Marginal Adaptation and Microbial Leakage at Conometric Prosthetic Connections for Implant-Supported Single Crowns: An In Vitro Investigation
Encouraging clinical results were reported on a novel cone-in-cone coupling for the fixation of dental implant-supported crowns (Acuris, Dentsply Sirona Implants, Mölndal, Sweden). However, the presence or absence of a microgap and a potential bacterial leakage at the conometric joint has not yet be...
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| Language: | English |
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MDPI AG
2021-01-01
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| Series: | International Journal of Molecular Sciences |
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| Online Access: | https://www.mdpi.com/1422-0067/22/2/881 |
| _version_ | 1797410622145560576 |
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| author | Peter Gehrke Philip Hartjen Ralf Smeets Martin Gosau Ulrike Peters Thomas Beikler Carsten Fischer Carolin Stolzer Jürgen Geis-Gerstorfer Paul Weigl Sogand Schäfer |
| author_facet | Peter Gehrke Philip Hartjen Ralf Smeets Martin Gosau Ulrike Peters Thomas Beikler Carsten Fischer Carolin Stolzer Jürgen Geis-Gerstorfer Paul Weigl Sogand Schäfer |
| author_sort | Peter Gehrke |
| collection | DOAJ |
| description | Encouraging clinical results were reported on a novel cone-in-cone coupling for the fixation of dental implant-supported crowns (Acuris, Dentsply Sirona Implants, Mölndal, Sweden). However, the presence or absence of a microgap and a potential bacterial leakage at the conometric joint has not yet been investigated. A misfit and a resulting gap between the conometric components could potentially serve as a bacterial reservoir that promotes plaque formation, which in turn may lead to inflammation of the peri-implant tissues. Thus, a two-fold study set-up was designed in order to evaluate the bidirectional translocation of bacteria along conometrically seated single crowns. On conometric abutments filled with a culture suspension of anaerobic bacteria, the corresponding titanium nitride-coated (TiN) caps were fixed by friction. Each system was sterilized and immersed in culture medium to provide an optimal environment for microbial growth. Positive and negative controls were prepared. Specimens were stored in an anaerobic workstation, and total and viable bacterial counts were determined. Every 48 h, samples were taken from the reaction tubes to inoculate blood agar plates and to isolate bacterial DNA for quantification using qrt-PCR. In addition, one Acuris test system was subjected to scanning electron microscopy (SEM) to evaluate the precision of fit of the conometric coupling and marginal crown opening. Throughout the observational period of one week, blood agar plates of the specimens showed no viable bacterial growth. qrt-PCR, likewise, yielded a result approaching zero with an amount of about 0.53 × 10<sup>−4</sup> µg/mL DNA. While the luting gap/marginal opening between the TiN-cap and the ceramic crown was within the clinically acceptable range, the SEM analysis failed to identify a measurable microgap at the cone-in-cone junction. Within the limits of the in-vitro study it can be concluded that the Acuris conometric interface does not allow for bacterial translocation under non-dynamic loading conditions. |
| first_indexed | 2024-03-09T04:32:51Z |
| format | Article |
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| institution | Directory Open Access Journal |
| issn | 1661-6596 1422-0067 |
| language | English |
| last_indexed | 2024-03-09T04:32:51Z |
| publishDate | 2021-01-01 |
| publisher | MDPI AG |
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| series | International Journal of Molecular Sciences |
| spelling | doaj.art-5c70b68810eb4ceca78a0b90e32fea152023-12-03T13:33:41ZengMDPI AGInternational Journal of Molecular Sciences1661-65961422-00672021-01-0122288110.3390/ijms22020881Marginal Adaptation and Microbial Leakage at Conometric Prosthetic Connections for Implant-Supported Single Crowns: An In Vitro InvestigationPeter Gehrke0Philip Hartjen1Ralf Smeets2Martin Gosau3Ulrike Peters4Thomas Beikler5Carsten Fischer6Carolin Stolzer7Jürgen Geis-Gerstorfer8Paul Weigl9Sogand Schäfer10Department of Postgraduate Education, Center for Dentistry and Oral Medicine (Carolinum), University Hospital, Goethe University Frankfurt, 60323 Frankfurt am Main, GermanyDepartment of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, 20251 Hamburg, GermanyDepartment of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, 20251 Hamburg, GermanyDepartment of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, 20251 Hamburg, GermanyDepartment of Periodontics, Preventive and Restorative Dentistry, University Medical Center Hamburg-Eppendorf, 20251 Hamburg, GermanyDepartment of Periodontics, Preventive and Restorative Dentistry, University Medical Center Hamburg-Eppendorf, 20251 Hamburg, GermanyDental Laboratory, Sirius Ceramics, 60528 Frankfurt am Main, GermanyDepartment of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, 20251 Hamburg, GermanySection Medical Materials Science and Technology, University Hospital Tuebingen, 72076 Tuebingen, GermanyDepartment of Prosthodontics and Head of Department of Postgraduate Education, Center for Dentistry and Oral Medicine (Carolinum), University Hospital, Goethe University Frankfurt, 60528 Frankfurt am Main, GermanyDepartment of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, 20251 Hamburg, GermanyEncouraging clinical results were reported on a novel cone-in-cone coupling for the fixation of dental implant-supported crowns (Acuris, Dentsply Sirona Implants, Mölndal, Sweden). However, the presence or absence of a microgap and a potential bacterial leakage at the conometric joint has not yet been investigated. A misfit and a resulting gap between the conometric components could potentially serve as a bacterial reservoir that promotes plaque formation, which in turn may lead to inflammation of the peri-implant tissues. Thus, a two-fold study set-up was designed in order to evaluate the bidirectional translocation of bacteria along conometrically seated single crowns. On conometric abutments filled with a culture suspension of anaerobic bacteria, the corresponding titanium nitride-coated (TiN) caps were fixed by friction. Each system was sterilized and immersed in culture medium to provide an optimal environment for microbial growth. Positive and negative controls were prepared. Specimens were stored in an anaerobic workstation, and total and viable bacterial counts were determined. Every 48 h, samples were taken from the reaction tubes to inoculate blood agar plates and to isolate bacterial DNA for quantification using qrt-PCR. In addition, one Acuris test system was subjected to scanning electron microscopy (SEM) to evaluate the precision of fit of the conometric coupling and marginal crown opening. Throughout the observational period of one week, blood agar plates of the specimens showed no viable bacterial growth. qrt-PCR, likewise, yielded a result approaching zero with an amount of about 0.53 × 10<sup>−4</sup> µg/mL DNA. While the luting gap/marginal opening between the TiN-cap and the ceramic crown was within the clinically acceptable range, the SEM analysis failed to identify a measurable microgap at the cone-in-cone junction. Within the limits of the in-vitro study it can be concluded that the Acuris conometric interface does not allow for bacterial translocation under non-dynamic loading conditions.https://www.mdpi.com/1422-0067/22/2/881conometric connectionconical couplingAcurisbacterial leakagemarginal fitCAD/CAM crown |
| spellingShingle | Peter Gehrke Philip Hartjen Ralf Smeets Martin Gosau Ulrike Peters Thomas Beikler Carsten Fischer Carolin Stolzer Jürgen Geis-Gerstorfer Paul Weigl Sogand Schäfer Marginal Adaptation and Microbial Leakage at Conometric Prosthetic Connections for Implant-Supported Single Crowns: An In Vitro Investigation International Journal of Molecular Sciences conometric connection conical coupling Acuris bacterial leakage marginal fit CAD/CAM crown |
| title | Marginal Adaptation and Microbial Leakage at Conometric Prosthetic Connections for Implant-Supported Single Crowns: An In Vitro Investigation |
| title_full | Marginal Adaptation and Microbial Leakage at Conometric Prosthetic Connections for Implant-Supported Single Crowns: An In Vitro Investigation |
| title_fullStr | Marginal Adaptation and Microbial Leakage at Conometric Prosthetic Connections for Implant-Supported Single Crowns: An In Vitro Investigation |
| title_full_unstemmed | Marginal Adaptation and Microbial Leakage at Conometric Prosthetic Connections for Implant-Supported Single Crowns: An In Vitro Investigation |
| title_short | Marginal Adaptation and Microbial Leakage at Conometric Prosthetic Connections for Implant-Supported Single Crowns: An In Vitro Investigation |
| title_sort | marginal adaptation and microbial leakage at conometric prosthetic connections for implant supported single crowns an in vitro investigation |
| topic | conometric connection conical coupling Acuris bacterial leakage marginal fit CAD/CAM crown |
| url | https://www.mdpi.com/1422-0067/22/2/881 |
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