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Sema Belli - One of the best experts on this subject based on the ideXlab platform.

  • Effect of Loading Direction, Crown Coverage, and Adjacent Teeth on Stresses in Post-Restored Premolars
    Strength of Materials, 2020
    Co-Authors: O. Küçük, Oğuz Eraslan, G. Eskitascioglu, Sema Belli
    Abstract:

    The aims of this finite elemental stress analysis (FEA) study were to evaluate the effects of loading direction, crown coverage, and adjacent teeth on stress distribution in Premolar Tooth models restored using fiber-post restoration. Three 3D Premolar Tooth FEA models were created as follows: Model 1: sound Tooth; Model 2: Tooth-model including root filling, fiber-post and composite resin restoration; Model 3: Tooth-model including root filling, fiber-post, composite resin core and ceramic crown. Three more models were created using Models 1, 2, and 3 with adjacent teeth (Models 4, 5, and 6). The Cosmoworks structural-analysis program was used for the stress analysis, which was based on the von Mises criterion. High stress concentrations were observed at the mesial side of the sound Tooth models while the stresses were localized at both sides in the others. Loading with a nonzero inclination angle caused higher stress concentrations within the Tooth structure than is other models with the normal/vertical loading. The presence of adjacent teeth strongly influenced stress distributions and concentrations in Models 4, 5, and 6, reducing the stress level. Meanwhile, crown restoration did not change the stress patterns.

  • The effect of cavity shape and hybrid layer on the stress distribution of cervical composite restorations.
    European journal of dentistry, 2011
    Co-Authors: Evrim Eliguzeloglu, Oğuz Eraslan, Gurcan Eskitascioglu, Hüma Ömürlü, Sema Belli
    Abstract:

    Objectives: The aim of this finite elemental stress analysis study was to evaluate the effect of cavity shape and hybrid layer on the stress distribution of the mandibular Premolar Tooth under occlusal loading.

  • Conservative restoration of severely damaged endodontically treated Premolar teeth: a FEM study
    Clinical oral investigations, 2010
    Co-Authors: Öznur Eraslan, Oğuz Eraslan, Gurcan Eskitascioglu, Sema Belli
    Abstract:

    The aim of this finite element method (FEM) study was to test two different restorative techniques used for construction of severely damaged endodontically treated Premolar teeth using Finite Element Stress Analysis Method. In this study, four types of three-dimensional (3-D) FEM mathematical models simulating (1) a sound lower single rooted Premolar Tooth with supporting structures; (2) a root-filled lower Premolar Tooth without lingual cusp, restored with resin composite; (3) a root-filled lower Premolar Tooth without lingual cusp restored with resin composite in combination with a polyethylene fiber which is placed circumferentially to help to create a composite lingual wall; (4) a root-filled lower Premolar Tooth without lingual cusp restored with resin composite in combination with a glass fiber post, were modeled. A 300-N static vertical occlusal load was applied on the node at the center of occlusal surface of the Tooth to calculate stress distributions. Solidworks/Cosmosworks structural analysis programs were used for FEM analysis. The analysis of the von Mises stress values revealed that maximum stress concentrations were located at loading areas for all models. Root dentine tissue, lingual cortical bone, and apical bone structures were other stress concentration regions. There were stress concentration differences among the models at root dentine tissue. Although the distribution pattern was similar with composite resin restored Tooth model, highest stress values were observed at root dentine in the model restored with post-and-core. Post structure accumulated more stress on its own body. Stress distribution patterns of sound Tooth and fiber-reinforced restoration models were found as similar. The present study showed that the use of post material increased the stress values at root dentine structure while reinforcing the restoration with a fiber decreases stress transmission. Fiber-reinforced restoration provided stress distributions similar to sound Tooth.

  • Effect of hybrid layer and thickness on stress distribution of cervical wedge-shaped restorations.
    European journal of dentistry, 2010
    Co-Authors: Evrim Eliguzeloglu, Oğuz Eraslan, Gurcan Eskitascioglu, Hüma Ömürlü, Sema Belli
    Abstract:

    OBJECTIVES The aim of this finite elemental stress analysis study was to evaluate the effect of a hybrid layer and the hybrid layer thickness on the shear stress distribution in mandibular Premolar teeth under occlusal loading. METHODS The mandibular Premolar Tooth was selected based on the anatomical measurements suggested by Wheeler. The analysis was performed with a computer with the SAP 2000 structural analysis program. Three different mathematical models were evaluated; 1) composite restoration without a hybrid layer 2) composite restoration with a 1.5 mum thick hybrid layer and 3) composite restoration with a 3 mum thick hybrid layer. A total of 200 N of occlusal loading force was simulated from the buccal tubercule and central fossa of the Premolar Tooth. The findings were drawn by the Saplot program. RESULTS In model B, the output showed that hybrid layer reduced the shear stress concentration especially on gingival margin of the composite. Similarly shear stress intensity was decreased by a thick hybrid layer in model C, especially on the gingival margin of the composite. CONCLUSIONS The hybrid layer and its thickness plays an important role on stress distribution and intensity in cervical restorations.

  • Effect of hybrid layer on stress distribution in a Premolar Tooth restored with composite or ceramic inlay: an FEM study.
    Journal of biomedical materials research. Part B Applied biomaterials, 2005
    Co-Authors: Sema Belli, Gurcan Eskitascioglu, Oğuz Eraslan, Pisol Senawongse, Junji Tagami
    Abstract:

    The aim of this finite elemental stress analysis study was to evaluate the effect of hybrid layer on distribution and amount of stress formed under occlusal loading in a Premolar Tooth restored with composite or ceramic inlay. The mandibular Premolar Tooth was selected as the model based on the anatomical measurements suggested by Wheeler. The analysis is performed by using a Pentium II IBM compatible computer with the SAP 2000 structural analysis program. Four different mathematical models including the following structures were evaluated: 1) composite inlay, adhesive resin, and Tooth structure; 2) composite inlay, adhesive resin, hybrid layer, and Tooth structure; 3) ceramic inlay, adhesive resin, and Tooth structure; 4) ceramic inlay, adhesive resin, hybrid layer, and Tooth structure. Loading was applied from the occlusal surface of the restoration, and shear stresses under loading were evaluated. The findings were drawn by the Saplot program, and the results were analyzed by graphical comparison method. The output indicated that the hybrid layer acts as a stress absorber in models 2 and 4. The hybrid layer has also changed mathematical values of stress on cavity floors in both restoration types. Ceramic inlay collected the stress inside the body of the material, but the composite inlay directly transferred the stress through dental tissues. As a result, it was concluded that the hybrid layer has an effect on stress distribution under loading in a Premolar Tooth model restored with composite or ceramic inlay.

Oğuz Eraslan - One of the best experts on this subject based on the ideXlab platform.

  • Effect of Loading Direction, Crown Coverage, and Adjacent Teeth on Stresses in Post-Restored Premolars
    Strength of Materials, 2020
    Co-Authors: O. Küçük, Oğuz Eraslan, G. Eskitascioglu, Sema Belli
    Abstract:

    The aims of this finite elemental stress analysis (FEA) study were to evaluate the effects of loading direction, crown coverage, and adjacent teeth on stress distribution in Premolar Tooth models restored using fiber-post restoration. Three 3D Premolar Tooth FEA models were created as follows: Model 1: sound Tooth; Model 2: Tooth-model including root filling, fiber-post and composite resin restoration; Model 3: Tooth-model including root filling, fiber-post, composite resin core and ceramic crown. Three more models were created using Models 1, 2, and 3 with adjacent teeth (Models 4, 5, and 6). The Cosmoworks structural-analysis program was used for the stress analysis, which was based on the von Mises criterion. High stress concentrations were observed at the mesial side of the sound Tooth models while the stresses were localized at both sides in the others. Loading with a nonzero inclination angle caused higher stress concentrations within the Tooth structure than is other models with the normal/vertical loading. The presence of adjacent teeth strongly influenced stress distributions and concentrations in Models 4, 5, and 6, reducing the stress level. Meanwhile, crown restoration did not change the stress patterns.

  • The effect of cavity shape and hybrid layer on the stress distribution of cervical composite restorations.
    European journal of dentistry, 2011
    Co-Authors: Evrim Eliguzeloglu, Oğuz Eraslan, Gurcan Eskitascioglu, Hüma Ömürlü, Sema Belli
    Abstract:

    Objectives: The aim of this finite elemental stress analysis study was to evaluate the effect of cavity shape and hybrid layer on the stress distribution of the mandibular Premolar Tooth under occlusal loading.

  • Conservative restoration of severely damaged endodontically treated Premolar teeth: a FEM study
    Clinical oral investigations, 2010
    Co-Authors: Öznur Eraslan, Oğuz Eraslan, Gurcan Eskitascioglu, Sema Belli
    Abstract:

    The aim of this finite element method (FEM) study was to test two different restorative techniques used for construction of severely damaged endodontically treated Premolar teeth using Finite Element Stress Analysis Method. In this study, four types of three-dimensional (3-D) FEM mathematical models simulating (1) a sound lower single rooted Premolar Tooth with supporting structures; (2) a root-filled lower Premolar Tooth without lingual cusp, restored with resin composite; (3) a root-filled lower Premolar Tooth without lingual cusp restored with resin composite in combination with a polyethylene fiber which is placed circumferentially to help to create a composite lingual wall; (4) a root-filled lower Premolar Tooth without lingual cusp restored with resin composite in combination with a glass fiber post, were modeled. A 300-N static vertical occlusal load was applied on the node at the center of occlusal surface of the Tooth to calculate stress distributions. Solidworks/Cosmosworks structural analysis programs were used for FEM analysis. The analysis of the von Mises stress values revealed that maximum stress concentrations were located at loading areas for all models. Root dentine tissue, lingual cortical bone, and apical bone structures were other stress concentration regions. There were stress concentration differences among the models at root dentine tissue. Although the distribution pattern was similar with composite resin restored Tooth model, highest stress values were observed at root dentine in the model restored with post-and-core. Post structure accumulated more stress on its own body. Stress distribution patterns of sound Tooth and fiber-reinforced restoration models were found as similar. The present study showed that the use of post material increased the stress values at root dentine structure while reinforcing the restoration with a fiber decreases stress transmission. Fiber-reinforced restoration provided stress distributions similar to sound Tooth.

  • Effect of hybrid layer and thickness on stress distribution of cervical wedge-shaped restorations.
    European journal of dentistry, 2010
    Co-Authors: Evrim Eliguzeloglu, Oğuz Eraslan, Gurcan Eskitascioglu, Hüma Ömürlü, Sema Belli
    Abstract:

    OBJECTIVES The aim of this finite elemental stress analysis study was to evaluate the effect of a hybrid layer and the hybrid layer thickness on the shear stress distribution in mandibular Premolar teeth under occlusal loading. METHODS The mandibular Premolar Tooth was selected based on the anatomical measurements suggested by Wheeler. The analysis was performed with a computer with the SAP 2000 structural analysis program. Three different mathematical models were evaluated; 1) composite restoration without a hybrid layer 2) composite restoration with a 1.5 mum thick hybrid layer and 3) composite restoration with a 3 mum thick hybrid layer. A total of 200 N of occlusal loading force was simulated from the buccal tubercule and central fossa of the Premolar Tooth. The findings were drawn by the Saplot program. RESULTS In model B, the output showed that hybrid layer reduced the shear stress concentration especially on gingival margin of the composite. Similarly shear stress intensity was decreased by a thick hybrid layer in model C, especially on the gingival margin of the composite. CONCLUSIONS The hybrid layer and its thickness plays an important role on stress distribution and intensity in cervical restorations.

  • Effect of hybrid layer on stress distribution in a Premolar Tooth restored with composite or ceramic inlay: an FEM study.
    Journal of biomedical materials research. Part B Applied biomaterials, 2005
    Co-Authors: Sema Belli, Gurcan Eskitascioglu, Oğuz Eraslan, Pisol Senawongse, Junji Tagami
    Abstract:

    The aim of this finite elemental stress analysis study was to evaluate the effect of hybrid layer on distribution and amount of stress formed under occlusal loading in a Premolar Tooth restored with composite or ceramic inlay. The mandibular Premolar Tooth was selected as the model based on the anatomical measurements suggested by Wheeler. The analysis is performed by using a Pentium II IBM compatible computer with the SAP 2000 structural analysis program. Four different mathematical models including the following structures were evaluated: 1) composite inlay, adhesive resin, and Tooth structure; 2) composite inlay, adhesive resin, hybrid layer, and Tooth structure; 3) ceramic inlay, adhesive resin, and Tooth structure; 4) ceramic inlay, adhesive resin, hybrid layer, and Tooth structure. Loading was applied from the occlusal surface of the restoration, and shear stresses under loading were evaluated. The findings were drawn by the Saplot program, and the results were analyzed by graphical comparison method. The output indicated that the hybrid layer acts as a stress absorber in models 2 and 4. The hybrid layer has also changed mathematical values of stress on cavity floors in both restoration types. Ceramic inlay collected the stress inside the body of the material, but the composite inlay directly transferred the stress through dental tissues. As a result, it was concluded that the hybrid layer has an effect on stress distribution under loading in a Premolar Tooth model restored with composite or ceramic inlay.

Gurcan Eskitascioglu - One of the best experts on this subject based on the ideXlab platform.

  • The effect of cavity shape and hybrid layer on the stress distribution of cervical composite restorations.
    European journal of dentistry, 2011
    Co-Authors: Evrim Eliguzeloglu, Oğuz Eraslan, Gurcan Eskitascioglu, Hüma Ömürlü, Sema Belli
    Abstract:

    Objectives: The aim of this finite elemental stress analysis study was to evaluate the effect of cavity shape and hybrid layer on the stress distribution of the mandibular Premolar Tooth under occlusal loading.

  • Conservative restoration of severely damaged endodontically treated Premolar teeth: a FEM study
    Clinical oral investigations, 2010
    Co-Authors: Öznur Eraslan, Oğuz Eraslan, Gurcan Eskitascioglu, Sema Belli
    Abstract:

    The aim of this finite element method (FEM) study was to test two different restorative techniques used for construction of severely damaged endodontically treated Premolar teeth using Finite Element Stress Analysis Method. In this study, four types of three-dimensional (3-D) FEM mathematical models simulating (1) a sound lower single rooted Premolar Tooth with supporting structures; (2) a root-filled lower Premolar Tooth without lingual cusp, restored with resin composite; (3) a root-filled lower Premolar Tooth without lingual cusp restored with resin composite in combination with a polyethylene fiber which is placed circumferentially to help to create a composite lingual wall; (4) a root-filled lower Premolar Tooth without lingual cusp restored with resin composite in combination with a glass fiber post, were modeled. A 300-N static vertical occlusal load was applied on the node at the center of occlusal surface of the Tooth to calculate stress distributions. Solidworks/Cosmosworks structural analysis programs were used for FEM analysis. The analysis of the von Mises stress values revealed that maximum stress concentrations were located at loading areas for all models. Root dentine tissue, lingual cortical bone, and apical bone structures were other stress concentration regions. There were stress concentration differences among the models at root dentine tissue. Although the distribution pattern was similar with composite resin restored Tooth model, highest stress values were observed at root dentine in the model restored with post-and-core. Post structure accumulated more stress on its own body. Stress distribution patterns of sound Tooth and fiber-reinforced restoration models were found as similar. The present study showed that the use of post material increased the stress values at root dentine structure while reinforcing the restoration with a fiber decreases stress transmission. Fiber-reinforced restoration provided stress distributions similar to sound Tooth.

  • Effect of hybrid layer and thickness on stress distribution of cervical wedge-shaped restorations.
    European journal of dentistry, 2010
    Co-Authors: Evrim Eliguzeloglu, Oğuz Eraslan, Gurcan Eskitascioglu, Hüma Ömürlü, Sema Belli
    Abstract:

    OBJECTIVES The aim of this finite elemental stress analysis study was to evaluate the effect of a hybrid layer and the hybrid layer thickness on the shear stress distribution in mandibular Premolar teeth under occlusal loading. METHODS The mandibular Premolar Tooth was selected based on the anatomical measurements suggested by Wheeler. The analysis was performed with a computer with the SAP 2000 structural analysis program. Three different mathematical models were evaluated; 1) composite restoration without a hybrid layer 2) composite restoration with a 1.5 mum thick hybrid layer and 3) composite restoration with a 3 mum thick hybrid layer. A total of 200 N of occlusal loading force was simulated from the buccal tubercule and central fossa of the Premolar Tooth. The findings were drawn by the Saplot program. RESULTS In model B, the output showed that hybrid layer reduced the shear stress concentration especially on gingival margin of the composite. Similarly shear stress intensity was decreased by a thick hybrid layer in model C, especially on the gingival margin of the composite. CONCLUSIONS The hybrid layer and its thickness plays an important role on stress distribution and intensity in cervical restorations.

  • Effect of hybrid layer on stress distribution in a Premolar Tooth restored with composite or ceramic inlay: an FEM study.
    Journal of biomedical materials research. Part B Applied biomaterials, 2005
    Co-Authors: Sema Belli, Gurcan Eskitascioglu, Oğuz Eraslan, Pisol Senawongse, Junji Tagami
    Abstract:

    The aim of this finite elemental stress analysis study was to evaluate the effect of hybrid layer on distribution and amount of stress formed under occlusal loading in a Premolar Tooth restored with composite or ceramic inlay. The mandibular Premolar Tooth was selected as the model based on the anatomical measurements suggested by Wheeler. The analysis is performed by using a Pentium II IBM compatible computer with the SAP 2000 structural analysis program. Four different mathematical models including the following structures were evaluated: 1) composite inlay, adhesive resin, and Tooth structure; 2) composite inlay, adhesive resin, hybrid layer, and Tooth structure; 3) ceramic inlay, adhesive resin, and Tooth structure; 4) ceramic inlay, adhesive resin, hybrid layer, and Tooth structure. Loading was applied from the occlusal surface of the restoration, and shear stresses under loading were evaluated. The findings were drawn by the Saplot program, and the results were analyzed by graphical comparison method. The output indicated that the hybrid layer acts as a stress absorber in models 2 and 4. The hybrid layer has also changed mathematical values of stress on cavity floors in both restoration types. Ceramic inlay collected the stress inside the body of the material, but the composite inlay directly transferred the stress through dental tissues. As a result, it was concluded that the hybrid layer has an effect on stress distribution under loading in a Premolar Tooth model restored with composite or ceramic inlay.

  • Effects of cantilever design and material on stress distribution in fixed partial dentures – a finite element analysis
    Journal of oral rehabilitation, 2005
    Co-Authors: Oğuz Eraslan, Müjde Sevimay, Aslihan Usumez, Gurcan Eskitascioglu
    Abstract:

    summary  The purpose of this study was to examine the stress distribution in distal cantilevered fixed partial dentures (FPDs) that are designed with different cantilever morphology and made from different restorative materials. The finite element (FE) method was used to create models of two restoration types; metal-ceramic and an all-ceramic FPDs. Both models were designed with distal cantilevers involving the first and second Premolars as abutments and cantilever extension involving at the Premolar or molar. The width of connector between the cantilever and the primary abutment restoration was 2·25 mm. The load applied during the FE analysis was positioned at the cusp tips of all teeth. The FE analysis of the models revealed that Von Mises stress values with maximum stress concentrations were observed on connectors of distal cantilevers. Stress concentration sites were also observed at the distal cervical area of the second Premolar Tooth. Models with Premolar cantilever extensions restored with all-ceramic induced lower Von Mises stress values than metal-ceramic restorations, however models with molar cantilever extensions restored with all-ceramic restorations induced higher Von Misses stress values than metal-ceramic restorations. If the distal cantilever length and restorative material is appropriately chosen, the failure frequency may be reduced. All ceramic can be used as restorative material, when the cantilevers length is not more than the mesiodistal dimension of a Premolar Tooth and metal-ceramic restorations can be used in longer situations.

Evrim Eliguzeloglu - One of the best experts on this subject based on the ideXlab platform.

  • The effect of cavity shape and hybrid layer on the stress distribution of cervical composite restorations.
    European journal of dentistry, 2011
    Co-Authors: Evrim Eliguzeloglu, Oğuz Eraslan, Gurcan Eskitascioglu, Hüma Ömürlü, Sema Belli
    Abstract:

    Objectives: The aim of this finite elemental stress analysis study was to evaluate the effect of cavity shape and hybrid layer on the stress distribution of the mandibular Premolar Tooth under occlusal loading.

  • Effect of hybrid layer and thickness on stress distribution of cervical wedge-shaped restorations.
    European journal of dentistry, 2010
    Co-Authors: Evrim Eliguzeloglu, Oğuz Eraslan, Gurcan Eskitascioglu, Hüma Ömürlü, Sema Belli
    Abstract:

    OBJECTIVES The aim of this finite elemental stress analysis study was to evaluate the effect of a hybrid layer and the hybrid layer thickness on the shear stress distribution in mandibular Premolar teeth under occlusal loading. METHODS The mandibular Premolar Tooth was selected based on the anatomical measurements suggested by Wheeler. The analysis was performed with a computer with the SAP 2000 structural analysis program. Three different mathematical models were evaluated; 1) composite restoration without a hybrid layer 2) composite restoration with a 1.5 mum thick hybrid layer and 3) composite restoration with a 3 mum thick hybrid layer. A total of 200 N of occlusal loading force was simulated from the buccal tubercule and central fossa of the Premolar Tooth. The findings were drawn by the Saplot program. RESULTS In model B, the output showed that hybrid layer reduced the shear stress concentration especially on gingival margin of the composite. Similarly shear stress intensity was decreased by a thick hybrid layer in model C, especially on the gingival margin of the composite. CONCLUSIONS The hybrid layer and its thickness plays an important role on stress distribution and intensity in cervical restorations.

Cecilia C.s. Dong - One of the best experts on this subject based on the ideXlab platform.

  • the root and root canal morphology of the human mandibular second Premolar a literature review
    Journal of Endodontics, 2007
    Co-Authors: Laine Clegho, William H Christie, Cecilia C.s. Dong
    Abstract:

    The objective was to review thoroughly the literature of the root and root canal morphology of the human mandibular second Premolar and compare the results with the mandibular first Premolar. Published studies cite the anatomy and morphology of the mandibular second Premolar Tooth for more than 7700 teeth. These studies were divided into anatomic studies reporting the number of roots, number of canals, and apical anatomy. Differences caused by gender and ethnicity have also been reported. Individual case reports of anomalies were included to demonstrate the extreme range of variation. Almost all of the teeth in the anatomic studies were single-rooted (99.6%). The incidence of 2 roots (0.3%) and 3 roots (0.1%) was extremely rare. Anatomic studies of the internal canal morphology found that a single canal was present in 91.0% of the teeth. A single apical foramen was found in 91.8% of the teeth. The incidence of more than 1 root (0.4%), more than 1 canal system (9.9%), and more than 1 foramen (8.2%) is lower than that of the mandibular first Premolar Tooth (2.0%, 24.2%, and 21.1%, respectively). However, the root and root canal morphology of the mandibular second Premolar can be extremely complex and requires careful assessment.