Stress distribution on endodontic post, gutta-percha, and dentin with different post materials

2016 ◽  
pp. 237-240
Keyword(s):  
Stress Distribution ◽  
Gutta Percha

scholarly journals Comparative Evaluation of Stress developed on Rotary Retreatment Instruments during Retrieval of Gutta-percha

2017 ◽  
Vol 18 (6) ◽  
pp. 484-489 ◽  
Author(s):  
Sushmita Shivanna ◽  
Dhanasekaran Sihivahanan ◽  
T Vinay Kumar Reddy ◽  
Anchu Rachel Thomas ◽  
Natarajan Senthilnathan ◽  
...  
Keyword(s):  
Stress Distribution ◽  
Comparative Evaluation ◽  
Structural Characteristics ◽  
Three Dimensional ◽  
Element Analysis ◽  
Basic Model ◽  
Gutta Percha ◽  
Group I

ABSTRACT Aim The aim of the study is to compare the maximum stress distribution on the rotary retreatment instruments within the root canal at cervical, middle, and the apical one-third during retreatment of gutta-percha. Materials and methods A human mandibular premolar was scanned, and three-dimensional geometry of the root was reconstructed using finite element analysis (FEA) software package (ANSYS). The basic model was kept unchanged; tooth models were created using the same dimensions and divided into two groups as follows: Group I: ProTaper Universal retreatment system and group II: Mtwo rotary retreatment system. The stress distribution on the surface and within the retreatment files was analyzed numerically in the FEA package (ANSYS). Results The FEA analysis revealed that the retreatment instruments received the greatest stress in the cervical third, followed by the apical third and the middle third. The stress generated on the ProTaper Universal retreatment system was less when compared with the Mtwo retreatment files. Conclusion The study concludes that the retreatment instruments undergo higher stress in the cervical third region, and further in vivo and in vitro studies are necessary to evaluate the relationship between instrument designs, stress distribution, residual stresses after use, and the torsional fracture of the retreatment instrument. Clinical significance The stress developed on the rotary retreatment instruments during retrieval of gutta-percha makes the instrument to get separated. There is no instrument system, i.e., suitable for all clinical situations and it is important to understand how the structural characteristics could influence the magnitude of stresses on the instrument to prevent its fracture in use. How to cite this article Sihivahanan D, Reddy TVK, Thomas AR, Senthilnathan N, Sivakumar M, Shivanna S. Comparative Evaluation of Stress developed on Rotary Retreatment Instruments during Retrieval of Gutta-percha. J Contemp Dent Pract 2017;18(6):484-489.

Determining the Optimum Material for an Endodontic Prefabricated Parallel Post Using a Sub-Problem Approximation Method

2016 ◽  
Vol 26 ◽  
pp. 28-44
Author(s):  
Wasim M.K. Helal ◽  
Dong Yan Shi
Keyword(s):  
Stress Distribution ◽  
Approximation Method ◽  
Treatment Process ◽  
Gold Alloy ◽  
Current Investigation ◽  
Element Analysis ◽  
Gutta Percha ◽  
The Finite Element Analysis ◽  
Optimum Material ◽  
Elastic Characteristics

One of the most widely used techniques in present-day in order to save teeth is endodontic treatment (ET). Nowadays, a post or a dowel is widely used in the tooth treatment process. The aims of the current investigation are to: (1) evaluate the stress distribution surrounding the endodontic prefabricated parallel post (EPPP), gutta-percha, and dentin with six types of post materials, and (2) determine the optimum material of an EPPP. Six post materials: (1) carbon fibre post (CFP), (2) gold (G), (3) gold alloy (GA), (4) titanium (T), (5) titanium alloy (TA), and (6) stainless steel (SS) were selected in the present work. In order to evaluate the stress distribution surrounding the EPPP, gutta-percha, and dentin with different post materials, the finite element analysis (FEA) is adopted. After that, the sub-problem approximation method was used in order to investigate the optimum material of an EPPP. The results obtained indicate that the optimum elastic characteristics for the EPPP, elastic modulus (E), and Poisson’s ratio (υ) equal to 185 GPa and 0.245, respectively.

The concerted use of SEM, TEM, and SCM for examination of resin-dentin interfaces

1994 ◽  
Vol 52 ◽  
pp. 476-477
Author(s):  
B. Van Meerbeek ◽  
L. J. Conn ◽  
E. S. Duke
Keyword(s):  
Surface Layer ◽  
Stress Distribution ◽  
Phosphoric Acid ◽  
Bonding Mechanism ◽  
Restorative Dentistry ◽  
Dental Adhesive ◽  
Low Viscosity ◽  
Dentin Adhesives ◽  
Acid Etch ◽  
Tooth Tissue

Restoration of decayed teeth with tooth-colored materials that can be bonded to tooth tissue has been a highly desirable property in restorative dentistry for many years. Advantages of such an adhesive restorative technique over conventional techniques using non-adhesive metal-based restoratives include improved restoration retention with minimal sacrifice of sound tooth tissue for retention purposes, superior adaptation and sealing of the restoration margins in prevention of caries recurrence, improved stress distribution across the tooth-restoration interface throughout the whole tooth, and even reinforcement of weakened tooth structures. The dental adhesive technology is rapidly changing. An efficient resin bond to enamel has already long been achieved. Its bonding mechanism has been fully elucidated and has proven to be a durable and reliable clinical treatment. However, bonding to dentin represents a greater challenge. After the failures of a dentin acid-etch technique in imitation of the enamel phosphoric-acid-etch technique and a bonding procedure based on chemical adhesion, modern dentin adhesives are currently believed to bond to dentin by a micromechanical hybridization process. This process is developed by an initial demineralization of the dentin surface layer with acid etchants exposing a collagen fibril arrangement with interfibrillar microporosities that subsequently become impregnated by low-viscosity monomers. Although the development of such a hybridization process has well been documented in the literature, questions remain with respect to parameters of-primary importance to adhesive efficacy.

Vulcanite or gutta-percha? That is the question

1991 ◽  
Vol 22 (5) ◽  
pp. 292-297
Author(s):  
Grahame Brown
Keyword(s):  
Gutta Percha
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