Trial of an Experimental Castor Oil Solution for Cleaning Dentures

Abstract

Denture hygiene is essential because denture biofilm is involved in oral infections and systemic diseases. Although there are chemical agents available on the market, none of them have ideal properties and research on such products is still necessary. The aim of this study was to evaluate the efficacy of a castor bean (Ricinus communis)-based solution for removing denture biofilm, compared to two traditional products (sodium hypochlorite and alkaline peroxide). Fifty maxillary complete denture wearers were instructed to brush their dentures after meals and to immerse their dentures once a day in the following solutions: Saline (20 min; control), Polident alkaline peroxide (3 min), NaOCl (20 min) and 2% castor oil solution (20 min). Participants used each solution for a period of 7 consecutive days, according to a random sequence. After each period, the internal surfaces of maxillary complete dentures were stained with a disclosing solution (1% neutral red), photographed and the disclosed biofilm was quantified with the aid of specific software. The influence of treatments on results was verified by the Friedman test (α=0.05). Tested solutions presented significant difference (Fr=51.67; p<0.001). Saline and NaOCl were significantly different (median: 2.0% and 0.0%) whereas Polident and castor oil presented intermediate results (median: 1.0% and 1.5%, respectively). It can be concluded that the castor oil solution tested in this study was comparable to alkaline peroxide in terms of efficiency in denture biofilm removal.

Effects of Denture Cleansers on Heat-Polymerized Acrylic Resin: A Five-Year-Simulated Period of Use

“…A 20-minute immersion was employed for all solutions (3,6,16). So, one hour represented 3 immersions of 20 min and each 24 h (one day) corresponded to 72 immersions of 20 min per day.…”

“…The alkaline hypochlorites present bactericidal and fungicidal action, as well as stain removal properties and have been suggested as effective denture cleansers (4)(5)(6). Alkaline peroxides are composed by oxidant, effervescent, surface tension reducers and chelating agents commonly found in tablet or powder forms, which in contact with water become hydrogen peroxide solutions (1).…”

Adverse Effects on PMMA Caused by Mechanical and Combined Methods of Denture Cleansing

“…The main chemical method of denture cleansing consists in immersing the prosthetic devices in solutions with solvent, detergent, antibacterial and antifungal actions (3). Among the proposed solutions, sodium hypochlorite is widely indicated due to its antimicrobial characteristics and has been suggested as an effective denture cleanser (4)(5)(6).…”

Effect of Denture Cleansers on Flexural Strength, Color Stability and Surface Roughness of Flexible and Microwave cured Acrylic Resin

“…The literature has shown that sodium hypochlorite and alkaline peroxides are the two main classes of immersion denture cleansers 27 . Sodium hypochlorite is inexpensive, presents bactericidal and fungicidal action, as well as stain removal properties, requires a short period of disinfection, and have been suggested as effective denture cleansers [28][29][30] . Moreover, alkaline hypochlorite cleansers contain 5% sodium hypochlorite act directly on organic matrix of plaque causing dissolution of polymer structure.…”

“…Corega Tabs, for example, is indicated to be immersed from 5 min until 8 h. In order to standardize the immersions, allowing comparison of the results, all solutions were immersed for 20 min 30,33 .The effect of denture cleansers on acrylic resin properties after long periods of immersion has not been widely studied. The hygiene procedures s used for a long time because the durability of a denture is about 5 to 7 years 2 .…”