Three-dimensional finite element analysis of the stress distribution pattern in the design modifications of U-shaped palatal major connector

• Main Authors: Ramakrishnan Hariharan, Singh Raj
• Format: Article
• Language: English
• Published: Wolters Kluwer Medknow Publications 2010-01-01
• Series: Indian Journal of Dental Research
• Subjects: 3D finite element; stress; U-shaped major connector
• Online Access: http://www.ijdr.in/article.asp?issn=0970-9290;year=2010;volume=21;issue=4;spage=506;epage=511;aulast=Ramakrishnan

<b>Background:</b> The U-shaped maxillary major connector is considered to be the least-desirable design by many prosthodontists as it lacks rigidity, which is a primary requisite for a major connector. Aims and Objectives: Design modifications in the U-shaped palatal major connector are desired because it lacks rigidity. The study also aimed to determine the best design when a U-shaped palatal major connector is indicated for clinical use. <b>Materials and Methods:</b> The normal design and the design-modified models (modification 1, 2, 3, 4) were loaded at the functional cusps of the premolars and the molars with a magnitude of 200 N, 250 N and 300 N at angulations of 60 ^o and 90 ^o on both sides of the maxillary arch. Results for each loading were obtained as stress distribution colored images and numerical values were recorded. A three-dimensional finite element analysis study of the design-modified models was performed using two finite element softwares, namely PRO-E and IDEAS. <b>Results:</b> The least stress value of 7.86 Megapascals (MPa) at 200 N, 60 ^o was recorded for the double-thickness design, followed by design 1, which was 8.03 MPa. The least stress value for the palatal mucosa and ligament was provided by design modification 1 (0.5 mm-thick U-shaped connector, 9 mm anteroposteiorly, 14.6 mm laterally), which was 9.78 MPa and 2.98 MPa, respectively. <b> Conclusion:</b> The double-thickness group exhibited the least internal stress for the U-shaped major connector. However, it delivered the greatest stress to the palatal mucosa and the periodontal ligaments.