Evaluation of denture adhesive cream properties depending on the contact area between denture base and oral mucosa

BACKGROUND: The relevance of this study is that in many countries around the world, and in Russia in particular, the increasing trend toward an aging of population makes problems in dentistry urgent, among which the significant increase in the use of removable dentures is important. The probability of the complete or partial loss of their own teeth is increasing, therefore, the number of removable dentures and the problem of stabilization, adaptation and fixation arises. Factors such as the stabilization and fixation of removable dentures depend on certain anatomical conditions of the denture bed, but due to the lack of optimal conditions, especially in patients with a complete lack of teeth, the latter have to resort to additional means (adhesives) that are used to improve the fixation of removable dentures.

AIM: The purpose of this study was to evaluate the adhesive properties of the preparation for fixation during prosthetics with removable structures, depending on the area of the base adjacent to the prosthetic bed.

MATERIAL AND METHODS: Was used a device consisted of a laboratory tripod, a coil, a metal cylinder and a plastic disc are presented in the aricle. However, the bottom of a cylinder is lined with bioskin that simulates oral mucosa’ tissues. A dynamometer with an option to measure maximum results was used to measure the adhesion force. The adhesive properties of adhesive cream, containing carboxymethyl cellulose and Poly (methyl vinyl ether-alt-maleic acid) were evaluated in 3 stages. Adhesion was examined on a dry surface, on a surface moistened with distilled water, and on a surface moistened with artificial saliva. First, the adhesion value was determined immediately after application of the fixation cream and then after 2 minutes of exposure to the adhesive cream.

RESULTS: It was found that the contact area of the denture base and oral mucosa equal 55,6%, is the limit percentage of the nonconformity, that can be compensated by using Corega adhesive cream (GSK, UK) only with sufficient moisture content of the oral mucosa and a two-minute exposure of the denture adhesive.

CONCLUSIONS: The adhesion strength of the means for fixing removable prostheses increases after wetting the studied surfaces. It is established that the symmetry of non-congruent sections on the basis of the prosthesis can increase the adhesive stability of the entire removable structure.