Assessment of a Cavity to Optimize Ultrasonic Efficiency to Remove Intraradicular Posts

超声波传感器 材料科学 超声波 冠状面 芯(光纤) 口腔 牙科 生物医学工程 复合材料 医学 解剖 放射科
作者
Izabela Araujo Aguiar Graça,Emílio Carlos Sponchiado Júnior,André Augusto Franco Marques,Leandro de Moura Martins,Ângela Delfina Bittencourt Garrido
出处
期刊:Journal of Endodontics [Elsevier BV]
卷期号:43 (8): 1350-1353
标识
DOI:10.1016/j.joen.2017.03.028
摘要

Introduction The study assessed an in vitro protocol for the removal of cast metal posts using ultrasonic vibration in multirooted teeth by drilling a cavity in the coronal portion of the post followed by ultrasound application in the cavity. Method Forty endodontically treated molars received intraradicular cast posts and were divided into 4 groups according to the removal protocol: the control group, no cavity and no ultrasonic vibration; the ultrasonic group, no cavity and ultrasonic vibration in the coronal portion of the core; the cavity group, a cavity in the core and no ultrasonic vibration; and the cavity ultrasonic group, a cavity in the core and ultrasonic vibration inside the cavity. The traction test was performed on all samples using a universal testing machine (EMIC DL-2000; EMIC Equipamentos e Sistemas de Ensaio LTDA, São José dos Pinhais, PR, Brazil) at a speed of 1 mm/min, obtaining values in Newtons. The data were statistically analyzed using analysis of variance and the Tukey-Kramer test (P < .05). Results The results showed statistically significant differences between the tested groups (control group = 322.74 N, ultrasonic group = 283.09 N, cavity group = 244.00 N, and cavity ultrasonic group = 237.69 N). The lowest mean strength was found in the group that received ultrasonic vibration inside the cavity. Conclusions Preparing a cavity in the coronal core followed by ultrasonic vibration reduces the traction force required for removal. The removal protocol was effective for removing posts in multirooted teeth cemented with zinc phosphate.

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