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Tips from Our Readers| Volume 121, ISSUE 1, P185-186, January 2019

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Functionally generated path technique to fabricate a crown in group function on a deciduous maxillary canine

Published:July 10, 2018DOI:https://doi.org/10.1016/j.prosdent.2018.01.023
Functionally generated path technique to fabricate a crown in group function on a deciduous maxillary canine
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      The accurate fabrication of a restoration in group function is challenging because an articulator cannot accurately simulate the simultaneous dental contacts during all eccentric mandibular movements.
      • Hobo S.
      • Shillingburg Jr., H.T.
      • Whitsett L.D.
      Articulator selection for restorative dentistry.
      J Prosthet Dent. 1976; 36: 35-43
      However, group function was indicated for the restoration of a maxillary deciduous canine in a 45-year-old patient in which the lateral incisor and the first premolar provided mandibular guidance. Canine guidance alone was contraindicated because of the minimal support offered by the deciduous canine (Fig. 1). Cone beam computed tomography indicated that the included canine did not affect the lateral incisor.
      Figure thumbnail gr1
      Figure 1Deciduous maxillary canine in working excursion.
      A functionally generated path (FGP) record as described by Meyer
      • Meyer S.F.
      The generated path technique in reconstruction dentistry: Part II. Fixed partial dentures.
      J Prosthet Dent. 1959; 9: 432-440
      and DuVall and Rogers
      • DuVall N.B.
      • Rogers P.M.
      Application of the functionally generated path technique to restore mandibular molars in bilateral group function occlusion.
      J Prosthodont. 2013; 22: 226-232
      was used to replicate the mandibular functional excursions guided by the teeth adjacent to the prepared tooth.

      Procedure

      • 1.
        Provide a conservative complete crown preparation for the maxillary deciduous canine.
      • 2.
        Make maxillary (Impregum Penta Soft; 3M ESPE) and mandibular (Hydrogum 5; Zhermack) impressions.
      • 3.
        Record the occlusion in maximum intercuspal position (Dental Wax; Moyco Union Broach).
      • 4.
        Adapt a rigid resin support (Unifast TRAD; GC) to the prepared tooth.
      • 5.
        Add soft wax (Cire molle ESVÉ; Prodont-Holliger) to the resin support.
      • 6.
        Record all eccentric mandibular excursions in the soft wax. Ensure occlusal contact is maintained during the movements (Fig. 2).
        Figure thumbnail gr2
        Figure 2Functionally generated path wax recording in working excursion.
      • 7.
        Adapt quick-setting plaster (Snow White Plaster; Kerr Corp) to the wax record as well as the occlusal surfaces of the adjacent teeth (Fig. 3).
        Figure thumbnail gr3
        Figure 3Quick-setting plaster adapted to wax record and occlusal surfaces of adjacent teeth.
      • 8.
        In the laboratory, mount the definitive cast to both the anatomic mandibular cast and the FGP cast on an articulator (SAM 2P; SAM Präzisionstechnik) (Fig. 4).
        Figure thumbnail gr4
        Figure 4Definitive cast articulated with functionally generated path cast.
      • 9.
        Make the crown with the FGP cast in direct contact with the area where group function is to be developed.
      • 10.
        Evaluate and cement the crown, ensuring the accuracy of the static and dynamic occlusal contact relationships (Fig. 5).
        Figure thumbnail gr5
        Figure 5Definitive restoration on deciduous maxillary canine. A, In working movement. B, Radiograph.

      References

        • Hobo S.
        • Shillingburg Jr., H.T.
        • Whitsett L.D.
        Articulator selection for restorative dentistry.
        J Prosthet Dent. 1976; 36: 35-43
        View in Article
        • Meyer S.F.
        The generated path technique in reconstruction dentistry: Part II. Fixed partial dentures.
        J Prosthet Dent. 1959; 9: 432-440
        View in Article
        • DuVall N.B.
        • Rogers P.M.
        Application of the functionally generated path technique to restore mandibular molars in bilateral group function occlusion.
        J Prosthodont. 2013; 22: 226-232
        View in Article

      Article info

      Publication history

      Published online: July 10, 2018

      Identification

      DOI: https://doi.org/10.1016/j.prosdent.2018.01.023

      Copyright

      © 2018 by the Editorial Council for The Journal of Prosthetic Dentistry.

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