torque of each screw of the specimens was measured through a digital torque wrench. The data were analyzed by two-way ANOVA and Tukey test. In both groups, there were loss of torque. The results showed no statistic difference between MC and ST groups.

show abstract

Reverse torque evaluation in indexed and nonindexed abutments of Morse Taper implants in a mechanical fatigue test

Cited by 9 publications

References 26 publications

Screw stability of CAD‐CAM titanium and zirconia abutments on different implants: An in vitro study

Screw stability of CAD‐CAM titanium and zirconia abutments on different implants: An in vitro study

Effect of Abutment Type and Tightening Sequence on Torque Maintenance Capacity after Mechanical Cycling in Splinted Implant-Supported Restorations

Effect of Abutment Type and Tightening Sequence on Torque Maintenance Capacity after Mechanical Cycling in Splinted Implant-Supported Restorations

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