Evaluation of the color stability of 3D printed resin according to the oxygen inhibition effect and temperature difference in the post-polymerization process

Lee, Sang-Yub; Kim, Do-Hyun; Lee, Donghwan; Kim, Seok Gyu; Kim, Jong‐Eun

doi:10.1016/j.jmbbm.2022.105537

Cited by 6 publications

(9 citation statements)

References 53 publications

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“…Another explanation for AM's susceptibility to discoloration may be related with potentially lower degree of conversion of AM resin. A recent study has reported an inverse relationship between the degree of conversion and color stability 8 and considering that AM was the only additively manufactured material tested, higher stainability can be considered expectable due to potential low degree of conversion of AM resin, compared with the prepolymerized specimens.…”

Section: Discussionmentioning

confidence: 98%

“…3 However, conventional PMMA's polymerization shrinkage, susceptibility to bacterial plaque accumulation, and possible allergic potential due to release of unreacted monomers, 4 along with the advancements in computeraided design and computer-aided manufacturing (CAD-CAM) technologies have increased the popularity of additively and subtractively manufacturing denture bases. [5][6][7][8] Reinforcement of PMMA with fibers and nanoparticles to improve different physical and mechanical properties has been investigated broadly. 1 Even though subtractively manufactured prepolymerized disks has improved mechanical properties, 9 reinforcement of prepolymerized PMMA disks with nanographene has also been introduced.…”

Section: Introductionmentioning

confidence: 99%

“…Polymethyl methacrylate (PMMA) is the most commonly used material for denture bases 1,2 considering its advantages such as ease of processing, repairing, and polishing, low density, being cost‐effective, and adequate physiochemical properties 3 . However, conventional PMMA's polymerization shrinkage, susceptibility to bacterial plaque accumulation, and possible allergic potential due to release of unreacted monomers, 4 along with the advancements in computer‐aided design and computer‐aided manufacturing (CAD‐CAM) technologies have increased the popularity of additively and subtractively manufacturing denture bases 5–8 …”

Section: Introductionmentioning

confidence: 99%

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Effect of coffee thermocycling on the surface roughness and stainability of denture base materials with different chemical compositions manufactured with additive and subtractive technologies

Çakmak,

Weber,

Donmez

et al. 2023

J Esthet Restor Dent

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ObjectiveTo evaluate the effect of coffee thermocycling (CTC) on the surface roughness (Ra) and stainability of denture base materials with different chemical compositions fabricated by using additive and subtractive manufacturing.Materials and MethodsDisk‐shaped specimens were additively (FREEPRINT denture, AM) or subtractively (G‐CAM, GSM and M‐PM, SM) fabricated from three pink denture base materials in different chemical compositions (n = 10). Ra was measured before and after polishing, while color coordinates were measured after polishing. Specimens were subjected to CTC (5000 cycles) and measurements were repeated. Color differences (ΔE00) after CTC were calculated. Ra among different time intervals within materials was evaluated by using repeated measures analysis of variance (ANOVA), while 1‐way ANOVA was used to evaluate the Ra of different materials within each time interval and the ΔE00 values. Color coordinates within each material were compared by using paired samples t‐tests (α = 0.05).ResultsRa before polishing was the highest for all materials (p < 0.001), while SM had its lowest Ra after CTC and AM had its lowest Ra after polishing (p ≤ 0.008). Before polishing, AM had the highest Ra among the materials (p < 0.001). After polishing, SM had higher Ra than AM (p < 0.001). After CTC, GSM had the lowest Ra (p ≤ 0.048). SM had the lowest (p ≤ 0.031) and AM had the highest (p < 0.001) ΔE00. CTC decreased the a* and b* values of SM and AM (p ≤ 0.017), and increased the L* values of AM (p < 0.001).ConclusionsPolishing significantly reduced the surface roughness of all materials. CTC did not increase the surface roughness of materials above the clinically acceptable threshold. Only AM had perceptible color change when previously reported threshold values for denture base materials were considered.Clinical SignificanceTested denture base materials may have similar surface stability after coffee thermocycling. However, subtractively manufactured denture base materials may have improved color stability when subjected to long‐term coffee consumption.

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Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of coffee thermocycling on the surface roughness and stainability of denture base materials with different chemical compositions manufactured with additive and subtractive technologies

Çakmak,

Weber,

Donmez

et al. 2023

J Esthet Restor Dent

View full text Add to dashboard Cite

show abstract

“…During UV curing, oxygen in contact with 3D-printed models inhibits polymerization, resulting in an under-cured polymer. 35 Moreover, oxygen can also result in a highly heterogeneous structure. 36 This can interfere with resin polymerization, resulting in incomplete curing, deformations, or low print quality.…”

Section: Discussionmentioning

confidence: 99%

“…The contact of plasticized EVA, under high temperature, with untreated 3D‐printed resin models resulted in the incorporation of resin residues into the EVA matrix, affecting the resulting specimens' surface heterogeneity and mechanical properties. During UV curing, oxygen in contact with 3D‐printed models inhibits polymerization, resulting in an under‐cured polymer 35 . Moreover, oxygen can also result in a highly heterogeneous structure 36 .…”

Section: Discussionmentioning

confidence: 99%

Effect of different materials for conventional and 3D‐printed models on the mechanical properties of ethylene‐vinyl acetate utilized for fabricating custom‐fit mouthguards

Rondón,

Lozada,

Soares

et al. 2023

Dental Traumatology

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Background/AimThe interaction between the ethylene‐vinyl acetate (EVA) with distinct materials utilized for obtaining dental models can affect the performance of resulting mouthguards. This study attempted to evaluate the effect of different materials for conventional (dental stone) or 3D‐printed (resin) models on EVA's physical and mechanical properties and surface characteristics.Material and MethodsEVA sheets (Bioart) were laminated over four model types: GIV, conventional Type IV dental stone model (Zhermak); ReG, resin‐reinforced Type IV dental stone model (Zero Stone); 3DnT, 3D resin printed model (Anycubic) without surface treatment; 3DT, 3D‐printed model (Anycubic) with water‐soluble gel (KY Jelly Lubricant, Johnson & Johnson) coating during post‐curing process. The EVA specimens were cut following the ISO 37‐II standard (n = 30). Shore A hardness was measured before and after plasticization on the contact (internal) or opposite (external) surfaces with the model. The breaking force (F, N), elongation (EL, mm), and ultimate tensile strength (UTS, MPa) were measured using a universal testing machine. Macro‐photography and scanning electron microscopy were adopted for classifying the EVA surface alteration. Data were analyzed by one‐way ANOVA with repeated measures, followed by Tukey's test (α = .05).ResultsPlasticization significantly decreased Shore A values for the tested EVA regardless of the model type (p < .001). Higher F, El, and UTS values were verified for the EVA with 3DT and GIV models compared to ReG and 3DnT (p < .001). 3DnT models resulted in severe surface alteration and a greater reduction of the mechanical properties of the EVA.ConclusionThe interaction of EVA with 3D resin‐printed models without surface treatment or resin‐reinforced Type IV dental stone models significantly affected the physical and mechanical properties of this material. The utilization of water‐soluble gel coating during the post‐curing process of 3D resin printed models improved the mechanical properties of the EVA, similarly when this material was plasticized over conventional Type IV dental stone model.

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Effect of various post-curing light intensities, times, and energy levels on the color of 3D-printed resin crowns

Sahrir,

Ruslin,

Lee

et al. 2024

Journal of Dental Sciences

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Evaluation of the color stability of 3D printed resin according to the oxygen inhibition effect and temperature difference in the post-polymerization process

Cited by 6 publications

References 53 publications

Effect of coffee thermocycling on the surface roughness and stainability of denture base materials with different chemical compositions manufactured with additive and subtractive technologies

Effect of coffee thermocycling on the surface roughness and stainability of denture base materials with different chemical compositions manufactured with additive and subtractive technologies

Effect of different materials for conventional and 3D‐printed models on the mechanical properties of ethylene‐vinyl acetate utilized for fabricating custom‐fit mouthguards

Effect of various post-curing light intensities, times, and energy levels on the color of 3D-printed resin crowns

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