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21 St Mary's St, Malmesbury
01666 822220
[email protected]

With the 3M True Definition intraoral scanner we can take highly accurate, digital impressions of your teeth...
Picture1Barley Mow is still unusual to be using this cutting edge digital technology to make our crowns, veneers and bridges and provide orthodontic treatment.

The new model we recently purchased allows us to:
* scan all your teeth to create 3D models for orthodontic, crown and bridge purposes.
* scan your teeth and construct very accurate dentures.
* scan teeth that have had orthodontic treatment and produce very accurate retainers at any time, on demand.
* scan teeth that are worn or damaged by acid erosion and monitor ongoing wear.

Today there is an increasing number of digital dental scanners on the market as the digital revolution moves on in dentistry.

The 3M True Definition Intra Oral Scanner is an updated version of the scanner we had previously. It has  3 video cameras operating simultaneously on 3 different axes recording the surfaces of the teeth at 20fps. The system is able to build a 3D model of the teeth accurate to microns in a few minutes. The STL is then transferred into the cloud and can then be downloaded by a laboratory or printed in Germany where a physical model of the teeth is built using stereolithography (SLA).

Stereolithography is an additive manufacturing process using a vat of liquid UV-curable photopolymer "resin" and a UV laser to build parts a layer at a time. On each layer, the laser beam traces a cross-section pattern on the surface of the liquid resin. Exposure to the UV laser light sets the resin and so the model is slowly built up, layer by layer.

After a pattern has been traced, the SLA's elevator platform descends by a single layer thickness, typically 0.05 mm to 0.15 mm (0.002" to 0.006"). Then, a resin-filled blade sweeps across the part cross-section, re-coating it with fresh material. On this new liquid surface, the subsequent layer pattern is traced, adhering to the previous layer. A complete 3-D part is formed by this process. After building, parts are cleaned of excess resin by immersion in a chemical bath and then cured in a UV oven.

The models are then airfreighted to our laboratory in Thornbury, CBC, who may have already designed and milled any CAD-CAM components. They also have a laser sintering device that can create metal components in a similar process to the model construction above. In either case, the True-Def scanner enables the most accurate models to be made, ensuring your crown, bridge, inlay or onlay will fit like a glove when it comes to the fit appointment.

As dentists we are seeing crowns that fit perfectly first time, with little need for adjustments in the vast majority of cases. This must improve the survival and longevity of the tooth you have invested in compared to conventional impressions and crowns.

For our orthodontic applications the appliances and aligners usually fit well the first time and every time, making treatment more predictable


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