A photoelastic and strain gauge comparison of two attachments for obturator prostheses

Autor: Rodrigo Antonio de Medeiros, Daniela Micheline dos Santos, Matheus Hr, Aldiéris Alves Pesqueira, Marcelo Coelho Goiato, Sandro Basso Bitencourt
Přispěvatelé: Universidade Estadual Paulista (Unesp)
Rok vydání: 2017
Předmět:
Zdroj: Scopus
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
ISSN: 0022-3913
DOI: 10.1016/j.prosdent.2016.07.025
Popis: Made available in DSpace on 2018-12-11T17:30:34Z (GMT). No. of bitstreams: 0 Previous issue date: 2017-05-01 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Statement of problem The rehabilitation of patients after a maxillectomy involves the use of an obturator to seal oral-nasal-sinus communication and to facilitate mastication, swallowing, and speech. Purpose The purpose of this in vitro study was to evaluate different attachment systems used for implant-retained obturators at dissipation loads and under shear forces. Material and methods Photoelastic models were fabricated with 3 external hexagon implants at the incisor, canine, and first molar regions. Subsequently, overdentures were made, and metal hooks were placed at the incisor and first molar regions to displace the prostheses in the vertical, anterior, and posterior directions, with a constant speed of 50 mm/min. A photoelastic model with an O-ring or bar-clip system was placed in a circular polariscope, and tested with a universal testing machine. The images were recorded and high-intensity fringes were counted using software. For strain gauge analysis, each strain gauge was placed horizontally at the mesial and distal sides of the implants. The registered strains were submitted to 2-way ANOVA (α=.05). Results The O-ring showed the lowest number of high-intensity fringes in photoelastic imaging, while the strain gauge analysis showed the lowest stress values in the bar-clip group (P=.007). Conclusions The stress around titanium implant necks was more damaging to surrounding bone, while the bar-clip attachment system had a better biomechanical performance. The bar-clip presented the lowest strain values around the dental implants and few high-intensity fringes. Professor Aracatuba Dental School São Paulo State University (UNESP) Graduate student Aracatuba Dental School Sao Paulo State University (UNESP) Postgraduate student Aracatuba Dental School São Paulo State University (UNESP) Professor Aracatuba Dental School São Paulo State University (UNESP) Graduate student Aracatuba Dental School Sao Paulo State University (UNESP) Postgraduate student Aracatuba Dental School São Paulo State University (UNESP) FAPESP: 2014/04919-1
Databáze: OpenAIRE
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