Tiếng Việt
A single disc made of both tooth and denture base material, for the complete fabrication of dentures in one uninterrupted milling process: that’s Ivotion. You might ask yourself: “How is that possible?” And: “Does that even work?” And apart from anything else: ” Will the dentures be ˈstrongˈ enough in the long term?”
With the launch of Ivotion, a single disc for the fabrication of monolithic, complete dentures in in just one milling process, Ivoclar has taken another revolutionary step forward in the digital fabrication of removable dentures. Ivotion is an intelligent combination of high-grade proven tooth and denture base materials in a single disc of two colours, providing dental laboratories that use the digital workflow with an efficient and predictable monolithic solution. The key here is: A special geometry inside the disc, coupled with a homogeneous bond between its high-grade PMMA materials, ensures reliable results that are simple to produce and offer long-term stability.
Monolithic dentures
Fig. 1:
Ivotion – Tooth and gingiva material in a single monolithic disc, suitable for permanent complete dentures.
Dentures from one disc made of two materials. How reliable are these dentures really?
Numerous studies and long-term experience have shown that denture base material and the bond between the denture base and teeth (tooth loss) present the two biggest “weaknesses” of removable dentures. For example, a study conducted in 2010 found that removable dentures generally offer a very long lifespan (on average 15.8 years for the lower jaw and 19.4 years for the upper jaw). However, over a monitoring period from 1984 to 2009, denture base fractures occurred in 5.8% of patients, while another 5.8% of patients (two sets of dentures) and 10.9% of patients (one set of dentures) even reported a loss of ‘teeth’ (Dorner, S., Zeman, F., Koller, M., Lang, R., Handel, G., and Behr, M. (2010) Clinical performance of complete dentures: a retrospective study, Int J Prosthodont 23, 410-417).
High-quality denture base material and a strong bond with the tooth material are therefore of critical importance. Ivotion is an excellent solution to both problems, with an approach that combines two different materials in a single disc and requires just a single milling process.
Material quality
The tooth and gingiva materials developed for Ivotion are the result of intensive research work. They build on combinations of established and clinically proven products. This means that they are guaranteed suitable for use in permanent restorations in complete denture prosthetics.
As a result, the tooth and gingiva materials not only meet the internal quality criteria of Ivoclar Vivadent AG, which are already very stringent and rigorous, but they also comply with the standards applicable for similar products.
Material testing was carried out based on[1] EN ISO 10477:2018 (tooth material) and EN ISO 20795-1:2013 (gingiva material).
Table: Illustration of the values measured on the basis of the respective standards ISO 10477:2018 (tooth material) and ISO 20795-1:2013 (gingiva material). The results demonstrate compliance with the requirements for restoration with permanent dentures. The optimized fracture resistance of the gingiva resin is particularly noteworthy. This means increased stability with regard to crack initiation (Kmax) and greater resistance (Wf) when defects occur. The risk of fractures and related repairs is reduced as a result.
Diagram 1 and 2: Fracture toughness properties Kmax and FW based on ISO 20795-1:2013, internal test. Sample values are shown. The green line indicates the minimum requirements (Kmax ≥1.9 MPa*m1/2, Wf ≥900 J/m2) for high-impact denture materials in accordance with the standard. The diagrams compare the fracture toughness values of Ivotion with those of conventional and digital products from Ivoclar for the fabrication of denture bases.
