Evaluation of several protocols for the application of ultrasound during the removal of cast intraradicular posts cemented with zinc phosphate cement

Garrido, Ângela Delfina Bittencourt; Oliveira, Alcides Gomes; Osório, J. E. V.; Silva-Sousa, Yara Teresinha Corrêa; Sousa‐Neto, Manoel Damião

doi:10.1111/j.1365-2591.2009.01555.x

Cited by 15 publications

(22 citation statements)

References 19 publications

(43 reference statements)

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“…Furthermore, the application time in the present study was 15 seconds on each surface, totaling 1 minute of application, which is extremely important since many studies apply ultrasonic forces for longer periods, sucha as 3 to 16 minutes of vibration 25,26,27. It is known that the application of the ultrasonic tip for longer periods than 1 minute considerably increases temperature, which dissipates through the post/root interface causing several damages 16.…”

Section: Discussionmentioning

confidence: 99%

“…Besides the type of device selected, other factors also influence the effectiveness of posts removal procedure: the method of ultrasonic vibration application, the use or not of cooling during the process, diameter and height of the post, tip movement type, which may be continuous or alternating, and the design of the ultrasonic tips 1,19,22,23,24,25. Several studies have reported techniques and devices that facilitate the removal of intraradicular posts.…”

Section: Discussionmentioning

confidence: 99%

“…Cohesive failure occurred in all the tested specimens, confirming the results of previous studies. According to Garrido et al and El-Mowafy and Milenkovic, cohesive failures occur more frequently in posts cemented with zinc phosphate cement than in posts cemented with resinous cements, which have mostly adhesive failures 25,29. The results of the present study demonstrated that the tip design is an important technical issue which increases the efficacy of ultrasonic devices during intraradicular post removal.…”

Section: Discussionmentioning

confidence: 99%

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Effect of ultrasonic tip designs on intraradicular post removal

et al. 2014

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ObjectivesTo evaluate the effect of different ultrasonic tip designs on intraradicular post removal.Materials and MethodsThe crowns of forty human canine teeth were removed, and after biomechanical preparation and filling, the roots were embedded in acrylic resin blocks. The post spaces were made, and root canal molding was performed with self-cured acrylic resin. After casting (Cu-Al), the posts were cemented with zinc phosphate cement. The specimens were randomly separated into 4 groups (n = 10), as follows: G1 - no ultrasonic vibration (control); G2 - ultrasonic vibration using an elongated cylindrical-shaped and active rounded tip; G3 - ultrasonic vibration with a flattened convex and linear active tip; G4 - ultrasonic vibration with active semicircular tapered tip. Ultrasonic vibration was applied for 15 seconds on each post surface and tensile test was performed in a Universal Testing Machine (Instron 4444 - 1 mm/min).ResultsG4 presented the highest mean values, however, with no statistically significant difference in comparison to G3 (P > 0.05). G2 presented the lowest mean values with statistically significant difference to G3 and G4 (P < 0.05).ConclusionsUltrasonic vibration with elongated cylindrical-shaped and active rounded tip was most effective in reducing force required for intraradicular post removal.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Effect of ultrasonic tip designs on intraradicular post removal

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“…This alternative vibration increases the fragmentation of the zinc phosphate cement, thus favoring the detachment of the intraradicular posts. 17,21 The power and the frequency of the ultrasonic waves generated by the device determine the physical characteristics of the vibrations.…”

Section: Discussionmentioning

confidence: 99%

“…19 Several factors may interfere in the ultrasonic efficiency, such as the type of luting agent, length, form, diameter and type of post and post adaptation to the root canal walls. 8,17,18,20,21 The efficacy of ultrasound is related to the intensity and movement of the vibration, the manner in which the tip is applied on the core and the type of tip used. …”

Section: 16mentioning

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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