A comparative evaluation of fracture resistance of endodontically treated teeth restored with different post core systems-An in-vitro study

Department of Conservative Dentistry, VSPM's Dental College and Research Centre Nagpur, Maharashtra, India.
The journal of advanced prosthodontics (Impact Factor: 0.64). 06/2011; 3(2):90-5. DOI: 10.4047/jap.2011.3.2.90
Source: PubMed


To compare the fracture resistance and the mode of failure of endodontically treated teeth restored with different post-core systems.
Root canal treatment was performed on 40 maxillary incisors and the samples were divided into four groups of 10 each. For three experimental groups post space preparation was done and teeth were restored with cast post-core (Group B), stainless steel post with composite core (Group C) and glass fiber post with composite core using adhesive resin cement (Group D). Control group (A) samples were selected with intact coronal structure. All the samples were prepared for ideal abutment preparation. All the samples were subjected to a load of 0.5 mm/min at 130° until fracture occurred using the universal testing machine. The fracture resistance was measured and the data were analyzed statistically. The fracture above the embedded resin was considered to be favorable and the fracture below the level was considered as unfavorable. The statistical analysis of fracture resistance between different groups was carried out with t-test. For the mode of failure the statistical analysis was carried out by Kruskal-Wallis test and Chi-Square test.
For experimental group Vs control group the fracture resistance values showed significant differences (P<.05). For the mode of failure the chi-square value is 16.1610, which means highly significant (P=.0009) statistically.
Endodontically treated teeth without post core system showed the least fracture resistance demonstrating the need to reinforce the tooth. Stainless steel post with composite core showed the highest fracture resistance among all the experimental groups. Teeth restored with the Glass fiber post showed the most favorable fractures making them more amenable to the re-treatment.

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Available from: Pravinkumar Patil, Oct 09, 2015
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    • "Fiber posts may act as a distributor of stress applied to the crown [13] [14] [15] [16] and the whole tooth restoration will be a single unit and can improve fracture strength [10]. Nonetheless, there is little consensus with regard to the fiber post providing real teeth reinforcement [12] [16] [17]. "
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    ABSTRACT: No previous study has tested the strength of teeth restored with a fiber post inside the root canal combined with a ribbon fiber in the crown surrounding the post. The aim of this study was to compare a new adhesive technique to other conventional techniques in the fracture resistance of endodontically treated premolars. Fifty superior premolars were divided into 5 groups (n=10), prepared as follows: Intact teeth used in G1 as control; in the other experimental groups (G2, G3, G4 and G5), mesio-occlusal-distal cavities were prepared, extending toward the palatal cups (MODP), and root canal treatments were performed. Groups were restored by varying the restorative technique: G2–only with composite resin (CR); G3–fiber post+CR; G4- polyethylene fiber (Ribbond)+CR; and G5, Fiber post+Ribbond+CR. The teeth were thermocycled 1000 times. After 24 h, the specimens were loaded in a universal testing machine until fracture, and the failure mode was checked. ANOVA and Tukey-Krammer tests were used for statistical analysis (α=0.05). Results: The fracture strength (N) of control (G1- 410.7±106.9) was not significantly different (P>0.05) from Ribbond+CR (G4- 300.7±80.2) and Fiber post+Ribbond+CR (G5- 377.5±107.7). Specimens restored only with CR (G2- 177.7±52.1) and fiber post+CR (G3- 264.6±88.5) were statistically similar (P>0.05), but both had their mean values differed from the control (P<0.05). Longitudinal and oblique crown fractures were predominant in all groups. Ribbon-fiber reinforced resin restorations provided superior fracture resistance of premolars with MODP and endodontic access cavities when compared to conventional direct techniques.
    International Journal of Adhesion and Adhesives 04/2014; 50. DOI:10.1016/j.ijadhadh.2014.01.030 · 1.77 Impact Factor
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    • "To the best of our knowledge, fracture resistance in teeth treated with a post-core system has only been examined using static loading [2-7, 9, 10, 19-21] or finite element analysis that assumed occlusal force [7, 22]. That is to say, much remains to be clarified regarding the relationship between dynamic loading and traumatic injury. "
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    ABSTRACT: This pilot study compared impact strain at the core and root surfaces between two different post-core systems. The form of a bovine mandibular front tooth was modified to resemble that of a human maxillary incisor as a test specimen. A cast post and core (Metal PC) and composite resin and glass fiber-reinforced epoxy resin post (Fiber-Resin PC) system were tested. Four gauges were affixed to the buccal and lingual surfaces of the core and root. The specimens were then embedded in a metal mold using dental stone. A pendulum-type device with a pyramid-shaped metal impact object with a titanium alloy head was used to provide 2 different shock forces. Maximum distortion was measured and analyzed. Distortion at the core at each measurement point and total amount of distortion with Fiber-Resin PC was significantly greater (p<0.05) than that with Metal PC against both impact forces. On the other hand, distortion at the root at the buccal measurement point with Fiber-Resin PC was significantly less than that with Metal PC against both impact forces. Total distortion was significantly less with Fiber-Resin PC than that with Metal PC against the greater impact shock. Acceleration with Fiber-Resin PC was significantly less than that with Metal PC against both impact forces. Fiber-Resin PC has the potential to protect remaining root against traumatic force. This suggests that a Fiber-Resin PC is more suitable for non-vital teeth against not only occlusal but also traumatic impact force.
    The Open Dentistry Journal 11/2013; 7(1):162-8. DOI:10.2174/1874210601307010162
    • "In addition, fiber posts produce an elastic modulus similar to dentin, resulting in homogeneous stress distribution along the root canal system. As a result, fiber post minimizes the risk of root fractures or lead to more favorable fracture mode than metallic posts.[1234] "
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    ABSTRACT: The aim of this study was to investigate the effect of phosphoric acid etching and the dentin pre-treatment with sodium hypochlorite (NaOCl) on the push-out bond strength between fiber post and root canal dentin. Root canals of 48 human incisors were selected, post spaces were prepared and assigned to four groups: G1-37% phosphoric acid (15 s); G2-5.25% NaOCl (2 min) +37% phosphoric acid (15 s); G3-37% phosphoric acid (60 s); and G4-5.25% NaOCl (2 min) +37% phosphoric acid (60 s). Fiber post cementation was performed with two-step etch-and-rinse adhesive system/dual-cured resin cement according to the manufacturer's recommendation. After 24 h, each root was sectioned transversally into three slices (cervical, middle and apical) and the bond strength of each section was determined using a push-out bond strength test. Morphology analysis of the bonded interface was evaluated using a scanning electron microscopy. Push-out strength data (MPa) were analyzed by Analysis of Variance and Tukey-Kramer (α = 0.05). Considering the NaOCl pre-treatment, no statistically significant differences were observed among groups; however, when the phosphoric acid was applied during 60 s in the apical portion without NaOCl pre-treatment, the bond strength was statistically significant increased. The NaOCl pre-treatment did not improve the bond strength of adhesive luting cement to root canal dentin. The findings suggest that the use of 37% phosphoric acid for 60 s may have a beneficial effect on bond strength in the apical root third.
    03/2013; 4(4):443-447. DOI:10.4103/0976-237X.123022
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