Biomechanical considerations for the restoration of endodontically treated teeth: A systematic review of the literature, Part II (Evaluation of fatigue behavior, interfaces, and in vivo studies)

Department of Cariology and Endodontics, School of Dentistry, University of Geneva, Geneva, Switzerland.
Quintessence international (Berlin, Germany: 1985) (Impact Factor: 0.73). 03/2008; 39(2):117-29.
Source: PubMed

ABSTRACT OBJECTIVE: The restoration of endodontically treated teeth has long been guided by empirical rather than biomechanical concepts. Part I of this literature review presented up-to-date knowledge about changes in tissue structure and properties following endodontic therapy, as well as the behavior of restored teeth in monotonic mechanical tests or finite element analysis. The aim of the second part is to review current knowledge about the various interfaces of restored, nonvital teeth and their behavior in fatigue and clinical studies. REVIEW METHOD: The basic search process included a systematic review of articles contained in the PubMed/Medline database, dating between 1990 and 2005, using single or combined key words to obtain the most comprehensive list of references; a perusal of the references of the references completed the review. RELEVANT INFORMATION AND CONCLUSIONS: Nonvital teeth restored with composite resin or composite resin combined with fiber posts resisted fatigue tests and currently represent the best treatment option. In comparison to rigid metal and/or ceramic posts, when composite resin or composite resin/fiber posts fail, the occurrence of interfacial defects or severe tooth breakdown is less likely. Adhesion into the root, however, remains a challenge because of the unfavorable ovoid canal configuration, as well as critical dentin microstructure in the deepest parts of the canal. Thus, specific combinations of adhesives and cements are recommended. The clinical performance of post-and-core restorations proved satisfactory overall, in particular with a contemporary restorative approach using composite resin and fiber posts. However, the clinical literature does not clearly isolate or identify exact parameters critical to success. This, in turn, emphasizes the importance and relevance of in vitro studies to further improve the quality and long-term stability of prosthetic foundations.

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    • "In recent years, the prefabricated fiber-reinforced composite post has become popularly used for the direct post and core restoration due to their good esthetics and relatively low elastic modulus.1,2,3,4 The combination of fiber-reinforced composite post and composite resin core produced the lower stress concentration in any part of the restored endodontically treated teeth when compared with other post and core materials,5 resulting in a lower incident of root fracture. "
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    ABSTRACT: PURPOSE This study evaluated the depth of cure of resin composite cured by light through a translucent fiber post. MATERIALS AND METHODS The opaque plastic tubes in various lengths of 2, 4, 6, 8, 10, 12, 14 mm. were filled with resin composite in which two different translucent fiber posts were inserted into the center and photo-polymerized for 40 seconds. The degree of conversion of the cured composite at bottom surface were examined using Fourier transform infrared attenuated total reflection spectrometer (FTIR/ATR) at 0.1, 0.5 and 1.0 mm apart from the post surface. RESULTS The degree of conversion of the 0.1 mm, 0.5 mm, 1.0 mm apart from the post surface was highest at the 2 mm level and continuously decreased when the distance from the light source was increased and drastically decreased when the depth from the top of the post was greater than 4-6 mm. For each level, the highest degree of conversion was at 0.1 mm from the post surface and decreased continuously when the distance apart from the post surface was increased. CONCLUSION The quantity of light transmission depends on the type of post and the light transmission capability of the post, especially after 4-6 mm depth and the area further apart from the post surface, are insufficient for clinical light activation of resin composite.
    The journal of advanced prosthodontics 06/2014; 6(3):194-9. DOI:10.4047/jap.2014.6.3.194 · 0.64 Impact Factor
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    • "From a mechanical point of view, a post/core/crown restored tooth can be considered a structure formed by multiple components with a complex geometry [20]. Clinically, the failure of these restorative systems will occur in the form of root fracture or post dislodgement [21] [22] [23]. "
    10th World Congress on Computational Mechanics; 05/2014
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    • "A successful endodontic treatment has to be complemented with an appropriate postendodontic restoration to integrate the pulpless tooth with the masticatory apparatus [4]. When up to one half of the coronal tooth structure is missing, complete occlusal coverage is achieved conservatively using endocrown [5]. "
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    ABSTRACT: Clinical success of endodontically treated posterior teeth is determined by the postendodontic restoration. Several options have been proposed to restore endodontically treated teeth. Endocrowns represent a conservative and esthetic restorative alternative to full coverage crowns. The preparation consists of a circular equigingival butt-joint margin and central retention cavity into the entire pulp chamber constructing both the crown and the core as a single unit. The case reports discussed here are moderately damaged endodontically treated molars restored using all ceramic endocrowns fabricated using two different systems, namely, CAD/CAM and pressed ceramic.
    12/2013; 2013:210763. DOI:10.1155/2013/210763
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