Microleakage at Different Implant-Abutment Connections Under Unloaded and Loaded Conditions

Silva-Neto, João Paulo da; Prudente, Marcel Santana; Dantas, Talita Souza; Senna, Plínio Mendes; Ribeiro, Ricardo Faria; Neves, Flávio Domingues das

doi:10.1097/id.0000000000000568

Cited by 15 publications

(20 citation statements)

References 18 publications

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“…27 Previous published studies also concluded that the conical connection had better resistance than nonconical ones against both mechanical deformation and bacterial invasion. 15,28,29 These rate between the two types of connection studied here was found clinically. 30 It appears that the size of the micro-gap does not relate to crestal bone loss either.…”

Section: Evaluation Based On Micro-ct Imagessupporting

confidence: 62%

“…27 Previous published studies also concluded that the conical connection had better resistance than nonconical ones against both mechanical deformation and bacterial invasion. 15,28,29 These these previous studies. However, there is no clear correlation between the size of the interfacial gap and the clinical performance of an implant.…”

Section: Discussionmentioning

confidence: 52%

“…25 As a previous study suggested, micro-leakage also increased over time as the number of loading cycles increased. 28 Another limitation of this study was that the volume of leakage was not quantified in the experiments. Some researchers measured the concentration of the penetrant, such as absorbance of the dye or bacterial count, to evaluate the volume of leakage.…”

Section: Discussionmentioning

confidence: 99%

“…Some researchers measured the concentration of the penetrant, such as absorbance of the dye or bacterial count, to evaluate the volume of leakage. 15,28 However, the concentration of silver nitrate inside the implant was highly dependent on the drying time and the size of gap opening after loading. Using the data from micro-CT to quantify the volume of silver nitrate is possible but isolating the silver nitrate is very sensitive to the choice of the grayvalue threshold.…”

Section: Discussionmentioning

confidence: 99%

“…28 Another limitation of this study was that the volume of leakage was not quantified in the experiments. 15,28 However, the concentration of silver nitrate inside the implant was highly dependent on the drying time and the size of gap opening after loading. 15,28 However, the concentration of silver nitrate inside the implant was highly dependent on the drying time and the size of gap opening after loading.…”

Section: Evaluation Based On Micro-ct Imagesmentioning

confidence: 99%

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Contact analysis of gap formation at dental implant‐abutment interface under oblique loading: A numerical‐experimental study

Fok

Aparicio

et al. 2019

Clin Implant Dent Rel Res

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Purpose: To develop numerical and experimental methods for investigating the formation of micro-gaps and the change in contact area at the implant-abutment interface of two different connector designs under oblique cyclic loading.Materials and Methods: Samples (n = 10 per group) of two-piece implant systems with the conical connection (group A) and the external hexagonal connection (group B) were subjected to cyclic loading with increasing load amplitudes up to 220 N.After loading, the samples were scanned using micro-CT, with silver nitrate as a highcontrast penetrant, and the level of leakage was assessed using a discrete scoring system. Three-dimensional finite element (FE) analyses of the two implant systems were also conducted to reveal the micro-gap formation process, especially bridging of the internal abutment screw space. The experimental and numerical results for the bridging load were then compared.Results: 90% of the samples in group A showed leakage into the internal implant space at a load of around 100 N; while over 80% of those in group B did so at a load of around 40 N. This agreed with the FE analysis, which showed bridging of the internal implant space at loads similar to those measured for the two implant systems.Residual gaps of less than 1.49 μm were predicted for group A only after unloading. Conclusions:The FE-predicted loads for bridging agreed well with those found experimentally for leakage to occur. The conical connection showed more resistance against formation of micro-gaps at the implant-abutment interface than the external hexagonal connection. Although the minimum load required to bridge the internal implant space was within the range of human biting force, the relation between bacterial invasion and micro-gaps needs further research. K E Y W O R D S finite element analysis, implant connection design, implant-abutment micro-gap, microcomputed tomography

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Section: Evaluation Based On Micro-ct Imagessupporting

confidence: 62%

“…27 Previous published studies also concluded that the conical connection had better resistance than nonconical ones against both mechanical deformation and bacterial invasion. 15,28,29 These these previous studies. However, there is no clear correlation between the size of the interfacial gap and the clinical performance of an implant.…”

Section: Discussionmentioning

confidence: 52%