Effect of Ferrule Designs on Stresses of Endodontically Treated Teeth Restored with Pressed Ceramics

2013 ◽  
Vol 404 ◽  
pp. 158-163
Author(s):  
Liliana Porojan ◽  
Florin Topală ◽  
Sorin Porojan
Keyword(s):  
3D Models ◽  
Endodontically Treated Teeth ◽  
Element Analysis ◽  
Maxillary Central Incisor ◽  
Tooth Structure ◽  
Anterior Teeth ◽  
Maximal Stress ◽  
Post And Core ◽  
Von Mises ◽  
Resistance Form

Due to substantial loss of coronal tooth structure, corono-radicular stabilization is often required, especially in anterior teeth to provide retention and resistance form for the restoration. The use of ferrule as a part of the artificial crown was proposed in reinforcing the root-filled teeth. The purpose of this study was to investigate the effect of the ferrule height on stresses induced in an endodontically treated maxillary central incisor, which was restored with pressed ceramics, using numerical analysis. The study was developed for in order to obtain 3D models, for the design of the prepared teeth, pressed ceramics post and core systems and crowns. The use of ferrule as a part of the core was proposed in reinforcing and therefore six levels of the ferrule height were designed in order to be investigated. The study was performed on a central upper incisor, using a finite element analysis. Von Mises equivalent stresses were calculated and their distribution was plotted graphically. Regarding stress distribution in the crown high stresses are present cervical. In the prepared root stresses are under the finishing line and in the post cervical. In the post, with the increase of the ferrule height, the stresses move in coronal direction. No significant differences were found between the maximal stress values for the studied preparation designs (a ferrule height between 1 and 6mm).

Numerical Simulation of the Occlusal Contacts in Roots Restored with Complete Ceramic Materials

2013 ◽  
Vol 404 ◽  
pp. 152-157
Author(s):  
Liliana Porojan ◽  
Florin Topală ◽  
Sorin Porojan
Keyword(s):  
High Strength ◽  
Ceramic Materials ◽  
3D Models ◽  
Fracture Pattern ◽  
Element Analysis ◽  
Core System ◽  
Maxillary Central Incisor ◽  
All Ceramic ◽  
Abutment Teeth ◽  
Post And Core

Different high-strength, all-ceramic restorative systems are available for the restoration of endodontically treated roots. To date, many studies on fracture strength and fracture pattern have been conducted. Most of these studies focused on investigating stress distribution in the root dentin of abutment teeth restored with a post and core system. The objective of this study was to evaluate, by means of the finite element analysis, stresses induced in an endodontically treated maxillary central incisor that was restored with different all-ceramic systems during contacts with the antagonists. The first step of the study was to achieve 3D models in order to design and analyze teeth, all ceramic post and core systems and pressed ceramic crowns. Stress analysis was performed on the restored incisor during protrusion. As post and core materials pressed ceramics and zirconia were chosen, and for the full crown pressed ceramics was selected. Maximal equivalent stresses were recorded in the tooth structures and in the restorations for all contact areas. In the zirconia post and core systems stresses were higher than in the pressed ceramics post and core systems. The use of zirconia posts with a higher modulus of elasticity than pressed ceramics induce lower stresses in the dentin and higher in the crown than pressed ceramics posts.

scholarly journals Finite elements study of the Flexi Post and Flexi Flange post systems in a maxillary central incisor

2003 ◽  
Vol 17 (2) ◽  
pp. 132-136 ◽  
Author(s):  
Hugo Roberto Lewgoy ◽  
Michel Nicolau Youssef ◽  
Maurício Rufaiel Matson ◽  
Jorge Antônio Javier Saldivar Bocangel ◽  
Camillo Anauate Netto ◽  
...  
Keyword(s):  
Resin Cement ◽  
Core Material ◽  
Central Incisor ◽  
The Finite Element Method ◽  
Endodontically Treated Teeth ◽  
Human Teeth ◽  
Maxillary Central Incisor ◽  
Pattern Distribution ◽  
Post And Core ◽  
Von Mises

The use of post and core systems has become an excellent alternative for restoring endodontically treated teeth. The aim of this study was to evaluate the von Mises, maximal compressive and tensile stresses distribution using the Finite Element Method (FEM) on human teeth restored with different post and core systems. The analysis was made on endodontically treated maxillary central incisors. The post systems used in this investigation were the stainless steel or titanium Flexi Post/Flexi Flange. Composite resin was used as core material and resin cement was the cement material of choice to seat a full porcelain crown. The bi-dimensional mathematical model was created from pictures taken from an intact human maxillary central incisor and prefabricated posts. This image was transferred to a personal computer in the MSC/Nastran 4.5 software. A static and linear analysis treatment was performed when a 45º load of 100 N was applied on the lingual surface of the tooth. Based on the results obtained, it can be concluded that the post design and its material can alter the stress pattern distribution.

scholarly journals EVALUATION OF DIFFERENT TYPES OF CROWNS USED FOR RESTORATION OF ENDODONTICALLY TREATED TEETH

2019 ◽  
Vol 3 (11) ◽  
Author(s):  
Dr. Shivangi Shreya
Keyword(s):  
Resin Composite ◽  
Treatment Plan ◽  
Dental Arch ◽  
Endodontically Treated Teeth ◽  
Tooth Structure ◽  
Anterior Teeth ◽  
Custom Made ◽  
Different Types ◽  
Post And Core ◽  
The Aesthetic

Endodontically treated teeth (ETT) have been problematic in most cases as a result of dental caries, fractures, previous restorations and endodontic procedures. Several post system techniques and materials are currently used to build up ETT with moderate or severe loss of coronal tooth structure and to retain final restorations. Following root filling, the custom-made cast metallic post and core with metal-ceramic crowns was the traditional restoration of choice, but this has changed. The patients’ primary motivation for seeking superior dental aesthetics, particularly in the anterior aesthetic zone, has prompted the development of non-metallic restorations. Several new types of polymeric and more aesthetic quartz and glass-fibres posts, combined with direct resin composite cores, provide an aesthetic foundation for an all-ceramic crown and have overcome the aesthetic limitations of metallic posts and cores in the anterior teeth. Until recently, there has been controversy in the dental community regarding which material or technique is the most favourable for the restoration of ETT. It seems that the amount and retentive capacity of the remaining tooth structure, the position of the tooth in the dental arch, the functional or para-functional loading on the tooth, and the treatment plan to restore aesthetics and function all influence the selection of the most appropriate post system for each case.  Hence the present study was planned for Evaluation of Different Types of Crowns Used For Restoration Of Endodontically Treated Teeth. The present study was planned in Department of Conservative Dentistry and Endodontics, Buddha Institute of Dental Science and Hospital, Patna, Bihar, India. The 40 cases of maxillary anterior endodontically treated teeth (ETT). The roots were restored with reinforced GFPs (Relaxy Fiber Post, 3M ESPE, Germany), and composite resin cores (Tertic-N-Ceramic, Ivoclar Vivadent, Lichenestine). The survival of ETT is contingent on the residual sound tooth structure that remains after the endodontic access and caries removal are performed consequently the most important factors upon restoring ETT become the maximum preservation and conservation of enamel, dentin and the dentinoenamel junction. Hence, bonded partial restorations are always preferred over full coverage cementable crowns. More clinical studies comparing adhesive crowns bonded to postless build-ups or post and -core build-ups are needed for a better understanding of postless approaches in biomimetic restorative dentistry. Keywords: Endodontically treated teeth, Crown, cores, post, etc.

scholarly journals Fractographical Analysis and Biomechanical Considerations of a Tooth Restored With Intracanal Fiber Post: Report of the Fracture and Importance of the Fiber Arrangements

2016 ◽  
Vol 41 (5) ◽  
pp. E149-E158 ◽  
Author(s):  
VF Wandscher ◽  
CD Bergoli ◽  
IF Limberger ◽  
TP Cenci ◽  
P Baldissara ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Glass Fiber ◽  
Shear Stresses ◽  
Fiber Post ◽  
Element Analysis ◽  
Parallel Fibers ◽  
Tooth Structure ◽  
Anterior Teeth ◽  
Compressive Stresses

SUMMARY Objective: This article aims to present a fractographic analysis of an anterior tooth restored with a glass fiber post with parallel fiber arrangement, taking into account force vectors, finite element analysis, and scanning electron microscopy (SEM). Methods: A patient presented at the Faculty of Dentistry (Federal University of Santa Maria, Brazil) with an endodontically treated tooth (ETT), a lateral incisor that had a restorable fracture. The treatment was performed, and the fractured piece was analyzed using stereomicroscopy, SEM, and finite element analysis. Results: The absence of remaining coronal tooth structure might have been the main factor for the clinical failure. We observed different stresses actuating in an ETT restored with a fiber post as well as their relationship with the ultimate fracture. Tensile, compression, and shear stresses presented at different levels inside the restored tooth. Tensile and compressive stresses acted together and were at a maximum in the outer portions and a minimum in the inner portions. In contrast, shear stresses acted concomitantly with tensile and compressive stresses. Shear was higher in the inner portions (center of the post), and lower in the outer portions. This was confirmed by finite element analysis. The SEM analysis showed tensile and compression areas in the fiber post (exposed fibers=tensile areas=lingual surface; nonexposed fibers=compression areas=buccal surface) and shear areas inside the post (scallops and hackle lines). Stereomicroscopic analysis showed brown stains in the crown/root interface, indicating the presence of microleakage (tensile area=lingual surface). Conclusion: We concluded that glass fiber posts with parallel fibers (0°), when restoring anterior teeth, present a greater fracture potential by shear stress because parallel fibers are not mechanically resistant to support oblique occlusal loads. Factors such as the presence of remaining coronal tooth structure and occlusal stability assist in the biomechanical equilibrium of stresses that act upon anterior teeth.

scholarly journals Introduction to Fiber Reinforced Composite (FRC) Post, A New Era in Reinforcing Esthetics: A Case Report

2013 ◽  
Vol 3 (1) ◽  
pp. 45-48
Author(s):  
CM Jan ◽  
F Rashid ◽  
NA Nomann ◽  
AJ Rashid
Keyword(s):  
Root Canal ◽  
Significant Loss ◽  
Fiber Reinforced ◽  
Endodontically Treated Teeth ◽  
New Era ◽  
Fiber Reinforced Composite ◽  
Maxillary Central Incisor ◽  
Tooth Structure ◽  
Reinforced Composite ◽  
Endodontically Treated Tooth

The restoration of a root canal treated or, endodontically treated teeth, is often can be achieved with post and core because of the significant loss of tooth structure. Until the mid-1980s, the safest way to restore an endodontically treated tooth was considered to be the cast-metal post, made indirectly by a dental technician. Also prefabricated metal posts in combination with different core materials under artificial crowns were used. The development and use of fiber reinforced composite (FRC) root canal posts over metallic posts make possible of the attachment & reinforcement of the crown with maximum esthetics. This paper illustrates a technique for rehabilitation of an endodontically treated maxillary central incisor of both sides (UL1 & UR1) with a fiber reinforced composite post (FRC post) & discusses the advantages, disadvantages of metallic post over fiber reinforced composite (FRC) posts.DOI: http://dx.doi.org/10.3329/bjdre.v3i1.16595 Bangladesh Journal of Dental Research & Education Vol.3(1) 2013: 45-48

scholarly journals A finite element analysis for a comparative evaluation of stress with two commonly used esthetic posts

2013 ◽  
Vol 07 (04) ◽  
pp. 419-422 ◽  
Author(s):  
Prajna P. Shetty ◽  
Roseline Meshramkar ◽  
Konark N. Patil ◽  
Ramesh K. Nadiger
Keyword(s):  
Finite Element ◽  
Glass Fibre ◽  
Elastic Moduli ◽  
Alveolar Bone ◽  
Element Model ◽  
Endodontically Treated Teeth ◽  
Element Analysis ◽  
Tooth Structure ◽  
Homogenous Distribution ◽  
Distribution Of Stress

ABSTRACT Objectives:The objective of this study was to evaluate stress distribution in the dentin and alveolar bone created by load application on simulated endodontically treated teeth with two different esthetic posts. Materials and Methods: A finite element model was made and elastic moduli and poissons ratio of all the materials fed to the software. For both the models, a 100N force was applied on the lingual surface of the tooth at an angle of 45°. Stress concentration and distribution were evaluated and noted down for both the posts. Results: Finite element method revealed that Glass fibre post had homogenous distribution of stress whereas in zirconia post the stress was concentrated in the post.Conclusion :The present findings suggest that glass fibre post should be used in well-conserved radicular tooth structure and Zirconia post is indicated in weakened and grossly destructed tooth structure.

scholarly journals Esthetic Rehabilitation of Mutilated Anterior Teeth with Custom Cast Post and Core Porcelain-Fused-to-Metal Crowns

2015 ◽  
Vol 4 (1) ◽  
pp. 69-71
Author(s):  
Dinesh Kumar Saini ◽  
Virender Singh Legha
Keyword(s):  
Endodontic Treatment ◽  
Anterior Tooth ◽  
Coronal Structure ◽  
Tooth Structure ◽  
The Core ◽  
Anterior Teeth ◽  
Post And Core

ABSTRACT An endodontically treated anterior tooth requires extracoronal restoration when the tooth structure is weakened or lost due to caries, endodontic treatment, placement of previous restorations and/or is discolored. The reduced tooth structure makes retention of extracoronal restoration difficult. The purpose of post is to provide retention for the core restoration, which replaces lost coronal structure. This article describes restoration of mutilated maxillary central incisors by using cast post and core, followed with porcelain fused to metal restorations. How to cite this article Legha VS, Saini DK, Kumar KVA. Esthetic Rehabilitation of Mutilated Anterior Teeth with Custom Cast Post and Core Porcelain-Fused-to-Metal Crowns. Int J Experiment Dent Sci 2015;4(1):69-71.

Influence of Dental Implant Design on Stress Distribution and Micromotion of Mandibular Bone

2020 ◽  
Vol 899 ◽  
pp. 81-93
Author(s):  
Nur Faiqa Ismail ◽  
M. Saiful Islam ◽  
Solehuddin Shuib ◽  
Rohana Ahmad ◽  
M. Amar Shahmin
Keyword(s):  
Shear Stress ◽  
Dental Implant ◽  
Cancellous Bone ◽  
3D Models ◽  
Von Mises Stress ◽  
Implant Design ◽  
Element Analysis ◽  
Reconstruction Process ◽  
Mandibular Bone ◽  
Von Mises

This research was conducted to provide a feasible method for reconstructing the 3D model of mandibular bone to undergo finite element analysis to investigate von Mises stress, deformation and shear stress located at the cortical bone, cancellous one and neck implant of the proposed dental implant design. Dental implant has become a significant remedial approach but although the success rate is high, the fixture failure may happen when there are insufficient host tissues to initiate and sustain the osseointegration. Computerised Tomography scan was conducted to generate head images for bone reconstruction process. MIMICS software and 3-matic software were used to develop the 3D mandibular model. The reconstructed mandibular model was then assembled with five different 3D models of dental implants. Feasible boundary conditions and material properties were assigned to the developed muscle areas and joints. The highest performance design with the best responses was the design B with the value for the von Mises stress for the neck implant, cortical and cancellous bone were 7.53 MPa, 16.91 MPa and 1.34 MPa respectively. The values for the maximum of micromotion for the neck implant, cortical and cancellous bone of design B were 20.60 μm, 21.17 μm and 5.83 μm respectively. Shear stress for neck implant, cortical and cancellous bone for this design were 0.15 MPa, 4.74 MPa and 1.54 MPa respectively. The design with a cone shaped hole which is design B was the proper design when compared with other designs in terms of von Misses stress, deformations and shear stress.

scholarly journals Study of the Stress Distribution Around the Mini-implant During Maxillary Anterior Intrusion Under Different Conditions: A 3-Dimensional Finite Element Analysis

2020 ◽  
Vol 54 (2) ◽  
pp. 106-114
Author(s):  
Udita Thakkar ◽  
Neeraj S. Patil ◽  
Ajay P. Thakkar ◽  
Shrikant S. Chitko ◽  
Pratik Jaltare
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Root Resorption ◽  
Von Mises Stress ◽  
Element Analysis ◽  
Deep Bite ◽  
Anterior Teeth ◽  
Dimensional Finite Element ◽  
Von Mises

Introduction: Correction of deep bite is one of the major challenges of orthodontic treatment. Mini-implants provide stable intra-oral anchorage and facilitate the maxillary incisors to be intruded without the usual side. The purpose of this finite element study was to evaluate the stress distribution around the mini-implant during maxillary anterior intrusion under different conditions of different angulations and different positions of implant. Material and Methods: Finite element analysis was carried out. Stress under the following 4 conditions was analyzed: (a) single central implant placed at 90°, (b) single central implant placed at 120°, (c) bilaterally placed implant at 90°, and (d) bilaterally placed implant at 120°. Results: The displacement seen with 90° angulation in the single implant case is less compared with the 120° angulation case for all the 6 maxillary anterior teeth. Also, in the bilateral implant case, the Von Mises stress is less when the 90° angulation case is compared to 120° angulation case. But in bilaterally placed implant, the stress gets distributed evenly in the anterior region. The stress in 90° angulation cases seems to be concentrated at the center. Conclusion: Stresses measured on the teeth are less and distributed more evenly when the point of force application is bilateral. It was also observed that the stress increases with increase in the angulation of the implant. As the contact between the implant and the bone increases, the stability increases. Hence, the implant should be obliquely inserted into the bone. Concentrated stresses are not favorable as they can increase the risk of bone and root resorption.

scholarly journals Concepts and Perception of Restoring Endodontically Treated Teeth among Dental Practitioners in Western Region of Saudi Arabia- A Questionnaire Based Study

2021 ◽  
Author(s):  
Karunakar Shetty ◽  
Sara Abdulrhman Shugair ◽  
Ghada Saad Alshohaib ◽  
Riham Zamil Abulhamayel ◽  
Sara Taleb Alshawa ◽  
...  
Keyword(s):  
General Practice ◽  
Saudi Arabia ◽  
General Practitioners ◽  
Western Region ◽  
Endodontically Treated Teeth ◽  
Tooth Structure ◽  
Fiber Posts ◽  
Reduced Modulus ◽  
Dental Practitioners ◽  
Post And Core

Introduction: Endodontically Treated Teeth (ETT) are most likely to get fractured, if it is left unrestored compared with the vital teeth due to the loss of tooth structure and reduced modulus of elasticity. Aim: To gain insight into the rationale for choice of endodontic posts and the different endodontic post systems currently used by dental practitioners in western region of Saudi Arabia. Materials and Methods: For this survey-based study, a questionnaire was designed consisting of eight questions to assess the details of why, when and how general practitioners restore ETT and to determine contemporary use of endodontic post from 1st of November 2018 till the end of January 2019. This questionnaire was sent online to 250 private dental practitioners in western region of Saudi Arabia, out of which 202 participants responded. Data was entered in the excel sheet. Descriptive statistics like frequency and proportion was calculated for qualitative data. Results: This study included 202 participants with the mean age group of 25-50 years, out of which 108 (53.4%) male participants and 94 (46.5%) female participants. 120 (59%) of the study sample were general practitioners and 82 (41%) of them were specialists. A total of 60 (29.70) of the study sample were into general practice, reported restoring ETT with post and core followed by the crown, whereas, 30 (14.85%) of them did the crown without post, 15 (7.42%) of them completed restoration with composite and 15 (7.42%) of them did build-up with post and core. An 82 (40.59%) of the study sample who were specialists, reported restoring ETT with post and core build-up and then proceed with crowns. An 80 (39.60%) of the study sample were into general practice, reported using prefabricated fiber post whereas, 23 (11.38%) of them using cast post and 17(8.41%) of them using prefabricated metal posts. 72 (35.64%) of the study sample were specialists reported using prefabricated fiber posts and 10 (4.95%) of them used cast metal post. Conclusion: Based on the results of the study, it can be concluded that majority of the participants practiced reinforcement of ETT by using fiber posts with resin cements followed by crowns.

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