Finite Element Stress Analysis of the Crowns of Normal and Restored Teeth

Yettram, A.L.; Wright, K.W.J.; Pickard, Hanna

doi:10.1177/00220345760550060201

Cited by 148 publications

(93 citation statements)

References 16 publications

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“…The compressive fracture strength (CFS) is the only strength test specified for inclusion in ISO 9917-1: 2003 -the international standard for powder/liquid acid-base cements and restoratives [1]. The selection of CFS for assessing powder/liquid acid-base cements and restoratives has previously been justified as a relevant indicator of applied service performance [2,3]. Investigators have suggested that loading during masticatory function results in stressing patterns analogous to those observed during CFS testing [2] and proposed that a high CFS was necessary to tolerate the functional forces routinely encountered in the posterior region of the mouth [3].…”

Section: Introductionmentioning

confidence: 99%

The crushing truth about glass ionomer restoratives: Exposing the standard of the standard

Fleming

Dowling

Addison

2012

Journal of Dentistry

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Objectives: The compressive fracture strength (CFS) test is the only strength test for glass ionomers (GIs) in ISO 9917-1: 2003. The CFS test was the subject of much controversy in 1990 and has been challenged over its appropriateness and reproducibility and the study aimed to revisit the suitability of the CFS test for GIs. Methods: Groups of 20 (four batches of n=5) cylinders (6.0±0.1 mm height, 4.0 ±0.1 mm diameter) of three encapsulated GIs were prepared for CFS testing using two mechanical mixing regimes and two operators. The CFS data for each GI restorative were pooled, three-, two-and one-way analyses of variance (ANOVAs) were conducted (p=0.05) for operator, mixing regime and batch to assess reliability. The data was also analysed according to ISO 9917-1: 2003. Results: The three-way ANOVAs showed a significant interaction of operator × mixing regime × batch (p<0.017) for two of the three encapsulated GIs. However, no significant effects of operator × mixing regime (p>0.042), operator × batch (p>0.332), mixing regime × batch (p>0.056), operator (p>0.094), mixing regime (p>0.118) or batch (p>0.054) were evident. When examined in batches of five (or ten where appropriate) as specified in ISO 9917-1: 2003, inter-and intra-operator variability were evident. Conclusions: The use of batch-censoring in accordance with ISO 9917-1: 2003 is unsafe when the data scatter reflects a homogenous flaw distribution as it misidentifies operative variability. Despite demonstrating that the CFS test can be performed reliably, the validity of the CFS test for GIs remains under scrutiny.

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Section: Introductionmentioning

confidence: 99%

The crushing truth about glass ionomer restoratives: Exposing the standard of the standard

Fleming

Dowling

Addison

2012

Journal of Dentistry

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“…Stress analysis was focused at the CEJ area of buccal and palatal surface based on the reports of many FEA studies 12,[23][24][25] . Kuroe et al 26) also confirmed by the photoelastic method that a vertical force loaded on the tooth causes stress concentration at the cervical line.…”

Section: ⅳ Discussionmentioning

confidence: 99%

Effect of restoration type on the stress distribution of endodontically treated maxillary premolars; Three-dimensional finite element study

Jung

Kim

Hur

et al. 2009

J Korean Acad Conserv Dent

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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

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“…Borcic et al 20) and Ichim et al 18) also went on an experiment with 200 N of loading. Therefore, stress range of intraoral loading seems to be within the value of 170 -200 N. In this study, a tooth model loaded by a point load of static 200 N was considered more representative of normal chewing load situation, in contrast to other FE analysis studies 23,[33][34][35] . Previous studies [18][19][20] were based on applying load on buccal cusp.…”

Section: ⅳ Discussionmentioning

confidence: 99%

The influence of occlusal loads on stress distribution of cervical composite resin restorations: A three-dimensional finite element study

Park

Hur

Kim

et al. 2008

J Korean Acad Conserv Dent

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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-DOC-TOR (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 ㎛). 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. [J Kor Acad Cons Dent 33(3):246-257, 2008]

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Finite Element Stress Analysis of the Crowns of Normal and Restored Teeth

Cited by 148 publications

References 16 publications

The crushing truth about glass ionomer restoratives: Exposing the standard of the standard

The crushing truth about glass ionomer restoratives: Exposing the standard of the standard

Effect of restoration type on the stress distribution of endodontically treated maxillary premolars; Three-dimensional finite element study

The influence of occlusal loads on stress distribution of cervical composite resin restorations: A three-dimensional finite element study

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