Retention and stress distribution in distal extension removable partial dentures with and without implant association

Autor(es)

Silveira Rodrigues, Renata Cristina ^[1] ; Lapria Faria, Adriana Claudia ^[1] ; Macedo, Ana Paula ^[1] ; Chiarello de Mattos, Maria da Gloria ^[1] ; Ribeiro, Ricardo Faria ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dent Sch Ribeirao Preto, Dept Dent Mat & Prosthodont, BR-14040904 Ribeirao Preto, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PROSTHODONTIC RESEARCH; v. 57, n. 1, p. 24-29, JAN 2013.
• Citações Web of Science: 5

Resumo

Purpose: The present study aimed to evaluate the retention and stress distribution of conventional (C) RPD and compare to RPD associated to implant for support (IS) and retention (IR). Methods: Frameworks were cast from cp Ti (n = 18) and Co-Cr alloy (n = 18) by plasma and injected by vacuum-pressure. Conventional RPDs were compared to implant associated RPDs using a distal implant to support (IS) or to support and retain (IR) RPD. The specimens were subjected to insertion/removal cycles simulating 5 years of use and the retention force (N) was measured or evaluated. A mixed linear model was used to analyze the data (a = 0.05). Photoelastic models were qualitatively examined for stress when an occlusal load of 15 kgf was applied over support teeth and RPD. Results: Retention force of IR RPDs is greater than IS and C RPDs for both cp Ti and Co-Cr alloy specimens. Retention force of cp Ti RPDs increased initially and was maintained throughout 5 years of simulation test while Co-Cr RPDs presented a decrease at the beginning of the test and had their retention force maintained throughout the test. Implant placement at residual alveolar ridge decreased stress around teeth, mainly in the first premolar. Stress concentration in the IS RPD is slightly greater than in the IR RPD. Conclusion: The results suggest that implant placement at the distal extension improves retention and stress distribution of RPDs. (C) 2012 Japan Prosthodontic Society. Published by Elsevier Ireland. All rights reserved. (AU)

• Processo FAPESP: 06/57559-6 - Avaliação da retenção e da transmissão de carga em PPRs de extremidade livre associadas a implante ósseointegrado na região distal, com e sem uso de attachment: estudo de simulação de uso e análise fotoelástica
• Beneficiário: Renata Cristina Silveira Rodrigues Ferracioli
• Modalidade de apoio: Auxílio à Pesquisa - Regular