Sridhara Arvind, Konde Sapna, Noojadi Sunil Raj, Kumar Narayan Chandra, Belludi Ashwitha C
Department of Pedodontics and Preventive Dentistry, Sri Siddhartha Dental College, Tumakuru, Karnataka, India.
Department of Pedodontics and Preventive Dentistry, AECS Maaruti College of Dental Sciences and Research Centre, Bengaluru, Karnataka, India.
Int J Clin Pediatr Dent. 2020 May-Jun;13(3):211-216. doi: 10.5005/jp-journals-10005-1751.
OBJECTIVES/AIMS: This study was designed to determine the endodontic working length (WL) of root canals using digital extraoral periapical radiography (EOPAR) technique and comparing its accuracy with the standard digital intraoral periapical radiography (IOPAR).
Sixty single-rooted mandibular first premolars indicated for orthodontic extraction were radiographed preoperatively to ensure closed apices. After gaining endodontic access, WL was determined by IOPAR using paralleling technique, followed by EOPAR, by placing a cone at +35° from the contralateral side. Accessed tooth was then extracted to obtain the actual root canal length and was compared with the radiographic lengths. Data were subjected to statistical analysis using paired test.
The actual length and the extraoral radiographic length showed no statistical significant difference ( = 0.326). The difference between the mean WL obtained by IOPA and EOPA was also not statistically significant ( = 0.096). The accuracy of IOPA technique was 97.87 ± 0.91% and that of EOPA technique was 94.65 ± 2.57%.
The EOPA technique with an angulation of +35° can be used as an alternative to IOPA for mandibular premolars in apprehensive children, dental phobic patients with low pain threshold, neurological difficulties, and exaggerated gag reflex.
Sridhara A, Konde S, Noojadi SR, Comparative Evaluation of Intraoral and Extraoral Periapical Radiographic Techniques in Determination of Working Length: An Study. Int J Clin Pediatr Dent 2020;13(3):211-216.
本研究旨在使用数字化口外根尖片（EOPAR）技术确定根管的牙髓治疗工作长度（WL），并将其准确性与标准数字化口内根尖片（IOPAR）进行比较。
选取60颗因正畸需要拔除的单根下颌第一前磨牙，术前进行X线片检查以确保根尖封闭。开髓后，采用平行投照技术通过IOPAR确定WL，然后通过从对侧以+35°角放置锥形束进行EOPAR。随后拔除患牙以获得实际根管长度，并与X线片长度进行比较。数据采用配对t检验进行统计分析。
实际长度与口外X线片长度无统计学显著差异（P = 0.326）。IOPA和EOPA获得的平均WL之间的差异也无统计学意义（P = 0.096）。IOPA技术的准确性为97.87 ± 0.91%，EOPA技术的准确性为94.65 ± 2.57%。
对于有焦虑情绪的儿童、疼痛阈值低的牙科恐惧症患者、有神经功能障碍以及有夸张恶心反射的患者，+35°角的EOPA技术可作为下颌前磨牙IOPA的替代方法。
Sridhara A, Konde S, Noojadi SR, 口内和口外根尖片技术在确定工作长度中的比较评价：一项研究。《国际临床儿科牙科学杂志》2020；13(3):211 - 216。
