You have most likely seen aggressive propaganda over the past few years touting a pink crown, specifically used for intra-oral try-ins to combat “c ontamination”. First off, “contamination” leads the audience to believe that zirconia pediatric crowns cannot be disinfected. Which is false, they are 100% autoclavable. Zirconia can withstand incredibly high temperatures without affecting the structural integrity, shade or finish. To put things into perspective, after applying the ceramic glaze, we fire Zirconia Kinder Krowns® at a temperature of 900°C (considerably higher than the standard autoclave temperature of 212°F).
The truth behind the pink facade is that injection molded crowns lack mechanical retention. They cannot contain undercuts and rely purely on chemical adhesion. Since they lack this critical feature, you are required to use a separate crown for intraoral try-ins and a special cement. Even after following this recommended protocol, clinicians continue to have issues with debonding. The zirconia we use in dentistry is zirconium dioxide, and the oxide part is where bonding happens. It is the functional phosphate groups that bond to the zirconia. After a crown is tried into a patient’s mouth, the bonding sites on the zirconia crown become occupied by phosphate groups found in the saliva.
What makes Zirconia Kinder Krowns® different is the intaglio. During the manufacturing process, we add screw-like threads to crown walls, which mechanically locks the restoration to the tooth. These threads also significantly increase the surface area for the cement to chemically bond to the crown. The chemical bond to ceramics in general is weak, therefore it is imperative to incorporate mechanical retention. This key difference has been a part of our design since Zirconia Kinder Krowns® officially launched in 2012.
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