Dental Technique A predictable all-digital workflow to retrofit a crown to an existing removable prosthesis

I can routinely retrofit an RPD using digital scans. What was once a difficult task is now simple MJ 

The Journal of Prosthetic Dentistry

Available online 5 January 2019

The Journal of Prosthetic Dentistry


The task of fabricating a new crown under an existing removable partial denture presents challenges for the dentist, technician, and patient. The main concern is accurately communicating the configuration of the rest, retentive clasps, and reciprocal elements to the laboratory technician without temporarily depriving the patient of the prosthesis. A variety of solutions involving stone cast alterations and elastomeric or resin indexes have been used for this task. However, these methods require significant additional time and technique-sensitive work by the operator and technician. More recent approaches using digital technologies require many of these traditional steps, each of which introduces potential inaccuracy and labor cost. This updated approach eliminates the inaccuracies associated with manual manipulation by the technician by leveraging contemporary intraoral scanning technology and a completely digital workflow to predictably and accurately fabricate a crown under an existing prosthesis.
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The Journal of Prosthetic Dentistry Research and Education Influence of interim cements on the optical properties of interim restorations

The Journal of Prosthetic Dentistry

The Journal of Prosthetic Dentistry


Statement of problem

Even if the appropriate resin shade is selected for an interim restoration, how the optical characteristics of the interim cement affect the esthetics of the interim restoration is unclear.


The purpose of this in vitro study was to evaluate the effects of interim cements on the optical properties of interim restorations.

Material and methods

Twenty dentin disks (6×1 mm) were obtained from the labial surface of bovine incisors. Disks of acrylic and bis-acrylic resins (n=20) with the same dimensions were prepared and cemented over the dentin using the following cements: Bifix Temp (resin-based; VOCO), ClearTemp LC (resin-based; Ultradent Products, Inc), Provicol (VOCO), TempCem NE (Coltène). The same dentin and resin disks were used for all cements. After cementation, the color difference (ΔE00), translucency parameter (TP), and fluorescence of the dentin/cement/resin combinations were compared with each other and with a control group (C), in which a transparent liquid (polyethylene glycol 400; LabSynth) was applied. Color and translucency were evaluated with a spectrophotometer (CM-2600; Konica Minolta) and fluorescence with a spectrofluorophotometer (RF-5301PC; Shimadzu). ΔE00 and TP data were analyzed using 2-way ANOVA. For fluorescence, 1-way ANOVA was used. The Tukey test was used for multiple comparisons (α=.05).


ΔE00 values were significantly influenced by the interim material (P<.001) and the interim cement (P<.001). Bifix Temp showed the lowest significant ΔE00 values (P<.001). The highest ΔE00 values were observed for TempCem NE. No differences were observed between the interim resins with respect to TP (P=.318). The lowest translucency values were measured for TempCem NE, followed by Provicol, ClearTemp LC, Bifix Temp, and the control group (P<.001), with no significant differences among the interim resin-based cements. Among the cements, Bifix Temp and TempCem NE yielded fluorescence similar to that of the natural tooth for both interim resins. A similar result was found for bis-acrylic resin combined with Provicol.


Cementation with interim resin-based cements resulted in better esthetics. However, the high fluorescence of the ClearTemp LC may reduce the esthetics of interim restorations in environments with predominantly UV light.
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Kettenbach LP Acquires Airway Metrics, LLC

Huntington Beach, CA—January 15, 2019—Management from Kettenbach LP and Airway Metrics LLC announced today the acquisition by Kettenbach LP of all business assets of Airway Metrics effective end of business February 28, 2019.
Airway Metrics LLC has provided an effective product system to assist dentists in determining the correct vertical and protrusive dimensions needed in a bite to produce an optimum airway to manage OSA through dental professionally prescribed and delivered oral sleep appliances.
Supported by a large number of experts in the field of Dental Sleep Medicine, Airway Metrics has become an essential instrument in a fast growing number of offices adding this therapy to their practices.
The current business will transition during the next 30 days with Airway Metrics conducting all transactions and support. 
All current business agreements and relationships will continue as they were under Airway Metrics leadership.  Airway Metrics is best reached at (206) 949-8839 or
Kettenbach will assume all business responsibilities effective on March 1, 2019.  Kettenbach can best be reached at 877.532.2123 or
About Airway Metrics, LLC
Airway Metrics is located in Tacoma WA and manufactures a Premier Bite Registration System for Dental Sleep Medicine. The 16-piece system for simulating Mandibular positions in anterior/vertical combinations assists in identifying a preferred airway position for a Sleep Apnea Appliance.  The Simulator connects to fork and handle for stable bite registration. .  It has been said “An effective oral appliance starts with an accurate Bite Registration”
The system also connects to a New Scanning Bite Fork’. Call or visit
About Kettenbach LP
Kettenbach LP is located in Huntington Beach, CA, and is the exclusive U.S. distributor for Kettenbach GmbH & Co. KG located in Eschenburg, Germany. Founded by August Kettenbach in 1944, Kettenbach GmbH was created for the development and marketing of medical and dental products. Today, the company is one of the leading international producers of impression materials for dental use and is also known in other surgical areas of medicine. For more information about Kettenbach LP products, please call 877-KEBA-123 or visit
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The Effect of Platelet-Rich Fibrin on Soft Tissue and Crestal Bone in One-Stage Implant Placement in Fresh Extraction Sockets: A Randomized Controlled Clinical Trial

 Journal of Oralfacial Sciences
Year : 2018  |  Volume : 10  |  Issue : 2  |  Page : 112-116

The goal of modern dentistry is to prevent tooth loss and provide a healthy dentition with optimal functional efficiency, structural balance, and aesthetic harmony. The placement of an implant immediately after tooth extraction helps to maintain the bone crest and leads to ideal implant positioning from a prosthetic point of view and has the potential of decreasing the total treatment time for patients.  

Aim and Objective: To evaluate the platelet rich fibrin with or without bone ceramic on soft issue and crestal bone in one stage implant placement in fresh extraction socket.  

Materials and Methods: A total of 30 patients were randomly assigned into two groups—each group comprising 15 patients based on platelet-rich fibrin with and without bone ceramic and one-stage implant placement in fresh extraction socket. All patients were prospectively evaluated clinically and radiographically. All the data were analyzed using a software statistical package for social sciences (SPSS) version 11.5 (Chicago, Illinois, USA).  

Results: During the 6-month interval, no implant was lost; the mean bone level at the implants increased in platelet-rich fibrin (PRF) with bone ceramic group and decreased in PRF group and papillary index increased in both the groups, whereas modified sulcus bleeding index and probing pocket depth (PPD) decreased in both the groups.

 Conclusion: It can be concluded that mean crestal bone levels increased in PRF with bone ceramic group, whereas decrease in PRF group and both the groups are statistically significant. When the papillary levels are compared between the two groups, there was no statistical significance, but increased papillary levels were found in both the groups. The mean PPD was decreased in both the groups, but there was no statistical significance between the two groups.

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