Comparison of Flexural Strength of Different CAD/CAM PMMA‐Based Polymers

Alp, Gülce; Murat, Sema; Yılmaz, Burak

doi:10.1111/jopr.12755

Cited by 77 publications

(97 citation statements)

References 39 publications

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“…With or without the aging regimen, the chemically cured PMMA resin has inferior mechanical properties when compared to the auto-mixed bis-acryl and CAD/ CAM milling materials. 3,5,6,13,15,21 Inferior mechanical properties in hand-mixed self-cured monomethacrylate provisional restorations might be from the nature of the material preparation and molecular structure. 3,7 Difficulty in controlling air bubbles and porosity during the manual mixing of monomethacrylate resins may lead to compromised mechanical strength, whereas the self-mixing cartridge delivery system of the bis-acryl resin provides better control to its component proportions and to minimal air entrapment.…”

Section: Discussionmentioning

confidence: 99%

Comparison of fracture strength after thermo-mechanical aging between provisional crowns made with CAD/CAM and conventional method

2020

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PURPOSE. The objectives of this study were to evaluate the fracture strength and fracture patterns of provisional crowns fabricated from different materials and techniques after receiving stress from a simulated oral condition. MATERIALS AND METHODS. A monomethacrylate-based resin (Unifast Trad) and a bis-acryl-based (Protemp 4) resin were used to fabricate provisional crowns using conventional direct technique. A milled monomethacrylate resin (Brylic Solid) and a 3D-printed bis-acrylate resin (Freeprint Temp) were chosen to fabricate provisional crowns using the CAD/CAM process. All cemented provisional crowns (n=10/group) were subjected to thermal cycling (5,000 cycles at 5°-55ºC) and cyclic occlusal load (100 N at 4 Hz for 100,000 cycles). Maximum force at fracture was tested using a universal testing machine. RESULTS. Maximum force at fracture (mean ± SD, N) of each group was 657.87 ± 82.84 for Unifast Trad, 1125.94 ± 168.07 for Protemp4, 953.60 ± 58.88 for Brylic Solid, and 1004.19 ± 122.18 for Freeprint Temp. One-way ANOVA with Tamhane post hoc test showed that the fracture strength of Unifast Trad was statistically significantly lower than others (P<.01). No statistically significant difference was noted among other groups. For failure pattern analysis, Unifast Trad and Brylic Solid showed less damage than Protemp 4 and Freeprint Temp groups. CONCLUSION. Provisional crowns fabricated using the CAD/CAM process and the conventionally fabricated bis-acryl resins exhibited significant higher fracture strength compared to conventionally fabricated monomethacrylate resins after the aging regimen. Therefore, CAD/CAM milling and 3D printing of provisional restorations may be good alternatives for long term provisionalization.

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Section: Discussionmentioning

confidence: 99%

Comparison of fracture strength after thermo-mechanical aging between provisional crowns made with CAD/CAM and conventional method

2020

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“…The CAD/CAM technologies are used for the fabrication of various ceramic restorations, including inlays, onlays, crowns, and fixed partial dentures [ 202 ]. More recently, several researchers [ 203 , 204 , 205 , 206 , 207 , 208 , 209 , 210 , 211 ] investigated the use of CAD/CAM technologies for the fabrication of PMMA dental prostheses and compared the materials’ properties and various aspects of the conventional and CAD/CAM PMMA materials. In contrast to the conventional “flask–pack–press” technique, CAD/CAM techniques commonly use rapid prototyping and milling techniques [ 208 , 210 ].…”

Section: Applications Of Pmmamentioning

confidence: 99%

Prosthodontic Applications of Polymethyl Methacrylate (PMMA): An Update

2020

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A wide range of polymers are commonly used for various applications in prosthodontics. Polymethyl methacrylate (PMMA) is commonly used for prosthetic dental applications, including the fabrication of artificial teeth, denture bases, dentures, obturators, orthodontic retainers, temporary or provisional crowns, and for the repair of dental prostheses. Additional dental applications of PMMA include occlusal splints, printed or milled casts, dies for treatment planning, and the embedding of tooth specimens for research purposes. The unique properties of PMMA, such as its low density, aesthetics, cost-effectiveness, ease of manipulation, and tailorable physical and mechanical properties, make it a suitable and popular biomaterial for these dental applications. To further improve the properties (thermal properties, water sorption, solubility, impact strength, flexural strength) of PMMA, several chemical modifications and mechanical reinforcement techniques using various types of fibers, nanoparticles, and nanotubes have been reported recently. The present article comprehensively reviews various aspects and properties of PMMA biomaterials, mainly for prosthodontic applications. In addition, recent updates and modifications to enhance the physical and mechanical properties of PMMA are also discussed.

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“…It is meaningful that the wear pattern of the 3D printing material is experimented. Some comparative studies of the physical properties of materials made using the milling and the conventional method have been reported [ 20 , 21 ], but no comparison with the 3D printing method has been reported. This study investigated the wear patterns of three kinds of resin materials fabricated by 3D printing, milling, and conventional self-polymerizing.…”

Section: Introductionmentioning

confidence: 99%

Wear Resistance of 3D Printing Resin Material Opposing Zirconia and Metal Antagonists

et al. 2018

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3D printing offers many advantages in dental prosthesis manufacturing. This study evaluated the wear resistance of 3D printing resin material compared with milling and conventional resin materials. Sixty substrate specimens were prepared with three types of resin materials: 3D printed resin, milled resin, and self-cured resin. The 3D printed specimens were printed at a build angle of 0° and 100 μm layer thickness by digital light processing 3D printing. Two kinds of abraders were made of zirconia and CoCr alloy. The specimens were loaded at 5 kg for 30,000 chewing cycles with vertical and horizontal movements under thermocycling condition. The 3D printed resin did not show significant difference in the maximal depth loss or the volume loss of wear compared to the milled and the self-cured resins. No significant difference was revealed depending on the abraders in the maximal depth loss or the volume loss of wear. In SEM views, the 3D printed resin showed cracks and separation of inter-layer bonds when opposing the metal abrader. The results suggest that the 3D printing using resin materials provides adequate wear resistance for dental use.

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Comparison of Flexural Strength of Different CAD/CAM PMMA‐Based Polymers

Abstract: The flexural strength of CAD/CAM PMMA-based polymers was greater than the flexural strength of bis-acrylate composite resin, which had a greater flexural strength compared to conventional PMMA resin.

Cited by 77 publications

References 39 publications

Comparison of fracture strength after thermo-mechanical aging between provisional crowns made with CAD/CAM and conventional method

Comparison of fracture strength after thermo-mechanical aging between provisional crowns made with CAD/CAM and conventional method

Prosthodontic Applications of Polymethyl Methacrylate (PMMA): An Update

Wear Resistance of 3D Printing Resin Material Opposing Zirconia and Metal Antagonists

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