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Implant Disease Risk Assessment (IDRA)

15.10.2026
History of Perio
BOP% = 0
PD≥5mm
BL/Age
Susceptibility
SPT
RM - Bone
Prosthesis
Overall Risk Rating: Low

Notices:

  1. Please note that this website does not record any patient identifiable data (eg Name).
  2. This IDRA risk assessment tool will require validation through retrospective or prospective studies in multiple private practice and University settings.
  3. This is to guide considerations about care and should be used in conjunction with comprehensive treatment planning.
  4. No warranty for the sites accuracy is accepted.
  5. Download the reference paper:
    Lisa J.A. Heitz-Mayfield, Fritz Heitz, Niklaus P. Lang (2020)
    Implant Disease Risk Assessment IDRA - a tool for preventing peri-implant disease.
Age (years)
Number of teeth
(1 - 32)
Probing sites per tooth
Number of implants
Probing sites per implant
Number of BOP-pos. sites
of 192
History of periodontitis
Periodontitis susceptibility (according to the 2017 classification)
Number of sites with PD≥5mm (tooth and implant site)
% Alveolar bone loss (BL) (estimated in % or 10% per 1mm at the worst site)
% BL/Age: 0.00
Supportive periodontal therapy (SPT)
Restorative margin (RM) to bone
Implant prosthesis
www.perio-tools.com/idra Copyright © 2026 by www.perio-tools.com

Instructions for use

Age (years)

Enter the age of the patient.

Number of teeth / Number of implants

Enter the number of teeth and implants for the calculation of BOP% (1-32, wisdom teeth can be included).

Number of BOP-pos. sites

Enter the number of BOP-positive sites.

Number of sites with PD≥5mm (tooth and implant site)

Enter the number of sites with periodontal probing depths of 5mm or more.

% Alveolar bone loss (BL) (estimated in % or 10% per 1mm at the worst site)

Enter the amount of alveolar bone loss at the most advanced site in increments of 10%.

History of periodontitis

Select "Yes" if the patient has a history of periodontitis.

Stage / Grade

Select the Periodontitis Stage and Grade according to the 2018 classification.

Supportive periodontal therapy (SPT)

Select the frequency of supportive periodontal therapy.

Restorative margin (RM) to bone

Select the distance between the restorative margin and the bone level.

Implant prosthesis

Select the type of prosthesis used.

Reference

Lisa J.A. Heitz‐Mayfield Fritz Heitz Niklaus P. Lang (2020) Implant Disease Risk Assessment IDRA ‐ a tool for preventing peri‐implant disease. https://doi.org/10.1111/clr.13585.

Download Article

www.perio-tools.com/idra

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Impressum

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Copyright © 2026 by www.perio-tools.com

Contact

We are looking forward to receiving any feedback or suggestions to further optimize our online implant disease risk assessment tool.

Programming & Design

Prof. Dr. med. dent. Christoph A. Ramseier, MAS
Associate Professor, University of Bern, Switzerland
Periodontist SSP, EFP
Master of Advanced Studies (MAS) in Periodontology

E-mail: christoph_ramseier@bluewin.ch

Illustrations

Bernadette Rawyler, University of Bern

Christian A. Wolf, Dr. med. dent., Dr. med.
Christoph A. Ramseier

Citation

Please cite this website as follows:
Heitz-Mayfield LJA, Heitz F, Lang NP. Implant Disease Risk Assessment IDRA - a tool for preventing peri-implant disease. www.perio-tools.com/idra/. 2026.

For the scientific background of this website, please cite:
Heitz-Mayfield LJA, Heitz F, Lang NP. Implant Disease Risk Assessment IDRA - a tool for preventing peri-implant disease. Clin Oral Implants Res. 2020 Jul;31(7):621-628. doi: 10.1111/clr.13585.

Acknowledgements

We would like to thank our collaborators and the University of Bern for their support.

Bern, Switzerland, 2026