None
Conditions
Interventions
14-18 years old group:None
=65 years old group:None
Sponsors
West China Hospital of Stomatology, Sichuan University
Eligibility
Sex/Gender
All
Inclusion criteria
Inclusion criteria: 1.There are CBCT images that can clearly show the complete structure of the mandibular first permanent molar; 2.The first mandibular permanent molar apical foramen is basically closed; 3.The mandibular first permanent molar has not received root canal treatment.
Exclusion criteria
Exclusion criteria: 1.Abnormal tooth development in the mandibular first permanent molar (tooth depression, enamel hypoplasia, dentin hypoplasia, enamel or dentin hypoplasia, etc.); 2.The presence of internal and/or external absorption of the mandibular first permanent molar, as well as structural loss that alters normal tooth anatomy; 3.Presence of metal fillers or orthodontic brackets in X-ray and/or tomographic images of the mandibular first permanent molar region; 4.The first permanent molar of the lower jaw has fillings that change the normal anatomical structure of the teeth or dental diseases (resin filling, viable pulp preservation, etc.).
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Root canal number;Buccolingual diameter of root canal;Proximal distal diameter of root canal; | — |
Countries
China
Contacts
Public ContactRan Cheng
West China Hospital of Stomatology, Sichuan University
Outcome results
None listed