Influence of reverse torque values in abutments with or without internal hexagon indexes

Cerutti-Kopplin, Daiane; Neto, Dimas João Rodrigues; Valle, Accácio Lins do; Pereira, Jefferson Ricardo

doi:10.1016/j.prosdent.2014.03.004

Cited by 17 publications

(12 citation statements)

References 14 publications

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“…The Morse system is defined in regard to the form of adaptation by friction between the metallic surfaces, known as cold welding, characterized by requirement of a reverse torque greater than the insertion torque to release the abutment. [16] In the present investigation, the initial torque given in the NI Pilar Flex abutments was 32 N/cm, but after the cycling fatigue test, two of the samples from this group had a removal torque of 34 N/cm. This stability gain did not occur in the IN Pilar Flex, which shows that only 5.4% of all 37 samples (IN + NI group) presented the “cold welding effect.…”

Section: Discussionmentioning

confidence: 52%

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

et al. 2019

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Background: This experimental study assessed reverse torque of indexed and nonindexed (NI) abutments in Morse Taper (MT) implants in a mechanical fatigue test. Materials and Methods: In this experimental study It was used 37 implants MT and over them installed Pilar Flex abutments (4.8 mm × 6 mm × 1.5 mm). The groups were as follows: Group A used 19 MT implants with a NI Pilar Flex abutment loaded with 32 N/cm and Group B used 18 MT implants with an indexed (IN) Pilar Flex abutment loaded with 20 N/cm. The abutments were tested according to ISO standard 14801/2007. The specimens were installed at 30° from the axial axis and underwent a 133 N load, 4 Hz frequency, and 1,000,000 cycles. Once the test was completed, the reverse torque was provided by an electronic torque meter. Data were submitted to statistical analysis using the t -test for independent samples and paired t -test. The significance level was considered P < 0.05. Results: Results obtained showed that the indexed Pilar Flex abutment had a percentage of torque loss from the initial torque of 49% and the NI Pilar Flex abutment lost 14%. Paired Student's t -tests revealed that for both NI ( P < 0.001) and indexed ( P < 0.001) abutments, the counter torque values were significantly lower than those applied at the initial torque. Conclusion: According on the methodology used, the NI Pilar Flex abutment was more effective regarding the reverse torque in single-unit implant prostheses versus the indexed Pilar Flex abutment. A greater loosening in the indexed Pilar Flex abutment retaining screw was noted in the reverse torque test, and the Pilar Flex abutment failed to show good outcomes related to the cold welding effect.

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Section: Discussionmentioning

confidence: 52%

“…Implant dentistry is a constantly evolving specialty, where antirotational systems for prosthesis–implant connections have been frequently modified in pursuit of a better adaptation with fewer risks of fracture and abutment retaining screw loosening. [12]…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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“…Furthermore, dental implants with Morse taper connection or internal hex connection showed similar failure rate 10 . Since these two types of connection designs have their own advantages and disadvantages, recently, manufacturers combined these two types of connection designs and came up with internal hex combined with Morse taper design 11 , 12 . Hopefully, this new design can combine the benefits of internal hex and Morse taper designs.…”

Section: Discussionmentioning

confidence: 99%

The compressive strength of implant-abutment complex with different connection designs

Huang

Pan

2019

Journal of Dental Sciences

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Background/purposeImplant-abutment connection is the component responsible for the transmitting of occlusal force from the crown down to the implant fixture. Different connection geometric structure will lead to different mechanical performance. The purpose of this study was to compare the stability of internal hex Implant -abutment connection with internal hex with Morse taper implant-abutment connection by testing their compressive strength.Materials and methodsThis was an in vitro study. The test group and the control group had 8 specimens separately. The test group was internal hex combined with Morse taper implant connection design, and the control group was internal hex connection design. Static force was applied to the specimens at a 30° angle until failure. The testing protocol was designed according to ISO14801 regulations. We compared the compressive strength of both groups.ResultsThe control group showed significantly higher compressive strength than the test group (p < 0.0001).ConclusionsFor the compressive strength of implant abutment complex, incorporating Morse taper design into internal hex connection failed to enhance its mechanical performance. According to this study, internal hex connection has higher compressive strength than internal hex connection combined with Morse taper design.

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“…The design of the implant connection may also influence the implant-abutment interface, since this is the area of higher stress concentration in the system. 15 16 17 External connections (EH) have the lowest torque loosening, when compared with the internal hexagonal connection (IH), 18 19 and better stress distribution, since they present a higher contact area between the abutment and implant platforms than IH. 20…”

Section: Introductionmentioning

confidence: 99%

Effect of Implant Platform Connection and Abutment Material on Removal Torque and Implant Hexagon Plastic Deformation

et al. 2019

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Objectives The aim of this study was to evaluate the plastic deformation of the hexagonal connection, and the removal torque of the implant-abutment joint of two dental implants combined with internal or external hexagonal connection implants after mechanical cycling. Materials and Methods Twenty-four dental implants were used in the study. Half of the implants had internal hexagonal connections (IH; Titamax II Plus) and the other half had external hexagonal connections (EH; Titamax Ti Ex). Four groups of two types of dental implant abutments (titanium: Ti, UCLA II Plus and zirconia: Zr, fabricated by CAD/CAM; n = 6) were investigated. The abutments received a metallic crown and the settings were submitted to mechanical cycling (MC; 10 6 cycles, axial load, 120N). The connection surface area was measured by scanning electron microscope (SEM) images. The removal torque was evaluated and the plastic deformation of the hexagonal surface of the implant was measured by comparing the images before and after MC. Statistical Analysis Paired- t test was used to analyze the data statistically at a significance level of α = 0.05. Results The torque values decreased for all groups after MC, and the hexagonal surface area decreased due to plastic deformation for IH and EH associated with Zr abutments. Conclusions Zirconia abutments showed the worst plastic deformation of the implant connection surface and torque loosening when associated with IH implant.

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Influence of reverse torque values in abutments with or without internal hexagon indexes

Cited by 17 publications

References 14 publications

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

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

The compressive strength of implant-abutment complex with different connection designs

Effect of Implant Platform Connection and Abutment Material on Removal Torque and Implant Hexagon Plastic Deformation

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