August 1, 2007
by Dr. Don Erickson, Dr. Christopher D. Ramsey, Dr. Bob Margeas
Protemp(tm) Crown Temporization Material from 3M ESPE is the world’s first preformed, malleable temporary crown, providing speed and simplicity in temporization like never before. With this revolutionary light-curable material and time-saving technique, dental professionals can quickly trim and adapt a single-unit composite crown to deliver a strong and aesthetic custom fit in four minutes or less. Indicated for temporary posterior crowns, Protemp(tm) Crown offers precision fit and excellent strength. No impression or matrix is needed, eliminating mess and clean up, while increasing productivity and delivering strong and aesthetic results.
CLINICAL CASE 1
By Dr. Don Erickson
Initial situation: Recurrent decay on the distal surface of tooth No. 20. Due to the fractured buccal cusp and weak unsupported lingual cusp, tooth No. 20 required full crown restoration.
The existing crown was removed and an interim temporary restoration was placed using Protemp(tm) Crown Temporization Material, to be followed by a permanent PFM crown.
Treatment plan: Old amalgam and undercuts were filled in with F2000 Compomer Restorative and the surface was finished with a tapered carbide bur. Protemp(tm) Crown was rolled between gloved fingers for approximately one minute to soften it, and the gingival margin was trimmed to the approximate length of the preparation. Protemp(tm) Crown was placed onto the prepared tooth and shaped to establish a precise fit. The buccal and lingual margins were adapted and occlusal adjustments made. The buccal, lingual and occlusal surfaces were each tack cured for 2-3 seconds. Protemp(tm) Crown was removed and all surfaces of the crown were light-cured outside of the mouth for a total of 60 seconds. The cured crown was fit onto the preparation, finished and polished using a composite polishing disc, and cemented with temporary cement.
CLINICAL CASE 2
By Christopher D. Ramsey
Initial situation: Root canal on fractured tooth No. 21. Patient in poor dental health required emergency restoration. Provided post, core build-up and 3M(tm) ESPE(tm) Protemp(tm) Crown while permanent restoration was fabricated.
Treatment plan: Patient was anesthetized and a non-latex rubber dam was placed. Space for 1.6 mm diameter RelyX(tm) Fiber Post was created using corresponding drill and the post was inserted into canal to check the fit. RelyX(tm) Unicem Self-Adhesive Universal Resin Cement was dispensed into canal using the RelyX(tm) Unicem Aplicap(tm) Elongation Tip. RelyX(tm) Fiber Post was placed in the canal and light-cured for 40 seconds. Filtek(tm) Z250 Universal Restorative was used to create the crown build-up, followed by a 20 second light-cure and trimming of the post. After measuring the mesial-distal width of the preparation, the proper size Protemp(tm) Crown was removed from the package, trimmed and placed onto the prep. The buccal and lingual margins and proximal contacts were adapted. As the patient bit down, occlusal fit was established. Buccal, lingual and occlusal surfaces were each tack cured for 2-3 seconds and the crown was removed. The crown was lined with Filtek(tm) Supreme Plus Flowable Restorative and tack cured. Protemp(tm) Crown was light-cured for 60 seconds and re-seated onto the prep. The margins were finished to obtain a close fit along the gingival margin and occlusal fit re-checked. An impression was taken for the permanent crown and Protemp(tm) Crown was cemented using RelyX(tm) Temp NE Temporary Cement.
CLINICAL CASE 3
By Dr. Bob Margeas
Initial situation: A 19-year-old woman presented with congenitally missing tooth No. 27. An implant was selected as the most fitting method of completing the patient’s smile.
Treatment plan: A titanium implant was placed and allowed to integrate for a period of three months. An implant abutment was placed and a polyvinyl impression made for fabrication of the final Lava(tm) Crown. Measurements were taken to determine the appropriate size Protemp(tm) Crown Temporization Material, and the crown was trimmed to the correct height, following the gingival contour. The crown was placed onto the implant abutment for shaping and adaptation to interproximal contacts. The patient was instructed to gently bite down to establish occlusion and adapt the buccal surface. A composite instrument was used to adapt the buccal margin and adjust the occlusion. The buccal surface was tack cured for two seconds, held in place while the lingual margin was adapted, and lingual and occlusal surfaces tack cured for two seconds. The crown was then removed from the abutment and cured for 30 seconds using the Elipar(tm) Freelight 2 LED Curing Light. The crown was finished using Sof-Lex(tm) Finishing and Polishing Discs and seated with RelyX(tm) Temp NE Temporary Cement.
Dr. Don Erickson, St. Paul, Minnesota. Dr. Christopher D. Ramsey, Jupiter, Florida. Dr. Bob Margeas, Des Moines, Iowa.
Clinical cases provided by 3M.