HOME - Clinical cases - Digital Dentistry
24 November 2021

Monolithic multilayer zirconia fixed partial dentures (FPDs): conventional vs digital impression fabrication

Co-authors: A. Comba, F. Del Bianco

Lorenzo Breschi

Monolithic translucent and multilayer zirconia fixed partial dentures are relatively new treatment that gained popularity thanks to the evolution of dental digital workflows. 
Morsy et al. noticed that the modified microstructure of these material improved aesthetic outcomes, however the effect of such modifications on the fit of the restoration and the clinical success still need to be investigated. In addition, the authors pointed out that also the impression could influence the results of a precise fixed partial denture.
For these reasons they conducted a study to compare the accuracy of conventional and digital impressions based on the fit of produced threeunit fixed partial dentures (FPDs) in vivo and the trueness and precision of both impression techniques. 

Material & Methods
Morsy et. al, from the University of Alexandria, Egypt,  selected twelve patients that received both a conventional polyether impression (group C, control, n=12) and a digital impression with CS3500 (group D, test, n=12). Monolithic multilayer zirconia FPDs were fabricated, and the internal and marginal fit were assessed by the authors using the replica technique, trueness and precision of both impression methods were assessed in vitro. In order to create a reference the authors created a master model. Furthermore, the master model received conventional impressions (group C, control, n=5) and digital impressions (group D, test, n=5) by the researchers. The virtual models of both groups were superimposed over the reference scan (5 superimpositions) using a three-dimensional (3D) processing software, and the 3D deviations were measured and averaged to obtain trueness value. For precision, the virtual models of each group were superimposed over each other (10 superimpositions) and the average deviation value was calculated. The data were analyzed by the authors using one-tailed Mann–Whitney U test at P ≤ 0.05.

The researchers  from Egypt noticed that Group D resulted in a significantly better marginal and internal fit (30.91±15.15 and 30.86±13.57 μm for group D and 40.02±19.50 and 41.86±18.94 μm for group C). Furthermore the mean values of trueness and precision for conventional and digital techniques noticed by the authors were comparable (trueness: 62.8±5.45 and 62.72±12.01 μm and precision: 56.47±27 and 60.9±14.5 μm, respectively).

Morsy et al. concluded that no significant difference was found between conventional and digital impressions in 3D datasets accuracy. In addition, both techniques resulted in FPDs with an acceptable clinical fit. However, the authors noticed that FPDs fabricated using the digital technique displayed better internal and marginal fit.

For more information: Fit of monolithic multilayer zirconia fixed partial dentures fabricated by conventional versus digital impression: a clinical and laboratory investigations.

Related articles

Author: Rafi Romano

The following case presenta- tion will present complex aes- thetic and functional case of sever deep bite with relapse of previous orthodontic treatment in childhood, combined with periodontic...

Editorial Team

Over the past several years, Carestream Dental has been transforming the clinical, practice management and business aspects of oral and maxillofacial surgery to be less siloed and more connected so...

Market analytics company, Emergen Research, forecasts that the global dental 3D printing market will reach a growth rate of 26.5% CAGR during 2028, according...

Carestream Dental does more than just manufacture and sell digital dental technology; it also invests in partnership and education to ensure its users get the most from their systems so they can...

Carestream Dental and the respected Dr. Francesco Mangano of the Mangano Digital Academy have joined forces to deliver must-know digital dental topics directly to...

Read more

Florida based National Dentex Labs, maker of prosthetics and restorative dentistry products, has acquired Fager Dental Lab of Pennsylvania. NDX has acquired labs of late in an effort to expand its...

Align Technology, a leading global medical device company that designs, manufactures, and sells the Invisalign system of clear aligners, iTero intraoral scanners, and exocad CAD/CAM software for...

Authors: Giulia Pradal, Daniela Sorrentino, Niccolò Lombardi, Alberto Pispero, Laura Moneghini

A 76-year-old male patient was sent to the oral medicine service of the San Paolo Hospital in Milan for the presence of a radiolucent lesion at the level of the left mandibular corner, found through...

vTail, maker of a platform for healthcare communication, has brought its technology to the US dental market. The app connects healthcare professionals with medical products firms and provides...

Henry Schein announced its presence at the 2021 Greater New York Dental Meeting, featuring a rich lineup of product demonstrations and educational offerings designed to help oral health professionals enhance practice efficiency.

Visitors to the GNYDM can explore the Company’s comprehensive portfolio of products and solutions that help optimize every step of the practice workflow, including digital equipment, technology...


Most popular




Copyright © 2021 - All Rights Reserved
ISSN 2767-1178