EFFECT OF PREPARATION TIME ON CEMENTEDCAST POST-COR
Abstract
Introduction. The effect of reformatory reduction on seal and retention of the cemented post with zinc phosphate cement considered in four different times.
Methods. After tooth preparing, supply of molding post and cement, the reformatory reduction performed on samples except control group. The starting times are as follows: 1. Immediately after cementing; 2. Six minutes after cementing; 3. One hour after cementing; And 4. 24 hour after cementing. Thensamples are kept in normal saline, in 37c,moisture 100%. In order to close test qualificauon to normal condition of mouth, after reduction completion, the samples go under the termocyclic operation. Then dye penetration, sample incision and amount of leakage, considered by reflective microscope.
Results. The dye penetration"s average in different groups has has meaningful difference. The group which has no meaningful difference with control group, is that on which reformatory reduction has performed 24 hour after post core cementing. The others have meaningful difference with control group. There is no meaningful difference between two consecutive groups on which reformatory reduction performed in different times.
Discussion. We recommend cememted post-core after final setting of cement
Methods. After tooth preparing, supply of molding post and cement, the reformatory reduction performed on samples except control group. The starting times are as follows: 1. Immediately after cementing; 2. Six minutes after cementing; 3. One hour after cementing; And 4. 24 hour after cementing. Thensamples are kept in normal saline, in 37c,moisture 100%. In order to close test qualificauon to normal condition of mouth, after reduction completion, the samples go under the termocyclic operation. Then dye penetration, sample incision and amount of leakage, considered by reflective microscope.
Results. The dye penetration"s average in different groups has has meaningful difference. The group which has no meaningful difference with control group, is that on which reformatory reduction has performed 24 hour after post core cementing. The others have meaningful difference with control group. There is no meaningful difference between two consecutive groups on which reformatory reduction performed in different times.
Discussion. We recommend cememted post-core after final setting of cement
Keywords
Preparation, Seal, Post-Core