Tough dentures, very tough!

simon and simon at the smiles centre swindon smashing a denture up by driving over itGreat Fun

Well i got to say, i had a lot of fun in the making of this blog. It comes in the form of a video this time, as just a written blog would not have done it justice.

The Story

There are always new innovative ideas within any industry and the dental industry is definitely brimming with a lot of new products and techniques. A new product and technique that is being used at the moment within the dental laboratories across the uk is pourable denture acrylic. The idea is not new but with new technology and and new products, the pourable denture acrylic is gaining new ground. So we got stuck in, eager to try everything to see if it has merit and worth adoption in our dental laboratory/practice. We found that the new products were extremely fast to use, maybe not simple but certainly a lot quicker and less expensive. Let me first explain the different methods of making an acrylic denture so you can understand better, what all the fuss is about.

The Methods

  1. The standard method – A two part plaster mould is made for the denture and an acrylic putty in squashed between the two halves and then cooked at about 80ºc – 90ºc
  2. The injected method – A two part plaster mould is made for the denture. The two halves are then clamped together before the acrylic putty is injected into the mould and cooked at about 80ºc – 90ºc
  3. The pourable method – a single duplicating gel mould is made for the denture and liquid acrylic is poured into the mould and then cooked at about 50ºc

Advantages vs DisadvantagesThe two simons discussing the killing of a denture by driving a car over it

  1. The standard method has been used for years and it requires no complicated and expensive equipment, as a matter of fact, if my laboratory were to burn down, i could start making dentures in my kitchen with an investment of less than one hundred pounds using this method. the down side to this method is its reproductive quality, while the two haves are clamped together, errors can occur and slight distortions (the finished denture can come out of the flask bigger, which alters the bite).
  2. This is what we use on almost all of our new dentures, the results are amazing, as you’ll see from the video! The downsides are; its not quick and the equipment is extremely expensive compared to any other method. The two major benefits from this method are strength and accuracy.
  3. Although the new products and techniques claim to provide strong dentures, the long term evidence for this has yet to be seen, but my gut tells me we are going to see a lot of fracture issues from this type of denture. The up side? well, to produce a denture in this way is very straight forward; heat the gel and pour over the denture to create the mould, take out the wax denture and fill the mould with liquid acrylic. It may sounds easy but it can be a little bit fiddly, but a skilled technician shouldn’t take too long to master the technique and the whole process is very quick. Another really appealing aspect to the pourable denture is its cost to produce. the gel is reversible so can be used many times (plaster has a one time use only). there is no boiling the wax pattern out of the mould, it is just taken out cleanly and the cooking temperature is low too which also reduces cost.


So why haven’t we adopted the new pourable technique when there are so many benefits? Well, lets look at who benefits from the benefits. With injected dentures, all the benefits are for the end user, you the customer – the dentures are more accurate and stronger. With the pourable, all the benefits are for the technician producing the denture. Admittedly though, a pourable denture will cost much less than an injected denture so thats a clear benefit to the patients and i think that the future of the pourable denture is going to be with the budget denture like temporaries and NHS dentures. My real fear here though, is the strength of a denture cooked under low temperature and low pressure so we decided to put them to the test, by driving a car over them, just to see how strong they really are.

The Results

I had no idea what would happen if we drove over one of our injected dentures but I have been using our current injector (Ivobase) for about a year now, producing literally hundreds of dentures in this way and the success rate has been phenomenal, incidences of these dentures breaking has been virtually non existent. We tried to make the two dentures as identical as possible but they did differ slightly because we used the two completely different methods and we also used different teeth. we used a much cheaper tooth on the pourable acrylic, a typical tooth that is used widely on NHS dentures because we felt these were more likely to be used on this type of denture. On the injected we used our premium plus range of teeth called Phonars II.

The driving over your dentures with a car test!

You can find out more about or denture service in the Denture section of our website.

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