Assessment of flexural strength and color alteration of heat-polymerized acrylic resins after simulated use of denture cleansers

Abstract

The purpose of this study was to assess flexural strength and color alteration of acrylic resins immersed in denture cleansers for different periods of time. Rectangular specimens (65 x 10 x 3mm) made from three heat-polymerized acrylic resins (Lucitone 550, QC-20 and Triplex) were assigned to three denture cleansers groups (Bony Plus, Corega Tabs and Efferdent Plus) and a control group (immersion in water). Soaking trials of 15 min and 8 h simulated 30 days of use. Flexural strength testing was carried out with 105 specimens on a universal testing machine. Color alterations were visually assessed by examination of photographs taken from 21 specimens. Flexural strength means (in MPa) were analyzed statistically by analysis of variance and Tukey's test at 5% significance level. There were significant differences (p<0.01) among the resins Lucitone (89.439 +/- 7.962), Triplex (88.024 +/- 5.167) and QC-20 (83.379 +/- 7.153). No significant differences (p>0.05) were found either among the denture cleansers (Bony Plus = 87.693 +/- 6.943; Corega Tabs = 86.955 +/- 7.114; Efferdent Plus = 86.195 +/- 7.865 and control = 86.536 +/- 7.012) or between the soaking periods (15 min = 86.875 +/- 7.625 and 8 h = 87.432 +/- 7.355) throughout the soaking cycles simulating 30 days of use. No color alterations were identified by visual examination. The findings of this study showed that chemical denture cleansers used according to the manufacturers' specifications did not cause flexural strength alterations or color changes in heat-polymerized acrylic resins submitted to soaking cycles that simulated 30 days of use.

Antifungal Activity of Apple Cider Vinegar on Candida Species Involved in Denture Stomatitis

“…Color is an important physical property in the esthetic evaluation of acrylic resins used as bases for removable dentures. The original color of a resin can be changed if diet includes large amounts of colorants or absorption of liquids, or if dentures are immersed in disinfectant solutions, impairing their esthetics . In this study, there was no change in acrylic resin color after a 180‐minute exposure period to apple cider vinegar and nystatin, consistent with other findings …”

Antifungal Activity of Apple Cider Vinegar on Candida Species Involved in Denture Stomatitis

“…Color is an important physical property in the esthetic evaluation of acrylic resins used as bases for removable dentures. The original color of a resin can be changed if diet includes large amounts of colorants or absorption of liquids, or if dentures are immersed in disinfectant solutions, impairing their esthetics . In this study, there was no change in acrylic resin color after a 180‐minute exposure period to apple cider vinegar and nystatin, consistent with other findings …”

The Effect of Denture Cleansers on Color Stability, Water Sorption and Solubility of Stained Denture Base Materials

“…Except for specimens immersed in oxalic acid which show a significant difference. These results are in agreement with Sato et al [13] , Al-khafaji [9], [11] , and Kortrakulkij [14]. The oxalic acid has a greater effect on the color of acrylic resin specimens; this may be due to that the oxalic acid absorbs at the same wavelength (500 nm), or it may react with our material (QC-20) and give a product which absorbs at the same wavelength and increasing the color intensity.…”

Effect of plant extract denture cleansing on heat-cured acrylic denture base resin: An in vitro study

“…In the present study, results obtained in combination method (88.037 ± 14.3) were in agreement with Sato et al . [ 11 ] where chemical method was used for denture cleansing 15 min/day for 30 days and concluded that there was no significant change in flexural strength which was found to be 86.75 ± 7.625 MPa and also was in agreement with Raj and D’Souza[ 1 ] where there is no change in the flexural strength when denture was continuously immersed in cleanser for 4 months and also with Paranhos Hde et al . [ 12 ] who concluded that overnight immersion in a denture cleansing solution simulating a year half of use did not alter the flexural strength which was 97.61 ± 11.09 MPa, since flexural strength depends on bulk of material, and insignificant change in flexural strength indicates that the bulk of the material remained intact from the influence of cleansers.…”

Antifungal Activity of Apple Cider Vinegar on Candida Species Involved in Denture Stomatitis

“…Color is an important physical property in the esthetic evaluation of acrylic resins used as bases for removable dentures. The original color of a resin can be changed if diet includes large amounts of colorants or absorption of liquids, or if dentures are immersed in disinfectant solutions, impairing their esthetics . In this study, there was no change in acrylic resin color after a 180‐minute exposure period to apple cider vinegar and nystatin, consistent with other findings …”

The Effect of Denture Cleansers on Color Stability, Water Sorption and Solubility of Stained Denture Base Materials

“…Except for specimens immersed in oxalic acid which show a significant difference. These results are in agreement with Sato et al [13] , Al-khafaji [9], [11] , and Kortrakulkij [14]. The oxalic acid has a greater effect on the color of acrylic resin specimens; this may be due to that the oxalic acid absorbs at the same wavelength (500 nm), or it may react with our material (QC-20) and give a product which absorbs at the same wavelength and increasing the color intensity.…”

Effect of plant extract denture cleansing on heat-cured acrylic denture base resin: An in vitro study

“…In the present study, results obtained in combination method (88.037 ± 14.3) were in agreement with Sato et al . [ 11 ] where chemical method was used for denture cleansing 15 min/day for 30 days and concluded that there was no significant change in flexural strength which was found to be 86.75 ± 7.625 MPa and also was in agreement with Raj and D’Souza[ 1 ] where there is no change in the flexural strength when denture was continuously immersed in cleanser for 4 months and also with Paranhos Hde et al . [ 12 ] who concluded that overnight immersion in a denture cleansing solution simulating a year half of use did not alter the flexural strength which was 97.61 ± 11.09 MPa, since flexural strength depends on bulk of material, and insignificant change in flexural strength indicates that the bulk of the material remained intact from the influence of cleansers.…”

Antifungal Activity of Apple Cider Vinegar on Candida Species Involved in Denture Stomatitis

“…Color is an important physical property in the esthetic evaluation of acrylic resins used as bases for removable dentures. The original color of a resin can be changed if diet includes large amounts of colorants or absorption of liquids, or if dentures are immersed in disinfectant solutions, impairing their esthetics . In this study, there was no change in acrylic resin color after a 180‐minute exposure period to apple cider vinegar and nystatin, consistent with other findings …”

The Effect of Denture Cleansers on Color Stability, Water Sorption and Solubility of Stained Denture Base Materials

“…Except for specimens immersed in oxalic acid which show a significant difference. These results are in agreement with Sato et al [13] , Al-khafaji [9], [11] , and Kortrakulkij [14]. The oxalic acid has a greater effect on the color of acrylic resin specimens; this may be due to that the oxalic acid absorbs at the same wavelength (500 nm), or it may react with our material (QC-20) and give a product which absorbs at the same wavelength and increasing the color intensity.…”

Effect of plant extract denture cleansing on heat-cured acrylic denture base resin: An in vitro study

“…In the present study, results obtained in combination method (88.037 ± 14.3) were in agreement with Sato et al . [ 11 ] where chemical method was used for denture cleansing 15 min/day for 30 days and concluded that there was no significant change in flexural strength which was found to be 86.75 ± 7.625 MPa and also was in agreement with Raj and D’Souza[ 1 ] where there is no change in the flexural strength when denture was continuously immersed in cleanser for 4 months and also with Paranhos Hde et al . [ 12 ] who concluded that overnight immersion in a denture cleansing solution simulating a year half of use did not alter the flexural strength which was 97.61 ± 11.09 MPa, since flexural strength depends on bulk of material, and insignificant change in flexural strength indicates that the bulk of the material remained intact from the influence of cleansers.…”