Swiss dental resin producer Saremco Dental AG has launched a brand new photopolymer resin for 3D printed everlasting restorations similar to crowns, inlays, onlays, and veneers. Previous to its launch, the CROWNTEC resin was subjected to routine conformity evaluation providers and premarketing by international certification agency TÜV SÜD, a notified physique based on the EU’s Medical Gadget Directive.
The resin was additionally the topic of analysis on the College of Zurich, Switzerland, which confirmed that the UV-curable CROWNTEC could also be a worthy competitor to conventional ceramic dental crowns. The work by the College’s Heart of Dental Medication pitted the resin towards three conventional particle-filled composite ceramics in a battle of fracture load testing.
The 4 supplies have been used to manufacture a complete of 180 samples of dental crowns various in wall thickness (zero.5mm, 1mm, 1.5mm), with the resin 3D printed on an ASIGA system. Thermomechanical loading and fracture testing have been carried out on the dental crowns utilizing the mechanical property testing amenities accessible on the college.
Dental crowns with various wall thicknesses (zero.5mm, 1mm, 1.5mm). Picture through the College of Zurich.
Toppling the ceramic throne
Ceramic or porcelain crowns are a preferred alternative in dentistry attributable to their resemblance to bone, each when it comes to coloration and texture. Though with decrease mechanical properties relative to their gold or silver counterparts, ceramics stay the dental restoration materials of alternative world wide. For an experimental light-curable resin to surpass classical porcelain dental prosthetics in reputation, it must show superior mechanical properties, resemble bone and be inexpensive. So how did Saremco’s resin stack up?
Fracture testing the resin
The 3D resin clocked in with a Younger’s modulus of four.5GPa, in comparison with the normal ceramics which various between 10 – 15GPa. A decrease Younger’s modulus means a cloth is extra elastic, so it’s much less vulnerable to fracture underneath tensile loading. The normal ceramics have been discovered to be extra brittle and would danger shattering underneath important stresses.
The researchers decided the 3D resin had a imply loading pressure of 1479N for group 1.5mm. Conversely, the normal ceramics pulled in imply loading forces of 1580N, 1251N and 1516N, that means the 3D resin may survive a better brunt pressure than one of many ceramics with out shattering however will not be far behind the opposite two. Naturally, the imply loading pressure of every materials elevated with wall thickness as anticipated. It was decided, then, that the dental resin had roughly equal or preferable related mechanical properties to the normal ceramic crowns discovered within the dental trade at the moment.
SLA fabricated die and restorations. Photographs through the College of Zurich.
Additional particulars of the examine may be discovered within the paper titled ‘Fracture load of CAD/CAM-fabricated and 3D-printed composite crowns as a perform of fabric thickness’. It’s co-authored by Zimmerman M., Ender A., Egli G., Ozcan M., and Mehl A.
Dental resins are required to own a sure degree of toughness and sturdiness as they are going to be in a relentless state of use as soon as utilized. Final yr, SLA 3D printer producer Formlabs introduced its Digital Denture resin, with the qualities obligatory for it for use for direct printed dental prosthetics, at a commerce present in Las Vegas. Earlier this yr, Formlabs additionally introduced a partnership with BEGO that may permit dental professionals to make use of BEGO’s new main dental supplies with Formlabs’ resin printers for short-term and everlasting restorations.
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Featured picture exhibits dental restorations printed with Saremco CROWNTEC resin. Photograph through Saremco.
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