Thank you @Strawman for organising today's chat with SDI. I wasn't able to listen live but have listened back to the recording. Just thought I'd write down some thoughts coming from Dentist's perspective. I have done another forum post a while back in regards to what I thought about their products which I will link here.

SDI are at an interesting transitional period in which there is increasing phasing out of amalgam fillings and the shift towards more aesthetically pleasing dental materials. This has hurt SDI as they were the largest manufacturer of amalgam capsules in the southern hemisphere and I believe amalgam sales still make up a very large part of their revenue mix. With the transition towards aesthetic materials, more competitors have arisen and Samantha outlined them briefly towards the end of the meeting in particular 3M which is the 1000 pound gorilla of the industry.

However, no company has been able to create a direct dental material (materials that are placed directly onto the tooth as opposed to lab made) that has been able to replicate the strength of amalgam to this day. Composite Resin's are the closest comparison however they suffer from reduced strength especially compressive strength and they are also very technique sensitive; they must be placed with next to 0 exposure to moisture. If you've been to the dentist recently you have been been subjected to a dental dam. This is placed to reduce the amount of moisture that comes into contact during placing of the filling. Amalgam's did not have this issue. They were strong and could withstand high levels of force, and they were not moisture sensitive. The drawback was that they were silver in colour making them unaesthetic and also over time, it was found that amalgams would expand ever so slightly thus causing subtle cracks to adjacent tooth structure.

I believe that SDI poured an enormous amount of R&D into developing Glass Ionomer Cements (GIC) in the late 90s and early 2000s as it was seen as a potential replacement for amalgam at the time. GICs are known to have aesthetic properties, ease of use in which they were moisture tolerant, and they also chemically adhered to the tooth thus making them "stronger" in adhesion to the tooth. This may explain the massive run up in share price between 2000-2004. Unfortunately, with increased research and use of GIC's, it was found that they had very poor wear capabilities and were also not acid resistant. The chemical bond strength was also poor compared to the bond between adhesive and composite resin. And thus their use case in recent times has mainly been as a temporary filling material. This may also explain why there are only 2 main competitors in the GIC range compared to over 200+ just in the composite market in the US alone.

Their new product "Stela" which Samantha showed to us in the meeting is being marketed as an amalgam replacement. There doesn't seem to be much marketing or information yet on the Australian website however on the Central and South American website I have found this information (I have used google translate to translate back to English):

My first thoughts on this product just looking at this information are:

• If this product is an alterative to amalgam, why wouldn't you compare the strength of it to an amalgam material (the comparison materials are GIC (Equia Fort) and other composite resin materials)?
• The material is chemically cured but takes 4 minutes, where as I could use Filtek Bulk Fill (a composite resin material) which only takes 20-30s to set with a curing light?
• How technique sensitive is the material going to be? Will it be less moisture sensitive than composite resin?
• Is the material going to expand over time as has been discovered with amalgams?

Obviously the material hasn't launched yet so more information will be released but these are just my initial thoughts. Will be interesting to see the take-rate of this material in the dental surgeries. Dentists, much like doctors, are quite stubborn and don't like change. They will need to market this well in order for it to sell.

Disc: Not held.