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Prof. Sandhaus

Professor Sami Sandhaus

Associated Professor of the Stomatology Institute,

Pierre and Marie Curie University, Paris Ⅵ

Member of the French Academy for Dental Surgery

Member of the Center for Restorative Dentistry (USA)

Member of honour of the Academy of Romanian Scientists

Forum Odontologicum

Avenue de Provence 4

Course Ⅲ - Tridimensional Occlusion - N.O.R.:

A new method

Myths and Realities of Occlusion: N.O.R., a new method by Professor Sandhaus.

The key to the success of restorative dentistry, which harmoniously integrates itself into the patient's functional system, resides in the exact reproduction of the physiological occlusion.

The recording of occlusion is highly simplified by the use of N.O.R., the Natural Oral Relator. This method consists in seizing the mandible movements made freely by the patient. The N.O.R. system allows avoiding the mistakes made by other classical methods, such as the recording achieved in vertical position (D.V.O.). This one, because of the wax and resin input, distorts the real position of the condyle in its glenoid fossa, by suppressing the influence of the proprioceptive signals generating the mandibular deviations.

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The device allows:

  • To reproduce exactly the occlusion osseomuscular process, by taking into account its cranio-mandibular repercussions (cranio-mandibular interaction)
  • To obtain a physiological identity of the mandible with the skull and its supporting system (the atlas and pre-/post-vertebral balance)
  • To obtain, for each particular case, an exact record of the various functional movements of the mandible and of the sliding in the glenoid fossas.

Simple, stable, precise, polyvalent, the recording device of the tridimensional cybernetic system is at the service of a new concept, complying with the physiology of mastication.

Due to its particular structure, the N.O.R. is the first device being able to reproduce the opening and closing movements recorded beforehand by the bi-pantographic system.

The N.O.R. articulator allows the independent variation of the Benett and Shift angles.

The method is based on the following rules:

At first, choice of the "Hinge terminal" position (mandible backward, in Rk).

Tridimensional reproduction of the mandible movements in the N.O.R. articulator.


  • The Bennett and Shift angles can be reproduced in the three dimensions.
  • The recording and the reproduction by means of the N.O.R. articulator are visually monitorable at any time.
  • It saves a considerable amount of time in the office and in the laboratory.
  • The method is well tolerated by patients, as the recording takes only 12 to 15 minutes.
  • Respect of the masticatory dynamics


Practical work:

  1. Monoblock impression (bimaxillary)
  2. Execution of bi-pantographic keys for the recording
  3. Recording
  4. Execution of the grounding into the positioning device
  5. Placement in the N.O.R. articulator
  6. Use of the tridimensional recording on completely edentulous patients
  7. Identification of potential temporomandibular pathologies
  8. Differential diagnosis
  9. Handling of the articulator

Participants to the seminary will bring two casts: upper and lower maxillary. At the end of the course, they will have the possibility to put into practice the N.O.R. tridimensional recording method themselves. Demonstration is more eloquent than all theories.

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