Short implants to support mandibular complete dentures - photoelastic analysis

This study evaluated the stress behavior around short implants in edentulous atrophic mandibles. Six groups included implants with two diameters regular and wide (4 and 5 mm) and three lengths (5, 7 and 9 mm) as follows: Ci9 (9 x 4 mm), Ci7 (7 x 4 mm), Ci5 (5 x 4 mm), Wi9 (9 x 5 mm), Wi7 (7 x 5 mm)...

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Bibliographic Details
Published in:Brazilian oral research 2017-01, Vol.31, p.e18-e18
Main Authors: Pimentel, Marcele Jardim, Silva, Wander José da, Del Bel Cury, Altair Antoninha
Format: Article
Language:English
Subjects:
Analysis of Variance
Biomechanical Phenomena
Bone Resorption
Complete
Dental Abutments
Dental Implants
Dental Models
Dental Prosthesis Design
Dental Prosthesis, Implant-Supported - methods
Dental Stress Analysis - methods
Dentistry
DENTISTRY, ORAL SURGERY & MEDICINE
Denture
Denture, Complete, Lower
Elasticity
Materials Testing
Reference Values
Shear Strength
Stress, Mechanical
Weight-Bearing
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Summary:This study evaluated the stress behavior around short implants in edentulous atrophic mandibles. Six groups included implants with two diameters regular and wide (4 and 5 mm) and three lengths (5, 7 and 9 mm) as follows: Ci9 (9 x 4 mm), Ci7 (7 x 4 mm), Ci5 (5 x 4 mm), Wi9 (9 x 5 mm), Wi7 (7 x 5 mm) and Wi5 (5 x 5 mm). These groups were compared to the control group CG (11 x 4 mm). The analysis was performed with the photoelastic method (n = 6). Each model comprised 4 implants with the same length and diameter connected by a chromium-cobalt bar that simulates a fixed denture. A 0.15 kg force was applied at the end of the cantilever (15 mm), and the maximum shear stress was recorded around the distal and subsequent implants. The stress values were determined, and the quantitative data (Fringes®) were submitted to statistical analysis with one-way ANOVA and the Dunnett test (p < 0.05). It was observed that the reduction in implant length increased stress values with a significant difference (p < 0.05) between CG Ci7 and Ci5, while the increase in implant diameter reduced the stress values without any differences found between short and long implants. Implants with 5 and 7 mm with regular diameter increased stress levels while short implants with larger diameters experienced similar stress to that of longer implants.
ISSN:1806-8324
1807-3107
1807-3107
1806-8324
DOI:10.1590/1807-3107BOR-2017.vol31.0018