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Sescoi is to demonstrate the manufacturing process for dental crowns, bridges, custom abutments and model building with partner companies Dental Wings and 360SDM at Dentech China 2009, Shanghai.

The DWOS design modules are Dental Wings’ software solutions for designing dental restorations and are integrated with the Sescoi WorkNC solution for ease of use.

The process starts with an impression scanned by one of Dental Wings’ non-contact 3D laser scanners: iSeries (impression scanner) or 5Series (flagship high productivity scanner).

The scan data is then used to generate a digital model from the impression with the DWOS Virtual Model Design software (DWOS-VMD).

The virtual model is then used in DWOS design modules to generate the desired prosthesis design.

The completed design and digital model are then ready for programming in Sescoi’s WorkNC Dental automatic CAM software that is integrated into the DWOS-CAM module.

The process is completed by machining the completed restorations and their model in four- or five-axis on 360SDM’s EZ-Mill400 and EZ-Mill500 laboratory milling machines.

Scans and designs generated from Dental Wings allow the technician to accurately capture the clinical information.

The DWOS software includes: anatomy and framework design (with anatomy overpress on copings), customisable anatomy libraries, telescopic unit design, custom abutment design with automatic coping and crown generation and virtual model generation from scanned data.

The scanning technologies include: 5 and 3 Series model scanning from single to full arch with multi-die scan and design capabilities (5 Series up to 16 dies, the 3 Series up to six dies) and the iSeries impression scanner for silicon or alginate-based impressions.

WorkNC Dental takes the finished designs or models and automatically nests them into the blank disc to maximise utilisation of the materials used in dentistry and minimise waste.

Auto-generated support pins locate the crown or bridge for machining.

Automatic cutting wizards are then applied that rough, semi finish and finish the prosthesis.

Each material type, such as zirconia, titanium or chrome cobalt, has its own specific automatic machining wizard, optimised to produce the ideal cutting conditions.

In the case of zirconia, the software is able to allow for shrinkage in the baking process.

For chrome cobalt, five-axis high-speed machining techniques enable very short tools to be used while the smooth cutting strategies produce a high-quality finish and low tool loads.

WorkNC Dental has the ability to rapidly and simply identify and define the margin line where accurate fitting to the gum profile is important for dental hygiene.

It can automatically recognise the orientation of holes on abutments for automatic drilling.

WorkNC Dental is fully automatic, its orientation and nesting tools combine with the machining wizards to make a system that is unique in its simplicity of operation, enabling users to produce reliable, collision-free programs in minutes.

High-speed machining on the 360SDM machines completes the process, resulting in the production of high-quality, accurate prostheses in the shortest possible time.

The five-axis machining capability enables undercuts to be machined and consideration of the physical limits of the machine by the WorkNC Dental software guarantees parts are produced right first time.

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