การเปรียบเทียบความยาวคลองรากฟันกรามน้ำนมระหว่างวิธีคำนวณจากภาพรังสีรอบปลายรากกับวิธีวัดจากเครื่องกำหนดตำแหน่งปลายคลองรากฟันด้วยไฟฟ้า / สุชยา ตั้งธรรม = The comparison of root canal length in primary molars between calculating from periapical radiograph and electronic apex locator / Suchaya Tangtham
The aim of this study was to compare the difference of root canal length in 40 root canals of primary molars measuring by calculating from periapical radiograph versus electronic apex locator. In calculating from periapical radiographic method, the file which fits to the root canal was inserted into the root canal. Crown surface which contacts the stopper was cut perpendicular to the axis of the file and was used as reference point, then took the radiograph. The root canal length was calculated from the periapical radiograph. In electronic apex locator method, the new file but the same size was inserted into the same root canal. The stopper was placed at the same reference point on the crown. The root length was measured when the electronic apex locator reads at “APEX”. This value was used as the root canal length from the electronic apex locator. The root canal lengths measured by both methods were compared and statistically analyzed by paired t-test. In case of no or mild root resorption, the results showed no statistically significant difference in root canal lengths from the two methods (p>0.05). The mean of root canal length from calculating from periapical radiographic method was more than electronic apex locator 0.26 ± 0.86 mm.
