Comparative analysis of leaching residual monomer and biological effects of four types of conventional and CAD/CAM dental polymers: an in vitro study

Xia, Wei; Pan, Yang; Wang, Mingjun; Wang, Yinghui; Lin, Honglei; Jiang, Lei; Dong, Lin; Cheng, Hui

doi:10.1007/s00784-021-04271-2

Cited by 15 publications

(19 citation statements)

References 32 publications

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“…In addition to the superiority of bis-acryl over PMMA, this may be attributed to the presence of surface cracks induced during the milling procedure that may highly influence the biaxial flexural strength results. 24,25 The Tempron provisional material showed a significantly lower biaxial flexural strength compared to Protemp 4 and the 3D printed group in all solutions. This may be attributed to the difficulty in regulating air bubbles and porosity during manual mixing of powder and liquid versus the Protemp 4 resin's auto-mixing cartridge system.…”

Section: Discussionmentioning

confidence: 94%

“…This can be supported by the insignificant effect of the different solutions and mechanical aging on the milled groups. 25 The highly controlled manufacturing conditions of CAD-CAM dental polymer blocks promote a higher degree of monomer conversion and a lower residual monomer due to the formation of longer polymer chains. In addition, it produces a homogeneous and highly cross-linked material structure.…”

Section: Discussionmentioning

confidence: 99%

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Biaxial flexural strength of different provisional restorative materials under chemo‐mechanical aging: An in vitro study

Sadek

Elbanna

2023

Journal of Prosthodontics

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PurposeDurability is a critical factor for the success of long‐term provisional restorations. This study evaluated the effect of different storage media and cyclic loading on the biaxial flexural strength of different types of provisional materials.Materials and methodsDiscs (N = 360, 10 × 2 mm) were prepared from different provisional materials; conventional (Protemp 4, Tuff‐Temp, Tempron), CAD–CAM milled (VITA CAD‐Temp, breCAM.multiCOM), and 3D‐printed (Nextdent C&B MFH) (n = 60). Each material group was subdivided into four subgroups according to the storage media (n = 15): nonaged, artificial saliva, mouthwash, and coffee. The specimens in storage media were placed in an incubator at 37°C for 4 weeks followed by 60,000 simulated chewing cycles. Biaxial flexural strength test was done. Data were analyzed using two‐way ANOVA. Weibull distribution parameters were estimated.ResultsBoth the material and aging protocol showed a significant effect on the biaxial flexural strength. Both Protemp 4 and Nextdent C&B MFH showed a significantly higher biaxial flexural strength before and after aging compared to all other materials. Protemp 4 and Tuff Temp showed a significant decrease in strength with aging. CAD–CAM materials showed higher Weibull moduli.ConclusionsThe 3D‐printed polymethylmethacrylate provisional material presents with both greater biaxial flexural strength and increased durability against chemical and mechanical aging compared to conventional and CAD–CAM milled provisional materials tested.

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Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 99%

Biaxial flexural strength of different provisional restorative materials under chemo‐mechanical aging: An in vitro study

Sadek

Elbanna

2023

Journal of Prosthodontics

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“…21,22 Compared with the traditional method for denture manufacture, CAD/CAM technique provides many advantages, comprising a low monomer content, and improved mechanical and surface properties of PMMA base resin. 23,24 Additionally, CAD/CAM techniques were reported as a time efficient choice since the clinical steps are reduced to two visits instead of five visits in the conventional technique. Also, the postinsertion adjustment visits are reduced.…”

Section: Backg Rou N Dmentioning

confidence: 99%

Patient satisfaction and oral health‐related quality of life for four implant‐assisted mandibular overdentures fabricated with CAD/CAM milled poly methyl methacrylate, CAD/CAM‐milled poly ether ether ketone, or conventional poly methyl methacrylate: A crossover clinical trial

Gomaa

Mostafa

El-Shaheed

2023

J of Oral Rehabilitation

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Background New materials for overdenture base construction were evolved. Thus, more clinical trials are needed to validate these materials. Objective This study aimed to compare the difference between CAD/CAM‐milled poly methyl methacrylate (PMMA), poly ether ether ketone (PEEK) and conventional mandibular implant‐assisted overdentures regarding patient satisfaction and oral health‐related quality of life (OHRQL). Methods This randomised, crossover, clinical study included 18 completely edentulous subjects rehabilitated with three mandibular implant‐assisted overdentures with three different denture base materials opposing a maxillary single denture. These materials were as follows: CAD/CAM‐milled PMMA, CAD/CAM‐milled PEEK and conventional PMMA. Every participant first received each mandibular overdenture in a random manner. After 6 months of each overdenture use, patient satisfaction and oral health‐related quality of life were assessed using visual analogue scale (VAS) and Oral Health Impact Profile (OHIP‐EDENT‐19), respectively, and then crossover to other groups was done. The same was repeated to the last group. Comparison of VAS and OHIP‐EDENT‐19 between groups was done using Kruskal–Wallis test followed by Bonferroni test. Results Regarding all the VAS items, there were statistically significant higher scores for CAD/CAM‐milled PMMA and PEEK than conventional PMMA base except for speech, aesthetic and smell. Regarding OHIP‐EDENT‐19, many items revealed statistically lower problem scores for CAD/CAM‐milled PMMA, and CAD/CAM‐milled PEEK than conventional PMMA base except psychological discomfort, psychological disability and social disability. Conclusion Within the limit of this study, CAD/CAM‐milled PMMA and CAD/CAM‐milled PEEK were recommended as implant‐assisted overdenture bases as it revealed higher patient satisfaction and better oral health‐related quality of life in comparison with conventional PMMA implant‐assisted overdenture.

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“…The amount of residual monomer in samples of cold-polymerized acrylates was lowered to a clinically acceptable level with the aforementioned post-polymerization methods [ 89 ]. Post-polymerization treatments led to an improvement in the mechanical (crush stress) and biological properties of cold-polymerized acrylates, which can be explained by the reduction of the amount of residual monomer [ 90 ]. Regarding heat-polymerized acrylates, post-polymerization methods are not required, given the low values of residual monomer concentration immediately after the polymerization [ 91 ].…”

Section: Release Of Residual Monomermentioning

confidence: 99%

The Use of Acrylate Polymers in Dentistry

et al. 2022

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The manuscript aimed to review the types of acrylate polymers used in dentistry, as well as their chemical, physical, mechanical, and biological properties. Regarding their consistency and purpose, dental acrylate polymers are divided into hard (brittle), which includes acrylates for the production of plate denture bases, obturator prostheses, epitheses and maxillofacial prostheses, their repairs and lining, and soft (flexible), which are used for lining denture bases in special indications. Concerning the composition and method of polymerization initiation, polymers for the production of denture bases are divided into four types: heat-, cold-, light-, and microwave-polymerized. CAD/CAM acrylate dentures are made from factory blocks of dental acrylates and show optimal mechanical and physical properties, undoubtedly better monomer polymerization and thus biocompatibility, and stability of the shape and colour of the base and dentures. Regardless of the number of advantages that these polymers have to offer, they also exhibit certain disadvantages. Technological development enables the enhancement of all acrylate properties to respond better to the demands of the profession. Special attention should be paid to improving the biological characteristics of acrylate polymers, due to reported adverse reactions of patients and dental staff to potentially toxic substances released during their preparation and use.

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Comparative analysis of leaching residual monomer and biological effects of four types of conventional and CAD/CAM dental polymers: an in vitro study

Cited by 15 publications

References 32 publications

Biaxial flexural strength of different provisional restorative materials under chemo‐mechanical aging: An in vitro study

Biaxial flexural strength of different provisional restorative materials under chemo‐mechanical aging: An in vitro study

Patient satisfaction and oral health‐related quality of life for four implant‐assisted mandibular overdentures fabricated with CAD/CAM milled poly methyl methacrylate, CAD/CAM‐milled poly ether ether ketone, or conventional poly methyl methacrylate: A crossover clinical trial

The Use of Acrylate Polymers in Dentistry

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