Effects of different types of temporary cements on the tensile strength and marginal adaptation of crowns on implants.
OBJECTIVE
The aim of this study was to evaluate the influence of four different types of temporary cements, Tempbond (Kerr), Tempbond NE (Kerr), Improv (Sterioss), and Dycal (Dentsply/Caulk), on the marginal adaptation and tensile strength of prosthetic specimens cemented on replicas of CeraOne abutments.


METHODS
Four test groups were formed: Group 1 (G-1), Tempbond (Kerr); Group 2 (G-2), Tempbond NE (Kerr); Group 3 (G-3), Improv (Sterioss); Group 4 (G-4), Dycal (Dentsply/Caulk). For the specimens, gold cylinders (DCB 160, Nobel Biocare) adapted to stainless steel replicas of CeraOne abutments (Nobel Biocare) were utilized. The replicas on a stainless steel base were made in a special machine for implant components. The cement thicknesses for each luting agent were measured using a Measurement Comparative Microscope (Mitutoyo). The readings obtained before cementation were used as the controls (G-0). Following each group's cementation, the specimens were submitted to tensile strength tests with a Universal Testing Machine (Kratus).


RESULTS
The results of the marginal adaptation test as reflected by cement thicknesses were: G-0 = 11.7 microm, G-1 = 35.7 microm (+/- 8.8), G-2 = 41.7 microm (+/- 9.0), G-3 = 32.6 microm (+/- 9.7) and G-4 = 38.2 microm (+/- 6.7). The tensile strength tests yielded the following values: G-1 = 58.5 N (+/- 14.8), G-2 = 51 N (+/- 8.2), G-3 = 61.8 N (+/- 17.1) and G-4 = 71.8 N (+/- 9.3).


CONCLUSIONS
The four temporary cements tested all provided similar marginal adaptation. G-4 (Dycal) showed a higher tensile strength than G-2 (Tempbond NE).
Akashia
Ana Eliza
AE
Universidade Paulista, UNIP/Bauru, São Paulo, Brazil. aeakashi@uol.com.br
Francischone
Carlos Eduardo
CE
Tokutsune
Edson
E
da Silva
Walter
W
D000704:Analysis of Variance; D002126:Calcium Hydroxide; D002484:Cementation; D003442:Crowns; D000044:Dental Abutments; D001840:Dental Bonding; D003738:Dental Cements; D018772:Dental Marginal Adaptation; D017268:Dental Prosthesis Retention; D019094:Dental Prosthesis, Implant-Supported; D003794:Dental Restoration, Temporary; D005054:Eugenol; D006047:Gold Alloys; D008422:Materials Testing; D008899:Mineral Oil; D008903:Minerals; D013193:Stainless Steel; D018709:Statistics, Nonparametric; D013718:Tensile Strength; D015034:Zinc Oxide
D003738:Dental Cements; D006047:Gold Alloys; C413303:ImProv; D008903:Minerals; C474196:Tempbond NE; D013193:Stainless Steel; D005054:Eugenol; C025702:Dycal; C076899:Temp-Bond; D008899:Mineral Oil; D002126:Calcium Hydroxide; D015034:Zinc Oxide