Effect of the simulated periodontal ligament on cast post-and-core removal using an ultrasonic device

Brito-Júnior, Manoel; Braga, Neilor Mateus Antunes; Rodrigues, Danilo Costa; Camilo, Carla Cristina; Faria-e-Silva, André Luís

doi:10.1590/s1678-77572010000500017

Cited by 4 publications

(7 citation statements)

References 21 publications

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“…Comparison of the results of the ultrasound groups and the control group (without ultrasonic vibration) in the present study confirmed the effectiveness of the Enac in reducing the load necessary to remove intraradicular cast posts, as reported elsewhere (10,14,16). Several studies have reported that the type of luting agent can have an influence on the ultrasonic efficiency for post removal (12,13).…”

Section: Discussionsupporting

confidence: 90%

“…Usually, the roots of extracted teeth are embedded in resin cylinders in order to facilitate handling and test application. In this step, the simulation of periodontal ligament (PDL) is more consistent with the clinical reality (15,16). In the present study, this procedure was not performed, which could represent a methodological limitation.…”

Section: Discussionmentioning

confidence: 97%

“…Piezoelectric devices generate mechanical waves with high-frequency stability transmitting a minimal residual heat to dental structures under water cooling (17,18). For a long time, Enac-Osada, the Japanese-manufactured piezoelectric ultrasound, has been the most widely and tensile test after ultrasonic vibration (10)(11)(12)(13)(14)(15)(16).…”

Section: Discussionmentioning

confidence: 99%

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Comparison of different ultrasonic vibration modes for post removal

Braga

Silva²,

Carvalho-Júnior

et al. 2012

Braz. Dent. J.

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This in vitro study compared different ultrasonic vibration modes for intraradicular cast post removal. The crowns of 24 maxillary canines were removed, the roots were embedded in acrylic resin blocks, and the canals were treated endodontically. The post holes were prepared and root canal impressions were taken with self-cured resin acrylic. After casting, the posts were cemented with zinc phosphate cement. The samples were randomly distributed into 3 groups (n=8): G1: no ultrasonic vibration (control); G2: tip of the ultrasonic device positioned perpendicularly to core surface and close to the incisal edge; and G3: tip of the ultrasonic device positioned perpendicularly to core surface at cervical region, close to the line of cementation. An Enac OE-5 ultrasound unit with an ST-09 tip was used. All samples were submitted to the tensile test using an universal testing machine at a crosshead speed of 1 mm/min. Data were subjected to one-way ANOVA and Tukey's post-hoc tests (α=0.05). Mean values of the load to dislodge the posts (MPa) were: G1 = 4.6 (± 1.4) A; G2 = 2.8 (± 0.9) B, and G3= 0.9 (± 0.3) C. Therefore, the ultrasonic vibration applied with the tip of device close to the core's cervical area showed higher ability to reduce the retention of cast post to root canal.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

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Comparison of different ultrasonic vibration modes for post removal

Braga

Silva²,

Carvalho-Júnior

et al. 2012

Braz. Dent. J.

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“…However, various studies that assess bond strength between root canal posts and dentin after mechanical fatigue do not simulate periodontal ligament 3 , 8 . Similarly, most studies fail to simulate the periodontal ligament in fracture resistance tests 5 , 18 , although a few studies simulate the periodontal ligament using polyether 11 , 13 and polivynilsiloxane based elastomers 7 , 22 .…”

Section: Introductionmentioning

confidence: 99%

Influence of periodontal ligament simulation on bond strength and fracture resistance of roots restored with fiber posts

et al. 2014

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ObjectiveConsidering that periodontal ligament simulation may influence the stress distribution over teeth restored with intraradicular retainers, this study aimed to assess the combined effect of mechanical cycling and periodontal ligament simulation on both the bond strength between fiber posts and root dentin and the fracture resistance of teeth restored using glass fiber posts.Material and MethodsNinety roots were randomly distributed into 3 groups (n=10) (C-MC: control; P-MC: polyether; AS-MC: addition silicone) to test bond strength and 6 groups (n=10) (C: control; P: polyether; AS: addition silicone, without mechanical cycling, and C-MC, P-MC and AS-MC with mechanical cycling) to test fracture strength, according to the material used to simulate the periodontal ligament. For the bond strength test, fiber posts were cemented, cores were built, mechanical cycling was applied (2×106 cycles, 88 N, 2.2 Hz, and 45º incline), and the teeth cut into 3 slices (2 mm), which were then subjected to the push-out test at 1 mm/min. For the fracture strength test, fiber posts were cemented, cores were built, and half of the groups received mechanical cycling, followed by the compressive strength (45° to the long axis and 1 mm/min) performed on all groups.ResultsPeriodontal ligament simulation did not affect the bond strength (p=0.244) between post and dentin. Simulation of periodontal ligament (p=0.153) and application of mechanical cycling (p=0.97) did not affect fracture resistance.ConclusionsThe materials used to simulate the periodontal ligament did not affect fracture or bond strength, therefore periodontal ligament simulation using the tested materials could be considered optional in the conditions of the study.

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“…Bu nedenlerle, yapılan laboratuvar çalışmalarının klinik ortamını simule edebilmesi için periodontal ligament ve kemik dokusunun laboratuvar çalışmalarda taklit edilmesi gereklidir (2). Periodontal ligament oluşturulan çalışmaların bazılarında materyal olarak polieter (4,5) ve polivinilsilikon bazlı elastomerler (1,6) tercih edilmiştir. Restoratif materyaller birçok avantaja sahip olmasına rağmen, pulpa dokusu bulunmayan dişlerde vertikal kök kırıkları halen bilinen önemli problemlerdendir (7,8).…”

Section: Introductionunclassified