Anon asks:
I have recently started using titanium-nitride coated and zirconia abutments. I have seen more of my crowns debond and dislodge from these kinds of abutments than the previous abutments. I am not doing anything different. Same cement and same protocol. Have any of you experienced this? What is causing this?
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Titanium nitride has a high degree of lubricity. Great for cutting tools, not so good to bond to. Are you sure about the coating? Some titanium abutments are gold colored by anodizing, the short Straumann solid, for example. Who’s the abutment manufacturer?
The next question is; Where does the debonding occur? Does the remaining cement adhere to the restoration or to the abutment? What cement does the abutment manufacturer recommend?
You could also try air abrading the parts that don’t bond well (carefully protecting margins and other exposed junctions.)
I am a territory rep for an implant company. I get this question often. Recently, I sat in on a case with a Dr. who was performing this procedure. He has been utilizing Amalgam Bond, following the dentin procedure. The results have been great!! I must tell you that my company recommends no specific cement for zirconia restorations.
Hello fellow collegues, First problem manufacturers have no recommendations on these products… secondly traditional bonding techniques ex. dentin bonding agents can’t work they are specifically for dentin… in addition the abutment should have some anti-rotation affect built in ex. flat mesial and dital walls,, but definitely not “round” …( Lab must be talked to about this) micro-etching definitely helps..Cemented over 240 ceramic and zirconia abutments I now use durelon for permanent cement and temrex for temporary cement. This has been working for years for our practice but Durlelon is not in “vogue” so I rarely share this info…BTW have my paper coming out on this look for it in PPAD… any questions… email to drdean17@aol.com… hope this helps..
Please explain more clearly.Assuming you are talking about a lab produced zirconia bonded to titanium abutment[similar to Zireal abutment from 3i],do you mean the zirconia part of the abutment is debonding from the titanium or the crown debonding from the abutment?
Dear Anon, please would you give a bit more detail. It sounds like your crowns are not bonding to the abutment? Are you using a zirconia abutment with a porcelain bonded to zirconia crown on the abutment?
I have seen the zirconia debonding from the titanium on some cases. I had tried to stain the bright white abutment “suggested by my rep”, but some zirconia abutments have a chemical bond that will be damaged by the high oven temps. I am now able to create shaded zirconia abutments that eliminate that problem. They look great and the shade is throughout the abutment not just on the surface. If the crown is not bonding, ask your lab to leave flat surfaces or slight grooves on the abutment. The Lab can also slightly sandblast the seating surface.