CAD / CAM systems: from 2D to 3D smile analysis

In dental practice, facial arches allow you to copy the projection of the upper jaw relative to the articular condyles (orientation in the center of rotation). The analysis is carried out in three planes perpendicular to each other. The resulting projections are transferred to the structure of the articulator.

CAD / CAM programs allowed us to bring this technology to a higher level by automating most processes. Firstly ,the “manual” work of a specialist-technician is minimized; secondly, the accuracy and speed of manipulations are increased.

Modern CAD / CAM systems are equipped with a virtual articulator to naturally simulate the trajectory of the lower jaw. Correction by means of adapted numerical values is carried out for the following purposes:

  • Demonstration of the inclination of the articular condyle;
  • Representation of the Bennett angle;
  • occlusion control.

The whole process of using a CAD/CAM system with a CNC can be represented as a set of stages:

  1. Registration of the parameters of the dentofacial analyzer — the rod of the device is aligned along the median facial line, the position of the occlusal plane is copied.
  2. Scanning of the jaws.
  3. Working out the bite block— the result of the scan is compared with the picture of both jaws, after which another scan of the impression of the upper dentition is carried out. The last impression takes into account the position of the middle rod of the KoisDFA device and the Fox plane, so that additional reference points are not needed when positioning models.
  4. Comparison of all models and the obtained bite blocks using the program.
  5. Transferring STL models to specialized software-if the module is integrated to create wax copies of the design, it is transferred to the existing CAD program.

Three-dimensional modeling of a smile has an undeniable advantage: any parameter changes according to the patient’s preferences on a digital model, without the need to work on wax. You can superimpose digital photos and videos with high resolution. In simple words, everything happens easier, faster and better, since the dentist can check the result of the work done “live” before proceeding to the production of final restorations.

CAD / CAM systems in dentistry are a new step on the way to beauty and health. It is possible to visualize and measure the required volume of restoration material from all sides of the teeth in order to accurately assess the reduction of tissue, minimizing iatrogenic intervention.

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