Reliability and failure modes of internal conical dental implant connections

Freitas-Júnior, Amilcar C.; Almeida, Érika Oliveira de; Bonfante, Estevam A.; Silva, Nelson R.F.A.; Coelho, Paulo G.

doi:10.1111/j.1600-0501.2012.02443.x

Cited by 49 publications

(63 citation statements)

References 32 publications

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“…Historically, the external hexagon connection was designed to provide a rotational torque transferring mechanism for implant placement [4,5]. Reversibility and an anti-rotational mechanism are some advantages of this connection.…”

Section: Introductionmentioning

confidence: 99%

“…However, the external hexagon allows the existence of a microgap in the implant-abutment interface. Besides, this system is less favorable for stress distribution and has lower stability when compared to internal connection, which increases the stress over the abutment screw and micromovements during loading [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…However, this connection did not provide an intimate implant-abutment contact, which is a characteristic of the internal conical connection (Morse taper connection). Through this intimate relation between the conical geometry of the abutment and the corresponding surface of the implant, the Morse taper connection provides great stability and bacterial seal [3][4][5]7].…”

Section: Introductionmentioning

confidence: 99%

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Is the internal connection more efficient than external connection in mechanical, biological, and esthetical point of views? A systematic review

Goiato

Pellizzer

Silva

et al. 2015

Oral Maxillofac Surg

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The external and internal connections have different mechanical, biological, and esthetical characteristics. Besides all systems that show proper success rates and effectiveness, crestal bone level maintenance is more important around internal connections than external connections. The Morse taper connection seems to be more efficient concerning biological aspects, allowing lower bacterial leakage and bone loss in single implants, including aesthetic regions. Additionally, this connection type can be successfully indicated for fixed partial prostheses and overdenture planning, since it exhibits high mechanical stability.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Is the internal connection more efficient than external connection in mechanical, biological, and esthetical point of views? A systematic review

Goiato

Pellizzer

Silva

et al. 2015

Oral Maxillofac Surg

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“…However, the precise mechanism of the load transferring is not fully understood, but it is certain that there is a remodeling response around the bone under particular tension [2,3]. Since both the definition and principles of osseointegration, various abutment/implant connection designs are available for clinical use in order to improve loading distribution [4].…”

Section: Introductionmentioning

confidence: 99%

Strain Gauge: study of strain distributions around three Morse taper prosthetic connections with offset positioning in machined and plastic copings under vertical load

Santos

Sousa

Louzada

et al. 2012

BDS

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The aim of this study was to evaluate through strain gauge the strain distribution occurred around 3 Morse taper implants with positioning offset, by varying the types of copings: plastic and machined. Microunit prosthetic abutments were connected onto the implant platforms. Ten frameworks composed of 3 copings were casted in cobalt-chromium alloy as single block (Co-Cr). Half of the copings were machined (n=5) and half were made of plastics (n=5). Four strain gauges were placed into the polyurethane block tangential to the 3 implants. The frameworks were fixed at their respective sites with the aid of a retaining screw with torque of 20 N.cm, achieve with a mechanical torquemeter. The vertical load of 30 Kg was applied through a spherical point of 2 mm diameter for 10 s, onto each one of the 3 screws of the framework through a device for load application The records of the strain reading were submitted to ANOVA and Tukey tests (5%). There were statistically significant differences (p=0.0174) between the coping type used (machined and plastic). The micro strain mean values were: point C at the machined coping 282.5 ?m (±120.8), point B at the machined coping 229.5 ?m (±76.1), point A at the machined coping 209.8 ?m (±55.0), point C at the plastic coping 155.0 ?m (±30.5), point B at the plastic coping 146.2 ?m (±25.8) and point A at the plastic coping 130.36 ?m (±21.83). It was concluded that there was a significant difference between the coping types, once the plastic coping exerted smaller micro strain on Morse taper implants than the machined copings.

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“…Additionally, it should be taken into account that nowadays, market competition and patients' demands force the producers to introduce the new or modified design in very short design cycles. Therefore, there is the need to develop of the efficient procedure for fatigue fracture risk minimization.Many researchers undertake the implant failure problem using laboratory tests [7,9,10,11,13,20,23,27,29,31,32] and numerical approach [17]. Among the others, special attention should be paid to the studies done by Wierszycki [38] and Ilies [20].…”

mentioning

confidence: 99%

experimental verification of the two component implant optimization results in context of fatigue life

Szajek¹,

Wierszycki²,

Topoliński³

et al. 2017

EiN

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Article citation info: (*) Tekst artykułu w polskiej wersji językowej dostępny w elektronicznym wydaniu kwartalnika na stronie www.ein.org.pl IntroductionDental implant is expected to be serviced as long as it is able to fulfill biological, esthetical and functional requirements. There is no service life for any of its components considered. Therefore, the proper design should based on the assumption that the implant service life has to be longer than the maximal patients' life expectancy regardless of biological and biomechanical conditions.According to the retrospective studies [12,26,30] one of the problems reported in long term service of the implants is fatigue failure. Systematic review of twentysix followup studies estimated a cumulative incidence of implant fractures after 5 years on the level of 0.14% [22]. However, the fracture ratio for the followup studies for up to 15 years [2] rises drastically and can reach even 16% in the maxilla. Dental implant failure usually results in an expensive, long term therapy often accompanied by the patient's trauma. It makes the fatigue resistance crucial feature to be include in implant designing. The significant rise in fatigue fracture cases after 5 years, which the followup studies are mostly limited to, can suggest that this period is inadequate to examine this phenomenon. Additionally, it should be taken into account that nowadays, market competition and patients' demands force the producers to introduce the new or modified design in very short design cycles. Therefore, there is the need to develop of the efficient procedure for fatigue fracture risk minimization.Many researchers undertake the implant failure problem using laboratory tests [7,9,10,11,13,20,23,27,29,31,32] and numerical approach [17]. Among the others, special attention should be paid to the studies done by Wierszycki [38] and Ilies [20]. Wierszycki proposed complete methodology and computational model for fatigue fracture estimation using strain based approach. The results were supported with clinical observations [39]. Ilies, on the other hand, proposed approach for fatigue estimation utilizing stresses and provided additional verification with laboratory tests. Another important work was done by Patterson and Johns [28] who presented the concept of fatigue resistance as a function of screw preload. These results prove the existence of the optimal value of screw preload in context of fatigue life of the implant screw. Finally, Genna [18,19] utilized shakedown analysis to examine lowcycle fatigue failure of dental implants. The results show that the 'worst' load case in context of fatigue fracture is characterized by pure transversal load or its strong domination on axial load.This conclusion was also confirmed for the prototype analyzed in the presented study by Szajek [35].Taking into account the results of the above mentioned studies, the complete designing methodology for improvement of two where K f is fatigue reduction factor (for fixture 1.25 -strongly roughed surface). Assuming consta...

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Reliability and failure modes of internal conical dental implant connections

Abstract: Reliability was not different between investigated ICI connections supporting maxillary incisor crowns. Failure modes were similar.

Cited by 49 publications

References 32 publications

Is the internal connection more efficient than external connection in mechanical, biological, and esthetical point of views? A systematic review

Is the internal connection more efficient than external connection in mechanical, biological, and esthetical point of views? A systematic review

Strain Gauge: study of strain distributions around three Morse taper prosthetic connections with offset positioning in machined and plastic copings under vertical load

experimental verification of the two component implant optimization results in context of fatigue life

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