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• The use of different adhesive filling material and mass combinations to restore class II cavities under loading and shrinkage effects: a 3D-FEA
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  João Paulo Mendes Tribst, Amanda Maria de Oliveira Dal Piva, Pietro Ausiello, Arianna De Benedictis, Marco Antonio Bottino, Alexandre Luiz Souto Borges
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• Stress Concentration of Endodontically Treated Molars Restored with Transfixed Glass Fiber Post: 3D-Finite Element Analysis
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• Computer Aided Design Modelling and Finite Element Analysis of Premolar Proximal Cavities Restored with Resin Composites
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• Effect of Shrinking and No Shrinking Dentine and Enamel Replacing Materials in Posterior Restoration: A 3D-FEA Study
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Apical surgery cuts off the apical root and the crown-to-root ratio becomes unfavorable. Crown-to-root ratio has been applied to periodontally compromised teeth. Apical root resection is a different matter from periodontal bone loss. The purpose of this paper is to review the validity of crown-to-root ratio in the apically resected teeth. Most roots have conical shape and the root surface area of coronal part is wider than apical part of the same length. Therefore loss of alveolar bone support from apical resection is much less than its linear length.The maximum stress from mastication concentrates on the cervical area and the minimum stress was found on the apical 1/3 area. Therefore apical root resection is not so harmful as periodontal bone loss. Osteotomy for apical resection reduces longitudinal width of the buccal bone and increases the risk of endo-perio communication which leads to failure. Endodontic microsurgery is able to realize 0 degree or shallow bevel and precise length of root resection, and minimize the longitudinal width of osteotomy. The crown-to-root ratio is not valid in evaluating the prosthodontic prognosis of the apically resected teeth. Accurate execution of endodontic microsurgery to preserve the buccal bone is essential to avoid endo-perio communication.

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• Influence of Apical Root Resection on the Biomechanical Response of a Single-rooted Tooth—Part 2: Apical Root Resection Combined with Periodontal Bone Loss
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• Influence of Apical Root Resection on the Biomechanical Response of a Single-rooted Tooth: A 3-dimensional Finite Element Analysis
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This study evaluated the influence of the type of restoration and the amount of interdental spacing on the stress distribution in maxillary central incisors restored by means of porcelain laminate veneers and direct composite resin restorations.

Three-dimensional finite element models were fabricated to represent different types of restorations. Four clinical situations were considered. Type I, closing diastema using composite resin. Labial border of composite resin was extended just enough to cover the interdental space; Type II, closing diastema using composite resin without reduction of labial surface. Labial border of composite resin was extended distally to cover the half of the total labial surface; Type III, closing diastema using composite resin with reduction of labial surface. Labial border of the preparation and restored composite resin was extended distally two-thirds of the total labial surface; Type IV, closing diastema using porcelain laminate veneer with a feathered-edge preparation technique. Four different interdental spaces (1.0, 2.0, 3.0, 4.0 mm) were applied for each type of restorations.

For all types of restoration, adding the width of free extension of the porcelain laminate veneer and composite resin increased the stress occurred at the bonding layer. The maximum stress values observed at the bonding layer of Type IV were higher than that of Type I, II and III. However, the increasing rate of maximum stress value of Type IV was lower than that of Type I, II and III.

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• Revamping the Peg Smile: An Art of Rehabilitation of Peg Laterals with Ceramic Veneers and Composite Restorations—A Case Report
  Mahendran Kavitha, Ramdhas Annapurani, Pasupathy Shakunthala, Jayavel Nandhakumar
  Journal of Operative Dentistry & Endodontics.2022; 6(2): 69.     CrossRef
• Minimally Invasive Diastema Restoration with Prefabricated Sectional Veneers
  Claudio Novelli, Andrea Scribante
  Dentistry Journal.2020; 8(2): 60.     CrossRef

The purpose of this study was to evaluate the influence of elastic modulus of restorative materials and the number of interfaces of post and core systems on the stress distribution of three differently restored endodontically treated maxillary second premolars using 3D FE analysis. Model 1, 2 was restored with a stainless steel or glass fiber post and direct composite resin. A PFG or a sintered alumina crown was considered. Model 3 was restored by EndoCrown. An oblique 500 N was applied on the buccal (Load A) and palatal (Load B) cusp. The von Mises stresses in the coronal and root structure of each model were analyzed using ANSYS. The elastic modulus of the definitive restorations rather than the type of post and core system was the primary factor that influenced the stress distribution of endodontically treated maxillary premolars. The stress concentration at the coronal structure could be lowered through the use of definitive restoration of high elastic modulus. The stress concentration at the root structure could be lowered through the use of definitive restoration of low elastic modulus.

Citations

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• How loss of tooth structure impacts the biomechanical behavior of a single-rooted maxillary premolar: FEA
  Roaa Abdelwahab Abdelfattah, Nawar Naguib Nawar, Engy M. Kataia, Shehabeldin Mohamed Saber
  Odontology.2024; 112(1): 279.     CrossRef
• Effect of Proximal Caries-driven Access on the Biomechanical Behavior of Endodontically Treated Maxillary Premolars
  Nawar Naguib Nawar, Roaa Abdelwahab Abdelfattah, Mohamed Kataia, Shehabeldin Mohamed Saber, Engy Medhat Kataia, Hyeon-Cheol Kim
  Journal of Endodontics.2023; 49(10): 1337.     CrossRef
• Survival and success of endocrowns: A systematic review and meta-analysis
  Raghad A. Al-Dabbagh
  The Journal of Prosthetic Dentistry.2021; 125(3): 415.e1.     CrossRef
• Influence of Cavity Design on Stress Distribution in Second Premolar Tooth Using Finite Element Analysis
  Z. Parlar, E.U. Gökçek, K. Yildirim, A. Kahyaoglu
  Acta Physica Polonica A.2017; 132(3-II): 949.     CrossRef
• Influence of post types and sizes on fracture resistance in the immature tooth model
  Jong-Hyun Kim, Sung-Ho Park, Jeong-Won Park, Il-Young Jung
  Journal of Korean Academy of Conservative Dentistry.2010; 35(4): 257.     CrossRef

The purpose of this study was to investigate the effects of four restorative materials under various occlusal loading conditions on the stress distribution at the CEJ of buccal, palatal surface and central groove of occlusal surface of endodontically treated maxillary second premolar, using a 3D finte element analysis.

A 3D finite element model of human maxillary second premolar was endodontically treated. After endodontic treatment, access cavity was filled with Amalgam, resin, ceramic or gold of different mechanical properties. A static 500N forces were applied at the buccal (Load-1) and palatal cusp (Load-2) and a static 170N forces were applied at the mesial marginal ridge and palatal cusp simultaneously as centric occlusion (Load-3). Under 3-type Loading condition, the value of tensile stress was analyzed after 4-type restoration at the CEJ of buccal and palatal surface and central groove of occlusal surface

Excessive high tensile stresses were observed along the palatal CEJ in Load-1 case and buccal CEJ in Load-2 in all of the restorations. There was no difference in magnitude of stress in relation to the type of restorations. Heavy tensile stress concentrations were observed around the loading point and along the central groove of occlusal surface in all of the restorations. There was slight difference in magnitude of stress between different types of restorations. High tensile stress concentrations around the loading points were observed and there was no difference in magnitude of stress between different types of restorations in Load-3.

The purpose of this study was to compare the stress distributions of NiTi rotary instruments based on their cross-sectional geometries of triangular shape-based cross-sectional design, S-shaped cross-sectional design and modified rectangular shape-based one using 3D FE models.

NiTi rotary files of S-shaped and modified rectangular design of cross-section such as Mtwo or NRT showed larger stress change while file rotation during simulated shaping.

The stress of files with rectangular cross-section design such as Mtwo, NRT was distributed as an intermittent pattern along the long axis of file. On the other hand, the stress of files with triangular cross-section design was distributed continuously.

When the residual stresses which could increase the risk of file fatigue fracture were analyzed after their withdrawal, the NRT and Mtwo model also presented higher residual stresses.

From this result, it can be inferred that S-shaped and modified rectangular shape-based files were more susceptible to file fracture than the files having triangular shape-based one.

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• Ex-Vivo Comparison of Torsional Stress on Nickel–Titanium Instruments Activated by Continuous Rotation or Adaptive Motion
  Joo Yeong Lee, Sang Won Kwak, Jung-Hong Ha, Hyeon-Cheol Kim
  Materials.2020; 13(8): 1900.     CrossRef
• Autogenous teeth used for bone grafting: a comparison with traditional grafting materials
  Young-Kyun Kim, Su-Gwan Kim, Pil-Young Yun, In-Sung Yeo, Seung-Chan Jin, Ji-Su Oh, Heung-Joong Kim, Sun-Kyoung Yu, Sook-Young Lee, Jae-Sung Kim, In-Woong Um, Mi-Ae Jeong, Gyung-Wook Kim
  Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology.2014; 117(1): e39.     CrossRef
• Analysis of crystalline structure of autogenous tooth bone graft material: X-Ray diffraction analysis
  Gyung-Wook Kim, In-Sung Yeo, Su-Gwan Kim, In-Woong Um, Young-Kyun Kim
  Journal of the Korean Association of Oral and Maxillofacial Surgeons.2011; 37(3): 225.     CrossRef

The purpose of this study was to investigate the influence of various occlusal loading sites and directions on the stress distribution of the cervical composite resin restorations of maxillary second premolar, using 3 dimensional (3D) finite element (FE) analysis. Extracted maxillary second premolar was scanned serially with Micro-CT (SkyScan1072; SkyScan, Aartselaar, Belgium). The 3D images were processed by 3D-DOCTOR (Able Software Co., Lexington, MA, USA). HyperMesh (Altair Engineering, Inc., Troy, USA) and ANSYS (Swanson Analysis Systems, Inc., Houston, USA) was used to mesh and analyze 3D FE model. Notch shaped cavity was filled with hybrid (Z100, 3M Dental Products, St. Paul, MN, USA) or flowable resin (Tetric Flow, Vivadent Ets., FL-9494-Schaan, Liechtenstein) and each restoration was simulated with adhesive layer thickness (40 µm). A static load of 200 N was applied on the three points of the buccal incline of the palatal cusp and oriented in 20° increments, from vertical (long axis of the tooth) to oblique 40° direction towards the buccal. The maximum principal stresses in the occlusal and cervical cavosurface margin and vertical section of buccal surfaces of notch-shaped class V cavity were analyzed using ANSYS. As the angle of loading direction increased, tensile stress increased. Loading site had little effect on it. Under same loading condition, Tetric Flow showed relatively lower stress than Z100 overall, except both point angles. Loading direction and the elastic modulus of restorative material seem to be important factor on the cervical restoration.

Citations

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• Finite element analysis of maxillary central incisors restored with various post-and-core applications
  MinSeock Seo, WonJun Shon, WooCheol Lee, Hyun-Mi Yoo, Byeong-Hoon Cho, Seung-Ho Baek
  Journal of Korean Academy of Conservative Dentistry.2009; 34(4): 324.     CrossRef

This study was to investigate the influence of combining composite resins with different elastic modulus, and occlusal loading condition on the stress distribution of restored notch-shaped non-carious cervical lesion using 3D finite element (FE) analysis.

The extracted maxillary second premolar was scanned serially with Micro-CT. The 3D images were processed by 3D-DOCTOR. ANSYS was used to mesh and analyze 3D FE model. A notch-shaped cavity was modeled and filled with hybrid, flowable resin or a combination of both. After restoration, a static load of 500N was applied in a point-load condition at buccal cusp and palatal cusp. The stress data were analyzed using analysis of principal stress.

Results showed that combining method such that apex was restored by material with high elastic modulus and the occlusal and cervical cavosurface margin by small amount of material with low elastic modulus was the most profitable method in the view of tensile stress that was considered as the dominant factor jeopardizing the restoration durability and promoting the lesion progression.

Citations

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• Effect of restoration type on the stress distribution of endodontically treated maxillary premolars; Three-dimensional finite element study
  Heun-Sook Jung, Hyeon-Cheol Kim, Bock Hur, Kwang-Hoon Kim, Kwon Son, Jeong-Kil Park
  Journal of Korean Academy of Conservative Dentistry.2009; 34(1): 8.     CrossRef
• Stress distribution of endodontically treated maxillary second premolars restored with different methods: Three-dimensional finite element analysis
  Dong-Yeol Lim, Hyeon-Cheol Kim, Bock Hur, Kwang-Hoon Kim, Kwon Son, Jeong-Kil Park
  Journal of Korean Academy of Conservative Dentistry.2009; 34(1): 69.     CrossRef
• Finite element analysis of maxillary central incisors restored with various post-and-core applications
  MinSeock Seo, WonJun Shon, WooCheol Lee, Hyun-Mi Yoo, Byeong-Hoon Cho, Seung-Ho Baek
  Journal of Korean Academy of Conservative Dentistry.2009; 34(4): 324.     CrossRef
• Stress analysis of maxillary premolars with composite resin restoration of notch-shaped class V cavity and access cavity; Three-dimensional finite element study
  Seon-Hwa Lee, Hyeon-Cheol Kim, Bock Hur, Kwang-Hoon Kim, Kwon Son, Jeong-Kil Park
  Journal of Korean Academy of Conservative Dentistry.2008; 33(6): 570.     CrossRef

This study was to investigate the influence of composite resins with different elastic modulus, cavity modification and occlusal loading condition on the stress distribution of restored notch-shaped noncarious cervical lesion using 3-dimensional (3D) finite element (FE) analysis.

The extracted maxillary second premolar was scanned serially with Micro-CT. The 3D images were processed by 3D-DOCTOR. ANSYS was used to mesh and analyze 3D FE model. A notch-shaped cavity and a modified cavity with a rounded apex were modeled. Unmodified and modified cavities were filled with hybrid or flowable resin. After restoration, a static load of 500N was applied in a point-load condition at buccal cusp and palatal cusp. The stress data were analyzed using analysis of principal stress.

The results were as follows:

In the unrestored cavity, the stresses were highly concentrated at mesial CEJ and lesion apex and the peak stress was observed at the mesial point angle under both loading conditions.

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• Effect of Loading and Restoration on the Biomechanical Behavior of Premolars with Simulated Abfraction Lesions
  Deepa N Thangaraj, Sebeena Mathew, Karthick Kumaravadivel, Kerena Joseline, Boopathi Thangavel, Manimaran Sekar
  World Journal of Dentistry.2025; 15(12): 1076.     CrossRef
• Numerical investigation of stress concentration at the tip of the V-notch partially filled with material
  V.P. Matveenko, A.Y. Fedorov, E.B. Galkina
  Computational Continuum Mechanics.2022; 15(3): 333.     CrossRef
• Clinical Evaluation of Bioactive Restorative Material versus Resin Modified Glass Ionomer in Cervical Restorations: A Randomized Controlled Clinical Trial
  Yehia Hafez Yehia, Amir Hafez Ibrahim, Eman Abou-auf, Amira Farid Elzogbhi
  Open Access Macedonian Journal of Medical Sciences.2022; 10(D): 33.     CrossRef
• Effects of Root Maturation and Thickness Variation in Coronal Mineral Trioxide Aggregate Plugs Under Traumatic Load on Stress Distribution in Regenerative Endodontic Procedures: A 3-dimensional Finite Element Analysis Study
  Akif Demirel, Tuğba Bezgin, Şaziye Sarı
  Journal of Endodontics.2021; 47(3): 492.     CrossRef
• Finite element analysis of V-shaped tooth defects filled with universal nanohybrid composite using incremental technique
  Tsanka Dikova, Tihomir Vasilev, Vesela Hristova, Vladimir Panov
  Journal of the Mechanical Behavior of Biomedical Materials.2021; 118: 104425.     CrossRef
• Are Increased Masticatory Forces Risk for Primary 2nd Molars without Successors? A 3D FEA Study
  Akif Demirel, Şaziye Sarı
  Journal of Clinical Pediatric Dentistry.2019; 43(1): 64.     CrossRef
• Finite element analysis of maxillary central incisors restored with various post-and-core applications
  MinSeock Seo, WonJun Shon, WooCheol Lee, Hyun-Mi Yoo, Byeong-Hoon Cho, Seung-Ho Baek
  Journal of Korean Academy of Conservative Dentistry.2009; 34(4): 324.     CrossRef
• The influence of combining composite resins with different elastic modulus on the stress distribution of Class V restoration: a three-dimensional finite element study
  Jeong-Kil Park, Bock Hur, Sung-Kyo Kim
  Journal of Korean Academy of Conservative Dentistry.2008; 33(3): 184.     CrossRef
• Stress analysis of maxillary premolars with composite resin restoration of notch-shaped class V cavity and access cavity; Three-dimensional finite element study
  Seon-Hwa Lee, Hyeon-Cheol Kim, Bock Hur, Kwang-Hoon Kim, Kwon Son, Jeong-Kil Park
  Journal of Korean Academy of Conservative Dentistry.2008; 33(6): 570.     CrossRef

The purpose of this study was to investigate the effects of composite resin restorations on the stress distribution of notch shaped noncarious cervical lesion using three-dimensional (3D) finite element analysis (FEA).

Extracted maxillary second premolar was scanned serially with Micro-CT (SkyScan1072; SkyScan, Aartselaar, Belgium). The 3D images were processed by 3D-DOCTOR (Able Software Co., Lexington, MA, USA). ANSYS (Swanson Analysis Systems, Inc., Houston, USA) was used to mesh and analyze 3D FE model. Notch shaped cavity was filled with hybrid or flowable resin and each restoration was simulated with adhesive layer thickness (40 µM). A static load of 500 N was applied on a point load condition at buccal cusp (loading A) and palatal cusp (loading B). The principal stresses in the lesion apex (internal line angle of cavity) and middle vertical wall were analyzed using ANSYS.

The results were as follows

1. Under loading A, compressive stress is created in the unrestored and restored cavity. Under loading B, tensile stress is created. And the peak stress concentration is seen at near mesial corner of the cavity under each load condition.

2. Compared to the unrestored cavity, the principal stresses at the cemeto-enamel junction (CEJ) and internal line angle of the cavity were more reduced in the restored cavity on both load conditions.

3. In teeth restored with hybrid composite, the principal stresses at the CEJ and internal line angle of the cavity were more reduced than flowable resin.

Citations

Citations to this article as recorded by  

• The influence of occlusal loads on stress distribution of cervical composite resin restorations: A three-dimensional finite element study
  Chan-Seok Park, Bock Hur, Hyeon-Cheol Kim, Kwang-Hoon Kim, Kwon Son, Jeong-Kil Park
  Journal of Korean Academy of Conservative Dentistry.2008; 33(3): 246.     CrossRef

The objective of this study was to investigate the effects of various occlusal loads on the stress distribution of the buccal cervical region of a normal maxillary second premolar, using a three dimensional finite element analysis (3D FEA).

After 3D FE modeling of maxillary second premolar, a static load of 500N of three load cases was applied. Stress analysis was performed using ANSYS (Swanson Analysis Systems, Inc., Houston, USA). The maximum principal stresses and minimum principal stresses were sampled at thirteen nodal points in the buccal cervical enamel for each four horizontal planes, 1.0 mm above CEJ, 0.5 mm above CEJ, CEJ, 0.5 mm under CEJ.

The results were as follows

1. The peak stress was seen at the cervical enamel surface of the mesiobuccal line angle area, asymmetrically.

2. The values of compressive stresses were within the range of the failure stress of enamel. But the values of tensile stresses exceeded the range of the failure stress of enamel.

3. The tensile stresses from the perpendicular load at the buccal incline of palatal cusp may be shown to be the primary etiological factors of the NCCLs.

Citations

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• Effect of restoration type on the stress distribution of endodontically treated maxillary premolars; Three-dimensional finite element study
  Heun-Sook Jung, Hyeon-Cheol Kim, Bock Hur, Kwang-Hoon Kim, Kwon Son, Jeong-Kil Park
  Journal of Korean Academy of Conservative Dentistry.2009; 34(1): 8.     CrossRef
• Stress distribution of endodontically treated maxillary second premolars restored with different methods: Three-dimensional finite element analysis
  Dong-Yeol Lim, Hyeon-Cheol Kim, Bock Hur, Kwang-Hoon Kim, Kwon Son, Jeong-Kil Park
  Journal of Korean Academy of Conservative Dentistry.2009; 34(1): 69.     CrossRef

The purpose of this study was to analyze the stress distribution aspect of unrestored and restored combined shape (wedge shape occlusally and saucer shape gingivally) class V cavity, which found frequently in clinical cases.

A maxillary second premolar restored with a combined shape class V composite restorations were modeled using the three dimensional finite element method. Static occlusal load of 170 N was applied on lingual incline of buccal cusp at the angle of 45° with the longitudinal axis of the tooth. And three dimensional finite element analysis was taken by ANSYS (Version 6.0, Swanson Analysis System Co., Houston, U.S.A) program which represent the stress distribution on unrestored and restored cavity wall and margin.

The conclusions were as follows.

Compared to the unrestored cavity, Von Mises stress at the cementoenamel junction and line angle of the cavity base were reduced and in restored cavity.

Citations

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• Comparison of marginal microleakage between low and high flowable resins in class V cavity
  Sang-Bae Bae, Young-Gon Cho, Myeong-Seon Lee
  Journal of Korean Academy of Conservative Dentistry.2009; 34(6): 477.     CrossRef

The objective of this study was to investigate the effect of excessive occlusal loading on stress distribution on four type of cervical lesion, using a three dimensional finite element analysis (3D FEA).

The extracted maxillary second premolar was scanned serially with Micro-CT. The 3D images were processed by 3D-DOCTOR. ANSYS was used to mesh and analyze 3D FE model. Four different lesion configurations representative of the various types observed clinically for teeth were studied. A static point load of 500N was applied to the buccal and lingual cusp (Load A and B). The principal stresses in lesion apex, and vertical sectioned margin of cervical wall were analyzed.

The results were as follows

The patterns of stress distribution were similar but the magnitude was different in four types of lesion.