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      A comparative evaluation of the fracture resistance of three different pre-fabricated posts in endodontically treated teeth: An in vitro study

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          Abstract

          Aims:

          To compare the fracture resistance and primary mode of failure of three different pre- fabricated posts like stainless steel, carbon fiber and ceramic posts in endodontically treated crowned permanent maxillary central incisors.

          Materials and Methods:

          Root canal treatment was performed on all 30 maxillary central incisors. Post space was prepared and samples were divided into three groups of 10 each. The teeth were inserted with pre-fabricated stainless steel, carbon fiber and ceramic post and cemented using adhesive resins, core fabricated and crowns placed. Mode of failure was carried out by immersing the teeth in black ink for 12 h and then sectioning them mesio-distally. Fracture above the embedded resin was considered favorable and fracture below the resin level was considered unfavorable.

          Statistical Analysis:

          Fracture strength was measured using a universal testing machine. Data were evaluated statistically using the Kruskal Wallis test and the Mann Whitney “U”-test. Mode of failure was evaluated statistically using the chi-square test.

          Results:

          There was a statistically significant difference showing that the stainless steel post had a better fracture resistance when compared with the other two posts and the carbon fiber showed a statistically more favorable fracture when compared with the other two posts.

          Conclusions:

          Within the limitations of this study, it can be concluded that the pre-fabricated stainless steel post exhibited a significantly higher fracture resistance at failure when compared with the carbon fiber post and the ceramic post. The mode of failure of the carbon fiber post was more favorable to the remaining tooth structure when compared with the pre-fabricated stainless steel post and the ceramic post.

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          Most cited references24

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          Post placement and restoration of endodontically treated teeth: a literature review.

          The restoration of endodontically treated teeth is a topic that is extensively studied and yet remains controversial from many perspectives. This article reviews the major pertinent literature on this topic, with an emphasis on major decision-making elements in post placement and restoration of endodontically treated teeth. Recommendations are made for treatment planning, materials, and clinical practices from restorative and endodontic perspectives.
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            Comparison of the fracture resistances of pulpless teeth restored with a cast post and core or carbon-fiber post with a composite core.

            The survival of pulpless teeth restored with a post and core system is a controversial issue. This study compared the fracture resistance of 2 types of restorations: teeth restored with prefabricated carbon-fiber posts and composite cores to cast dowel-core restored teeth. A total of 44 recently extracted sound premolars were randomly distributed into 2 equal groups: group I, restored with prefabricated carbon-fiber post and a composite core; and group II, with custom-cast type III gold alloy post and cores. The size and shape of the posts were identical in the 2 groups. All teeth were fully covered with a nonprecious cast crown. Fracture resistance was measured by applying a point force at 45 degrees to the long angle of the tooth. Mean fracture threshold was 103.7 +/- 53.1 kg for group I versus 202.7 +/- 125.0 kg for group II (differences significant with P = .003). In group II, however, fracture nearly always affected the tooth itself, whereas in group I, the post-core nearly always failed first. Significantly higher fracture thresholds were recorded for the cast post and core group. Teeth restored with cast posts typically showed fracture of the tooth, although at loads rarely occurring clinically.
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              Factors affecting the fracture resistance of post-core reconstructed teeth: a review.

              This article presents a review of the literature on factors that affect the resistance to fracture of post-core reconstructed teeth. Articles cited in a MEDLINE search were obtained from the journals and reviewed with respect to factors affecting fracture resistance of post-core reconstructed teeth. A large part of the literature reviewed emphasizes the stress distribution during insertion of posts and during function. Other factors, like post length, post diameter, amount of remaining dentin, post material, post adaptability, post design, cement, core material, core and crown design, biocompatibility of post material, use of treated tooth, and load experienced by restored tooth, are also found to influence the fracture resistance of a reconstructed tooth. Of all the factors enumerated, crown design, occlusal forces, and use of the treated tooth are found to have direct impact on the longevity of the restored tooth. Literature indicates that (1) preservation of tooth structure is a must; (2) posts should not be used with the intention of reinforcing the tooth; (3) review of functional and parafunctional forces must be undertaken before restoring the tooth, as these will influence the prognosis; and (4) controlled prospective clinical studies evaluating each factor should be undertaken.
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                Author and article information

                Journal
                J Conserv Dent
                JCD
                Journal of Conservative Dentistry : JCD
                Medknow Publications (India )
                0972-0707
                0974-5203
                Jul-Sep 2010
                : 13
                : 3
                : 124-128
                Affiliations
                Department of Conservative Dentistry, M. R. Ambedkar Dental College, Bangalore, India
                Author notes
                Address for correspondence: Dr. Prabeesh Padmanabhan, Department of Conservative Dentistry, M.R. Ambedkar Dental College, Banglore - 05, India. E-mail: drprabhi@ 123456rediffmail.com
                Article
                JCD-13-124
                10.4103/0972-0707.71642
                2980606
                21116385
                f1befd32-4438-42d7-aa9f-ddb32415cba9
                © Journal of Conservative Dentistry

                This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 13 January 2010
                : 07 March 2010
                : 03 July 2010
                Categories
                Original Article

                Dentistry
                pre-fabricated stainless steel posts,ceramic post,panavia-f,ah-plus sealer,carbon fiber post

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