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Journal of Prosthetic Dentistry

Improved digital impressions of edentulous areas

  • Ju-Hyoung Lee
    Correspondence
    Corresponding author: Dr Ju-Hyoung Lee, Catholic University of Daegu School of Medicine, Daegu, REPUBLIC OF KOREA
    Affiliations
    Assistant Professor, Department of Dentistry, Catholic University of Daegu School of Medicine, Daegu, Republic of Korea; and Graduate student, Department of Prosthodontics, School of Dentistry, Kyungpook National University, Daegu, Republic of Korea
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      Intraoral scanners (IOSs) are widely used in the fabrication of fixed dental prostheses, in that their accuracy compares well with traditional impression making.
      • Chochlidakis K.M.
      • Papaspyridakos P.
      • Geminiani A.
      • Chen C.J.
      • Feng I.J.
      • Ercoli C.
      Digital versus conventional impressions for fixed prosthodontics: a systematic review and meta-analysis.
      Recently, IOSs have been successfully used in the fabrication of removable dental prostheses.
      • Kattadiyil M.T.
      • Mursic Z.
      • AlRumaih H.
      • Goodacre C.J.
      Intraoral scanning of hard and soft tissues for partial removable dental prosthesis fabrication.
      • Lin W.S.
      • Chou J.C.
      • Metz M.J.
      • Harris B.T.
      • Morton D.
      Use of intraoral digital scanning for a CAD/CAM-fabricated milled bar and superstructure framework for an implant-supported, removable complete dental prosthesis.
      • Londono J.
      • Abreu A.
      • Baker P.S.
      • Furness A.R.
      Fabrication of a definitive obturator from a 3D cast with a chairside digital scanner for a patient with severe gag reflex: a clinical report.
      • Mansour M.
      • Sanchez E.
      • Machado C.
      The use of digital impressions to fabricate tooth-supported partial removable dental prostheses: a clinical report.
      Digital impressions are useful for patients with a gag reflex and sensitivity to impression materials.
      • Kattadiyil M.T.
      • Mursic Z.
      • AlRumaih H.
      • Goodacre C.J.
      Intraoral scanning of hard and soft tissues for partial removable dental prosthesis fabrication.
      • Lin W.S.
      • Chou J.C.
      • Metz M.J.
      • Harris B.T.
      • Morton D.
      Use of intraoral digital scanning for a CAD/CAM-fabricated milled bar and superstructure framework for an implant-supported, removable complete dental prosthesis.
      • Londono J.
      • Abreu A.
      • Baker P.S.
      • Furness A.R.
      Fabrication of a definitive obturator from a 3D cast with a chairside digital scanner for a patient with severe gag reflex: a clinical report.
      Moreover, IOSs can register excessively movable tissue in a passive state to achieve a mucostatic impression.
      • Kattadiyil M.T.
      • Mursic Z.
      • AlRumaih H.
      • Goodacre C.J.
      Intraoral scanning of hard and soft tissues for partial removable dental prosthesis fabrication.
      • Lin W.S.
      • Chou J.C.
      • Metz M.J.
      • Harris B.T.
      • Morton D.
      Use of intraoral digital scanning for a CAD/CAM-fabricated milled bar and superstructure framework for an implant-supported, removable complete dental prosthesis.
      • Page H.L.
      Mucostatics.
      • Bindhoo Y.A.
      • Thirumurthy V.R.
      • Kurien A.
      Complete mucostatic impression: a new attempt.
      However, scanning edentulous area with IOSs may be difficult and time-consuming, because edentulous sites are smooth and devoid of features.
      • Patzelt S.B.
      • Vonau S.
      • Stampf S.
      • Att W.
      Assessing the feasibility and accuracy of digitizing edentulous jaws.
      The stitching process may be faulty, especially in the palatal area.
      • Patzelt S.B.
      • Vonau S.
      • Stampf S.
      • Att W.
      Assessing the feasibility and accuracy of digitizing edentulous jaws.
      This article introduces a time-saving technique that easily captures tissues, prevents incorrect data processing, and uses common and inexpensive materials.

      Procedure

      • 1.
        Mix pressure-indicating paste (Pressure Indicator Paste; Mizzy Inc) and interim zinc oxide-eugenol cement (Temp-Bond; Kerr Corp).
        • Kaku T.
        • Ogino Y.
        • Matsushita Y.
        • Koyano K.
        Technique for identifying keratinized gingival tissue and soft tissue morphology on 3-dimensional implant-planning software images.
      • 2.
        While retracting the vestibules (Fig. 1), dry the edentulous area and draw irregular shapes on the residual ridges with the mixture and the dental microapplicator (Microbrush; Microbrush Intl). Connect the shapes with lines toward the center of the palate (Fig. 2).
        Figure thumbnail gr1
        Figure 1Occlusal view of maxillary arch with anterior movable tissue.
        Figure thumbnail gr2
        Figure 2Irregular shapes and lines drawn with mixture of pressure-indicating paste and zinc oxide-eugenol cement.
      • 3.
        Scan the edentulous area with the IOS (TRIOS Color Pod; 3Shape Inc) (Fig. 3). If incorrect stitching is noted, rescan from the drawn area to the inaccurately stitched area. After the scan procedure, soak a piece of gauze in the removal liquid (PIP Remover; Mizzy Inc) and clean the edentulous area with it.
        Figure thumbnail gr3
        Figure 3Software view of mucostatic impression of maxillary arch.

      Acknowledgments

      The author thanks Hye-Jung Yun for technical assistance.

      References

        • Chochlidakis K.M.
        • Papaspyridakos P.
        • Geminiani A.
        • Chen C.J.
        • Feng I.J.
        • Ercoli C.
        Digital versus conventional impressions for fixed prosthodontics: a systematic review and meta-analysis.
        J Prosthet Dent. 2016; 116: 184-190
        • Kattadiyil M.T.
        • Mursic Z.
        • AlRumaih H.
        • Goodacre C.J.
        Intraoral scanning of hard and soft tissues for partial removable dental prosthesis fabrication.
        J Prosthet Dent. 2014; 112: 444-448
        • Lin W.S.
        • Chou J.C.
        • Metz M.J.
        • Harris B.T.
        • Morton D.
        Use of intraoral digital scanning for a CAD/CAM-fabricated milled bar and superstructure framework for an implant-supported, removable complete dental prosthesis.
        J Prosthet Dent. 2015; 113: 509-515
        • Londono J.
        • Abreu A.
        • Baker P.S.
        • Furness A.R.
        Fabrication of a definitive obturator from a 3D cast with a chairside digital scanner for a patient with severe gag reflex: a clinical report.
        J Prosthet Dent. 2015; 114: 735-738
        • Mansour M.
        • Sanchez E.
        • Machado C.
        The use of digital impressions to fabricate tooth-supported partial removable dental prostheses: a clinical report.
        J Prosthodont. 2016; 25: 495-497
        • Page H.L.
        Mucostatics.
        Ticonium Contacts. 1946; 4: 7
        • Bindhoo Y.A.
        • Thirumurthy V.R.
        • Kurien A.
        Complete mucostatic impression: a new attempt.
        J Prosthodont. 2012; 21: 209-214
        • Patzelt S.B.
        • Vonau S.
        • Stampf S.
        • Att W.
        Assessing the feasibility and accuracy of digitizing edentulous jaws.
        J Am Dent Assoc. 2013; 114: 914-920
        • Kaku T.
        • Ogino Y.
        • Matsushita Y.
        • Koyano K.
        Technique for identifying keratinized gingival tissue and soft tissue morphology on 3-dimensional implant-planning software images.
        J Prosthet Dent. 2016; 116: 21-24