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Periodontal response to two different subgingival restorative margin designs: a 12-month randomized clinical trial

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Abstract

Objectives

Subgingival margin placement is sometimes required due to different reasons and is often associated with adverse periodontal reactions. The purpose of this study was to determine if a single restoration with subgingival margin on a tooth, in the maxillary anterior zone, would affect its periodontal soft tissue parameters, and whether or not a deep chamfer preparation has a different influence in the periodontium when compared to a feather edge preparation.

Material and methods

Plaque and gingival indexes, periodontal probing depth, bleeding on probing, and patient’s biotype were registered. One hundred six teeth were prepared with a deep chamfer, while 94 were prepared with a feather edge finishing line. Twelve months after the restoration delivery, the same parameters were evaluated. Repeated measure one-way analysis of variance (ANOVA) (α = 0.05) was used.

Results

A statistically significant difference between the baseline and the 12-month follow-up is present in regard to plaque index, gingival index, and periodontal probing depth, but no statistically significant difference between chamfer and feather edge finishing lines. There is a statistically significant difference between the baseline and the 12-month follow-up in regard to bleeding on probing. Feather edge preparation presents significantly more bleeding on probing and less gingival recession than the chamfer.

Conclusions

Subgingival margins do influence the periodontal soft tissue response. Statistically significant difference exists between feather edge and chamfer finishing lines in regard to bleeding on probing and gingival recession.

Clinical relevance

Subgingival margins should be carefully selected, especially when feather edge finishing line is utilized.

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Acknowledgments

The authors would like to thank Dimitris Kugiumtzis, PhD, Associate Professor of Statistics, School of Engineering, Aristotle University, Thessaloniki, Greece, for his guidance and invaluable assistance in the preparation of this manuscript.

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Authors and Affiliations

  1. Department of Prosthodontics, Tufts University School of Dental Medicine, Boston, MA, USA

    Gianluca Paniz & Konstantinos Michalakis

  2. Department of Prosthodontics, School of Dentistry, University of Padova, Padova, Italy

    Gianluca Paniz

  3. Department of Periodontology, Universitat Internacional de Catalunya, c/ Josep Trueta s/n, Barcelona, Spain

    Jose Nart

  4. Department of Periodontology, Harvard University School of Dental Medicine, Boston, MA, USA

    Luca Gobbato

  5. Department of Periodontology, School of Dentistry, University of Padova, Padova, Italy

    Luca Gobbato

  6. Private Practice limited to Periodontics, Verona, Italy

    Andrea Chierico

  7. Department of Prosthodontics, School of Dentistry, S. Paul Hospital, University of Milan, Milan, Italy

    Diego Lops

  8. Department of Prosthodontics, Faculty of Health Sciences, Aristotle University School of Dentistry, Thessaloniki, Greece

    Konstantinos Michalakis

Authors
  1. Gianluca Paniz
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  2. Jose Nart
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  3. Luca Gobbato
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  4. Andrea Chierico
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  5. Diego Lops
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  6. Konstantinos Michalakis
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Corresponding author

Correspondence to Jose Nart.

Ethics declarations

This prospective study was performed in accordance with the guidelines of the 1964 Declaration of Helsinki, and the research protocol was approved by the Ethics Committee of the University of Padova (2737P/2013), prior to patient enrollment. Additionally, this clinical study was registered at the US National Institutes of Health Clinical Trials Registry (NCT02276586). Patients were notified that their data would be collected and used for a statistical analysis. A signed informed consent was obtained from all patients enrolled in this study. This article does not contain any studies with animal performed by any of the authors.

Conflict of interest

The authors declare that they have no competing interests.

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Paniz, G., Nart, J., Gobbato, L. et al. Periodontal response to two different subgingival restorative margin designs: a 12-month randomized clinical trial. Clin Oral Invest 20, 1243–1252 (2016). https://doi.org/10.1007/s00784-015-1616-z

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