Photoelastic analysis of fixed partial prosthesis crown height and implant length on distribution of stress in two dental implant systems.
The aim of this study was to evaluate by photoelastic analysis stress distribution on short and long implants of two dental implant systems with 2-unit implant-supported fixed partial prostheses of 8 mm and 13 mm heights. Sixteen photoelastic models were divided into 4 groups: I: long implant (5 × 11 mm) (Neodent), II: long implant (5 × 11 mm) (Bicon), III: short implant (5 × 6 mm) (Neodent), and IV: short implants (5 × 6 mm) (Bicon). The models were positioned in a circular polariscope associated with a cell load and static axial (0.5 Kgf) and nonaxial load (15°, 0.5 Kgf) were applied to each group for both prosthetic crown heights. Three-way ANOVA was used to compare the factors implant length, crown height, and implant system (α = 0.05). The results showed that implant length was a statistically significant factor for both axial and nonaxial loading. The 13 mm prosthetic crown did not result in statistically significant differences in stress distribution between the implant systems and implant lengths studied, regardless of load type (P > 0.05). It can be concluded that short implants showed higher stress levels than long implants. Implant system and length was not relevant factors when prosthetic crown height were increased.
Department of Odontology, Unified University Center of Maranhão (UNICEUMA), 65.075-120 São Luís, MA, Brazil.
Evandro Portela
EP
Figueirêdo
Department of Oral and Maxillofacial Surgery, Piracicaba Dental School, P.O. Box 52, University of Campinas (UNICAMP), 13414-903 Piracicaba, SP, Brazil.
Eder Alberto
EA
Sigua-Rodriguez
Department of Prosthesis and Periodontology, Piracicaba Dental School, P.O. Box 52, University of Campinas (UNICAMP), 13414-903 Piracicaba, SP, Brazil.
Marcele Jardim
MJ
Pimentel
Department of Prosthesis and Periodontology, Piracicaba Dental School, P.O. Box 52, University of Campinas (UNICAMP), 13414-903 Piracicaba, SP, Brazil.
Ana Regina
0000-0003-3756-2675
AR
Oliveira Moreira
Department of Prosthesis and Periodontology, Piracicaba Dental School, P.O. Box 52, University of Campinas (UNICAMP), 13414-903 Piracicaba, SP, Brazil.
Mauro Antônio de Arruda
MA
Nóbilo
Department of Oral and Maxillofacial Surgery, Piracicaba Dental School, P.O. Box 52, University of Campinas (UNICAMP), 13414-903 Piracicaba, SP, Brazil.
José Ricardo
JR
de Albergaria-Barbosa