Light transmission through fiber post: The effect on adhesion, elastic modulus and hardness of dual-cure resin cement

Radović, Ivana; Corciolani, Gabriele; Magni, Elisa; Krstanovic, Goranka; Pavlović, Vladimir; Vulicevic, Zoran R.; Ferrari, Marco

doi:10.1016/j.dental.2009.01.004

Cited by 61 publications

(56 citation statements)

References 20 publications

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“…LIGHT-POST � is composed of unidirectional quartz-fiber post system with double tapers. It can transmit light along the post to improve degree of conversion of resin cements deep in the canal, 9) and elastic modulus of the post is similar to dentin. ParaPost � XT TM is titanium post system and elastic modulus is about 60 GPa 25) , which the value is closer to that of dentin than stainless steel.…”

Section: Basic Researchmentioning

confidence: 99%

“…In addition, fiber posts can transmit light to deeper part of the canal so they can improve degree of polymerization of resin cements. 9) Previous studies of fiber posts reported that fiber posts tend to result favorable fracture pattern compared with metal posts, because metal posts concentrate stress on surrounding dentin at the level of apical end of metal posts, rather than redistributed along the post surface as in fiber posts. It can be said that fiber posts with resin cement, therefore, are the most appropriate for root strengthening procedure clinically.…”

Section: ⅰ Introductionmentioning

confidence: 99%

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Influence of post types and sizes on fracture resistance in the immature tooth model

Kim

Park

et al. 2010

J Korean Acad Conserv Dent

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The purpose of this study was to determine the effect of post types and sizes on fracture resistance in immature tooth model with various restorative techniques. Bovine incisors were sectioned 8 mm above and 12 mm below the cementoenamel junction to simulate immature tooth model. To compare various postand-core restorations, canals were restored with gutta-percha and resin core, or reinforced dentin wall with dual-cured resin composite, followed by placement of D.T. LIGHT-POST, ParaPost XT, and various sizes of EverStick Post individually. All of specimens were stored in the distilled water for 72 hours and underwent 6,000 thermal cycles. After simulation of periodontal ligament structure with polyether impression material, compressive load was applied at 45 degrees to the long axis of the specimen until fracture was occurred.Experimental groups reinforced with post and composite resin were shown significantly higher fracture strength than gutta-percha group without post placement (p < 0.05). Most specimens fractured limited to cervical third of roots. Post types did not influence on fracture resistance and fracture level significantly when cement space was filled with dual-cured resin composite. In addition, no statistically significant differences were seen between customized and standardized glass fiber posts, which cement spaces were filled with resin cement or composite resin individually. Therefore, root reinforcement procedures as above in immature teeth improved fracture resistance regardless of post types and sizes. [J Kor Acad Cons Dent 35(4):257-266, 2010]

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Section: Basic Researchmentioning

confidence: 99%

Section: ⅰ Introductionmentioning

confidence: 99%

Influence of post types and sizes on fracture resistance in the immature tooth model

Kim

Park

et al. 2010

J Korean Acad Conserv Dent

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“…Microhardness was different between cements evaluated, thus multilink resin cement showed lower microhardness values, however, with low variation after thermocycling, a fact that maybe due to its chemical cure, because as there is no light source for your immediate polymerization, [18] there action takes place over a longer time, providing the material microhardness lower levels, but more stable.…”

Section: Discussionmentioning

confidence: 99%

“…[1,14,18,[21][22][23] The autopolymerizing resin cement presented a totally opposite situation showing the highest hardness value in apical third, and the lowest value in cervical third, before and after thermocycling.…”

Section: Discussionmentioning

confidence: 99%

Microhardness of luting agents used for fiber post cementation submitted to thermo cycling

Zavanelli¹,

Mazaro²,

Kian³

et al. 2014

JCRI

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Aims and Objectives:The aim of this study was to analyze the microhardness of three resin cements used in cementing glass fiber posts in bovine incisor. The microhardness was analyzed in cervical, middle and apical thirds before and after thermocycling process. Materials and Methods: Bovine teeth were instrumented and divided into 3 groups composed of 10 teeth each. Then, the teeth were sectioned and obturated and had their canals prepared at a depth of 12mm. Once proceeded the desobturation, the roots and glass fiber posts were prepared for adhesive cementation. After cementation, the microhardness reading was carried out. After initial reading, the samples were placed in a thermocycler and subjected to 2,000 cycles and a new microhardness reading. The data collected were subjected to analysis of variance (ANOVA) and Turkey's test. Results: It was observed a statistical difference among the microhardness of resin cements. However, the statistical difference of microhardness before and after thermocycling appeared only in group U-200. Conclusion: Thermocycling reduced microhardness values in all cements evaluated in this study. The autopolymerizing cement Multilink presented the most stable microhardness mean values after thermocycling in the coronal, middle and apical thirds.

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“…The force increased from 0 to 200 mN in 60 s intervals, which was applied constantly for 15 s. Then the force was gradually removed from 200 mN to 0 mN in 60 s intervals. The load and the penetration depth of the indenter were continuously measured during the load-unload-hysteresis (22). The hardness is defined as the test force divided by the apparent area of the indentation at maximal force.…”

Section: Dynamic Indentation Testmentioning

confidence: 99%

Measurement of Elastic Modulus and Vickers Hardness of Surround Bone Implant Using Dynamic Microindentation - Parameters Definition

et al. 2014

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The clinical performance of dental implants is strongly defined by biomechanical principles. The aim of this study was to quantify the Vicker's hardness (VHN) and elastic modulus (E) surround bone to dental implant in different regions, and to discuss the parameters of dynamic microindantion test. Ten cylindrical implants with morse taper interface (Titamax CM, Neodent; 3.5 mm diameter and 7 mm a height) were inserted in rabbit tibia. The mechanical properties were analyzed using microhardness dynamic indenter with 200 mN load and 15 s penetration time. Seven continuous indentations were made distancing 0.08 mm between each other perpendicularly to the implant-bone interface towards the external surface, at the limit of low (Lp) and high implant profile (Hp). Data were analyzed by Student's t-test ( a=0.05) to compare the E and VHN values obtained on both regions. Mean and standard deviation of E (GPa) were: Lp. 16.6 ± 1.7, Hp. 17.0 ± 2.5 and VHN (N/mm 2 ): Lp. 12.6 ± 40.8, Hp. 120.1 ± 43.7. No statistical difference was found between bone mechanical properties of high and low profile of the surround bone to implant, demonstrating that the bone characterization homogeneously is pertinent. Dynamic microindantion method proved to be highly useful in the characterization of the individual peri-implant bone tissue. Measurement of Elastic Modulus a n d V i c k e r s H a r d n e s s o f Surround Bone Implant Using D y n a m i c M i c r o i n d e n t a t i o n -P a r a m e t e r s D e f i n i t i o n

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Light transmission through fiber post: The effect on adhesion, elastic modulus and hardness of dual-cure resin cement

Cited by 61 publications

References 20 publications

Influence of post types and sizes on fracture resistance in the immature tooth model

Influence of post types and sizes on fracture resistance in the immature tooth model

Microhardness of luting agents used for fiber post cementation submitted to thermo cycling

Measurement of Elastic Modulus and Vickers Hardness of Surround Bone Implant Using Dynamic Microindentation - Parameters Definition

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