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Development of a new quantitative gas permeability method for dental implant-abutment connection tightness assessment.

Torres JH, Mechali M, Romieu O, Tramini P, Callas S, Cuisinier FJ, Levallois B - Biomed Eng Online (2011)

Bottom Line: The results show very significant differences between various sealing and screwing conditions.The remaining flow was lower after key screwing compared to hand screwing (p = 0.03) and remained different from the negative test (p = 0.0004).The method reproducibility was very good, with a coefficient of variation of 1.29%.

View Article: PubMed Central - HTML - PubMed

Affiliation: Université Montpellier, France. jh.torres@univ-montp1.fr

ABSTRACT

Background: Most dental implant systems are presently made of two pieces: the implant itself and the abutment. The connection tightness between those two pieces is a key point to prevent bacterial proliferation, tissue inflammation and bone loss. The leak has been previously estimated by microbial, color tracer and endotoxin percolation.

Methods: A new nitrogen flow technique was developed for implant-abutment connection leakage measurement, adapted from a recent, sensitive, reproducible and quantitative method used to assess endodontic sealing.

Results: The results show very significant differences between various sealing and screwing conditions. The remaining flow was lower after key screwing compared to hand screwing (p = 0.03) and remained different from the negative test (p = 0.0004). The method reproducibility was very good, with a coefficient of variation of 1.29%.

Conclusions: Therefore, the presented new gas flow method appears to be a simple and robust method to compare different implant systems. It allows successive measures without disconnecting the abutment from the implant and should in particular be used to assess the behavior of the connection before and after mechanical stress.

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Related in: MedlinePlus

Example of a recorded curve. Progressive decrease in pressure: initial drop is followed by a straight line (black dotted), the slope of which was determined by the operator.
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Figure 2: Example of a recorded curve. Progressive decrease in pressure: initial drop is followed by a straight line (black dotted), the slope of which was determined by the operator.

Mentions: Typical pressure curves showed an initial drop followed by a second regimen appearing as a straight line (Figure 2). This latter regimen is due to a pressure difference low enough, compared to atmospheric pressure: the nitrogen flow is not related any longer to pressure difference, but only to the importance of leakage, and obeys Knudsen's law [30]. The slope of the line was measured by an operator, and recorded. In order to assess the reproducibility of the slope determination by the operator, 10 curves were read twice: another operator drew lots 10 curves from among all the recorded curves. The first operator had to perform again slope determination for these curves, blindly. Reproducibility of the measurements was tested by a Kendall's coefficient of concordance.


Development of a new quantitative gas permeability method for dental implant-abutment connection tightness assessment.

Torres JH, Mechali M, Romieu O, Tramini P, Callas S, Cuisinier FJ, Levallois B - Biomed Eng Online (2011)

Example of a recorded curve. Progressive decrease in pressure: initial drop is followed by a straight line (black dotted), the slope of which was determined by the operator.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3094215&req=5

Figure 2: Example of a recorded curve. Progressive decrease in pressure: initial drop is followed by a straight line (black dotted), the slope of which was determined by the operator.
Mentions: Typical pressure curves showed an initial drop followed by a second regimen appearing as a straight line (Figure 2). This latter regimen is due to a pressure difference low enough, compared to atmospheric pressure: the nitrogen flow is not related any longer to pressure difference, but only to the importance of leakage, and obeys Knudsen's law [30]. The slope of the line was measured by an operator, and recorded. In order to assess the reproducibility of the slope determination by the operator, 10 curves were read twice: another operator drew lots 10 curves from among all the recorded curves. The first operator had to perform again slope determination for these curves, blindly. Reproducibility of the measurements was tested by a Kendall's coefficient of concordance.

Bottom Line: The results show very significant differences between various sealing and screwing conditions.The remaining flow was lower after key screwing compared to hand screwing (p = 0.03) and remained different from the negative test (p = 0.0004).The method reproducibility was very good, with a coefficient of variation of 1.29%.

View Article: PubMed Central - HTML - PubMed

Affiliation: Université Montpellier, France. jh.torres@univ-montp1.fr

ABSTRACT

Background: Most dental implant systems are presently made of two pieces: the implant itself and the abutment. The connection tightness between those two pieces is a key point to prevent bacterial proliferation, tissue inflammation and bone loss. The leak has been previously estimated by microbial, color tracer and endotoxin percolation.

Methods: A new nitrogen flow technique was developed for implant-abutment connection leakage measurement, adapted from a recent, sensitive, reproducible and quantitative method used to assess endodontic sealing.

Results: The results show very significant differences between various sealing and screwing conditions. The remaining flow was lower after key screwing compared to hand screwing (p = 0.03) and remained different from the negative test (p = 0.0004). The method reproducibility was very good, with a coefficient of variation of 1.29%.

Conclusions: Therefore, the presented new gas flow method appears to be a simple and robust method to compare different implant systems. It allows successive measures without disconnecting the abutment from the implant and should in particular be used to assess the behavior of the connection before and after mechanical stress.

Show MeSH
Related in: MedlinePlus