Photoelasticity as a Research Technique for Analyzing Stresses in Dental Structures

Mahler, David B.; Peyton, F.A.

doi:10.1177/00220345550340060601

Cited by 100 publications

(67 citation statements)

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“…Despite the limitations, the method chosen for this study was the photoelastic analysis of strains, allowing the direct visualization of the regions of greatest stress has cost more accessible for other methods and allow the use of real structures. [24][25][26] Considering the qualitative analysis of the situation of load I, the results of this study showed lower concentration of tensions in the region around the cervical range of implant-abutment with IH and PS (Certain Prevail), which is in accordance to previous report, 23 and despite the different methods of analysis. The hypothesis in this study to explain this lower concentration was a change in the distribution of strain, it is more concentrated in the center of the implant with PS.…”

Section: Discussionsupporting

confidence: 90%

“…According to Mahler and Peyton (1955) 25 the results could be underestimated increasing the load and when using the photoelasticity to measure stress. Assuncao et al (2009), also warned to the low precision values when trying to quantify the stress using photoelasticity.…”

Section: Discussionmentioning

confidence: 99%

“…When the greater was the number of fringe order (N), or the number of fringes, greater was the magnitude of stress. 25,26 For quantitative analysis, the shear strain was determined in nine points of interest (POI) around each implant-abutment defined in a profile projector (Nikon 6C). Out of these points, six were in the cervical region around the implants and three in the apical region in accordance to Figure 1.…”

Section: Methodsmentioning

confidence: 99%

“…One of the experimental available techniques that can predict the mechanical response of a structure under an applied load is the photoelasticity, and this technique is based on the properties of transparent material that shows patterns of color with the stress distribution when viewed with polarized light. 24,25 Considering the scarcity of data in the literature considering the novel concept of platform switching, the aim of this study was to analyze qualitatively and quantitatively the stress distribution in the cervical and apical site of the implant-abutment with conventional connections (external hex -EH, internal hex -IH, cone morse-CM) and compare with the novel platform switching design (PS), using the method of photoelasticity reflection and two different load conditions.…”

mentioning

confidence: 99%

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Photoelastic Comparison of Single Tooth Implant-Abutment-Bone of Platform Switching vs Conventional Implant Designs

Rossi¹,

Zavanelli²,

Zavanelli³

2011

The Journal of Contemporary Dental Practice

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Objectives:The maintenance and stability of peri-implantar soft tissue seem to be related to the crestal bone around the implant platform and different implant designs connections might affect this phenomenon. The aim of this study was to evaluate by photoelastic analysis the stress distribution in the cervical and apical site of implant-abutment interface of conventional implant joints (external hex, internal hex and cone morse) and compare to the novel platform switching design. Materials and methods:It was fabricated photoelastic models using five different implant-abutment connection, one set of external hex (Alvim Ti, Neodent, Curitiba, Brazil), one set of internal hex (Full Osseotite, Biomet 3i, Florida, USA), one cone morse set (Alvim CM, Neodent, Curitiba, Brazil), and two sets of internal hex plus platform switching concept (Alvim II Plus, Neodent, Curitiba, Brazil) (Certain Prevail, Biomet 3i, Florida, USA). These models were submitted to two compressive loads, axial from 20 kgf (load I) and another (load II), inclined 45° from 10 kgf. During the qualitative analysis, digital pictures were taken from a polariscope, for each load situation. For the quantitative analyses in both situations of load, the medium, minimum and maximum in MPa values of shear strain were determined in the cervical and apical site. The Kruskal-Wallis test was used to compare the results between the different systems and between cervical and apical site were compared using Mann-Whitney U test. Results:The results from qualitative analysis showed less concentration of strain in the cervical area to the internal hex plus platform switching (Certain Prevail), in both situation of load. The same results were get in the quantitative analysis, showing less stress concentrations around the implant Certain Prevail with internal hex plus the novel design (17.9 MPa to load I and 29.5 MPa to load II), however, without statistical significant difference between the systems. Conclusion:The minor stress concentration strongly suggest the use of platform switching design as a manner to prevent bone loss around the implant-abutment platform.Clinical Significance: From the result of this study its possible to make clinical decision for implant system which provides implant components with platform switching characteristics.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Photoelastic Comparison of Single Tooth Implant-Abutment-Bone of Platform Switching vs Conventional Implant Designs

Rossi¹,

Zavanelli²,

Zavanelli³

2011

The Journal of Contemporary Dental Practice

View full text Add to dashboard Cite

show abstract

“…Late in the 1940s this method was used in the solution of dental problems with regard to structural design by Noonan [25], Castro, and King [26]. The general procedure is to construct a model of the structure to be investigated from what is known as a photoelastic material.…”

Section: Dental Applicationsmentioning

confidence: 99%