Evaluation of total metallic crowns retention cemented with different provisional cements

Abstract

The objective of this study was to evaluate the tensile strength of total metallic crowns cemented with different provisional cements. Therefore, thirty upper human molars were selected. The samples were prepared to receive total metal crown and were randomly divided into three groups of 10 specimens each. The crowns of Group 1 were cemented with calcium-hydroxide (Dycal™), Group 2 received zinc oxide-eugenol (Temp-Bond™) and Group 3 cemented with zinc oxideeugenol (Lysanda past™). 24h after cementation, the samples were submitted to traction in the universal test machine. When the testes were finished all crowns and teeth were properly cleaned, shared and recemented and then taken to traction test 21 days after cementation. The results were evaluated from 1-way analysis of variance and the Student-Newman-Keuls comparison test was conducted in order to compare the mean retention resistance of groups. The statistical analysis showed significant difference among the groups submitted to retention test 1 day and 21 days after cementation. The tensile strength after 24h was stronger to Group 1 (21.92 Kgf), following by Group 2 (12.95 Kgf) and 3 (3.64 Kgf), respectively. After 21 days, the results showed for Group 1 (1.52 Kgf) and 2 (1.40 Kgf) were lower than before, while Group 3 (3.76 Kgf) was similar, there were no significant differences among the groups. It has been concluded that, by observing the results, the time factor may be decisive when reducing tensile strength of different provisional cements.