Using irreversible hydrocolloid to evaluate preparations and fabricate temporary immediate provisional restorations

Tooth Reduction Guide Using Silicone Registration Material Along with Vacuum‐Formed Thermoplastic Matrix

“… Complete the diagnostic waxing to simulate the desired contour and occlusion, then duplicate the wax cast in Type III dental stone (Microstone, Whip Mix Corp, Louisville, KY). Thermoform a clear plastic matrix (Buffalo Dental MFG, Syesset, NY) over the duplicate cast in the conventional manner 5 . Separate the vacuum‐formed thermoplastic matrix from the cast, trim the excess 1 mm beyond the gingiva around the prepared tooth using a surgical blade (carbon steel surgical blade number 25, Miltex Inc., York, PA), and make an air escape hole in the center of the prepared tooth of the matrix using a small round bur (Fig 1A).…”

“…A typical reduction guide is fabricated either of poly vinyl siloxane (PVS) putty impression material 6,7,10 or thermoplastic sheet 5,8,9,11 . The guide is seated in place intraorally, and the clearance for the restoration is evaluated visually and quantified.…”

“…The PVS putty impression material is preferred for intricate prosthodontic procedures because it duplicates and accurately transfers the diagnostic waxing; 6,7,10 however, a silicone putty guide is bulky and not practical for posterior use and requires additional procedures for the fabrication of interim restorations. The guide made of a thermoplastic sheet is easy to use and translucent, which allows visual evaluation as well as measurement of the clearance underneath the matrix through holes or slots made in the matrix 5,8,9,11 . An accurate duplication of the axial/occlusal contours is obtained through pressure vacuum and intimate adaptation of the sheet over the duplicate cast of the diagnostic waxing, although the duplication of the occlusal surface details may be compromised.…”

“…[1][2][3][4] A tooth reduction guide is recommended to help create uniform space for the restoration and prevent an undesirable situation, in particular when the tooth is misaligned, tilted, rotated, or needs significant alterations. [5][6][7][8][9][10][11] As the treatment plan for the fixed restoration is established, an ideal tooth contour is established by means of a diagnostic waxing, including alteration of occlusal vertical dimension and orientation of occlusal plane when needed.…”

Use of Vacuum‐Formed Templates to Guide Tooth Preparation and Insertion of Interim Restorations

“…In the dental literature, various techniques have been described to assess tooth preparations and guide the fabrication of interim restorations 1,2,15–18 . Commonly used procedures include the use of vacuum‐formed shells as indices to assess tooth reduction, followed by impression of tooth preparations and laboratory fabrication of processed interim prostheses.…”