A comparative evaluation of effect of denture cleansers on color stability, surface roughness and hardness of polyamide denture base material.

CONTEXT: Different denture cleansers have an effect on color and different surface properties of polyamide denture base material. Thus, selecting a denture cleanser solution for polyamide denture base materials should be based on the properties of the denture cleanser itself. The present in vitro study is aimed to evaluate and compare the effect of different denture base cleansers on color, surface roughness and hardness of polyamide denture base material. METHODS AND MATERIAL: Thirty specimens of commercially available polyamide denture base material were fabricated and divided into three groups of 10 each. Specimens from each group were immersed in different denture cleansers (sodium perborate, thyme oil and ozonated water) for 10 mins per day for 180 days. Initial and final color, surface roughness and surface hardness of each specimen were measured and the difference was calculated. Data was tabulated and subjected to statistical analysis using One way ANOVA for pair wise comparison. RESULTS: Polyamide denture base resin exhibited some degree of change in color, surface roughness, and surface hardness in all denture cleansers but was not statistically significant. CONCLUSIONS: The choice of denture cleanser for different denture base resins should be based on the chemistry of resin and the cleanser, denture cleanser concentration and duration of immersion.

Comparative evaluation of adjunctive antibiotics given post periodontal flap surgery.

BACKGROUND: Antibiotics are known to improve clinical parameters in patients with periodontitis, so they should be capable of enhancing the surgical treatment outcome by improving clinical parameters when given adjunctively following periodontal flap surgery. METHODS: Thirty subjects with moderate to severe periodontitis were randomly divided into three groups: Group I: 10 patients without antibiotic prescription after flap surgery, Group II: 10 patients prescribed with metronidazole 400 mg t.i.d. for 14 days, and Group III: 10 patients prescribed with doxycycline 200 mg o.d. as booster dose followed by successive doses of 100 mg o.d. for 21 days. Plaque index (PI), gingival index (GI), pocket probing depth (PPD), and clinical attachment level (CAL) were recorded at baseline, 2 weeks, and 2 months. The mean values and standard deviation values for each parameter were calculated using analysis of variance. Group comparison was done using paired t-and unpaired t-tests. RESULTS: Reduction in PI, GI, PPD, and CAL after 2 weeks and 3 months from baseline in all the three groups was seen; intergroup comparison showed more reduction in PPD and GI and more gain in CAL in Groups II and III after 3 months when compared with Group I. No statistical difference was seen between Groups II and III. CONCLUSION: Within the limits of this study, it can be concluded that antibiotic administration as an adjunct to conventional flap surgery helps in improving clinical parameters.

Effect of denture cleansers on color stability, surface roughness, and hardness of different denture base resins.

AIM: The purpose of this study was to evaluate the effect of different denture cleansers on the color stability, surface hardness, and roughness of different denture base resins. MATERIALS AND METHODS: Three denture base resin materials (conventional heat cure resin, high impact resin, and polyamide denture base resin) were immersed for 180 days in commercially available two denture cleansers (sodium perborate and sodium hypochlorite). Color, surface roughness, and hardness were measured for each sample before and after immersion procedure. STATISTICAL ANALYSIS: One-way analysis of variance and Tukey's post hoc honestly significant difference test were used to evaluate color, surface roughness, and hardness data before and after immersion in denture cleanser (α =0.05). RESULTS: All denture base resins tested exhibited a change in color, surface roughness, and hardness to some degree in both denture cleansers. Polyamides resin immersed in sodium perborate showed a maximum change in color after immersion for 180 days. Conventional heat cure resin immersed in sodium hypochlorite showed a maximum change in surface roughness and conventional heat cure immersed in sodium perborate showed a maximum change in hardness. CONCLUSION: Color changes of all denture base resins were within the clinically accepted range for color difference. Surface roughness change of conventional heat cure resin was not within the clinically accepted range of surface roughness. The choice of denture cleanser for different denture base resins should be based on the chemistry of resin and cleanser, denture cleanser concentration, and duration of immersion.