Yavari Hamidreza, Samiei Mohammad, Shahi Shahriar, Borna Zahra, Abdollahi Amir Ardalan, Ghiasvand Negar, Shariati Gholamreza
Department of Endodontics, Dental and Periodontal Research Center, Dental School, Tabriz University of Medical Sciences, Tabriz, Iran;
Department of Endodontics, Dental School, Urmia University of Medical Sciences, Urmia, Iran;
Iran Endod J. 2015;10(2):127-30. Epub 2015 Mar 18.
The purpose of this study was to evaluate the radiographic quality of root canal fillings by fourth-, fifth-, and sixth-year undergraduate students at Tabriz Faculty of Dentistry between 2006 and 2012.
A total of 1183 root canal fillings in 620 teeth were evaluated by two investigators (and in case of disagreement by a third investigator) regarding the presence or absence of under-fillings, over-fillings and perforations. For each tooth, preoperative, working and postoperative radiographs were checked. The Pearson's chi-square test was used for statistical evaluation of the data. Inter-examiner agreement was measured by Cohen's kappa (k) values. The level of significance was set at 0.05.
Total frequencies of over-filling, under-filling and perforation were 5.6%, 20.4% and 1.9%, respectively. There were significant differences between frequencies of over- and under-fillings (P<0.05). Unacceptable quality, under- and over-fillings were detected in 27.9% of 1183 evaluated canals.
The technical quality of root canal therapies performed by undergraduate dental students using step-back preparation and lateral compaction techniques was unacceptable in almost one-fourth of the cases.
本研究旨在评估2006年至2012年间大不里士牙科学院四、五、六年级本科生根管充填的影像学质量。
两名研究者（如有分歧则由第三名研究者参与）对620颗牙齿中的1183个根管充填进行评估，检查是否存在欠填、超填和穿孔情况。对每颗牙齿的术前、术中及术后X线片进行检查。采用Pearson卡方检验对数据进行统计学评估。通过Cohen's kappa（k）值衡量检查者间的一致性。显著性水平设定为0.05。
超填、欠填和穿孔的总发生率分别为5.6%、20.4%和1.9%。超填和欠填的发生率之间存在显著差异（P<0.05）。在1183个评估根管中，27.9%的根管存在质量不合格、欠填和超填情况。
牙科本科生采用逐步后退法预备和侧向加压技术进行根管治疗时，近四分之一病例的技术质量不合格。
