Factors Affecting Success and Survival Rates in Root Canal Retreatment

The aim of this study is to evaluate the effects of pre-treatment and procedural factors on survival and success rates in teeth that underwent non-surgical root canal retreatment at Trakya University, Faculty of Dentistry between 2015-2017.

Pre-treatment factors examined:

* Age * Gender * Presence and size of periapical lesion * Quality of root canal obturation

Factors examined during treatment:

* Type of restoration * Status of restoration at recall

The null hypothesis was that these factors have no effect on survival and success rate.

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Key information

Conditions

Root Canal Therapy Root Canal Retreatment

Age range

18 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Trakya University, Faculty of Dentistry

Edirne, Merkez, 22061, Turkey (Türkiye)

About this study

Patients with teeth that had undergone non-surgical recurrent root canal treatment at Trakya University, Faculty of Dentistry between 2015-2017 were invited for examination. Clinical and radiological examinations were performed on patients who agreed to participate in the study. No additional interventional procedures were performed. As a result of radiological and clinical examinations, whether the tooth was in the mouth, its clinical and radiological health, current clinical symptoms, etc. were determined.

Who can participate

Healthy volunteers accepted: Yes

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

Inclusion criteria

At least 18 years old at the time of treatment
Systemically healthy (ASA 1-2)
Acceptable obturation quality after treatment

Exclusion criteria

Precense of seperated instrument before or after treatment
Precense of perforation before or after treatment
Apical surgery before of before or after treatment
Immature root development
Two adjacent teeth which required root canal treatment or treatment
Pregnant women

Treatment and study plan

radiological and clinical examination

Diagnostic Test

Standard radiological (periapical radiography) and clinical (inspection, percussion, palpation tests etc.) examinations were performed.

Primary outcomes

Survival rate

Time frame: 78.47 ± 10.48 months after treatment

Survival Rate:

Survival was assessed whether the tooth was in the mouth or not. Survival was scored positive if the tooth was in the mouth, regardless of the health status of the tooth in the clinical and radiological examination at the follow-up appointment.
Success rate

Time frame: 78.47 +10.48 months

Success Rate:

Scored as successful or unsuccessful according to the following effects according to the clinical and radiological examinations; restoration status, health of the periapical tissues, presence of swelling and/or the sinus tract.

Success: The tooth had no clinical signs or symptoms, and the radiographs revealed complete resolution of periapical lesion Failure: The size of the periapical lesion was unchanged or increased or not completely healed, with or without clinical signs or symptoms

Sponsors and collaborators

Lead sponsor

Trakya University

Other

Registry information

Important dates

Study start: 2023
Primary completion: 2023
Study completion: 2024
First posted: Jun 5, 2025
Registry last updated: Jun 5, 2025

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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Completed