ACADEMICS zyxw AND EDUCATION Verifying the Reliability of Interchan ing Casts Between Hanau Modu ii ar Articulators zy Robert zyxwvut A. Sanchez, ODs,* Domy zyxwv J. Moore, ODs,? Robert D. Cowan, DDS, MS,$ and Paulette Spencer, DDS, MS, PhDs zyxw Purpose: zyxwvutsrq The purpose of this study was to test the Hanau Modular Articulator system with Materials and Methods: Eight Hanau Modular Articulators were tested using the same measur- Results: It was determined that the Hanau Modular System with programmed fossae did Conclusions: Laboratory procedures for multiple restorations can be accomplished with accu- J Prosthod 2:220-223. Copyright o 1993 by the American College zyxwv of Prosthodontists. INDEX WORDS: articulator discrepancies, clinical accuracy, measuring devices programmed fossae to determine its interchangeability. ing system as previously developed in a similar investigation on a different instrument. possess accuracy when a measuring device was transferred between the eight articulators tested. racy when master casts and mountings are transferred between Hanau Modular Articulators. HE USE OF semiadjustable articulators by T recent graduates in private practice is on the increase. The majority of dental schools in the country (92%) now uses semiadjustable instruments in their curriculae.' Because a semiadjustable articu- lator is sufficient for treating the majority ofpatients requiring oral rehahilitation,*-* the instrument must accommodate construction procedures for many pa- tients in order to alleviate the financial burden encountered by the purchase of multiple articulators. An interchangeable instrument partially solves this problem. With such an articulator there would no longer be the need to send the instrument to the laboratory with the mounted cast attached. Inter- changeability would allow the cast alone to be sent along with the articulator settings, provided the laboratory has the same model of semiadjustable articu1ator.j This study was conducted to evaluate the accuracy of the cross-mounting capability of the Hanau Modu- From the L'niuenity af~~fis.roun-Kanrai C@y, School q'Dentizty. *Assistant Pr+$asor, Department +$Remouable ProJthodontkx fH.B.G. Robinson zyxwvutsrqponm Pr@sor and Chairman q'Rmo~~able Pmcthudmticr. ~Amtant Prqfissor, Director zyxwvutsrqpo of zyxwvutsrq Advanced Education in General Den- gthsiitant B&cror, Depmhents of Ohal Biology and Pedktric Den- tisty Correspondem to: Dr. Dmy J. Moore, Uniuersip of Micsor~ri-Kanrev Cig, School ofDentisty, 650East 25th St, Kansas Cib, MO 64108. CoppiEht 0 1993 !y the Amhcan Collqe OfProJthodontists Io~Y-Y41xi~~/o2w-ooo~~~.o~lo tisty. lar Articulator System. The Modular Articulator is equipped with programmed fossae, adjustable incisal guides, dual-end incisal pins, a fixed intercondylar width of 110 mm, condylar track locks that may be adjusted to a closed position to prevent separation of the upper and lower members, and adjustable condy- lar inclinations. Materials and Methods Eight new Hanau Modular System articulators were tested. One articulator was arbitrarily selected as a master and compared with the other seven. The condylar eminence of all the articulators were preset to O", and the superior and inferior members were made paratlel to one another. The measuring devicc was the same as previously used in an earlier project in which the Whip Mix model 2240 articulator was tested.* This apparatus is composed of three styli made from machine screws milled to a fine point. These styli were attached to a flat aluminum plate using lock washers and nuts, making them adjustable in the vertical plane. The styli were then positioned to siniulate p i n t contacts at the maxillary right and left first molar mesiolingual cusp tips and at the contact area between the maxillary central incisors (Fig 1). Styli posi- tions were numbered to facilitate recording of the data. These were teeth no. 3 (right first molar), 7-8 (between the central incisors) and no. 14 (left firsr molar). A small modification was made to accommodate affixing the mea- suring apparatus to the Hanau mounting plates. The position of the screws holding the apparatus to the mount- ing plate was changed to accept the Hanau mounting plate. 220 Journal tfl'roxthodontics, 6'01 2, No 4 (Decemb,, 1993:pp 220-223