I prefer Cement retained Prosthesis,

the IRM cements which helps us in long term cases where change of crown is easier .

The Problem  encountered with screw retained prosthesis is loosening of the screw which could be overcome.

We prefer cement retained prosthesis but always there is risk of cement deposits on buccal or palatial sides that we can not recognise by X-ray  examinations

But what if we give the right torque .... why would screw retained become loose ? Arent svrew retained easy to maintain? 

Screw retained prosthesis are always better than cemented retained ones. Cement however good but ultimately leach or dissolve with the passage of time. whereas screw can become loose but less often.

Cement retained Prosthesis is also retainded with a smaller screw, the chances that something wrong occurs to our prosthesis are few, but in case of doing so, screw retained prosthesis are way easier to change, wich in some cases becomes imposible with cement retained prosthesis.

Screwed crowns/bridges are easier to maintain, but they need much better implant placement/angulation. they are much  easier to change in future if necessary. cemented crowns are almost impossible to change, possible cementitis wich leads to mucositis and periimplantitis are often. Cemented crowns have also screw retained abutments so loosening a screw is also possible - and then You have much bigger problemso if possible choose always screwed option!

I feel the same but then eventually its the angulation which has to be perfect. Although cement retained ones have good success rates too. 

Thanks every1 for the feedback

I do not do many implants so cemented work better fro me. I have had a screw  come loose and it  took awhile for me to deal with it. I have not had any problems with cement retained abutments but really have do so few  so that any conclusion on which is better is meaningless.

No doubt, screw retained because it makes easier the maintenance in cases of mucositis and periimplantitis which, by the way, are more and more fequent

My Luis, sounds good. Thanks :)

Hi,

According to guide lines the interocculsal space determine the selection of screw or cement retained prosthesis. Cement retained required minimum of 5mm height abutment length, in addition to 2mm for restorative material ( total of 7mm). the most common indication is in single crowns when most of failure occur in screw type.

Hybrids denture, segmented restoration, strategic implants ( BASAL) are good indications for screw retained.

If the crest of the implant is under the level of the gummy, cemented implants are not good because you can not be sure, that you have put away all the spillover of the cement. Most of the periimplantitis is a "cementitis".

A screw , on the other side, is not in all cases a good solution, for example the screw may be on a place where you don't want to have it.

So my way is:

I make an individual abutement combined titan/ceramics, I can form an idividual profile at the border gummy/tooth, which has in most times better esthetics. The abutement of course is fixed with a screw. The crown begins exactly at the edge of the gummy and it is cemented. I have no problems with spillover, no problems with a hole for the screw on the wrong place, less problems, when parts of the gummy gets lost.

With new imprint methods you can manufacture the individual abutement already after the implantation and fix it at the date of reopening. 

height of the crown as it emerges from the mucosa will decide. a larger length will produce more torque on the implant. it would be better to use cement type and allow dislodgement. shorter length , one can use screw type.

 If u guys can open this link. 

https://www.google.ca/url?sa=t&source=web&rct=j&url=http://www.joionline.org/doi/pdf/10.1563/AAID-JOI-D-10-00146&ved=0ahUKEwily_DC_svJAhUIzGMKHQEsAIkQFggoMAM&usg=AFQjCNHm8ODUT-R3VDYCKhxheMbxsoVaRQ&sig2=fU_79sJOXCeeziix2qyeEA

Here is some literature concerning the decision screwed/cemented crowns:

Quintessence Int 46 (2015), Nr. 7, Seite 583-589, doi:10.3290/j.qi.a34077, PubMed:25918762,

Retrospective analysis of loosening of cement-retained vs screw-retained fixed implant-supported reconstructions

Korsch, Michael / Walther, Winfried

Int J Prosthodont 28 (2015), Nr. 2, Seite 127-145, doi:10.11607/ijp.3947, PubMed:25822297, Sprache: Englisch

Screw- Versus Cement-Retained Implant Prostheses: A Systematic Review of Prosthodontic Maintenance and Complications

Ma, Sunyoung / Fenton, Aaron

Int J Oral Maxillofac Implants 29 (2014), Supplement, Supplement, Seite 84-98, doi:10.11607/jomi.2014suppl.g2.1, PubMed:24660192, Sprache: Englisch

Clinical Performance of Screw- Versus Cement-Retained Fixed Implant-Supported Reconstructions- A Systematic Review

Wittneben, Julia-Gabriela / Millen, Christopher / Brägger, Urs

Eur J Oral Implantol 5 (2012), Nr. 4, Seite 355-364, PubMed:23304689, Sprache: Englisch

Cemented versus screw-retained implant-supported single-tooth crowns: a 10-year randomised controlled trial

Vigolo, Paolo / Mutinelli, Sabrina / Givani, Andrea / Stellini, Edoardo

...and for the individual abutements:

Quintessenz Zahntech 38 (2012), Nr. 9, CASE REPORTS, Seite 1014-1023

Die Herstellung individueller Implantatabutments

Eine neue Methode auf Basis von Lithiumdisilikat-Presskeramik

Edelhoff, Daniel / Brix, Oliver / Beuer, Florian / Stimmelmayr, Michael

Hope, it helps,

Rudolf Ritt

As per the literature cemented retained prothesis is better than screw retained prothesis.

What about ur experience? There are many articles in favor of screw retained due to ease of maintenance 

Almost all of the presentations I have seen and the articles I have read, where pictures were shown, display a poorly designed abutment (abutment/crown interface too far subgingival, poor emergence profile) and/or poor abutment/crown marginal adaptation. I have a lot of very well respected colleagues who are screw only proponents and I hope they will not be upset with me for disagreeing.

Removing cement is a skill that is critical to restorative dentistry. Leaving cement creates an iatrogenic disease and is sloppy practice. Given that we are all human, cement enough crowns and every once in a while these things do happen, even to the best of us. But, I maintain that a sloppy or unlucky clinician can get “screwed” more often using screws then cement.

As an addendum, there are many indications for a screw retained restoration and I do those.  My argument is against the all or nothing philosophy.  There are times that warrant a screw and there are times that warrant an abutment/crown cement interface.

Screw retainer crowns showed less failure compared to cement retained in longer follow ups.