Screw retained Zr works with 3Shape system

Tero

Tero

Member
Full Member
Messages
42
Reaction score
4
Hi.

I'm intrested about do you make any one-piece abutments and screw retained implant bridges in zirconium with 3shape?

I don't mean abutments with Ti interface.
What millingmachine do you use and what cam program.

What abutmentlibrarys do you use in 3shape?

We do this kind of works with 3shape with good results, but I'm intrested about your experience.

v.php
 
Tero

Tero

Member
Full Member
Messages
42
Reaction score
4
img3575eu.th.jpg
[/URL][/IMG]

and here is working photo...
 
Last edited:
Slipstream

Slipstream

Active Member
Full Member
Messages
361
Reaction score
3
The latest software update includes screw retained crowns (using the anatomical library not hand sculpted as previously) and screw retained bridges have always been possible. The reason they are not done much is for multi unit you need the D800 and many milling machines cannot do them either, so people sell what they can make inhouse.

Core3d have their own library for 1 piece abutments, 2 piece librarys tend to come from the interface manufacturer.

Anyone who has a full library, is going to want to mill it for you and not give you the ability to mill your own abutments, unless they can charge a fair amount for the data.
 
Tero

Tero

Member
Full Member
Messages
42
Reaction score
4
I agree with you that you need good millingmachine to make abutment interfaces.
What did you mean that D800 scanner is needed? We have D700 scanner and it works fine...
 
Slipstream

Slipstream

Active Member
Full Member
Messages
361
Reaction score
3
I agree with you that you need good millingmachine to make abutment interfaces.
What did you mean that D800 scanner is needed? We have D700 scanner and it works fine...

For singles and 2 unit bridges, the D700 is fine as you say

More than three implants on a single bar is not recommended as the margin for error increases and you risk losing the passive fit you want.

D800 should be good for a multiunit.
 
Tero

Tero

Member
Full Member
Messages
42
Reaction score
4
Have you test a differes of D700 and D800? Made same bridge with different scanners?
Do you think that D800 scanners 5 megapiksel camera is better, or is there some other reason for better accurasy?
 
Slipstream

Slipstream

Active Member
Full Member
Messages
361
Reaction score
3
Thats from the manufacturers guidelines, if you read the post buy 3shapesupport guy, although discussing white light v laser - he says that the camera resolution is a major factor in precision more so than the light source. 1.3 v 5.0 should be a step in the right direction.
 
Y

YMS96

New Member
Messages
616
Reaction score
4
Won't a 1 piece Zr abutment crack when torqued down?
 
BobCDT

BobCDT

Well-Known Member
Full Member
Messages
2,870
Reaction score
521
Interesting thread!
Yes, zirconia abutments and zirconia screw seats can ( and will) fail. I know this first hand. Some implant interfaces work better than others. For instance, we have had numerous failures with the Astra interface. In addition, it's necessary to shorten the engaging aspect of the abutment to help prevent breakage on many interfaces. This is absolutely worrisome, may lead to screw loosening and is not proper engineering.
Implant prosthetic interfaces have been engineered to facilitate reduction of micro movement, leakage while idealizing intimacy of fit. To alter the abutment interface can be a major compromise.
Better way to go, hybrid, zirconia abutment or crown with a titanium insert.
B
 
P

paulg100

Well-Known Member
Full Member
Messages
2,163
Reaction score
42
yep i agree with all that.

I warn my clients and leave it for them to make the final choice.

We only ever done 1 with astra through atlantis, and guess what..it failed within about 2 weeks.
 
Slipstream

Slipstream

Active Member
Full Member
Messages
361
Reaction score
3
Sorry - should have been clearer - what we do is a Zr crown with Ti Interface - though I prefer a custom Zr abutment and adhesive retained crown on top - but it costs more - not much in the grand scheme of a patients dental bill, but enough apparently. Our implant specialist does not favour the full Zr, though we have added them to the new pricelist.
 
Last edited:
Tero

Tero

Member
Full Member
Messages
42
Reaction score
4
Won't a 1 piece Zr abutment crack when torqued down?
1 piece zr abutments are not problem if you know what are you doing and if you have right kind of screw. It is allso important how manufacture these abutments and what kind of machine is used.

It is truth that zr abutments can failure in cases that Ti abutments will stand.
But, zr abutments won't break by itself.

Think about it this way. In case that zr abutment will break for exsample becouse of bad impression with wrong implantposition, Ti abutment will bend. This can cause lot of more problems to implants.

When you have hi-quality zr abutments and everybody in team knows what to do, no problem.

About of strenght of zr abutments,for exsample custom made Astra 4.5-5.0 (lilac)zr abutment can take more than 1400N force in 45 degree angle.
(Turku University pilot test, made in Finland)
Who can bite this to pieces?
:cool:

aimg27.imageshack.us_img27_8928_abutments.jpg

Uploaded with ImageShack.us
aimg27.imageshack.us_img27_8928_abutments.jpg
 
Slipstream

Slipstream

Active Member
Full Member
Messages
361
Reaction score
3
Nice lean lines Tero - what was the milling machine?
 
JohnWilson

JohnWilson

Well-Known Member
Full Member
Messages
5,487
Reaction score
1,575
1 piece zr abutments are not problem if you know what are you doing and if you have right kind of screw. It is allso important how manufacture these abutments and what kind of machine is used.

It is truth that ZI abutments can failure in cases that Ti abutments will stand.
But, zr abutments won't break by itself.

Think about it this way. In case that zr abutment will break for exsample becouse of bad impression with wrong implantposition, Ti abutment will bend. This can cause lot of more problems to implants.

When you have hi-quality zr abutments and everybody in team knows what to do, no problem.

About of strenght of zr abutments,for exsample custom made Astra 4.5-5.0 (lilac)zr abutment can take more than 1400N force in 45 degree angle.
(Turku University pilot test, made in Finland)
Who can bite this to pieces?
:cool:

aimg27.imageshack.us_img27_8928_abutments.jpg

Uploaded with ImageShack.us

I have zero knowledge of milling strategies only cad but as it relates to breakage of ALL ZI abutments I feel they fail more to manufacturer/installer error rather than product limitations.

More times than not when a Dr is seating one of these abutments and tries to use the screw to pull the abutment into place there can be an issue. We make a seating jig for all our abutments but make sure we tell our clients that even if it looks very easy to place please use the jig to center everything up.

It can save a lot of headaches this way
aimg27.imageshack.us_img27_8928_abutments.jpg
 
actittle

actittle

Señor Member
Full Member
Messages
362
Reaction score
74
I have done a lot of full zirconia abutments over the past few years, I've never had one break.
 
CoolHandLuke

CoolHandLuke

Idiot
Full Member
Messages
10,078
Solutions
1
Reaction score
1,411
we've had one or two breaks. but only due to bar fights.
 
Tero

Tero

Member
Full Member
Messages
42
Reaction score
4
Back to first question.
What millingmachine do you use and what abutment librarys?
Cam? Open mind, Delcam, ???
What scanner?
 
Top Bottom