Effect of three different veneering techniques on the stress distribution and in vitro fatigue behavior of core-veneer all-ceramic fixed partial dentures

Background. The present study aimed to evaluate the influence of the veneering technique on the tensile stress distribution and survival of full-ceramic fixed dental prostheses (FDPs). Methods. A three-dimensional model of an FDP was modeled on a second premolar and a second molar with a pontic between them for finite element analysis (FEA). The groups were divided according to the veneering technique: conventional stratification, rapid layer, and CAD-on techniques. A mesh control test determined the number of elements and nodes. The materials’ properties were attributed to each solid component with isotropic, homogeneous, and linear elastic behavior. For the in vitro fatigue test (n=30), the FDPs were cemented on dentin analog abutments and submitted to 2×106 mechanical cycles (100 N at 3 Hz). Results. Maximum principal stress showed that the connector between the pontic and the second molar concentrated higher stresses, regardless of the techniques: Rapid layer (6 MPa)> CAD-on (5.5 MPa)> conventional stratification (4 MPa). The conventional stratification technique concentrated high stresses at the interface between the framework and veneering ceramic (2 MPa), followed by the rapid layer (1.8 MPa) and CAD-on (1.5 MPa) techniques. The crowns fabricated using the rapid layer and CAD-on techniques exhibited a 100% survival rate, while the conventional stratification group had 0% survival. Conclusion. Even with similar stress distribution between the veneering techniques, the conventional stratification technique was more prone to failure under fatigue due to higher defects incorporated than CAD-on and rapid layer techniques.

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Comparative Stress Distribution of Implant-Retained Mandibular Ball-Supported and Bar-Supported Overlay Dentures: A Finite Element Analysis

Journal of Oral Implantology ◽

10.1563/aaid-joi-d-10-00057 ◽

2011 ◽

Vol 37 (4) ◽

pp. 421-429 ◽

Cited By ~ 15

Author(s):

Fariborz Vafaei ◽

Masoumeh Khoshhal ◽

Saeed Bayat-Movahed ◽

Ahmad Hassan Ahangary ◽

Farnaz Firooz ◽

...

Keyword(s):

Stress Distribution ◽

Strain Distribution ◽

Treatment Options ◽

Three Dimensional ◽

Distribution Patterns ◽

Three Dimensional Model ◽

Element Analysis ◽

Second Molar ◽

Edentulous Mandible ◽

Tomography Scan

Abstract Implant-retained mandibular ball-supported and bar-supported overlay dentures are the two most common treatment options for the edentulous mandible. The superior option in terms of strain distribution should be determined. The three-dimensional model of mandible (based on computerized tomography scan) and its overlying implant-retained bar-supported and ball-supported overlay dentures were simulated using SolidWorks, NURBS, and ANSYS Workbench. Loads A (60 N) and B (60 N) were exerted, respectively, in protrusive and laterotrusive motions, on second molar mesial, first molar mesial, and first premolar. The strain distribution patterns were assessed on (1) implant tissue, (2) first implant-bone, and (3) second implant-bone interfaces. Protrusive: Strain was mostly detected in the apical of the fixtures and least in the cervical when bar design was used. On the nonworking side, however, strain was higher in the cervical and lower in the apical compared with the working side implant. Laterotrusive: The strain values were closely similar in the two designs. It seems that both designs are acceptable in terms of stress distribution, although a superior pattern is associated with the application of bar design in protrusive motion.

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Biomechanical assessment of different fixation methods in mandibular high sagittal oblique osteotomy using a three-dimensional finite element analysis model

Scientific Reports ◽

10.1038/s41598-021-88332-2 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Charles Savoldelli ◽

Elodie Ehrmann ◽

Yannick Tillier

Keyword(s):

Finite Element ◽

Stress Distribution ◽

Three Dimensional ◽

Von Mises Stress ◽

Analysis Model ◽

Element Analysis ◽

Fixation Methods ◽

Oblique Osteotomy ◽

Von Mises

AbstractWith modern-day technical advances, high sagittal oblique osteotomy (HSOO) of the mandible was recently described as an alternative to bilateral sagittal split osteotomy for the correction of mandibular skeletal deformities. However, neither in vitro nor numerical biomechanical assessments have evaluated the performance of fixation methods in HSOO. The aim of this study was to compare the biomechanical characteristics and stress distribution in bone and osteosynthesis fixations when using different designs and placing configurations, in order to determine a favourable plating method. We established two finite element models of HSOO with advancement (T1) and set-back (T2) movements of the mandible. Six different configurations of fixation of the ramus, progressively loaded by a constant force, were assessed for each model. The von Mises stress distribution in fixations and in bone, and bony segment displacement, were analysed. The lowest mechanical stresses and minimal gradient of displacement between the proximal and distal bony segments were detected in the combined one-third anterior- and posterior-positioned double mini-plate T1 and T2 models. This suggests that the appropriate method to correct mandibular deformities in HSOO surgery is with use of double mini-plates positioned in the anterior one-third and posterior one-third between the bony segments of the ramus.

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Influence of the TMJ Implant Geometry on Stress Distribution

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.488-489.991 ◽

2012 ◽

Vol 488-489 ◽

pp. 991-995 ◽

Cited By ~ 1

Author(s):

Zohreh Arabshahi ◽

Jamal Kashani ◽

Mohammed Rafiq Abdul Kadir ◽

Abbas Azari

Keyword(s):

Stress Distribution ◽

Temporomandibular Joint ◽

Contact Surface ◽

Equivalent Stress ◽

Three Dimensional ◽

Surface Region ◽

Implant Design ◽

Three Dimensional Model ◽

Element Analysis ◽

Applied Loading

The purpose of this study was to investigate the influence of Temporomandibular Joint implant geometry on stress distribution in total reconstruction of temporomandibular joint. A three dimensional model of a lower jaw of a patient was developed from a Computed Tomography scan images. Anatomical curvature and flat contact surface of implant design and fixation screws were modeled. Two implanted mandibles were then compared by means of finite element analysis. The muscle forces for incisal clenching were applied. The equivalent stress resulted in contact surface region of the bone and implant and in fixation screw holes were investigated to evaluate the designs. In applied loading condition, The results showed that anatomical design of implant was more preferred and it will lead to long-term success of implant.

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Comparative analysis of stress distribution in one-piece and two-piece implants with narrow and extra-narrow diameters: A finite element study

PLoS ONE ◽

10.1371/journal.pone.0245800 ◽

2021 ◽

Vol 16 (2) ◽

pp. e0245800

Author(s):

Fabricia Teixeira Barbosa ◽

Luiz Carlos Silveira Zanatta ◽

Edélcio de Souza Rendohl ◽

Sergio Alexandre Gehrke

Keyword(s):

Finite Element ◽

Stress Distribution ◽

Three Dimensional ◽

In Vitro Study ◽

Von Mises Stress ◽

Axial Loads ◽

Three Dimensional Model ◽

The One ◽

Von Mises

Objectives The aim of this in vitro study was to evaluate the stress distribution on three implant models with narrow and extra-narrow diameters using the finite element method (FEA). Materials and methods Dental implants of extra-narrow diameter of 2.5 mm for a one-piece implant (group G1), a narrow diameter of 3.0 mm for a one-piece implant (group G2) and a narrow diameter of 3.5 mm for a two-piece implant with a Morse taper connection (group G3). A three-dimensional model was designed with cortical and cancellous bone, a crown and an implant/abutment set of each group. Axial and angled (30°) loads of 150 N was applied. The equivalent von Mises stress was used for the implants and peri-implant bone plus the Mohr-Coulomb analysis to confirm the data of the peri-implant bone. Results In the axial load, the maximum stress value of the cortical bone for the group G1 was 22.35% higher than that the group G2 and 321.23% than the group G3. Whereas in angled load, the groups G1 and G2 showing a similar value (# 3.5%) and a highest difference for the group G3 (391.8%). In the implant structure, the group G1 showed a value of 2188MPa, 93.6% higher than the limit. Conclusions The results of this study show that the extra-narrow one-piece implant should be used with great caution, especially in areas of non-axial loads, whereas the one- and two-piece narrow-diameter implants show adequate behavior in both directions of the applied load.

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Three-Dimensional Finite Element Analysis to Evaluate Stress Distribution in Tooth and Implant-Supported Fixed Partial Denture–An In Vitro Study

Dental Journal of Advance Studies ◽

10.1055/s-0040-1714331 ◽

2020 ◽

Vol 8 (03) ◽

pp. 084-091

Author(s):

Himani Jain ◽

Tarun Kalra ◽

Manjit Kumar ◽

Ajay Bansal ◽

Deepti Jain

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Stress Distribution ◽

Alveolar Bone ◽

Three Dimensional ◽

In Vitro Study ◽

Stress Concentrations ◽

Element Analysis ◽

Three Dimensional Finite Element

Abstract Introduction This study was undertaken to assess the influence of different superstructure materials, when subjected to occlusal loading, on the pattern of stress distribution in tooth-supported, implant-supported, and tooth implant-supported fixed partial prostheses, using the finite element analysis with a comparative viewpoint. Materials and Methods The geometric models of implant and mandibular bone were generated. Three models were created in accordance with the need of the study. The first model was given a tooth-supported fixed partial prosthesis. The second model was given tooth implant-supported fixed partial prosthesis, and the third model was given implant-supported fixed partial prosthesis. Forces of 100 N and 50 N were applied axially and buccolingually, respectively. Results The present study compared the stresses arising in the natural tooth, implant, and the whole prostheses under simulated axial and buccolingual loading of three types of fixed partial dentures, namely, tooth-supported, tooth implant-supported, and implant-supported fixed partial dental prostheses using three different types of materials. Conclusion The pattern of stress distribution did not appear to be significantly affected by the type of prosthesis materials in all models. The maximum stress concentrations were found in the alveolar bone around the neck of the teeth and implants.

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A Finite Element Analysis to Compare Stress Distribution on Extra-Short Implants with Two Different Internal Connections

Journal of Clinical Medicine ◽

10.3390/jcm8081103 ◽

2019 ◽

Vol 8 (8) ◽

pp. 1103 ◽

Cited By ~ 3

Author(s):

García-Braz ◽

Prados-Privado ◽

Zanatta ◽

Calvo-Guirado ◽

Prados-Frutos ◽

...

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Stress Distribution ◽

Axial Load ◽

Three Dimensional ◽

Dimensional Model ◽

Stress Concentrations ◽

Three Dimensional Model ◽

Element Analysis ◽

Short Implants

Background: The goal of this study was to analyze the stress distribution on two types of extra-short dental implants with 5 mm of length: An internal hexagon (IH) and morse taper connection (MT). Methods: The three-dimensional model was composed of trabecular and cortical bone, a crown, an extra-short dental implant and their components. An axial load of 150 N was applied and another inclined 30° with the same magnitude. Results: Stress concentrations on the IH implant are observed in the region of the first threads for the screw. However, in the MT implant the highest stress occurs at the edges of the upper implant platform. Conclusions: In view of the results obtained in this study the two types of prosthetic fittings present a good stress distribution. The Morse taper connections presented better behavior than the internal in both loading configurations.

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Comparative Stress Evaluation between Bilayer, Monolithic and Cutback All-Ceramic Crown Designs: 3D Finite Element Study

Prosthesis ◽

10.3390/prosthesis3020017 ◽

2021 ◽

Vol 3 (2) ◽

pp. 173-180

Author(s):

Nathália de Carvalho Ramos ◽

Gabriela Freitas Ramos ◽

Marcela Moreira Penteado ◽

Renata Marques de Melo ◽

Alexandre Luiz Souto Borges ◽

...

Keyword(s):

Finite Element ◽

Stress Distribution ◽

Mechanical Response ◽

Three Dimensional ◽

Maximum Principal Stress ◽

Mechanical Analysis ◽

Element Analysis ◽

All Ceramic ◽

Homogeneous Stress ◽

Ceramic Crown

Different all-ceramic crown designs are available to perform indirect restoration; however, the mechanical response of each model should still be elucidated. The study aims to evaluate the stress distribution in three different zirconia crown designs using finite element analysis. Different three-dimensional molar crowns were simulated: conventional bilayer zirconia covered with porcelain, a monolithic full-contour zirconia crown, and the cutback modified zirconia crown with porcelain veneered buccal face. The models were imported to the computer-aided engineering (CAE) software. Tetrahedral elements were used to form the mesh and the mechanical properties were assumed as isotropic, linear and homogeneous materials. The contacts were considered ideal. For the static structural mechanical analysis, 100 N occlusal load was applied and the bone tissue was fixed. Maximum principal stress showed that the stress pattern was different for the three crown designs, and the traditional bilayer model showed higher stress magnitude comparing to the other models. However, grayscale stress maps showed homogeneous stress distribution for all models. The all-ceramic crown designs affect the stress distribution, and the cutback porcelain-veneered zirconia crown can be a viable alternative to adequate function and esthetic when the monolithic zirconia crown cannot be indicated.

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Influence of Occlusal Contact Area on Cusp Deflection and Stress Distribution

The Journal of Contemporary Dental Practice ◽

10.5005/jp-journals-10024-1602 ◽

2014 ◽

Vol 15 (6) ◽

pp. 699-704 ◽

Cited By ~ 2

Author(s):

Anna Karina Figueiredo Costa ◽

Thaty Aparecida Xavier ◽

Tarcisio José Arruda Paes-Junior ◽

Oswaldo Daniel Andreatta-Filho ◽

Alexandre Luiz Souto Borges

Keyword(s):

Stress Distribution ◽

Contact Area ◽

Three Dimensional ◽

Great Influence ◽

Maximum Principal Stress ◽

Occlusal Surface ◽

Load Application ◽

Element Analysis ◽

Occlusal Contact ◽

Contact Areas

ABSTRACT Objective The purpose of this study was to evaluate the effect of occlusal contact area for loading on the cuspal deflection and stress distribution in a first premolar restored with a high elastic modulus restorative material. Materials and methods The Rhinoceros 4.0 software was used for modeling the three-dimensional geometries of dental and periodontal structures and the inlay restoration. Thus, two different models, intact and restored teeth with three occlusal contact areas, 0.1, 0.5 and 0.75 mm2, on enamel at the occlusal surface of buccal and lingual cusps. Finite element analysis (FEA) was performed with the program ANSYS (Workbench 13.0), which generated a mesh with tetrahedral elements with greater refinement in the regions of interest, and was constrained at the bases of cortical and trabecular bone in all axis and loaded with 100 N normal to each contact area. Results To analysis of maximum principal stress, the smaller occlusal contact area showed greater compressive stress in region of load application for both the intact and inlay restored tooth. However, tensile stresses at the occlusal isthmus were similar for all three tested occlusal contact areas (60 MPa). To displacement of the cusps was higher for teeth with inlay (0.46- 0.48 mm). For intact teeth, the smaller contact area showed greater displacement (0.10 mm). For teeth with inlays, the displacement of the cusps were similar in all types of occlusal area. Conclusion Cuspal displacement was higher in the restored tooth when compared to the intact tooth, but there were no significant variations even with changes in the occlusal contact area. Relevance clinical Occlusal contacts have a great influence on the positioning of teeth being able to maintain the position and stability of the mandible. Axial loads would be able to generate more uniform stress at the root presenting a greater concentration of load application in the point and the occlusal surface. Thus, is necessary to analyze the relationship between these occlusal contacts as dental wear and subsequent occlusal interferences. How to cite this article Costa AKF, Xavier TA, Paes-Junior TJA, Andreatta-Filho OD, Borges ALS. Influence of Occlusal Contact Area on Cusp Deflection and Stress Distribution. J Contemp Dent Pract 2014;15(6):699-704.

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Evaluation of the stress distribution in the cortical bone caused by variations in implant applications in patients with bruxism: A three-dimensional finite element analysis

International Dental Research ◽

10.5577/intdentres.2021.vol11.suppl1.27 ◽

2021 ◽

Vol 11 (Suppl. 1) ◽

pp. 194-200

Author(s):

Yakup Kantaci ◽

Sabiha Zelal Ülkü

Keyword(s):

Finite Element ◽

Stress Distribution ◽

Cortical Bone ◽

Principal Stress ◽

Three Dimensional ◽

Maximum Principal Stress ◽

Element Analysis ◽

Minimum Principal Stress ◽

Dimensional Finite Element ◽

Three Dimensional Finite Element

Aim: To evaluate the stress distribution in the cortical bone under parafunctional forces with different occlusal thicknesses, monolithic zirconia with different implant diameters, and number variations in implant-supported fixed prosthetic restorations applied in patients with bruxism. Methodology: The tomographic sections of the previously registered mandible were used in order to model the mandible. Modeled bone height is 30 mm, cortical bone thickness is 1.5 mm, and trabecular bone thickness is modeled as 13 mm. By placing two implants in the created bone model, a three-member main model (Group 1), the number of implants was increased, three implants supported the Group 2 models, the diameter of the implants was increased, and the Group 3 models were created. The created Group 1, 2, 3 models, the occlusal thickness was divided into subgroups with 1.0, 1.5, and 2.0 mm, respectively (Groups A, B, and C). The groups were applied in two directions: vertical and 30o oblique. Stress values under forces were analyzed by finite element stress analysis. Results: Under vertical loading, the maximum principal stress value in the cortical bone was found to be lowest in Group 2C, and the highest maximum principal stress value was found in Group 1A. The minimum principal stress value in the cortical bone was found to be the lowest in Group 3C, and the highest minimum principal stress value was found in Group 1A. Under oblique loading, the maximum principal stress value in the cortical bone was found to be the lowest in Group 3C and the highest maximum principal stress value was found in Group 1A. The minimum principal stress value in the cortical bone was found to be lowest in Group 3C, and the highest minimum principal stress value was found in Group1A. Conclusion: Stresses caused by oblique forces are more than vertical forces. Increasing the occlusal thickness of the implant fixed prosthesis material, implant diameter, and number reduce the minimum and maximum principal stress values in the cortical How to cite this article: Kantaci Y, Ülkü SZ. Evaluation of the stress distribution in the cortical bone caused by variations in implant applications in patients with bruxism: A three-dimensional finite element analysis. Int Dent Res 2021;11(Suppl.1):194-200. https://doi.org/10.5577/intdentres.2021.vol11.suppl1.27 Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.

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Influence of Fiber Post Cementation Length on Coronal Microleakage Values in vitro and Finite Element Analysis

The Journal of Contemporary Dental Practice ◽

10.5005/jp-journals-10024-1560 ◽

2014 ◽

Vol 15 (4) ◽

pp. 444-450 ◽

Cited By ~ 1

Author(s):

César Dalmolin Bergoli ◽

Rodrigo Furtado de Carvalho ◽

Ivan Balducci ◽

Josete Barbosa Cruz Meira ◽

Maria Amélia Máximo de Araújo ◽

...

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Stress Distribution ◽

Principal Stress ◽

Maximum Principal Stress ◽

Fiber Post ◽

Element Analysis ◽

Mechanical Cycling ◽

Fiber Posts

ABSTRACT Aim This study aims to evaluate, the influence of different fiber posts cementation lengths by finite element analysis (FEA) and coronal microleakage. Materials and methods Fifty anterior bovine teeth were sectioned to obtain roots with 16 mm length. The coronal length of the post was 6 mm for all groups, while the radicular length were varied 6, 8, 10 or 12 mm. The fiber posts surfaces were cleaned with alcohol and silanized. Then the posts were cemented using a two steps total etch-and-rinse adhesive system + conventional resin cement. Forty teeth were submitted to mechanical cycling (45°; 2.000.000 cycles; 90N; 4Hz; 37°C) and ten teeth with radicular length of 12 mm was not submitted, serving as control. So, the experimental design was composed by different ratios of post coronal length/post radicular length and mechanical cycling (MC): Gr1- 1/1 + MC; Gr2- 3/4 + MC; Gr3- 3/5 + MC; Gr4- 1/2 + MC. All groups were immersed in a 1% toluidine blue solution. After 24 hours, the teeth were longitudinally sectioned and the microleakage scores was given by a blind operator. Data were submitted to Kruskal-Wallis test (p = 0.05). The experimental variables were simulated in twodimensional finite element analysis (2D-FEA). The maximum principal stress distributions were compared. Results No difference was observed in microleakage values between the cycled groups, whilst the control groups showed the lowest values. FEA analysis showed similar maximum principal stress distribution between the groups. Conclusion Mechanical cycling affected the values of coronal microleakage and different cementation length generated similar values of coronal microleakage and stress distribution. Clinical significance These results showed that from the microleakage point of view, more conservative cementation lengths have the same effect as longer cementation lengths. How to cite this article Bergoli CD, de Carvalho RF, Balducci I, Meira JBC, de Araújo MAM, Valera MC. Influence of Fiber Post Cementation Length on Coronal Microleakage Values in vitro and Finite Element Analysis. J Contemp Dent Pract 2014; 15(4):444-450.

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