| Full text | |
| Author(s): |
Tiossi, Rodrigo
[1]
;
de Torres, Erica M.
[2]
;
Rodrigues, Renata C. S.
[1]
;
Conrad, Heather J.
[3]
;
de Mattos, Maria da Gloria C.
[1]
;
Fok, Alex S. L.
[4]
;
Ribeiro, Ricardo F.
[1]
Total Authors: 7
|
| Affiliation: | [1] Univ Sao Paulo, Sch Dent, Dept Dent Mat & Prosthodont, BR-14040904 Ribeirao Preto, SP - Brazil
[2] Univ Fed Goias, Sch Dent, Dept Prevent & Oral Rehabil, Goiania, Go - Brazil
[3] Univ Minnesota, Sch Dent, Dept Restorat Sci, Minneapolis, MN 55455 - USA
[4] Univ Minnesota, Sch Dent, Minnesota Dent Res Ctr Biomat & Biomech, Minneapolis, MN 55455 - USA
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | JOURNAL OF PROSTHETIC DENTISTRY; v. 112, n. 2, p. 276-284, AUG 2014. |
| Web of Science Citations: | 6 |
| Abstract | |
Statement of problem. Whether splinting or not splinting adjacent implants together can optimize the stress/strain transfer to the supporting structures remains controversial. Purpose. The purpose of this study was to compare the photoelasticity and digital image correlation (DIC) in analyzing the stresses/strains transferred by an implant-supported prosthesis. Material and methods. A polymethylmethacrylate model was made with a combination of acrylic resin replicas of a mandibular first premolar and second molar and threaded implants replacing the second premolar and first molar. Splinted (G1/G3) and nonsplinted (G2/G4) metal-ceramic screw-retained crowns were loaded with (G1/G2) and without (G3/G4) the presence of the second molar. Vertical static loads were applied to the first molar implant-supported crown (50 N-photoelasticity; 250 N-DIC). The resulting isochromatic fringes in the photoelastic models were photographed, and a single-camera 2-dimensional DIC system recorded the deformation at the surface of the resin models. Results. Residual stresses were present in the photoelastic model after screw fixation of the crowns. The following average photoelastic stress results (MPa) were found around the loaded implant: Cl (20.06), G2 (23.49), G3 (30.86), G4 (37.64). Horizontal strains (epsilon(xx), %) between the molars averaged over the length of the loaded implant were found by DIC: Cl (0.08 +/- 0.09), G2 (0.13 +/- 0.10), G3 (0.13 +/- 0.11), G4 (0.16 +/- 0.11). Splinted crowns transferred lower stresses to the supporting bone when the second molar was absent. The second molar optimized the stress distribution between the supporting structures even for nonsplinted restorations. Conclusions. Both methods presented similar results and seemed capable of indicating where issues associated with stress/strain concentrations might arise. However, DIC, while apparently less sensitive than photoelasticity, is not restricted to the use of light-polarizing materials. (AU) | |
| FAPESP's process: | 07/06995-3 - Photoelastic analysis of tension caused by multiple and single implant-supported crowns on posterior mandible areas. |
| Grantee: | Rodrigo Tiossi |
| Support Opportunities: | Scholarships in Brazil - Doctorate |