Power brushing and chemical denture cleansers induced color changes of pre-polymerized CAD/CAM denture acrylic resins

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 (65x10x3mm) 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.

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Perubahan warna lempeng resin akrilik yang direndam dalam larutan desinfektan sodium hipoklorit dan klorhexidin (The color changes of acrylic resins denture base material which are immersed in Sodium hypochlorite and chlorhexidine)

Dental Journal (Majalah Kedokteran Gigi) ◽

10.20473/j.djmkg.v38.i1.p36-40 ◽

2006 ◽

Vol 38 (1) ◽

pp. 36

Author(s):

David David ◽

Elly Munadziroh

Keyword(s):

Sodium Hypochlorite ◽

Base Material ◽

Denture Base ◽

Color Changes ◽

Acrylic Resins

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Comparative study of the comfort in patients rehabilitated with three types of partial dentures

Acta Stomatologica Marisiensis Journal ◽

10.2478/asmj-2019-0010 ◽

2019 ◽

Vol 2 (2) ◽

pp. 223-228

Author(s):

Farah Bechir ◽

Ilinca Suciu

Keyword(s):

Oral Cavity ◽

Silicone Rubber ◽

Dental Materials ◽

Biological Tissues ◽

Flexible Polymers ◽

Color Changes ◽

The Third ◽

Acrylic Resins ◽

Comfort Levels ◽

Dental Technician

AbstractIntroduction: At present, the researchers are targeted to improve and increase the biocompatibility of dental materials that are in direct contact with biological tissues. The biocompatibility of the dental materials that contact the tissues of the oral cavity present relevance for the patient, clinician, dental technician, and manufacturer.Aim of the study: The aim of this study was represented by the comparative research regarding the comfort of the patients wearing removable partial prostheses with clasps made of wire and flexible polymers.Material and Methods. Patients wearing partial dentures from Meliodent heat-cured acrylic resins with wipla wire clasps, flexible partial dentures made from Valplast and dentures with clasps of CuSil silicone rubber participated in this study. The research was performed on 3 groups, of 8 patients each, in which comfort levels (according to 5 criteria) were determined, after 6, 12, 18, respectively 24 months of the partial removable prostheses insertion in the oral cavity.Results. Presence of decubitus lesions of the oral mucosa in the clasps areas was noticed mostly in the Valplast polyamide dentures (37.5%), existence of color changes at the base of prostheses and of clasps area appeared in 37.5% of the third group (CuSil PAD) patients, no patient included in the study presented allergic reactions and at the third and fourth recall, only 1 patient of all groups complained of unpleasant taste in the oral cavity.Conclusion. The removable prosthetic restorations with clasps made of flexible polymers and CuSil gaskets of silicone rubber, although initially much more comfortable and therefore much better accepted by patients, after two years were no longer active, could not be activated and necessited technical restorations, compared to those made of wipla wire clasps, which were activated with pliers, or, in the case of fracture, were replaced by the technician in the dental laboratory.

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Variations in Flexural Strength of Heat-polymerized Acrylic Resin after the Usage of Denture Cleansers

The Journal of Contemporary Dental Practice ◽

10.5005/jp-journals-10024-1848 ◽

2016 ◽

Vol 17 (4) ◽

pp. 322-326 ◽

Cited By ~ 1

Author(s):

M Kalavathi ◽

Mallikarjuna Ragher ◽

G Vinayakumar ◽

Sanketsopan Patil ◽

Aishwarya Chatterjee ◽

...

Keyword(s):

Flexural Strength ◽

Testing Machine ◽

Peak Load ◽

Acrylic Resin ◽

Control Group ◽

Denture Base ◽

Acrylic Resins ◽

Significant Difference ◽

Base Resin ◽

Denture Cleansers

ABSTRACT Objective The objective of this study was to evaluate and compare changes in the flexural strength of heat-cured denture base resins when treated using denture cleansers. Study design A total of 40 specimens with dimension 65 mm length, 10 mm width, and 3 mm thickness were prepared as per ISO 1567 specification. A total of 10 specimens were immersed in distilled water to be used as control. Of the remaining 30 samples, 10 were treated with Clinsodent, 10 with VI-Clean, and 10 with Clanden denture cleansers. Specimens in each group were subjected to three-point flexural load in universal testing machine at a cross-head speed of 5 mm/min. The peak load (N) was recorded and flexural strength was calculated. The findings were analyzed using Kruskal–Wallis analysis of variance and Mann–Whitney test. Results Heat-cured denture base resin selected for this study showed significant difference in flexural strength after immersion in denture cleansers Clinsodent, VI-Clean, and Clanden solutions, when compared with the control group. Conclusion Findings of this study showed that denture cleansers altered the flexural strength of heat polymerized acrylic resins that endured soaking cycles which simulated 180 days of use. Hence, denture cleansers should be used with caution, once a day after brushing the dentures. It is advisable for patients to follow the manufacturer's instructions. How to cite this article Ragher M, Vinayakumar G, Patil S, Chatterjee A, Mallikarjuna DM, Dandekeri S, Swetha V, Pradeep MR. Variations in Flexural Strength of Heat-polymerized Acrylic Resin after the Usage of Denture Cleansers. J Contemp Dent Pract 2016;17(4):322-326.

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Non-Thermal O2 Plasma Efficacy on C. albicans and Its Effect on Denture Base Resin Color

Applied Sciences ◽

10.3390/app112110367 ◽

2021 ◽

Vol 11 (21) ◽

pp. 10367

Author(s):

Christina Maillet ◽

Serge Odof ◽

Mikaël Meuret ◽

Florian Le Bras ◽

Frédéric Velard ◽

...

Keyword(s):

Low Pressure ◽

Denture Base ◽

Denture Stomatitis ◽

Log Reduction ◽

Color Changes ◽

Colony Forming Units ◽

Base Resin ◽

Denture Cleansers ◽

Denture Base Resin ◽

O2 Plasma

Denture stomatitis is a disease involving C. albicans, which can affect elderly and immuno-compromised people. To avoid any recurrence of this pathology, it is necessary to treat patients regularly and disinfect dentures. However, the denture cleansers’ efficacy is not optimal and often leads to adverse color effects on the denture base resins. The aim of this study was to investigate the efficacy of a low-pressure non-thermal O2 plasma (NTP) treatment on C. albicans seeded on ProBase®Hot resin (Ivoclar Vivadent). The viability reduction of C. albicans was assessed by colony forming units (CFU) analysis and by scanning electron microscopy (SEM). The effect of repeated treatments on the resin color was evaluated by spectrophotometry. The resin samples were placed in a sealed bag in which O2 plasma was generated in low-pressure conditions. The results showed that a 120-min O2 NTP treatment led to a 6-log reduction of C. albicans viability (p < 0.05) and to yeasts’ major alterations observed by SEM. Furthermore, significant slight color changes of the resin (∆E00 = 1.33) were noted only after six plasma treatments (p < 0.05). However, the denture aesthetic was preserved, as the color changes were not perceptible and remained below the acceptability threshold (∆E00 < 4).

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Superficial Effects of Different Finishing and Polishing Systems on the Surface Roughness and Color Change of Resin-Based CAD/CAM Blocks

Odovtos - International Journal of Dental Sciences ◽

10.15517/ijds.2021.46679 ◽

2021 ◽

pp. 247-257

Author(s):

Numan Aydın ◽

Serpil Karaoğlanoğlu ◽

Elif Aybala Oktay ◽

Bilge Ersöz

Keyword(s):

Surface Roughness ◽

Color Change ◽

Lower Surface ◽

Ceramic Block ◽

Color Changes ◽

Surface Polishing ◽

Cad Cam ◽

Ceramic Blocks ◽

One Step ◽

Hybrid Ceramic

Objective: CAD/CAM blocks are widely used in dental restorations around the world. This study aimed to investigate the effects of different polishing and finishing systems on surface roughness and color change of resin-based CAD/CAM blocks. Material and Methods: In this study, material samples of 2×7×12mm were prepared. In three different experimental groups, surface polishing was carried out with one-step, two-step and multi-step polishing systems. The samples in one subgroup of each experimental group were polished with the diamond paste. Once the initial roughness and color values of the samples were measured using a profilometer and a spectrophotometer, the samples were immersed in coffee. Surface roughness and color change (∆E00) results were statistically analyzed using two-way variance analysis (ANOVA). Results: Finishing and polishing systems created significantly different levels of surface roughness on the hybrid ceramic block (Vita Enamic) but not on the composites block (Brilliant Crios, Grandio Blocs). While the two-step and multi-step finishing and polishing systems produced the lowest color change on hybrid ceramic blocks, one-step and two-step systems achieved this on composite blocks (p<0.05). In all test groups, the supplementary polishing performed after regular polishing procedures helped us reduce the surface roughness and color change on CAD/CAM blocks. Conclusions: The findings obtained in this study suggest that one and two-step polishing systems are more suitable for resin-based composite CAD/CAM blocks; for hybrid ceramic CAD/CAM blocks, on the other hand, two and multi-step finishing and polishing systems seem to be more efficient concerning lower surface roughness and resistance to color changes.

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Discoloration and force degradation of orthodontic elastomeric ligatures

Dental Press Journal of Orthodontics ◽

10.1590/2177-6709.22.2.045-054.oar ◽

2017 ◽

Vol 22 (2) ◽

pp. 45-54 ◽

Cited By ~ 3

Author(s):

Samaneh Nakhaei ◽

Raha Habib Agahi ◽

Amin Aminian ◽

Masoud Rezaeizadeh

Keyword(s):

Testing Machine ◽

Color Stability ◽

Opinion Poll ◽

Color Changes ◽

Force Decay ◽

Average Residual ◽

Cad Cam ◽

Residual Force ◽

Initial Color

ABSTRACT OBJECTIVE: The aim of the present study was to evaluate color changes and force degradation of orthodontic elastomeric ligatures in different stretching patterns during a 8-weeks period. METHODS: Two elastomers with the minimum and two with the maximum color changing, and gray elastomers of two brands (American Orthodontics and Ortho Technology) were selected according to an opinion poll with clinicians and color changes after 4 weeks of intraoral use were evaluated. These elastomers were mounted on special jigs fabricated using a CAD-CAM technique, underwent different stretching patterns and the force was measured in 0, 24 hours, 2, 4 and 8 weeks. During in vivo part of the study, force levels of elastomers were measured after 4 weeks on a material testing machine. Data were analyzed with four-way ANOVA and Tukey post hoc tests. RESULTS: All the elastomers showed color changing but the degree of color stability was significantly different. The mean force degradation was higher in 1-mm stretch groups. After 8 weeks, the average residual force of elastomers was 1.45 ± 0.18 N and the maximum force decay was seen in the elastomers that exhibited the maximum initial force. CONCLUSION: There is significant relationship between the stretching pattern and the amount of residual force of elastomers. Elastomers with higher initial forces exhibited higher percentages of force loss after 8 weeks. It seems that there is a relationship between initial color and color changing of elastomers.

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Investigating the color changes on resin‐based CAD/CAM Blocks

Journal of Esthetic and Restorative Dentistry ◽

10.1111/jerd.12561 ◽

2019 ◽

Vol 32 (2) ◽

pp. 251-256 ◽

Cited By ~ 5

Author(s):

Numan Aydın ◽

Serpil Karaoğlanoğlu ◽

Elif A. Oktay ◽

Mehmet A. Kılıçarslan

Keyword(s):

Color Changes ◽

Cad Cam

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Flexural strength of denture base acrylic resins processed by conventional and CAD-CAM methods

Journal of Prosthetic Dentistry ◽

10.1016/j.prosdent.2019.03.010 ◽

2020 ◽

Vol 123 (4) ◽

pp. 641-646 ◽

Cited By ~ 4

Author(s):

Brian C. Aguirre ◽

Jenn-Hwan Chen ◽

Elias D. Kontogiorgos ◽

David F. Murchison ◽

William W. Nagy

Keyword(s):

Flexural Strength ◽

Denture Base ◽

Acrylic Resins ◽

Cad Cam

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Effects of Khat on Surface Roughness and Color of Feldspathic and Zirconia Porcelain Materials under Simulated Oral Cavity Conditions

Medicina ◽

10.3390/medicina56050234 ◽

2020 ◽

Vol 56 (5) ◽

pp. 234

Author(s):

Mohammed M. Al Moaleem ◽

Rashad AlSanosy ◽

Nasser M. Al Ahmari ◽

Mansoor Shariff ◽

Abdulkhaliq A. Alshadidi ◽

...

Keyword(s):

Surface Roughness ◽

Computer Aided Design ◽

Color Stability ◽

Computer Assisted ◽

Khat Chewing ◽

Color Changes ◽

Before And After ◽

Cad Cam ◽

Natural Teeth ◽

Aided Design

Background and Objectives: Khat chewing is considered as a daily habit that is practiced by more than five million people globally. The effect of khat chewing on the surface roughness and the color stability of natural teeth and the material used in the fabrication of dental prosthesis remains unknown. This study was conducted to explore and compare the effect of khat homogenate (KH) on the surface roughness (Ra) and the average color changes (ΔE*) amongst natural teeth and selected shades from different porcelain types, namely, feldspathic metal ceramic (MC) VM13, computer-aided design/computer assisted manufacture (CAD/CAM) feldspathic (Vitablocs Mark II), and multilayer zirconia (Ceramill Zolid PS) porcelains. Materials and Methods: Seventy samples were prepared from natural teeth, feldspathic MC, CAD/CAM Vitablocs Mark II, and zirconia porcelain. The Ra values were measured using a profilometer and expressed in micrometers, whereas the ΔE* values were measured using VITA Easyshade® V spectrophotometer for all samples before and after frequent immersion and thermocycling in KH for 30 days. The surface topography was used to assess the materials surfaces (glazed or polished) after KH immersion by using a white light interferometry machine. Results: Results revealed that the Ra and the ΔE* values of the different types of tested porcelain were influenced by KH. The order of surface roughness values was glazed or polished MC > polished Zircon > polished Vitablocs Mark II > natural teeth. The lowest ΔE* values were recorded for glazed Vitablocs Mark II and MC, and the values could be arranged as polished zircon > natural teeth > glazed zircon > polished MC > polished Vitablocs Mark II. P values were significantly varied (<0.001) among all the tested groups, except the zircon group (>0.05) for both Ra and ΔE*. Conclusions: KH significantly affected both surface parameter and color of glazed or polished porcelain materials and natural teeth.

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