İki farklı endodontik cetvelin (endoblok) cetvel ve kalibrasyon deliklerinin ölçüm doğruluklarının incelenmesi

Objective: Endoblock is an odontometric instrument that helps to determine and maintain the working length in endodontic practice. The aim of this study was to evaluate the millimetric accuracy of two different endoblocks, one of which is domestic-manufacture. Materials and Method: Three endoblocks (six in total) from each brand which are Mini-Endo-Bloc (Dentsply-Maillefer, Ballaigues, Switzerland) and Resident (Kibar Dental. Istanbul, Turkey) were obtained. The milimetric marks located on the ruler side of the endoblock (between 12-30) was measured using an electronic caliper with a 0.01 mm precision. The depth of the file-length-calibration holes located on the upper side of the endoblock (between 12.0-27.5) was measured using the same caliper but by means of transferring the depth to a #40 file with silicone stopper. Each parallel was measured five times. Statistical control limits and specification limits were compared to examine the measurement quality of each endoblock brand. The specification limits were calculated in 3 standard deviation (sigma) widths taking the reference values into account indicated on the product. Control limits were calculated utilizing the measurements obtained during product testing. If the control limits exceeded the specification limits, it was considered an error. Results: No errors were observed in the ruler and calibration holes of the Mini-Endo-Bloc. Resident's 23, 25-30 mm ruler lines (measurements above the reference value) and 15.0, 18.0, 18.5 and 19.0 holes (measurements below the reference value) failed to meet the desired specifications. Conclusion: The Mini-Endo-Bloc fully met the required quality standards in ruler and hole measurements. Resident did not meet the required quality standard.