Accuracy of endodontic millimeter rulers and calibrator hole, and evaluation of the regularity of the calibrator hole surface

Manoela Teixeira de Sant’Anna DADALTI, Bruna Danielle Menezes DIAS, Adília Maria Vieira BRUNO, Patrícia de Andrade RISSO

Objective: The aim was to evaluate the accuracy of the millimeter and calibration portion and evaluate the regularity of the calibrator orifice surfaces of the endodontic rulers. Methods: The millimeter portion of the Angelus, Maillefer, Maquira, Microdont and Prisma rulers was evaluated with an electronic digital caliper. The calibration holes of the Maillefer, Prisma and Angelus were measured with Profile Projector. The surface regularity of calibration holes was evaluated and classified in S1- without irregularities and S2- with irregularities. The accuracy analysis of the millimeter and calibration was performed with T-Test (p=0.05) and the frequencies of the surface types with Chi-square (p<0.05). Results: The Maillefer was the only rulers with accuracy in all lengths and holes. Prisma presented statistically more S2 type holes when compared with other endodontic rulers evaluated (p <0.05). There was no statistically significant difference between Angelus and Maillefer (p> 0.05). Conclusion: The Maillefer presented accuracy in the millimeter and calibration portion. Angelus endodontic rulers were not accurate at any rated length of the millimeter portion and it was not accurate in most calibration holes evaluated. Prisma endodontic ruler showed significantly more calibration holes with irregular surfaces than Angelus and Maillefer. We emphasize the need for quality control and specific standards for endodontic rulers manufacturing.

Keywords: Dimensional Measurement Accuracy. Endodontic. Body Surface Area.

How to cite: Dadalti MTS, Dias BDM, Bruno AMV, Risso PA. Accuracy of endodontic millimeter rulers and calibrator hole, and evaluation of the regularity of the calibrator hole surface. Dental Press Endod. 2021 Sept-Dec;11(3):40-5.

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