An experimental study of the removal of cemented dowel-retained cast cores by ultrasonic vibration

Yoshida, Takakazu; Gomyo, Shunji; Itoh, Tomomi; Shibata, Taiji; Sekine, Ichiro

doi:10.1016/s0099-2399(97)80055-6

Cited by 27 publications

(24 citation statements)

References 5 publications

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“…This same time period was used with success by Oliveira et al (6) for the removal of prefabricated posts cemented with zinc phosphate cement in a 10-mm extension, with a post displacement from the canal of 67%. Variations from 2 to 16 min (1,4,5,8,17) in vibration time necessary to dislodge the post can be attributed to extension or experimental design differences.…”

Section: Discussionmentioning

confidence: 99%

“…The end tip of the ultrasound was positioned in the occlusal and lateral aspects of the post, bilaterally, for a period of one minute in each side. Yoshida et al (17) reports that the cement layer opposite to the ultrasound is destroyed before the one from the same side on which it had been placed. Transferring this reasoning to the present study, when the tip is positioned in three different directions, the cement breakage would occur apically and in two opposite lateral sides.…”

Section: Discussionmentioning

confidence: 99%

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Evaluation of intracanal post removal using ultrasound

et al. 2004

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The aim of this study was to determine the effect of ultrasonic vibration on the force necessary to remove pre-fabricated and anatomic and cast posts. Two hundred and forty teeth were divided into two groups. In group I, a 0.8-mm metallic pre-fabricated post, UnimetricMaillefer, was utilized; in group II, cast copper-aluminum alloy posts measuring 0.8, 1.0 and 1.2 mm in diameter were used. The root canals were prepared in three different diameters: 0.8, 1.0 and 1.2 mm, with a length of 10 mm. The posts were cemented with glass monomer cement resulting in 20 specimens for each subgroup. Half of the sample was submitted to ultrasonic vibration for 3 min, while the other half did not receive any vibration. The specimens were submitted to traction in a universal testing machine. The results were analyzed by non-parametric Mann-Whitney U, Wilcoxon and Kruskal-Wallis tests. The application of ultrasonic vibration significantly reduced the retention provided by the glass ionomer cement in the fixation of intracanal posts. The ultrasonic action was effective in both pre-fabricated and anatomic and cast posts. The effectiveness of the ultrasonic vibration was not related to the cementation line or the diameter of the post.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Evaluation of intracanal post removal using ultrasound

et al. 2004

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“…15,16 Reports evaluating the ability of ultrasound instruments to remove luted posts from teeth have shown a direct correlation between the vibrations generated and post loosening. 17,18 Because of the characteristics of the handpiece mechanism, the cutting instruments, and the speed of rotation, rotary instrumentation produces vibrations equivalent to those produced by ultrasound instruments. 19 Additionally, the vibrations produced by rotary diamond instruments in high-speed handpieces may affect the post/tooth cement layer, consequently jeopardizing post stability and retention.…”

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confidence: 99%

Influence of core-finishing intervals on tensile strength of cast posts-and-cores luted with zinc phosphate cement

et al. 2012

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The core finishing of cast posts-and-cores after luting is routine in dental practice. However, the effects of the vibrations produced by the rotary cutting instruments over the luting cements are not welldocumented. This study evaluated the influence of the time intervals that elapsed between the cementation and the core-finishing procedures on the tensile strength of cast posts-and-cores luted with zinc phosphate cement. Forty-eight bovine incisor roots were selected, endodontically treated, and divided into four groups (n = 12): GA, control (without finishing); GB, GC, and GD, subjected to finishing at 20 minutes, 60 minutes, and 24 hours after cementation, respectively. Root canals were molded, and the resin patterns were cast in copper-aluminum alloy. Cast posts-and-cores were luted with zinc phosphate cement, and the corefinishing procedures were applied according to the groups. The tensile tests were performed at a crosshead speed of 0.5 mm/min for all groups, 24 hours after the core-finishing procedures. The data were subjected to one-way analysis of variance (ANOVA) and Tukey's test (α = 0.05). No significant differences were observed in the tensile strengths between the control and experimental groups, regardless of the time interval that elapsed between the luting and finishing steps. Within the limitations of the present study, it was demonstrated that the core-finishing procedures and time intervals that elapsed after luting did not appear to affect the retention of cast posts-and-cores when zinc phosphate cement was used.

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“…26 The results of the present study showed that all the cast posts were successfully removed in a short time interval (mean time up to 2 minutes). Variations from 2 to 16 minutes 15,16,18,27,28 in vibration time necessary to dislodge the posts can be attributed to experimental design differences. 17 In the present study, an effort was made to maximize the energy transfer from the instrument tip to the post, evaluating the angle and the position of the tip in relation to the post, according other authors.…”

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confidence: 99%

“…The cement layer opposite to the ultrasound is destroyed before the one from the same side on which it had been placed. 28 The ultrasonic vibration induced fracture propagation in the cement itself, and also separation of cement from the mettalic cast. These findings suggesting that the resistance to ultrasonic vibration is smaller in the metal-cement interface than in the dentin-cement interface.…”

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confidence: 99%

Comparison of Different Ultrasonic Tip Angulations on Time Required for Cast Post Removal

Silva¹,

Cláudia²,

Xavier³

et al. 2014

World Journal of Dentistry

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Aim: The aim of this study was to design, develop and compare ultrasound tips with different angulations on time required for cast post removal. Materials and methods:To test and compare the ultrasonic tips developed, 36 metal patterns were fabricated from tin bars, on a mechanical precision lathe. Each metal pattern simulated an endodontically treated tooth, without coronal remaining, prepared to receive a cast post with 10 mm long. The cast posts were cemented with zinc phosphate cement. The metal patterns with their respective intraradicular posts cemented were stored at 37ºC, at relative humidity 100%, for a period of 48 hours. After this period, the specimens were randomly divided into three groups, and each group was submitted to the action of one of the ultrasonic tips (n = 12): G1-tip with 30º angulation; G2-tip with 45º angulation and G3-tip without angulation (straight tip). Each ultrasonic tip was used on the surfaces of the cast posts (mesial, distal, buccal, lingual and incisal) for 5 seconds, at maximum power, until the cast post removal using an ultrasound device (Jet Sonic, Satelec System, Gnatus, Ribeirão Preto, SP, Brazil). The time required for cast posts removal was recorded and the data statistically analyzed by the ANOVA and Tukey tests (p < 0.05). Results:The means of time evaluated for cast posts removal were G1: 59.25s; G2: 119.0s and G3: 48.4s. Group 2 presented the highest mean value in seconds, differing statistically from G1 and G3. No significant differences were observed between G1 and G3. Conclusion:It may be concluded that the ultrasonic tip angu lation had a direct influence on the time required for cast posts removal by ultrasound. When the different ultrasonic tips were compared, the 30° angulation and the straight tips required a shorter ultrasonic vibration time. All cast posts luted with zinc phosphate were successfully removed in a relatively short time by the different ultrasonic tips analyzed.

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An experimental study of the removal of cemented dowel-retained cast cores by ultrasonic vibration

Cited by 27 publications

References 5 publications

Evaluation of intracanal post removal using ultrasound

Evaluation of intracanal post removal using ultrasound

Influence of core-finishing intervals on tensile strength of cast posts-and-cores luted with zinc phosphate cement

Comparison of Different Ultrasonic Tip Angulations on Time Required for Cast Post Removal

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