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Influence of temperature on the torsional properties of two thermally treated NiTi rotary instruments
Osaki, Roberto Barreto; Bramante, Clovis Monteiro; Vivan, Rodrigo Ricci; Alcalde, Murilo Priori; Calefi, Pedro Henrique Souza; Duarte, Marco Antonio Hungaro.
  • Osaki, Roberto Barreto; University of São Paulo. Department of Dentistry. Endodontics and Dental Materials, Bauru Dental School. BR
  • Bramante, Clovis Monteiro; University of São Paulo. Department of Dentistry. Endodontics and Dental Materials, Bauru Dental School. BR
  • Vivan, Rodrigo Ricci; University of São Paulo. Department of Dentistry. Endodontics and Dental Materials, Bauru Dental School. BR
  • Alcalde, Murilo Priori; University of São Paulo. Department of Dentistry. Endodontics and Dental Materials, Bauru Dental School. BR
  • Calefi, Pedro Henrique Souza; University of São Paulo. Department of Dentistry. Endodontics and Dental Materials, Bauru Dental School. BR
  • Duarte, Marco Antonio Hungaro; University of São Paulo. Department of Dentistry. Endodontics and Dental Materials, Bauru Dental School. BR
Braz. dent. j ; 34(1): 12-18, Jan.-Feb. 2023. tab, graf
Article in English | LILACS-Express | LILACS, BBO | ID: biblio-1420578
ABSTRACT
Abstract This study aimed to evaluate the influence of temperature on torsional strength and angular deflection of two experimental NiTi rotary instruments manufactured from Blue and Gold thermal treatments and with identical cross-sections. A total of 40 experimental NiTi instruments 25.06 and with a triangular cross-section and manufactured from Blue and Gold thermal treatments were used (n=20). The torsional test was performed in the 3 mm from the tip of the instrument according to ISO 3630-1. The torsional test evaluated the torsional strength and angular deflection to failure at room temperature (21°C ± 1° C) and body temperature (36°C ±1°C). The fractured surface of each fragment was observed by using scanning electron microscopy (SEM). Data were analyzed using an unpaired t test for inter and intra-group comparison and the level of significance was set at 5%. The results showed that the body temperature did not affect the torsional strength and angular deflection of the instruments when compared with room temperature (P>0.05). However, at body temperature, the Blue NiTi instruments presented significantly lower angular deflection in comparison with Gold NiTi instruments (P<0.05). There was no significant difference regarding the torsional strength of the instruments at body temperature (P>0.05). The temperature did not affect the torsional strength of the instruments manufactured from Blue and Gold technology. However, the Blue NiTi instruments presented significantly lower angular deflection than Gold instruments at 36°C temperature.
RESUMO
Resumo O objetivo deste estudo foi avaliar a influência da temperatura nas propriedades de torção (resistência à torção e deflexão angular) de dois instrumentos rotatórios experimentais de NiTi fabricados com secção triangu.ar e tratamentos térmicos Blue e Gold. Quarenta instrumentos experimentais de NiTi 25.06 com tratamento térmico Blue e Gold foram usados (n= 20). Foi avaliada a resistência torcional e a deflexão angular até a fratura na temperatura ambiente (21°C ± 1°C) e corporal (36°C ± 1°C). O teste torcional foi realizado nos 3 mm da ponta dos instrumentos de acordo com a ISO 3630-1. A superfície fraturada de cada instrumento foi observada pelo microscópio eletrônico de varredura (MEV). Os dados foram analisados por meio do teste t não pareado para a comparação inter e intragrupos e o nível de significância à 5%. Os resultados demonstraram que a temperatura corporal não afetou a resistência a torção e deflexão angular quando comparada com a temperatura ambiente (P>0.05). No entanto, na temperatura de 36°C o instrumento com tratamento térmico Blue apresentou menor deflexão angular quando comparado com o Gold (P<0.05). Não houve diferença significante entre os dois instrumentos em relação a resistência à torção. A temperatura corporal não modificou a resistência torcional dos instrumentos fabricados com tecnologia Blue e Gold. No entanto, os instrumentos com NiTi Blue apresentaram menor deflexão angular do que o Gold a 36°C.


Full text: Available Index: LILACS (Americas) Language: English Journal: Braz. dent. j Journal subject: Dentistry Year: 2023 Type: Article / Project document Affiliation country: Brazil Institution/Affiliation country: University of São Paulo/BR

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Full text: Available Index: LILACS (Americas) Language: English Journal: Braz. dent. j Journal subject: Dentistry Year: 2023 Type: Article / Project document Affiliation country: Brazil Institution/Affiliation country: University of São Paulo/BR