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OpenTrials
Completed

NCT Number: NCT06441058

Retrospective Database Study: Influence of Post-endodontic Restoration Placement on Survival of Root Canal-treated Teeth

The aim of this study is to assess the influence (i.e. type and timing) of post-endodontic restorations on the survival of root canal-treated teeth and to determine the influence of patient-, tooth-, treatment-, and restoration-specific parameters on longevity.

Patients who received a root-canal treatment between 1998 and 1999 with subsequent placement of an indirect restoration (e.g. crown, partial crown) will be retrospectively analyzed. Patient-, tooth-, treatment-, and restoration-specific parameters will be obtained from digital and paper-based dental records.

Survival and success of the root-canal treatments will be assessed using Kaplan-Meier statistics. Mean annual failure rates (mAFR) and median survival time will be calculated (Kaplan-Meier statistics). Potential predictive factors will be tested using log-rank tests and multi-variate Cox-regression analysis.

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Key information

Conditions

Root Canal Treatment

Sex eligibility

All sexes

Study type

Observational

Primary location

University Medical Center Göttingen, Dept. of Preventive Dentistry, Periodontology and Cariology

Göttingen, Lower Saxony, 37075, Germany

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Patients who received a root-canal treatment followed by the placement of an indirect post-endodontic restoration (e.g. partial crowns, crowns) within the Department of Preventive Dentistry, Periodontology and Cariology between 1998 and 1999.

Exclusion criteria

  • None.

Treatment and study plan

No patient treatment is associated with the study

Other

No patient treatment is associated with the study.

Primary outcomes

  1. Success of endodontic treatment

    Time frame: 1998-2023

    Success is defined as the time-interval without a subsequent endodontic re-intervention or extraction of the tooth.

Secondary outcomes

  1. Survival of the tooth

    Time frame: 1998-2023

    Survival of the tooth is defined as the time-interval without extraction of the tooth.

Sponsors and collaborators

Lead sponsor

University of Göttingen

Other

Registry information

Official study title

Influence of the Timing of Post-endodontic Restoration Placement on the Survival of Root Canal-treated Teeth

Important dates

Study start
2024
Primary completion
2025
Study completion
2025
First posted
Jun 4, 2024
Registry last updated
Jan 27, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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