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Structure and mechanical properties of Cresco-Ti laser-welded joints and stress analyses using finite element models of fixed distal extension and fixed partial prosthetic designs.
J Prosthet Dent. 2005 Mar; 93(3):235-44.JP

Abstract

STATEMENT OF PROBLEM

The Cresco-Ti System uses a laser-welded process that provides an efficient technique to achieve passive fit frameworks. However, mechanical behavior of the laser-welded joint under biomechanical stress factors has not been demonstrated.

PURPOSE

This study describes the effect of Cresco-Ti laser-welding conditions on the material properties of the welded specimen and analyzes stresses on the weld joint through 3-dimensional finite element models (3-D FEM) of implant-supported fixed dentures with cantilever extensions and fixed partial denture designs.

MATERIAL AND METHODS

Twenty Grade III (ASTM B348) commercially pure titanium specimens were machine-milled to the dimensions described in the EN10002-1 tensile test standard and divided into test (n = 10) and control (n = 10) groups. The test specimens were sectioned and laser-welded. All specimens were subjected to tensile testing to determine yield strength (YS), ultimate tensile strength (UTS), and percent elongation (PE). The Knoop micro-indentation test was performed to determine the hardness of all specimens. On welded specimens, the hardness test was performed at the welded surface. Data were analyzed with the Mann-Whitney U test and Student's t test (alpha=.05). Fracture surfaces were examined by scanning electron microscopy to characterize the mode of fracture and identify defects due to welding. Three-dimensional FEMs were created that simulated a fixed denture with cantilever extensions supported by 5 implants (M1) and a fixed partial denture supported by 2 implants (M2), 1 of which was angled 30 degrees mesio-axially. An oblique load of 400 N with 15 degrees lingual-axial inclinations was applied to both models at various locations.

RESULTS

Test specimens fractured between the weld and the parent material. No porosities were observed on the fractured surfaces. Mean values for YS, UTS, PE, and Knoop hardness were 428 +/- 88 MPa, 574 +/- 113 MPa, 11.2 +/- 0.4%, 270 +/- 17 KHN, respectively, for the control group and 642 +/- 2 MPa, 772 +/- 72 MPa, 4.8 +/- 0.7%, 353 +/- 23 KHN, respectively, for the test group. The differences between the groups were significant for all mechanical properties (P <.05). For both models, the FEA revealed that maximum principal stresses were concentrated at the framework-weld junction but did not exceed the UTS of the weld joint.

CONCLUSION

Within the constraints of the finite element models, mechanical failure of the welded joint between the support and the framework may not be expected under biomechanical conditions simulated in this study.

Authors+Show Affiliations

Uysal H
Department of Prosthodontics, Faculty of Dentistry, Cukurova University, Adana, Turkey. hakanu@cu.edu.tr
Kurtoglu C
No affiliation info available
Gurbuz R
No affiliation info available
Tutuncu N
No affiliation info available

MeSH

Computer SimulationDental MaterialsDental Prosthesis, Implant-SupportedDental SolderingDenture DesignDenture, Partial, FixedElasticityFinite Element AnalysisHardnessHumansImaging, Three-DimensionalLasersMaterials TestingMicroscopy, Electron, ScanningModels, ChemicalPorosityStress, MechanicalSurface PropertiesTensile StrengthTitanium

Pub Type(s)

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

Language

eng

PubMed ID

15775924

Citation

Uysal, Hakan, et al. "Structure and Mechanical Properties of Cresco-Ti Laser-welded Joints and Stress Analyses Using Finite Element Models of Fixed Distal Extension and Fixed Partial Prosthetic Designs." The Journal of Prosthetic Dentistry, vol. 93, no. 3, 2005, pp. 235-44.
Uysal H, Kurtoglu C, Gurbuz R, et al. Structure and mechanical properties of Cresco-Ti laser-welded joints and stress analyses using finite element models of fixed distal extension and fixed partial prosthetic designs. J Prosthet Dent. 2005;93(3):235-44.
Uysal, H., Kurtoglu, C., Gurbuz, R., & Tutuncu, N. (2005). Structure and mechanical properties of Cresco-Ti laser-welded joints and stress analyses using finite element models of fixed distal extension and fixed partial prosthetic designs. The Journal of Prosthetic Dentistry, 93(3), 235-44.
Uysal H, et al. Structure and Mechanical Properties of Cresco-Ti Laser-welded Joints and Stress Analyses Using Finite Element Models of Fixed Distal Extension and Fixed Partial Prosthetic Designs. J Prosthet Dent. 2005;93(3):235-44. PubMed PMID: 15775924.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Structure and mechanical properties of Cresco-Ti laser-welded joints and stress analyses using finite element models of fixed distal extension and fixed partial prosthetic designs. AU - Uysal,Hakan, AU - Kurtoglu,Cem, AU - Gurbuz,Riza, AU - Tutuncu,Naki, PY - 2005/3/19/pubmed PY - 2005/4/22/medline PY - 2005/3/19/entrez SP - 235 EP - 44 JF - The Journal of prosthetic dentistry JO - J Prosthet Dent VL - 93 IS - 3 N2 - STATEMENT OF PROBLEM: The Cresco-Ti System uses a laser-welded process that provides an efficient technique to achieve passive fit frameworks. However, mechanical behavior of the laser-welded joint under biomechanical stress factors has not been demonstrated. PURPOSE: This study describes the effect of Cresco-Ti laser-welding conditions on the material properties of the welded specimen and analyzes stresses on the weld joint through 3-dimensional finite element models (3-D FEM) of implant-supported fixed dentures with cantilever extensions and fixed partial denture designs. MATERIAL AND METHODS: Twenty Grade III (ASTM B348) commercially pure titanium specimens were machine-milled to the dimensions described in the EN10002-1 tensile test standard and divided into test (n = 10) and control (n = 10) groups. The test specimens were sectioned and laser-welded. All specimens were subjected to tensile testing to determine yield strength (YS), ultimate tensile strength (UTS), and percent elongation (PE). The Knoop micro-indentation test was performed to determine the hardness of all specimens. On welded specimens, the hardness test was performed at the welded surface. Data were analyzed with the Mann-Whitney U test and Student's t test (alpha=.05). Fracture surfaces were examined by scanning electron microscopy to characterize the mode of fracture and identify defects due to welding. Three-dimensional FEMs were created that simulated a fixed denture with cantilever extensions supported by 5 implants (M1) and a fixed partial denture supported by 2 implants (M2), 1 of which was angled 30 degrees mesio-axially. An oblique load of 400 N with 15 degrees lingual-axial inclinations was applied to both models at various locations. RESULTS: Test specimens fractured between the weld and the parent material. No porosities were observed on the fractured surfaces. Mean values for YS, UTS, PE, and Knoop hardness were 428 +/- 88 MPa, 574 +/- 113 MPa, 11.2 +/- 0.4%, 270 +/- 17 KHN, respectively, for the control group and 642 +/- 2 MPa, 772 +/- 72 MPa, 4.8 +/- 0.7%, 353 +/- 23 KHN, respectively, for the test group. The differences between the groups were significant for all mechanical properties (P <.05). For both models, the FEA revealed that maximum principal stresses were concentrated at the framework-weld junction but did not exceed the UTS of the weld joint. CONCLUSION: Within the constraints of the finite element models, mechanical failure of the welded joint between the support and the framework may not be expected under biomechanical conditions simulated in this study. SN - 0022-3913 UR - https://www.unboundmedicine.com/medline/citation/15775924/Structure_and_mechanical_properties_of_Cresco_Ti_laser_welded_joints_and_stress_analyses_using_finite_element_models_of_fixed_distal_extension_and_fixed_partial_prosthetic_designs_ DB - PRIME DP - Unbound Medicine ER -