手法を比較

	根管長決定	バイトウィング撮影法
分野	歯学	歯学
系統	Process / pipeline	Process / pipeline
提唱年	1920s (radiography); 1960s (electronic)	1913 (original technique)
提唱者	Multiple innovators (radiographic and electronic methods)	Multiple innovators, formalized in 20th century
種類	Diagnostic and measurement procedure	Radiographic examination
原典	Ingle, J. I., Bakland, L. K., & Baumgartner, J. C. (2008). Endodontics (6th ed.). BC Decker.	Ludlow, J. B., Davies-Ludlow, L. E., Brooks, S. L., & Howerton, W. B. (2006). Dosimetry of 3 intraoral digital imaging systems. Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology and Endodontology, 101(2), 226-234.
別名	working length measurement, WL determination, electronic apical locator, periapical radiography	bitewing X-ray, bitewings, posterior radiography
関連	3	4
概要	Root canal length determination (working length) is a critical procedural step in endodontic therapy that establishes the precise depth to which instrumentation, irrigation, and obturation should extend within the root canal system. Modern approaches combine electronic apical locators (EAL) with radiographic verification to accurately locate the apical foramen and establish the working length. Accurate working length determination is essential for successful endodontic treatment, preventing under-instrumentation (leaving infected material) and over-instrumentation (causing periapical inflammation).	Bitewing radiography is a standard intraoral radiographic technique that captures the coronal portions of both maxillary and mandibular teeth in a single image, with the patient biting on a film holder or digital sensor. Introduced in the early 20th century and formalized as a diagnostic standard, bitewing radiographs are the primary image type for detecting approximal caries, monitoring alveolar bone level for periodontal disease assessment, and evaluating dental restorations and radiographic density changes. Digital bitewings have reduced radiation exposure and improved image quality and archiving.