Effect of different fabrication methods of occlusal devices on periradicular stress distribution: A photoelastic analysis

2021 ◽  
Author(s):  
Luciana Paula Benício Arcas ◽  
Kusai Baroudi ◽  
Laís Regiane Silva-Concílio ◽  
Cristiane Aparecida de Assis Claro ◽  
Marina Amaral
Keyword(s):  
Stress Distribution ◽  
Photoelastic Analysis

Photoelastic Analysis on Different Retention Methods of Implant-Supported Prosthesis

2015 ◽  
Vol 41 (3) ◽  
pp. 258-263 ◽  
Author(s):  
Angélica Castro Pimentel ◽  
Marcello Roberto Manzi ◽  
Cristiane Ibanhês Polo ◽  
Claudio Luiz Sendyk ◽  
Maria da Graça Naclério-Homem ◽  
...  
Keyword(s):  
Stress Distribution ◽  
Axial Load ◽  
Testing Machine ◽  
Compressive Load ◽  
Lower Intensity ◽  
Photoelasticity Method ◽  
Universal Testing ◽  
Isochromatic Fringes ◽  
Photoelastic Analysis ◽  
Compressive Axial Load

The aim of this study was to evaluate the stress distribution of different retention systems (screwed, cemented, and mixed) in 5-unit implant-supported fixed partial dentures through the photoelasticity method. Twenty standardized titanium suprastructures were manufactured, of which 5 were screw retained, 5 were cement retained, and 10 were mixed (with an alternating sequence of abutments), each supported by 5 external hexagon (4.0 mm × 11.5 mm) implants. A circular polariscope was used, and an axial compressive load of 100 N was applied on a universal testing machine. The results were photographed and qualitatively analyzed. We observed the formation of isochromatic fringes as a result of the stresses generated around the implant after installation of the different suprastructures and after the application of a compressive axial load of 100 N. We conclude that a lack of passive adaptation was observed in all suprastructures with the formation of low-magnitude stress in some implants. When cemented and mixed suprastructures were subjected to a compressive load, they displayed lower levels of stress distribution and lower intensity fringes compared to the screwed prosthesis.

PHOTOELASTIC ANALYSIS OF STRESS DISTRIBUTION ON THE TIBIOFEMORAL JOINT AFTER MENISCECTOMY

Orthopedics ◽  
1992 ◽  
Vol 15 (12) ◽  
pp. 1445-1450
Author(s):  
Joo-Chul Ihn ◽  
Myun-Whan Ahn ◽  
Dae-Mang Kim
Keyword(s):  
Stress Distribution ◽  
Tibiofemoral Joint ◽  
Photoelastic Analysis

Photoelastic Analysis of Stress Distribution With Different Implant Systems

2014 ◽  
Vol 40 (2) ◽  
pp. 117-122 ◽  
Author(s):  
Eduardo Piza Pellizzer ◽  
Rafael Imai Carli ◽  
Rosse Mary Falcón-Antenucci ◽  
Fellippo Ramos Verri ◽  
Marcelo Coelho Goiato ◽  
...  
Keyword(s):  
Stress Concentration ◽  
Stress Distribution ◽  
Testing Machine ◽  
Load Direction ◽  
Mass Model ◽  
Load Model ◽  
Universal Testing ◽  
Isochromatic Fringes ◽  
Photoelastic Analysis ◽  
Oblique Load

The aim of this study was to evaluate stress distribution with different implant systems through photoelasticity. Five models were fabricated with photoelastic resin PL-2. Each model was composed of a block of photoelastic resin (10 × 40 × 45 mm) with an implant and a healing abutment: model 1, internal hexagon implant (4.0 × 10 mm; Conect AR, Conexão, São Paulo, Brazil); model 2, Morse taper/internal octagon implant (4.1 × 10 mm; Standard, Straumann ITI, Andover, Mass); model 3, Morse taper implant (4.0 × 10 mm; AR Morse, Conexão); model 4, locking taper implant (4.0 × 11 mm; Bicon, Boston, Mass); model 5, external hexagon implant (4.0 × 10 mm; Master Screw, Conexão). Axial and oblique load (45°) of 150 N were applied by a universal testing machine (EMIC-DL 3000), and a circular polariscope was used to visualize the stress. The results were photographed and analyzed qualitatively using Adobe Photoshop software. For the axial load, the greatest stress concentration was exhibited in the cervical and apical thirds. However, the highest number of isochromatic fringes was observed in the implant apex and in the cervical adjacent to the load direction in all models for the oblique load. Model 2 (Morse taper, internal octagon, Straumann ITI) presented the lowest stress concentration, while model 5 (external hexagon, Master Screw, Conexão) exhibited the greatest stress. It was concluded that Morse taper implants presented a more favorable stress distribution among the test groups. The external hexagon implant showed the highest stress concentration. Oblique load generated the highest stress in all models analyzed.

scholarly journals Effect of mucosa thicknesses on stress distribution of implant-supported overdentures under unilateral loading: Photoelastic analysis

2019 ◽  
Vol 17 (4) ◽  
pp. 228080001988264
Author(s):  
Ozgun Yusuf Ozyilmaz ◽  
Filiz Aykent ◽  
Gulsum Sayin Ozel
Keyword(s):  
Stress Distribution ◽  
Surrounding Tissue ◽  
Vertical Force ◽  
Test Models ◽  
Isochromatic Fringes ◽  
Mucosal Thickness ◽  
Photoelastic Analysis ◽  
Photoelastic Stress ◽  
The Right ◽  
Mandibular Overdenture

Introduction: The aim of this study was to evaluate the effect of different heights of attachment and mucosa thicknesses on the stress distribution of two implant-retained mandibular overdenture designs under loading using the photoelastic stress analysis method. Materials and methods: Six photoelastic models of an edentulous mandibula were fabricated with two solitary implants that were placed in the canine regions. The attachment systems studied were ball and locator stud attachments. Both the ball and locator groups included three models that had different residual ridge heights so as to provide different mucosa thicknesses (1 mm–1 mm, 1 mm–2 mm, 1 mm–4 mm). A static vertical force of 135 N was applied unilaterally (each on the right then the left side) to the central fossa of the first molars. Models were positioned in the field of a circular polariscope to observe the distribution of isochromatic fringes around the implants and the interimplant areas under loading. The photoelastic stress fringes were monitored and recorded photographically. Results: The ball attachment groups showed higher stress values than did the locator groups under loading. Both attachment systems produced the lowest stress values in stimulated 1 mm–1 mm mucosa thickness models. The models with 1 mm–2 mm mucosa thicknesses showed higher stress values than did other models for both attachment systems. The highest stress value observed around both attachment systems was the moderate level in all test models. Conclusion: In different height mucosa thicknesses, locator attachment models distributed the load to the other side of the implant and its surrounding tissue, whereas the ball attachment did not. Regardless of mucosal thickness and attachment type, the implant on the loading side was subjected to the highest stress concentration.

scholarly journals On an experimental method for the solution of plane stress problems

1936 ◽  
Vol 156 (889) ◽  
pp. 518-537 ◽  
Keyword(s):  
Stress Distribution ◽  
Experimental Method ◽  
Plane Stress ◽  
Mathematical Analysis ◽  
Experimental Methods ◽  
Photoelastic Analysis ◽  
Considerable Experience

1—Many cases of plane stress distribution which are of importance to the engineer, present problems of mathematical analysis which are intractable and it becomes necessary to rely for a solution either on approximations, which are often crude, or on experimental methods. Perhaps the best known of these experimental methods is that of photoelastic analysis developed by Coker and Filon ; but this requires a wellequipped laboratory and considerable experience in technique if reliable results are to be obtained.

Photoelastic analysis of the Stress distribution on an intervertebral disc

1989 ◽  
Vol 6 (2) ◽  
pp. 223
Author(s):  
Hyun Kug Shin ◽  
Jae Chang Lee ◽  
Myun Hwan Ahn ◽  
Jong Chul Ahn ◽  
Joo Chul Ihn
Keyword(s):  
Stress Distribution ◽  
Intervertebral Disc ◽  
Photoelastic Analysis

scholarly journals Photoelastic analysis of stress distribution on parallel and angled implants after installation of fixed prostheses

2004 ◽  
Vol 18 (1) ◽  
pp. 45-52 ◽  
Author(s):  
Cristiane Ueda ◽  
Roberto Adrian Markarian ◽  
Cláudio Luiz Sendyk ◽  
Dalva Cruz Laganá
Keyword(s):  
Stress Distribution ◽  
Apical Region ◽  
Axial Loads ◽  
Bone Morphology ◽  
Prosthetic Rehabilitation ◽  
Implant Placement ◽  
Isochromatic Fringes ◽  
Fixed Prosthesis ◽  
Photoelastic Analysis ◽  
Surrounding Bone

The longevity of implant-supported prosthetic rehabilitation depends largely on how the masticatory forces are transferred to the implants and surrounding bone. Anatomical conditions, bone morphology and aesthetics usually dictate implant placement in less than ideal positions for prosthetic rehabilitation and sometimes it is possible to find them with different inclinations. The purpose of this paper was to compare, through photoelastic analysis, the stress distribution in a fixed prosthesis with 3 parallel implants, to the stress distribution in the same prosthesis in the existence of an angled central implant. Two photoelastic resin models were made and a polariscope was used in the visualization of isochromatic fringes formed in the models when axial loads of 2 kg, 5 kg and 10 kg were applied to a unique central point of the prosthesis. The presence of inducted tensions (preloads) was observed in the models after applying torque to the retention screws. Preloads were intensified with the incidence of occlusal forces. In the parallel implants, the force dissipation followed the long axis. The angled implant had a smaller quantity of fringes and the stresses were located mostly around the apical region of the lateral implants.

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