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Influence of restorative technique on the biomechanical behavior of endodontically treated maxillary premolars. Part II: strain measurement and stress distribution.
J Prosthet Dent. 2008 Feb; 99(2):114-22.JP

Abstract

STATEMENT OF PROBLEM

Unresolved controversy exists concerning the preferred cavity design and restorative technique used to restore endodontically treated maxillary premolars to minimize strain and improve stress distribution under occlusal load.

PURPOSE

The purpose of this study was to analyze the influence of cavity design and restorative material on strain measurement and stress distribution in maxillary premolars under occlusal loading conditions, and correlate these influences with the failure modes analyzed in Part I.

MATERIAL AND METHODS

For the strain gauge test, 21 additional specimens were prepared as described in Part 1 of this study (n=3). Two strain gauges were fixed on the buccal (B) and palatal (P) cusps of each specimen with cyanoacrylate adhesive. The specimens were submitted to continuous axial compression loading at a speed of 0.5 mm/min, using a 6-mm sphere, to a maximum limit of 150 N in a universal testing machine. Total strain values were obtained by combining the B and P cusp strain values. These values were submitted to 2-way ANOVA and the Dunnet test (alpha=.05). For finite element analyses, 7 numerical 2-D models were generated: MODd, direct mesio-occlusal-distal preparation; MODi, indirect mesio-occlusal-distal preparation; AM, MODd restored with amalgam; CR, MODd restored with composite resin; LPR, MODi restored with laboratory-processed composite resin; and LGC, MODi restored with leucite-reinforced glass ceramic; each corresponding to 1 of the experimental groups tested in Part I of this study. The models were analyzed with finite element software, using the von Mises criteria for stress distribution analysis.

RESULTS

With the strain gauge test, MODd, MODi, and AM groups showed significantly higher strain values than the CR, LPR, and LGC. Finite element analyses revealed that tooth structure removal and the type of restorative material altered the stress distribution pattern. The MODd, MODi, AM, and LPR models showed higher stress concentration within the tooth structure.

CONCLUSIONS

The specimens with adhesive restorations were shown to behave in a manner similar to the biomechanical behavior of healthy teeth, while the behavior of those restored with amalgam restorations was more like that observed for teeth with nonrestored cavity preparations. These results directly correlate with the fracture mode results obtained in Part I of this study.

Links

Publisher Full Text (DOI)

Authors+Show Affiliations

Soares PV
Biomechanical Group, Dentistry and Dental Materials, School of Dentistry, Federal University of Uberlandia, Minas Gerais, Brazil.
Santos-Filho PC
No affiliation info available
Gomide HA
No affiliation info available
Araujo CA
No affiliation info available
Martins LR
No affiliation info available
Soares CJ
No affiliation info available

MeSH

Aluminum SilicatesBicuspidBiomechanical PhenomenaBite ForceComposite ResinsCopperDental AmalgamDental Cavity PreparationDental MaterialsDental PorcelainDental Restoration FailureDental Restoration, PermanentFinite Element AnalysisGlassHumansMaxillaSilverStress, MechanicalTooth FracturesTooth, Nonvital

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

18262012

Citation

Soares, Paulo Vinicius, et al. "Influence of Restorative Technique On the Biomechanical Behavior of Endodontically Treated Maxillary Premolars. Part II: Strain Measurement and Stress Distribution." The Journal of Prosthetic Dentistry, vol. 99, no. 2, 2008, pp. 114-22.
Soares PV, Santos-Filho PC, Gomide HA, et al. Influence of restorative technique on the biomechanical behavior of endodontically treated maxillary premolars. Part II: strain measurement and stress distribution. J Prosthet Dent. 2008;99(2):114-22.
Soares, P. V., Santos-Filho, P. C., Gomide, H. A., Araujo, C. A., Martins, L. R., & Soares, C. J. (2008). Influence of restorative technique on the biomechanical behavior of endodontically treated maxillary premolars. Part II: strain measurement and stress distribution. The Journal of Prosthetic Dentistry, 99(2), 114-22. https://doi.org/10.1016/S0022-3913(08)60027-X
Soares PV, et al. Influence of Restorative Technique On the Biomechanical Behavior of Endodontically Treated Maxillary Premolars. Part II: Strain Measurement and Stress Distribution. J Prosthet Dent. 2008;99(2):114-22. PubMed PMID: 18262012.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Influence of restorative technique on the biomechanical behavior of endodontically treated maxillary premolars. Part II: strain measurement and stress distribution. AU - Soares,Paulo Vinicius, AU - Santos-Filho,Paulo Cesar Freitas, AU - Gomide,Henner Alberto, AU - Araujo,Cleudmar Amaral, AU - Martins,Luis Roberto Marcondes, AU - Soares,Carlos Jose, PY - 2008/2/12/pubmed PY - 2008/5/9/medline PY - 2008/2/12/entrez SP - 114 EP - 22 JF - The Journal of prosthetic dentistry JO - J Prosthet Dent VL - 99 IS - 2 N2 - STATEMENT OF PROBLEM: Unresolved controversy exists concerning the preferred cavity design and restorative technique used to restore endodontically treated maxillary premolars to minimize strain and improve stress distribution under occlusal load. PURPOSE: The purpose of this study was to analyze the influence of cavity design and restorative material on strain measurement and stress distribution in maxillary premolars under occlusal loading conditions, and correlate these influences with the failure modes analyzed in Part I. MATERIAL AND METHODS: For the strain gauge test, 21 additional specimens were prepared as described in Part 1 of this study (n=3). Two strain gauges were fixed on the buccal (B) and palatal (P) cusps of each specimen with cyanoacrylate adhesive. The specimens were submitted to continuous axial compression loading at a speed of 0.5 mm/min, using a 6-mm sphere, to a maximum limit of 150 N in a universal testing machine. Total strain values were obtained by combining the B and P cusp strain values. These values were submitted to 2-way ANOVA and the Dunnet test (alpha=.05). For finite element analyses, 7 numerical 2-D models were generated: MODd, direct mesio-occlusal-distal preparation; MODi, indirect mesio-occlusal-distal preparation; AM, MODd restored with amalgam; CR, MODd restored with composite resin; LPR, MODi restored with laboratory-processed composite resin; and LGC, MODi restored with leucite-reinforced glass ceramic; each corresponding to 1 of the experimental groups tested in Part I of this study. The models were analyzed with finite element software, using the von Mises criteria for stress distribution analysis. RESULTS: With the strain gauge test, MODd, MODi, and AM groups showed significantly higher strain values than the CR, LPR, and LGC. Finite element analyses revealed that tooth structure removal and the type of restorative material altered the stress distribution pattern. The MODd, MODi, AM, and LPR models showed higher stress concentration within the tooth structure. CONCLUSIONS: The specimens with adhesive restorations were shown to behave in a manner similar to the biomechanical behavior of healthy teeth, while the behavior of those restored with amalgam restorations was more like that observed for teeth with nonrestored cavity preparations. These results directly correlate with the fracture mode results obtained in Part I of this study. SN - 0022-3913 UR - https://www.unboundmedicine.com/medline/citation/18262012/Influence_of_restorative_technique_on_the_biomechanical_behavior_of_endodontically_treated_maxillary_premolars__Part_II:_strain_measurement_and_stress_distribution_ DB - PRIME DP - Unbound Medicine ER -