| Author(s): |
André Luís Faria e Silva
Total Authors: 1
|
| Document type: | Doctoral Thesis |
| Press: | Piracicaba, SP. , ilustrações. |
| Institution: | Universidade Estadual de Campinas (UNICAMP). Faculdade de Odontologia de Piracicaba |
| Defense date: | 2008-07-15 |
| Examining board members: |
Luís Roberto Marcondes Martins;
Carlos José Soares;
Cesar Augusto Galvão Arrais;
Flavio Henrique Baggio Aguiar;
Luis Alexandre Maffei Sartini Paulillo
|
| Advisor: | Luís Roberto Marcondes Martins |
| Field of knowledge: | Health Sciences - Dentistry |
| Indexed in: | Base Acervus-UNICAMP; Biblioteca Digital da UNICAMP |
| Location: | Universidade Estadual de Campinas. Biblioteca Central Cesar Lattes; T/UNICAMP; Si38e; Universidade Estadual de Campinas. Faculdade de Odontologia de Piracicaba. Biblioteca Prof. Dr. Carlos Henrique Robertson Liberalli; T/UNICAMP; Si38e |
| Abstract | |
During the cementation procedures of indirect restorations and intraradicular posts using resin cements, proper polymerization of the luting material is essential for the clinical success of restorations. However, the polymerization potential of chemically cured and light-cured components of commercially available dual-cured cements was found to vary greatly. In addition, the rapid increase in viscosity caused by light-activation may inhibit the chemically induced polymerization and reduce the ultimate degree of conversion (DC). Therefore, the aims of this study were to evaluate the effect of the light-activation (absence, immediate or delayed) of three dual-cured resin cement (Enforce, RelyX ARC and Panavia F) on: 1 ¿ kinetics and rate of polymerization (Rp); 2 ¿ diametral tensile strength (DTS) and relative rigidity (RR); 3 ¿ polymerization shrinkage stress (SS); 4 ¿ ultimate tensile strength (UTS) and 5 ¿ shear bond strength (BS). For latter, the testing times (10 minutes or 24 hours) were also evaluated. Light-activation improved the DC for all resin cements. Delayed light-activation improved the DC for Enforce, reduced it for RelyX ARC and Panavia F. However, this activation mode reduced the maximum Rp for all cements. Panavia F presented slower polymerization reaction and the lowest DC when used in the absence of lightactivation. The use of ED Primer with this cement increases the DC for all activation modes. The absence of light-activation reduced the DTS only in Panavia F. For delayed light-activation, RelyX ARC showed higher DTS than the other cements. For RR, there was no difference between the activation modes, but RelyX ARC presented higher values than Panavia F for immediate light-activation. The absence of light-activation generated the lowest SS and the immediate lightactivation led to the highest values. For the cements, RelyX ARC showed higher SS than Panavia F. The activation mode had no effect on UTS. The lowest UTS values were found for Panavia F. RelyX ARC presented the highest BS values and Panavia F the lowest. Light-activation of the cements improved the BS, independently of the time that this was done. The specimens tested at 24 hours presented higher values than those evaluated at 10 minutes (AU) | |
| FAPESP's process: | 07/01006-1 - Effect of activation mode of dual-cured resin cements on polymerization kinetics, mechanical properties, bond strength and stress generation |
| Grantee: | André Luís Faria e Silva |
| Support Opportunities: | Scholarships in Brazil - Doctorate |