Photoelastic analysis to compare implant-retained and conventional obturator dentures.
The use of photoelastic analysis contributes to the rehabilitation of patients with oral-sinus-nasal sequelae, which in turn affect important functions such as chewing, swallowing, and speech. The prosthetic rehabilitation with implant-retained dentures is a suitable treatment option. The purpose of this study was to verify, by using a photoelastic analysis, the stress distribution in implant-retained palatal obturator dentures (relined or not) associated with different attachment systems (O-ring, bar-clip, and bar-clip associated with distally placed O-rings). Two photoelastic models were obtained from an experimental maxillary cast presenting an oral-nasal communication. One model had two 13-mm length implants placed on the left region. A total of eight colorless maxillary obturators were fabricated and subsequently four of them were relined with soft silicone soft, and three had attachment systems associated. The assembly (model/attachment system/prosthesis) was positioned in a circular polariscope and a 100-N load was applied at 10 mm/s. The results showed that the denture relining influenced the distribution and amount of stress on the models. The O-ring group displayed the lowest stress levels, followed by bar-clip system associated with distally placed O-rings and bar-clip groups.
UNESP, Araçatuba Dental School, Department of Dental Materials and Prosthodontics, São Paulo 16015-050, Brazil. goiato@foa.unesp.br
Marcelo Coelho
MC
Goiato
Paula do Prado
Pdo P
Ribeiro
Eduardo Piza
EP
Pellizzer
Aldiéris Alves
AA
Pesqueira
Marcela Filiè
MF
Haddad
Daniela Micheline
DM
dos Santos
Amália
A
Moreno
D000180:Acrylic Resins / Q000737:chemistry; D017266:Dental Prosthesis; D019094:Dental Prosthesis, Implant-Supported; D003799:Dental Stress Analysis / Q000379:methods*; D003778:Dentures; D004548:Elasticity; D006801:Humans; D008027:Light; D008409:Mastication; D008422:Materials Testing; D008437:Maxilla; D008953:Models, Anatomic; D003765:Models, Dental; D055095:Optics and Photonics / Q000379:methods; D010158:Palatal Obturators; D013314:Stress, Mechanical
D000180:Acrylic Resins