The wearing of the core and the cement line maximize the ultrasonic removal of intraradicular cast posts
Keywords:
Intraradicular cast posts, UltrasoundAbstract
This in vitro study assessed the influence of the wearing of the core and the cement line in the ultrasonic removal of intraradicular cast posts. Twenty-four premolars with single root canals were sectioned transversally at the cementoenamel junction, keeping them 15mm of the root. The root canals were endodontically treated, post spaces were prepared at a 9 mm depth, and their impressions were obtained, followed by casting. The zinc phosphate cement (SS White) was used in post luting, and the set was fixed to PVC tubes in self-curing acrylic resin. The blocs were placed into an oven at 37ºC and 100% moisture. Seven days later, the samples were randomly distributed into 2 groups (n=12): G1- wearing of the core and the cement line + ultrasound and G2- ultra-sound only. In G1, the cores were worn out with a # 1557 bur and a tapered diamond point # 3203 in the cement line at 2 mm depth. The Enac (Osada) device was used with the power set to maximum (ST 09 tip) on all surrounding surfaces of the cores. Time of application was recorded with a chronometer until the complete post-dislodgment and data could be analyzed by a t-Student test (p<0,05). Averages required for the removal of cast posts from G1 and G2 were 48.4 and 99.4 seconds, respectively, with a significant statistical difference observed between the groups (p=0.036). Therefore, the wearing of the core and the cement line significantly decreased the time of ultrasonic vibration in the removal of intraradicular cast posts cemented with zinc phosphate cement.
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References
Vasconcellos AB, Lopes HP. Retentores intraradiculares. In: Lopes, HP, Siqueira Jr JF. Endodontia: biologia e técnica. 2 ed. Rio de Janeiro: Medsi; 2004. p.696-706.
Lopes HP, Siqueira Jr JF, Elias CN. Retratamento endodôntico. In: Lopes, HP, Siqueira Jr JF. Endodontia: biologia e técnica. 2 ed. Rio de Janeiro: Medsi; 2004. p.727-85.
Stabholz A, Friedman S. Endodontic retreatment : case selection and technique. Part 2: Treatment planning for retreatment. J Endod 1988;14:607-14.
Chalfin H, Weseley P, Solomon C. Removal of restorative posts for the purpose of nonsurgical endodontic retreatment: report of cases. J Am Dent Assoc 1990;120:169-72.
Lopes HP, Elias CN, Costa Filho AS, Chiminazzo MA. Desgaste intra-radicular determinado pela remoção de pinos metálicos, através de instrumentos rotatórios.Rev Bras Odontol 1993;50:20.
Abbott PV. Incidence of root fractures and methods used for post removal. Int Endod J 2002; 35:63-7.
Berbert A, Tanomaru Filho M, Ueno AH, Bramante CM, Ishikiriama A. The influence of ultrasound in removing intraradicular posts. Int Endod J 1995; 28:54-6.
Buoncristiani J, Seto BG, Caputo AA. Evaluation of ultrasonic and sonic instruments for intraradicular post removal. J Endod 1994; 20:486-9.
Imura N, Zuolo ML. Remoção de retentor intraradicular com aparelho de ultra-som. Rev APCD 1997; 51:262-7.
Hauman CH, Chandler NP, Purton DG. Factors influencing the removal of posts. Int Endod J 2003; 36:687-90.
Deus QD. de Endodontia. 5 ed. Rio de Janeiro: Medsi; 1992.
Oliveira MRS, Biffi JCG, Mota AS, Maniglia CAG. Avaliação da remoção de pinos intra-radiculares pré-fabricados através de técnica ultra-sônica. Rev APCD 1999; 53:372-7.
Peciuliene V, Rimkuviene J, Maneliene R, Pletkus R. Factors influencing the removal of posts. Stomatol 2005; 7:21-23.
Gomes APM, Kubo CH, Santos RA, Santos DR, Padilha RQ. The influence of ultrasound on the retention of cast posts cemented with different agents. Int Endod J 2001; 34:93-9.
Garrido AD, Fonseca TS, Alfredo E, Silva-Sousa YT, Sousa-Neto MD. Influence of ultrasound, with and without water spray cooling, on removal of posts cemented with resin or zinc phosphate cements. J Endod 2004; 30:173-6.
Silva MR, Biffi JC, Mota AS, Fernandes Neto AJ, Neves FD. Evaluation of intracanal post removal using ultrasound. Braz Dent J 2004;15:119-26.
Chan FW, Harcourt JK, Brockhurst PJ. The effect of post adaptation in the root canal on retention of posts cemented with various cements. Aust Dent J 1993; 38:39-45.
Di Girolamo Netto J A, Matson E. Núcleos metálicos fundidos: técnicas de remoção através do ultra-som e suas implicações na clínica. Rev APCD 1990;12:2-7.
Berbert FLCV, Crisci FS, Berbert A, Bonetti Filho, I, Vaz LG. Efeito do desgaste da linha de cimento, da vibração ultra-sônica e da associação de ambas sobre a força de tração empregada na remoção de pinos intra-radiculares. Rev Odontol UNESP 2002; 31:215-29.
Carvalhais HPM, Maltos KLM, Ramos-Jorge ML,Garcia RCF, Camargos RB, Paiva SM, Cormacchia,TPM. Análise comparativa de dois aparelhos ultra-sônicos na remoção de pinos intraradiculares. Arq Odontol 2006; 42:95-103.
Dixon EB, Kaczkowski PJ, Nicholls JI, Harrington GW. Comparison of two ultrasonic instruments for post removal. J Endod 2002; 28:111-5.
Johnson WT, Leary JM, Boyer DB. Effect of ultrasonic vibration on post removal in extracted human premolar teeth. J Endod 1996; 22:487-8.
Smith BJ. Removal of fractured posts using ultrasonic vibration: an in vivo study. J Endod 2001; 27:632-4.
Braga NMA, Alfredo E, Vansan LP, Fonseca TS, Ferraz JAB, Sousa-Neto MD. Efficacy of ultrasound in removal of intraradicular posts using different techniques. J Oral Scien 2005; 47:117-121.
Garrido ÂDB, Fonseca TS, Silva-Sousa YT, Alfredo E, Sousa-Neto MD. Evaluation of root external temperature during the application of ultrasound in removal of intraradicular. Gen Dent 2007; 55:121-124.
