Comparative evaluation of the effect of three medications on the color stability of two commercially available acrylic resin denture teeth after thermocycling – An in vitro study

Pande, Neelam; Kulkarni, Sayali; Jaiswal, Priti; Chahande, Jayshri

doi:10.4103/ijmd.ijmd_1_19

Cited by 3 publications

(8 citation statements)

References 27 publications

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“…Each color measured was expressed in values according to the CIELAB parameters (L*, a* and b*) where L* is lightness/darkness (100/0: completely white/completely black), a* (red-green) and b* is yellow-blue chromatic coordinates. Values for coordinates a* and b* can be either positive (+) or negative (−), with positive values representing the color more towards red (a*) or yellow (b*) shade and a negative value indicating more towards green (a*) or blue (b*) [a*=green (−a), and red (+a) axis, and b*=blue (−b), and yellow (+b) axis] [ 31 ]. For both samples (1 and 2), an average was calculated from 3 measurements for each coordinate.…”

Section: Methodsmentioning

confidence: 99%

“…For sample 1 (prefabricated composite shade guide corresponding to vita classical shade guide), mean (average) values and standard deviations were obtained for each shade tab in both shade guides (3 independent measurements) of CIELAB values (L*, a*, b*). The differences of each value for each corresponding shade guide were expressed as delta E (ΔE), which was calculated according to the equation [ 31 , 32 ]:…”

Section: Methodsmentioning

confidence: 99%

“…This delta E* represented the magnitude of color difference between each specimen without indicating the direction towards which the color differed. Various levels of differences for each color coordinate (ΔL*, Δa*, Δb*) were denoted using National Bureau of Standards (NBS) unit for critical remarks of color differences [(0.0 to 0.5 – almost the same); 0.5 to 1.5 – slightly different; 1.5 to 3.0 – perceivably different; 3.0 to 6.0 – remarkably different; 6.0 to 12.0 – extremely marked different; ≥12.0 – different color)] [ 26 , 31 ]. For verifying the clinical significance of obtained magnitude of color differences (ΔE) on the clinical acceptability/perceptibility threshold (CAT/CPT), a value of ΔE less than 1 was considered as not appreciable, between 1 and 3.3 or less as appreciable by skilled operators only and therefore clinically acceptable, while more than 3.3 could be appreciated by anyone (layman) and therefore was clinically unacceptable [ 32 ].…”

Section: Methodsmentioning

confidence: 99%

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Comparison of Composite Resin (Duo-Shade) Shade Guide with Vita Ceramic Shades Before and After Chemical and Autoclave Sterilization

Gupta,

Sayed,

Gupta

et al. 2023

Med Sci Monit

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Background This study aimed to compare a composite resin (Duo-Shade) shade guide with Vita ceramic shades before/after chemical and autoclave sterilization. Material/Methods Color values (L*a*b*) were recorded directly from shade tabs of prefabricated composite resin (Brilliant NG Universal Duo-Shade) and ceramic (Vita classic) shade guide with a calibrated spectrophotometer (Vita Easy Shade Advance 4.0). Seventy-two composite resin disk samples with 6 different shades (A1/B1, A2/B2, A3/D3, A3.5/B3, A4/C4, and C2/C3) (n=12 each) were divided into 2 groups (Gp) – Gp A (Autoclave) and Gp C (Chemical) (15 cycles) – to assess their influence on respective shades. Mean values calculated the color differences (ΔE) while differences in color values (L*a*b*) were graded on the National Bureau of Standards (NBS) 6-grade scale and assessed for Clinical Acceptance/Perceptible Threshold (CAT), (CPT). All differences were considered significant if the color difference ΔE was ≥3.3. Results Only 2 out of 12 Shade tabs (C2C3, A4C4) of composite resin matched to Vita shade tab C2 and C4 (ΔE ≤3.3). Both groups showed notable color differences after respective sterilization protocols, with color differences in Gp A significantly higher than Gp C (ΔE ≥3.3). Within groups, all shades in Gp A showed remarkably different color changes, with shade C2C3 and A1B1 being denoted as clinically unacceptable. Conclusions Manufacturer-provided shade guides do not match ceramic shades as claimed and chemical sterilization using 10% Deconex was associated with less color changes than with autoclave sterilization.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Comparison of Composite Resin (Duo-Shade) Shade Guide with Vita Ceramic Shades Before and After Chemical and Autoclave Sterilization

Gupta,

Sayed,

Gupta

et al. 2023

Med Sci Monit

View full text Add to dashboard Cite

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“…until fracture using a universal testing machine (Instron 1195, USA, 50 kg full scale) ( 21), (14,12) Figure (3). The load at failure was recorded in (kg) multiplication to 9.81to obtain the bond strength in (N) in compliance to Japanese Standard for acrylic teeth (JIST 6506, 1989) (22).…”

Section: Shear Bond Strength (Sbs)testmentioning

confidence: 99%

“…the control group that exhibited the largest reduction in SBS (25.80%). This is Due to recurrent expansions and contractions produced by temperature changes, the bond strength of two different materials decreases after 100 hours of artificial aging (22). Both T. Hole and Aluminablasting mechanical treatment groups exhibited equal percentage reductions of (12.36% and 13.24%), respectively.…”

Section: Iv-evaluatingmentioning

confidence: 99%

Evaluation Of Fusion Liquid Efficiency In Improvement Of Shear Binding Strength Of Synthetic Teeth To Thermo-Plastic Denture Material

Mohammed Ridha,

Ezat abdul almajeed

2022

MDJ

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Background: Due to increased chewing capability, one of the most common problems with dentures is that prosthetic teeth can come loose from the denture. The mechanical design of the connection between thermoplastic base materials and acrylic teeth has increased the problem of tooth debonding. Objective: The current study was conducted to assess the shear bind strength of artificial teeth to thermoplastic resin utilizing fusing liquid and mechanical modifications (Alumin-ablasting, T. hole) of tooth ridge lap before and after 100 hours of accelerated ageing. Materials and method: A total 120 maxillary central incisors have been chosen and grouped into 6 groups of 20 samples each, according to surface treatments. each group subdivided into before and after 100hrs according to artificial ageing (n=10). Shear bond strength test conducted by a universal measurement apparatus with crosshead speed 0.5mm / min. Data were statistically analyzed by one-way ANOVA and Tukey’s (HSD). Results: Various surface treatments techniques significantly affected the shear bond strength with statistical high difference in mean bond strength after various surface treatments compared to the control group at (p < 0.001). Regarding surface treatment, Dual treatment of “alumina-blasting + fusion liquid” showed considerably elevated strength compared to alumina-blasting alone at (p < 0.001). also “T. hole +fusion liquid” treatment yielded a significant elevation in strength reading compared to T. hole alone at (p < 0.001). Great significant full in strength value was noted in all groups post 100hrs of artificial ageing process at (p < 0.001). The combined surface treatment revealed the lowest percentage reduction in SBS yielded in (T. Hole + fusion), (Alumina-blasting + fusion) than T. hole alone and alumina-blasting alone after 100hrs of artificial ageing process. Conclusion: Surface treatment with T. hole + fusion liquid or alumina-blasting + fusion liquid enhanced SBS.

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Evaluation Of Silano Adhesive Efficiency in Improvement of Shear Binding Strength of Synthetic Teeth to Thermo-Plastic Denture Material

Mohammed Ridha,

Ezzat Abdulmaged

2023

TJDS

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Background: One of the most serious problems concerning denture performance is the possibility of prosthetic tooth displacement due to increased chewing efficiency. The nature of the mechanical bonding between thermoplastic denture base materials and acrylic teeth has aggravated the problem of tooth debonding. The study aiming to examine the strength of shear bond between prosthetic teeth and thermoplastic base material utilizing silano (silane coupling agent) and mechanical surface modifications (Alumin-ablasting, T. Shape hole) of tooth ridge lap pre and post (100 hrs.) of accelerated ageing conditions. Materials and method: The surface treatments of (120) maxillary central incisors were chosen and grouped into 6 groups of 20 samples each. Each group split into before and after (100hrs.) according to ageing (n=10). Measurement of shear bonding strength applied by a universal testing equipment with 0.5mm/min crosshead speed. Statistical analyses were done using one-way ANOVA test and Tukey’s (HSD) test. Results: Statistics showed high significant variation in average binding force after several surface manipulations in contrast to the control group at (P < 0.000). Regarding surface manipulations, dual treatment of “Alumina-blasting + silano “revealed significant elevation of binding strength in compare to “alumina-blasting” alone (P < 0.001). Similarly, with “T. hole + silano” yielded in greatly increased bonding strength compared to using “T. hole” alone (P < 0.001). a great reduction in bonding strength value was indicated along all treated groups after ageing process (P < 0.000) except the group treated with “T. Hole + silano” show non-significant variations at (p = 0.112). Conclusion: combination treatment (chemo-mechanically) with “T. Hole + silano” improve shear binding strength and not effected with ageing process.

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Comparative evaluation of the effect of three medications on the color stability of two commercially available acrylic resin denture teeth after thermocycling – An in vitro study

Cited by 3 publications

References 27 publications

Comparison of Composite Resin (Duo-Shade) Shade Guide with Vita Ceramic Shades Before and After Chemical and Autoclave Sterilization

Comparison of Composite Resin (Duo-Shade) Shade Guide with Vita Ceramic Shades Before and After Chemical and Autoclave Sterilization

Evaluation Of Fusion Liquid Efficiency In Improvement Of Shear Binding Strength Of Synthetic Teeth To Thermo-Plastic Denture Material

Evaluation Of Silano Adhesive Efficiency in Improvement of Shear Binding Strength of Synthetic Teeth to Thermo-Plastic Denture Material

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