Understanding root and canal structures in teenagers: a study on extracted mandibular premolars in Damascus

An epidemiological study of root number, length, and canal morphology in extracted mandibular premolars from adolescent patients in Damascus

Status

Active, not recruiting

Phases

Unknown

Study type

Observational

Source

ISRCTN

Registry ID

ISRCTN93024803

Enrollment

250

Registered

2025-03-18

Start date

2023-03-30

Completion date

Unknown

Last updated

2026-05-19

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Root number, length, and root canal anatomy of extracted mandibular premolars Oral Health

Interventions

The sample consisted of 250 recently extracted first and second MPs during orthodontic treatment of adolescents aged 12–15 years from Damascus at the Pediatric Dentistry, Orthodontics, and Oral and Ma

Changzhou Sifary Medical Technology Co., Ltd., Changzhou City, Jiangsu Province, China) with the following settings: exposure time of 0.08 seconds, 65 kVp, and 2.5 mA. The PRU was positioned perpendic

Vatech, Gyeonggi-do, Korea) in both radiographs.

Eligibility

Sex/Gender

All

Age

12 Months to 15 Months

Inclusion criteria

Inclusion criteria: 1. Adolescents in Damascus 2. Intact mandibular premolars

Exclusion criteria

Exclusion criteria: 1. Syndromes patients 2. Premolars fractured during the extraction process

Design outcomes

Primary

Measure	Time frame
1. Premolar root numbers counted immediately after premolar extraction 2. Premolar length measured in mm immediately after premolar extraction 3. Root canal morphology assessed immediately after premolar radiographing. Vertucci’s classification was adopted to assess the canal morphology in both radiographs in each premolar: Type I (1-1): A single canal from the pulp chamber to the apex. Type II (2-1): Two separate canals leave the chamber and merge near the apex to form a single canal. Type III (1-2-1): A single canal leaving the pulp chamber, dividing into two, then rejoining to form one canal. Type IV (2-2): Two separate canals from the pulp chamber to the apex. Type V (1-2): A single canal leaving the chamber and dividing into two separate canals at the apex. Type VI (2-1-2): Two separate canals leaving the pulp chamber, merging in the middle of the root, and dividing again into two short, separate canals at the apex. Type VII (1-2-1-2): A single canal dividing, merging, and then separating into two short, separate canals at the apex. Type VIII (3-3): Three separate canals in one root from the pulp chamber to the apex.	—

Measure

Time frame

1. Premolar root numbers counted immediately after premolar extraction 2. Premolar length measured in mm immediately after premolar extraction 3. Root canal morphology assessed immediately after premolar radiographing. Vertucci’s classification was adopted to assess the canal morphology in both radiographs in each premolar: Type I (1-1): A single canal from the pulp chamber to the apex. Type II (2-1): Two separate canals leave the chamber and merge near the apex to form a single canal. Type III (1-2-1): A single canal leaving the pulp chamber, dividing into two, then rejoining to form one canal. Type IV (2-2): Two separate canals from the pulp chamber to the apex. Type V (1-2): A single canal leaving the chamber and dividing into two separate canals at the apex. Type VI (2-1-2): Two separate canals leaving the pulp chamber, merging in the middle of the root, and dividing again into two short, separate canals at the apex. Type VII (1-2-1-2): A single canal dividing, merging, and then separating into two short, separate canals at the apex. Type VIII (3-3): Three separate canals in one root from the pulp chamber to the apex.

—

Secondary

Measure	Time frame
The gender effects on the root number (one, two, three or more roots), their length (in mm), and the canal morphology of mandibular premolars (Vertucci classification), assessed statistically after analyzing the data	—

Countries

Syria

Contacts

Public ContactYasser Alsayed Tolibah

yasser94.tolibah@damascusuniversity.edu.sy+963 (0)988812044

Outcome results

None listed

Source: ISRCTN (via WHO ICTRP) · Data processed: May 22, 2026