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Abstract
Purpose
The purpose of this study was to compare the cleansing performance of a distilled water, a diluted solution of sodium hypochlorite as a household bleaching cleanser and three alkaline peroxide cleansers in vivo plaque deposits by using scanning electron microscope.
Materials and methods
Five individuals were selected from department of the prosthodontics in Pusan National University Hospital, and each of them was inserted with specimens for plaque accumulation in their temporary dentures for 48 hours. The specimens were removed and cleaned by each cleansing agents for 8 hours. Scanning electron micrographs were made from the specimens at a magnification of ×2,000. A panel of ten persons with a dental or paradental background, but not directly involved in the study, was selected to analyze the photomicrographs to determine which denture cleanser was more effective in removing plaque.
Results
Diluted solution of sodium hypochlorite was the most effective at removing plaque following Polident®, Cleadent®e, Bonyplus® and distilled water in order. But there was no significant difference of cleansing efficacy between diluted solution of sodium hypochlorite and Polident®, Polident® and Cleadent®e, Cleadent®e and Bonyplus®, respectively (P > .05). Alkaline peroxide cleansers by themselves cannot adequately remove accumulated plaque deposits, especially if the deposits are heavy. Corrosion could be seen on the surface of non-precious alloy specimens immersed in diluted solution of sodium hypochlorite.
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Fig. 2.
Micrographs at original magnifications of ×2,000 of the five plaque specimens from a temporary denture interpreted as a thin layer of plaque accumulation : A, immersion in distilled water only; B, immersion in the diluted solution of sodium hypochlorite (arrows indicate corrosion); C, immersion in the Polident®; D, immersion in the Cleadent®e; E, immersion in the Bonyplus®.
Fig. 3.
Micrographs at original magnifications of ×2,000 of the five plaque specimens from a temporary denture interpreted as a medium-thickness layer of plaque accumulation : A, immersion in distilled water only; B, immersion in the diluted solution of sodium hypochlorite (arrows indicate corrosion); C, immersion in the Polident®; D, immersion in the Cleadent®e; E, immersion in the Bonyplus®.
Fig. 4.
Micrographs at original magnifications of ×2,000 of the five plaque specimens from a temporary denture interpreted as a thick layer of plaque accumulation : A, immersion in distilled water only; B, immersion in the diluted solution of sodium hypochlorite (arrows indicate corrosion); C, immersion in the Polident®; D, immersion in the Cleadent®e; E, immersion in the Bonyplus®.
Table 1.
Materials used in study
Table 2.
Mean ± SD and median of ranks
| Treatment | N | Mean ± SD | Median |
|---|---|---|---|
| Distilled Water (Control) | 8 | 4.16 ± 1.00 | 4.65 |
| NaOCl (more than 0.08%) | 8 | 1.66 ± 0.41 | 1.70 |
| Polident® | 8 | 2.21 ± 0.65 | 1.95 |
| Cleadent®e | 8 | 2.94 ± 0.70 | 2.95 |
| Bonyplus® | 8 | 3.89 ± 0.60 | 3.90 |
| Asymp. Sig.∗ | 0.0001 |
Table 3.
Wilcoxon Rank Sum test
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