Dental Tribune U.S. Edition

Dental Tribune U.S. Edition | April 2012 A27 Ad Advances in dental implant impressions By Gregori M. Kurtzman, DDS, MAGD, FACD, FPFA, FADI, DICOI, DADIA The Miratray Implant Advanced Tray simplifies the process of taking open tray implant impressions. The tray is provided in three maxillary and three mandibular sizedtrays,andthetraysareuniqueintheir design. The occlusal surface is covered by a transparent foil. This allows easy identifi- cation of the heads of the pins intraorally. Retention slots and an internal rim provide mechanical retention to keep impression materialinthetray.Shouldthepractitioner choose to supplement the retention with a PVS adhesive, it is recommended that it not be applied to the foil surface because this mayobscurevisualizationofthepinswhen inserting the tray to proper depth. The technique involves filling the tray with an appropriate impression material. The tray is then inserted over the open tray impression heads intraorally and pressed down crestally until the top of the impres- sion pins are visible through the transpar- ent foil. The practitioner then presses the tray further until the pins puncture the foil and are visible protruding through the foil. This contains the impression material within the tray without the potential prob- lemoftenseenwithuseofcustomormodi- fied stock trays of the impression material obscuring the tops of the pins. Upon setting, the pins are rotated in a counterclockwise fashion and removed from the impression, and the impression is removed intraorally. Because of the de- sign of the tray, it can be used in all implant impression situations, whether the arch is partially dentate or fully edentulous. Case example Patient presented ready for prosthetic phase of a single implant in the maxillary second premolar and an adjacent crown on a natural molar. The treatment plan would restore the implant at the second molar with a custom abutment and restore the site with a cemented bridge with a canti- lever pontic at the first premolar. Follow- ing preparation of the molar, an open tray impression abutment was placed on the implant fixture. TheMiratraywastestedintoverifyitwas large enough to capture all of the teeth in the arch without impingement on teeth or soft tissue. An impression material was injected around the gingival aspect of the open tray impression abutment and the sulcus of the molar preparation. The Mira- tray was filled with additional impression Miratray Implant Advanced Tray with patented foil technique. Photo/Provided by Hager Worldwide material and inserted intraorally. As the tray was pressed gingivally, the long pin was allowed to perforate the clear foil on the occlusal aspect of the Miratray. Upon setting, the long pin was removed, and the Miratray impression was removed intraorallyandsenttothelabforprosthetic fabrication. A master cast was created from the impression and the prosthetics were completed and returned for insertion. iNdustry NEWs CDA BOOTH NO. 1674 GREGORI M. KuRTZMAn, DDS, MAGD, FACD, FPFA, FADI, DICOI, DADIA, is in private general practice in Silver Spring, Md., and is a former assistant clinical professor in endodontics, prosthetics and operative dentistry at the University of Maryland. He has lec- tured nationally and internationally on restorative dentistry; endodontics and implant surgery and prosthetics; removable and fixed prosthetics; and periodontics. He has more than 200 published arti- cles and is on the editorial board of numerous den- tal publications. Kurtzman also consults for multi- ple dental companies, is a former assistant program director for a university-based implant maxi-course and has earned fellowship in the AGD, AAIP, ACD, ICOI, Pierre Fauchard Academy and the Academy of Dentistry International (ADI). He has mastership status in the AGD and ICOI and diplomat status in the ICOI and American Dental Implant Association (ADIA). Kurtzman has been included in the “Top Leaders in Continuing Education” by Dentistry To- day annually since 2006. He can be contacted at dr_kurtzman@maryland-implants.com. ˙ References 1. Samet N, Shofat M, Livny A, Weiss EI. A clin- ical evaluation of fixed partial denture im- pressions. J Prosthet Dent 2005; 94:112–117. 2. Silverstein LH, Kurtzman GM, et al.: The uti- lization of a preprosthetic extraoral verifi- cation stent for dental implant-supported reconstructions. Dent Today. 2002 Jan;21(1):88–91. 3. Kwon JH, Son YH, Han CH, Kim S.: Accuracy of implant impressions without impression copings: a three-dimensional analysis. J Prosthet Dent. 2011 Jun;105(6):367–73.