Evaluation of Rheological and Textural Properties
of Toothpastes
Mahmut Ozan TOKSOY*,°, Fatmanur TUGCU-DEMÝRÖZ*, Figen TIRNAKSIZ*
* Gazi University, Faculty of Pharmacy, Department of Pharmaceutical Technology, Yenimahalle, Ankara, TURKEY
° Corresponding Author:
Phone: +90 (312) 202 30 58
Fax: +90(312) 212 79 58
E-mail: mahmutozantoksoy@gmail.com
SUMMARY
The aim of the study was to determine whether the rheological
properties and texture analysis parameters of toothpastes can be
evaluated together. For this purpose, ten children’s toothpastes were
evaluated using a rotational viscometer and texture analyzer. For
each toothpaste, the shear data determined using the viscometer
were plotted against shear stress data, while the shear data were
plotted on a graph against viscosity data. Flow behavior index was
calculated using the Ostwald de Waele equation. Following this, a
texture analyzer was used to evaluate and determine each toothpastes
consistency, spreadability, firmness, cohesiveness. This study showed
that all of the evaluated toothpastes exhibited shear thinning. We
concluded that consistency factor and the texture analyzer parameters
need to be evaluated separately.
Key Words:Toothpastes, texture analysis, viscometer, flow behavior
index, shear thinning.
