DIMENSIONAL COMPATIBILITY ANALYSIS OF ROTARY INSTRUMENTS WITH GUTTA PERCHA CONES OF PROTAPER UNIVERSAL SYSTEM

• Published in: International journal of clinical dentistry Vol. 13; no. 2; pp. 147 - 155
• Main Authors: Dadalti, Manoela Teixeira de Sant'Anna, de Oliveira, Natália Felizardo, Risso, Patrícia de Andrade, Ormiga, Fabíola
• Format: Journal Article
• Language: English
• Published: Hauppauge Nova Science Publishers, Inc 01.01.2020
• Subjects: Adaptation; Compatibility; Cones; Diameters; Dimensional analysis; Endodontics; Evaluation; Mathematical analysis; Statistical methods; Switzerland
• ISSN: 1939-5833; 2374-0906

Purpose: to evaluate the compatibility of ProTaper Universal (PU) rotary instruments with the respective gutta-percha cones through the dimensional analysis and in vitro adaptation of the PU cone after the preparation of root canals with relative rotary instruments. Methods: Ten samples of each PU finishing instrument and ten samples of each corresponding PU gutta-percha cone were measured from D0 to D16 through the profile projector. Then, 60 buccal canals were distributed between the F1, F2 and F3 groups and 40 palatal canals in the F4 and F5 groups. The canals were prepared and finalized with an instrument corresponding to the group name and selected cones compatible with the last instrument used. For each canals three corresponding cones were tested evaluating their adaptation in working length. The unpaired t-test compared the values of the corresponding instrument and cones diameters (p < 0.05), the Kruskal Wallis test evaluated a possible difference in cones adaptation between the groups and the Chisquare Test evaluated the adaptation of the cones in the canals within each group (p < 0.05). Results: the dimensional analysis showed a statistically significant difference in most of the diameters evaluated. The number of cones adapted was significantly lower than the non-adapted cones. We concluded that the PU instruments were not compatible with the corresponding cones in most of the evaluated areas. The groups F1, F2 and F3 showed the lowest amount of cones adapted. Clinical significance: The compatibility between the instruments and cones within the same system facilitates the cone selection step, influences the good apical sealing and the non-overflow of the obturator material for the periapical tissue.