Dimensional Tolerances and Assembly Accuracy of Dental Implants and Machined Versus Cast‐On Abutments

Malaguti, Giuliano; Denti, Lucia; Bassoli, Elena; Franchi, Irene; Bortolini, Sergio; Gatto, Andrea

doi:10.1111/j.1708-8208.2009.00189.x

Cited by 20 publications

(22 citation statements)

References 8 publications

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“…The applied torque and the masticatory load could generate micromovements, deforming the implant hexagon. Studies have indicated a direct correlation between implant-abutment rotational misfit and screw loosening [9][10][11][12] . Preload is the tension on a screw generated when a torqueing force is applied to the screw head.…”

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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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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show abstract

“…In this study, the implants were inserted in self-curing acrylic resin rigid plates in pattern way using liners. It enables a specimen evaluation with appropriately fixed on the acrylic in order to decease external variables that could interfere on the results, as bone type and quality, implant thread macro and micro geometry and eve implant surface treatment [25][26][27][28][29][30] . .…”

Section: Discussionmentioning

confidence: 99%

“…In this study, despite the torque application have caused dimensional changes on the hexagon surface, most of torques applied did not showed significant change. However, it is known that when there is significant change, pillar implant adaptation can be directly affected and some studies have showed a close relation between p r o s t h e s i s m i s m a t c h a n d b o l t s loosening [25][26][27][28][29] .…”

Section: Discussionmentioning

confidence: 99%

Evaluaton of hexagon deformation of dental implant regarding to the insertion force

Molina¹,

Neto²,

Oliveira³

et al. 2017

J. res. dent.

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The aim of this study is to evaluate hexagon deformation of dental implant regarding to the insertion force, verifying the external hexagon platforms before and after each torque performed. Thereunto, 25 implants were selected and divided into 5 groups with 5 implants each one; every group received different torque 10N, 20N, 30N, 40N and 100N. A Surgical torque wrench was used, with the implant installation key, what established the insertion force for each group. The platform measurements were carried out before and after apply the torque by analyses of images acquired through implant platforms. We conclude, by this study methodology, 100N forces were able to cause changes on hexagon dimensions; however, it did not damage the prosthesis platform adaptation.

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“…There are very few papers exploring thread milling forces on titanium alloys although it is been widely used for medical and dental implants [Malaguti et al, 2011], [Lopez-Heredia et al, 2008] e [Yamazoe, 2010].…”

Section: Introductionmentioning

confidence: 99%

Analytical and experimental investigations on thread milling forces in titanium alloy

Araujo

Fromentin

Poulachon

2013

International Journal of Machine Tools and Manufacture

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. AbstractThis study deals with thread milling process that it is considered a complex machining technique due to its elaborated tool geometry and its tridimensional tool trajectory. It is needed advanced research on the threading process which has not been much studied. Previous studies focused on geometrical modeling or mechanistic modeling of the thread milling process. There is a need of a better understanding of parameter effects to accomplish a model that tends to be more realistic and includes local parameters. This investigation does the analysis of thread milling parameters: thread geometry, cutting conditions and tool angles, which can be applied to the tool optimization. The cutting forces and torque were measured and representative values of its variation were calculated and analyzed as response of the experiments. A geometrical analysis and an analysis of variance were employed for determining the influence of the factors and based on the results, it is proposed a physical understanding of the process.

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Dimensional Tolerances and Assembly Accuracy of Dental Implants and Machined Versus Cast‐On Abutments

Abstract: An original measuring protocol was developed, independent of parts assembly and based on ITs. An objective dimensional characterization of prosthetic components and assemblies has been achieved, which is the basis for their reliability in clinical applications.

Cited by 20 publications

References 8 publications

Screw loosening of different UCLA-type abutments after mechanical cycling

Screw loosening of different UCLA-type abutments after mechanical cycling

Evaluaton of hexagon deformation of dental implant regarding to the insertion force

Analytical and experimental investigations on thread milling forces in titanium alloy

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