Related Experiment Video
Updated: May 11, 2026

04:04
Lateral Molar Approach-Driven Transoral Endoscopic Procedure for Benign Infratemporal Fossa Tumor Resection
Published on: August 15, 2025
Extensive idiopathic external root resorption in first maxillary molar: a case report.
Behnam Bolhari1, Naghmeh Meraji, Ali Nosrat
1Department of Endodontics, Dental School, Tehran University of Medical Sciences, Tehran, Iran.
Iranian Endodontic Journal
|May 30, 2013
Summary
Idiopathic external root resorption, a rare dental condition, severely affected a patient's maxillary first molar despite normal tooth mobility. This case highlights the challenges in diagnosing and managing unexplained root resorption.
Area of Science:
- Dentistry
- Oral Pathology
Background:
- External root resorption (ERR) is a complex dental issue with multiple known causes.
- Idiopathic external root resorption (IER) refers to cases where no specific cause can be identified.
Observation:
- A case study of an 18-year-old patient with extensive IER in a maxillary first molar is presented.
- The condition presented with irreversible pulpitis, confirmed by vitality tests.
- Conventional radiography and Cone Beam Computed Tomography (CBCT) were used for diagnosis.
Findings:
- Despite severe root structure loss, the affected tooth exhibited no abnormal mobility.
- The precise etiology for the idiopathic external root resorption remained undetermined.
- The tooth demonstrated vitality but had irreversible pulpitis.
Implications:
- This case underscores the diagnostic challenges associated with IER, particularly when typical signs like mobility are absent.
- Severe root resorption, even without mobility, indicates a poor prognosis.
- Extraction and subsequent dental implant replacement were deemed the most viable treatment option.
Related Concept Videos
Tooth Anatomy
The human tooth enables us to eat a variety of foods, speak clearly, and even aid in shaping our faces. Teeth are composed of various elements that work together. Here's a detailed look at the anatomy of a human tooth.
The Crown, Neck, and Root
The visible part of the tooth is referred to as the crown. It's covered by enamel, the hardest substance in the human body. The crown is uniquely shaped for each type of tooth, allowing for different functions such as cutting, tearing, or grinding food.
The Crown, Neck, and Root
The visible part of the tooth is referred to as the crown. It's covered by enamel, the hardest substance in the human body. The crown is uniquely shaped for each type of tooth, allowing for different functions such as cutting, tearing, or grinding food.
Teeth
The formation of teeth, also known as odontogenesis, is a complex process that begins in utero, around the sixth week of embryonic development. There are three stages to this process: the bud stage, the cap stage, and the bell stage.
In the bud stage, the tooth germ (an aggregation of cells) starts to form in the developing jawbone. During the cap stage, the tooth germ differentiates into enamel organ, dental papilla, and dental sac, which will later develop into the tooth's enamel, dentin and...
In the bud stage, the tooth germ (an aggregation of cells) starts to form in the developing jawbone. During the cap stage, the tooth germ differentiates into enamel organ, dental papilla, and dental sac, which will later develop into the tooth's enamel, dentin and...