Advantages And Disadvantages Of CAD/CAM Technology

Several advantages to the patient and the dental practitionar are offered

– The clinical chair time is reduced considerably; all clinical data needed are recorded in the same appointment.
– The digital data for each case is saved; a spare denture or a radiographic or surgical template can be made rapidly.
– Because the digital data are associated with a specific practitioner, patients will return to the same dentist when future treatment is needed.
– Because the denture base is fabricated by machining, polymerization shrinkage of the resin is eliminated, and the fit of the denture base is superior to that of conventionally denture bases.
– Due to the method of processing the acrylic resin for denture bases at fifty times the conventional processing pressure, there is less porosity, and denture base material may have less C. Albicans adherence.

Fewer disadvantages are present

– The artificial teeth and denture base are equipped with different colors and properties. The artificial teeth need high abrasion resistance and an aesthetic appearance. It is difficult to cut the artificial teeth from a single property block. Thus, only the denture base is fabricated by cutting then commercially available artificial teeth are adhered to the denture base. Special adhesives with higher adhesive properties are being developed.

– Another disadvantage is the missed trial insertion appointment. This step allows making judgments of esthetics and pronunciation and verification of jaw relationship records, including orientation of the occlusal plane, vertical dimension, tongue space, tooth positioning, palatal seal and soft tissue support for proper external form. This is why a third appointment in the advanced fabrication technique could be added. AvaDent Advanced Try-In (ATI) uses the final base with teeth waxed on. This technique provides teeth adjustment, relining, VDO modification, full adjustment capabilities. The only problem is the additive cost. Dentca Try-In is a Stereo Lithographic Analog (SLA) of the digitally designed denture that fits like the final denture with a close final contours and the possibility of checking the midline, the insical plane and the lip support. The problem is the frosty clear appearance of teeth that cause difficulties to evaluate shade and esthetics, plus the fact that we cannot move the teeth.

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