Weinberg noted that, as the OP is elevated, the condylar guidance decreases and when the OP is lowered, the horizontal condylar guidance (HCG) increases.

An inaccurate reproduction of steepness of the OP can significantly affect function and esthetics and possibly result in an unstable prosthesis. Many clinicians have stated that the appropriate selection of an anterior point of reference on the FHP is vital in prosthetic procedures for esthetic reasons and also for establishing a correct OP. Wilkie stated that the use of the anterior reference points must be well coordinated in order to avoid inadvertent changes in the sagittal inclination of occlusal plane (SIOP). Manufacturers of Hanau articulators have claimed that these grooves can be used as arbitrary vertical landmarks for orientation of the incisal edge of the maxillary centrals while making a facebow transfer. The 54 mm groove is based on the research by Frank R. The 37 mm groove is based on part on the Bonwil Triangle and results in a horizontal appearing OP. Hanau Wide-Vue (WV) and Hanau H2 (H2) articulators have superior (37 mm) and inferior (54 mm) annular grooves on the incisal guide pin below the Frankfort Horizontal Plane (FHP). When the Frankfort plane is parallel to the floor, a facebow provides the effect of orienting the occlusal plane (OP) to the opening axis of an articulator in the same way that it is viewed in the mouth. This transfer is made with a facebow using two posterior reference points and an anterior reference point to accurately position a maxillary cast on an articulator. The transfer of three-dimensional spatial relationship of the maxillary arch to the cranial structures, and the mandible to the arc of opening, is then simulated on an articulator. In order to obtain a successful dental restoration, an accurate transfer of records from the patient to the articulator should be made. However, contrary reports exist regarding the supremacy of arcon over nonarcon articulators.

Weinberg believed that both the articulators generate similar movements and that arcon articulator has no clinical advantage over nonarcon. It is believed that an arcon articulator can reproduce more precise mandibular movements than nonarcon to achieve a harmonious occlusion. It can be classified as arcon and nonarcon type based on the location of articulating fossa and condyles. A semi-adjustable articulator is a device that allows adjustments to simulate average mandibular movements.

Hanau spring bow manual