Annotation
Solubility of Root Canal Cements LouIs I. GROSSMAN
Endodontic Department, School of Dental Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA J Dent Res 57(9-10):927, September-October 1978
The solubility of commercial root canal cements available in this country has not been investigated. With the exception of N2, root canal cements were purchased on the open market and were mixed according to the manufacturers' directions when they were enclosed with the package. The cements were placed in stainless steel cylinders measuring 1 cm in length and having an internal diameter of 6 mm. The tubes were cleaned with alcohol followed by chloroform to eliminate foreign substances on the surface. They were identified by code number, and placed vertically on a polished glass plate, then filled with cement until level with the upper surface of the cylinder. Some cements which do not flow readily were spatulated into the tubes. The tubes were left standing at room temperature for one week to allow sufficient time for the cements to harden. The tubes were then placed overnight in an incubator at 37 C to make certain the cements had completely set and were devoid of moisture. The next day the tubes were weighed to the 5th decimal place on a Mettler S5 balance. They were then immersed for one week in a solution composed of 98 parts of deionized water and 2 parts nutrient broth. The broth was added to the water to approximate Received for publication February 17, 1978. Accepted for publication March 17, 1978.
the viscosity of periapical exudate. The waterbroth solution was changed daily. At the end of the week, the tubes were washed by dripping deionized water over them for 1 hour, then put to dry on filter paper for 1 hour without the cement touching the paper. The tubes were placed in a desiccator containing Drierite desiccant to eliminate surface moisture. The desiccator was placed in an incubator at 37 C overnight, and the next day the tubes were re-weighed on the same Mettler balance. The loss in weight was considered an indication of the solubility of the cement. The data in the Table represent an average of 5 tests for each cement. It is obvious that the two plastic cements, AH 26 and Diaket, showed the least solubility while the ZOE type cements demonstrated varying degrees of solubility. TABLE SOLUBILrrY-AVERAGE Loss
AH 26 Diaket Tubli-seal Procosol Kerr Roth 801 Roth 811
Mynol ZnO Eugenol N2
0.00028 gin 0.00300 gin 0.00582 gin 0.00745 gm 0.01147 gm 0.01175 gm 0.01205 gm 0.01415 gm 0.01648 gm 0.01690 gm
927 Downloaded from jdr.sagepub.com at The University of Iowa Libraries on May 31, 2015 For personal use only. No other uses without permission.
Solubility of Root Canal Cements LouIs I. GROSSMAN
Endodontic Department, School of Dental Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA J Dent Res 57(9-10):927, September-October 1978
The solubility of commercial root canal cements available in this country has not been investigated. With the exception of N2, root canal cements were purchased on the open market and were mixed according to the manufacturers' directions when they were enclosed with the package. The cements were placed in stainless steel cylinders measuring 1 cm in length and having an internal diameter of 6 mm. The tubes were cleaned with alcohol followed by chloroform to eliminate foreign substances on the surface. They were identified by code number, and placed vertically on a polished glass plate, then filled with cement until level with the upper surface of the cylinder. Some cements which do not flow readily were spatulated into the tubes. The tubes were left standing at room temperature for one week to allow sufficient time for the cements to harden. The tubes were then placed overnight in an incubator at 37 C to make certain the cements had completely set and were devoid of moisture. The next day the tubes were weighed to the 5th decimal place on a Mettler S5 balance. They were then immersed for one week in a solution composed of 98 parts of deionized water and 2 parts nutrient broth. The broth was added to the water to approximate Received for publication February 17, 1978. Accepted for publication March 17, 1978.
the viscosity of periapical exudate. The waterbroth solution was changed daily. At the end of the week, the tubes were washed by dripping deionized water over them for 1 hour, then put to dry on filter paper for 1 hour without the cement touching the paper. The tubes were placed in a desiccator containing Drierite desiccant to eliminate surface moisture. The desiccator was placed in an incubator at 37 C overnight, and the next day the tubes were re-weighed on the same Mettler balance. The loss in weight was considered an indication of the solubility of the cement. The data in the Table represent an average of 5 tests for each cement. It is obvious that the two plastic cements, AH 26 and Diaket, showed the least solubility while the ZOE type cements demonstrated varying degrees of solubility. TABLE SOLUBILrrY-AVERAGE Loss
AH 26 Diaket Tubli-seal Procosol Kerr Roth 801 Roth 811
Mynol ZnO Eugenol N2
0.00028 gin 0.00300 gin 0.00582 gin 0.00745 gm 0.01147 gm 0.01175 gm 0.01205 gm 0.01415 gm 0.01648 gm 0.01690 gm
927 Downloaded from jdr.sagepub.com at The University of Iowa Libraries on May 31, 2015 For personal use only. No other uses without permission.
