Influence of implant/abutment joint designs on abutment screw loosening in a dental implant system

Kitagawa, T.; Tanimoto, Yasuhiro; Odaki, Misako; Nemoto, Kimiya; Aida, Masahiro

doi:10.1002/jbm.b.30328

Cited by 107 publications

(109 citation statements)

References 24 publications

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“…Even its geometry and shape should ensure the primary stability (which is impossible for the high values of the cortical bone), the study results underline how the fixture and the abutment of this model have values of the average Von Mises voltage significantly above the fatigue limit of the material. This justifies, in part, the decision of Brand Production of replacing this model after a few years since the introduction in the market with a new "D model" concerned with a neck design completely different shape (24)(25)(26).…”

Section: Figurementioning

confidence: 93%

FEM and VonMises analyses of different dental implant shapes for masticatory loading distribution

Cicciù

Bramanti

Cecchetti

et al. 2014

ORL

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SUMMARYThe rehabilitation of edentulous patients is today a challenge for the clinicians. The healthy of the hard and soft issue may be considered a fundamental element for having long-term results. The dental implant progresses about the predictable and safe results made this technique chosen from a large group of practitioners. However some problems related intraoperative and postoperative conditions may create discomfort on the patients and consequently to the clinician. The unfavourable results are often related to the bone tissue quality but sometime the dental implant shape and the prosthesis framework may undergo to technical difficulties. The purpose of this work is, through the use of appropriate FEM models, to analyse the effect of all these parameters in the construction of a prosthesis type "Toronto", evaluating all the surgical and prosthetic components in order to direct the choices made by the surgeon and to optimize the distribution of loads reducing the patient's discomfort and having a long term clinical success.

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Section: Figurementioning

confidence: 93%

FEM and VonMises analyses of different dental implant shapes for masticatory loading distribution

Cicciù

Bramanti

Cecchetti

et al. 2014

ORL

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show abstract

“…On the other hand, the preload values should not be too low in order to retain loose screws under repeated functional forces 16 . Eccentric and compressive forces are generated during chewing movements and influence the screw retention 3,8,[17][18][19][20] . The optimal preload values for the implant/abutment screw joint have not been fully identified and in single tooth implants this value is critical for screw joint stability 21 .…”

Section: Introductionmentioning

confidence: 99%

Screw loosening of different UCLA-type abutments after mechanical cycling

Junqueira¹,

Ribeiro²,

Faria³

et al. 2013

Braz. J. Oral Sci.

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Aim: To evaluate the loss of applied torque (detorque) values in cast and pre-machined abutments for external hex abutment/implant interface of single implant-supported prostheses subjected to mechanical cycling. Methods: Ten metal crowns were fabricated using two types of UCLA abutments: cast and pre-machined with metal base in NiCrTi alloy and tightened to regular external hex implants with a titanium alloy screw, with an insertion torque of 32 N.cm, measured with a digital torque gauge. Samples were embedded with autopolymerizing acrylic resin in a stainless steel cylindrical matrix, and positioned in an electromechanical machine. Dynamic oblique loading of 120 N was applied during 5 x 10 5 cycles. Then, each sample was removed from the resin and detorque values were measured using the same digital torque gauge. The difference of the initial (torque) and final (detorque) measurement was registered and the results were expressed as percentage of initial torque. The results of torque loss were expressed as percentage of the initial torque and subjected to statistical analysis by the Student's t-test (p<0.05) for comparisons between the test groups. Results: Statistical analysis demonstrated that mechanical cycling reduced the torque of abutments without significant difference between cast or pre-machined UCLA abutments (p=0.908). Conclusions: Within the limitations of this in vitro study, it may be concluded that the mechanical cycling, corresponding to one-year use, reduced the torque of the samples regardless if cast or pre-machined UCLA abutments were used.

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“…Increasing the torque beyond 30 N may be beneficial for the stability of the implant-abutment and reduce the risk of loose screws (16,17). Furthermore, increased screwing torque in Morse taper connections improves their sealing capacity, since no contamination was observed for abutments tightened with a 40 N torque (18).…”

Section: Discussionmentioning

confidence: 99%

Microbiological Seal of Two Types of Tapered Implant Connections

et al. 2016

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Tapered implant connections have gained wide popularity for being more resistant to fatigue and for promoting a better seal against bacterial infiltration than conventional connections. The aim of this study was to evaluate the bacterial seal at the implantabutment interface using two Morse taper implant models, by in vitro microbiological analysis. Eleven non-indexed and 11 indexed abutments were selected and connected to their respective implants with a 20 N torque, according to manufacturer's recommendation. Microbiological analysis was carried out using colonies of Escherichia coli transported directly from a culture dish to the prosthetic component. For control, one non-contaminated abutment-implant set from each group (negative control) and one contaminated implant with no abutment (positive control) were used. The specimens were immersed in BHI broth and maintained in an incubator at 37 °C for 14 days to assess the development of bacterial contamination. The results revealed that 36.4% (n=4) of the indexed components and 90.9% (n=10) of the non-indexed components allowed bacterial leakage, with significant difference between groups (p=0.0237). In conclusion, both tapered components failed to provide adequate sealing to bacterial leakage, although the indexed type components showed a superior seal compared with non-indexed components.

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Influence of implant/abutment joint designs on abutment screw loosening in a dental implant system

Cited by 107 publications

References 24 publications

FEM and VonMises analyses of different dental implant shapes for masticatory loading distribution

FEM and VonMises analyses of different dental implant shapes for masticatory loading distribution

Screw loosening of different UCLA-type abutments after mechanical cycling

Microbiological Seal of Two Types of Tapered Implant Connections

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