HOME - Clinical cases - Digital Dentistry
09 May 2021


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

Lorenzo Breschi

In recent years, cad-cam technologies were introduced in dentistry in order to improve accuracy  and reduce operative time and production costs of prosthetic restorations.
Cad-Cam software are based on standard libraries and often require several time consuming adjustments by the dental technician, during crown design,   and by the dental clinician during  the cementation appointment. To overcome the problem, the correlation technique was proposed to design the occlusal surface of a crown by replicating the anatomy of the original tooth thanks to a preliminary intraoral scan, thus avoiding library based cad-cam projects. This technique could also be employed for duplicating the occlusal surface of the provisional prosthesis to the definitive one.
In this context, Di Fiore et al. conduct a controlled clinical trial to compare the static and dynamic contacts (SDC) of monolithic zirconia crowns designed by using library technique compared to correlation techniques applied on provisional crowns.

Material & Methods
Di Fiore et al. included twenty-four patients in the study for a total of 28 molars. The authors fabricated an interim crown for each abutment tooth and collected two digital scans , with and without the interim crown in place. Two single crowns were designed using the correlation and the library techniques. After that fifty-six monolithic zirconia crowns were milled and evaluated intraorally for SDC using a 24-μm-thick blue articulating foil by the researchers. Photographs were also taken of to calculate the SDC area using  a software (ImageJ). 

The results collected by the authors showed that the average and standard deviation (SD) of area of the occlusal marks of the interim crowns was 32.27 ± 3.45 mm2 while that of the definitive crowns designed by using the correlation technique was 31.01 ± 3.73 mm2 and that of  the library technique was 36.85 ± 5.78 mm2.
Di Fiore et al found a significant difference between the areas of occlusal marks of the interim and definitive crowns designed by using the library technique, and between the areas of occlusal marks of definitive crowns designed by using the correlation and library techniques (p < 0.001). 

The authors of the present study concluded that the average area of the SDC of monolithic zirconia crowns designed by using the correlation technique was similar to that of interim crowns. Moreover, the library technique resulted to be less effective when replicating the SDC compared to the correlation technique. 

(Photocredit: Dott. Federico Del Bianco)

For additional information: Automatic Digital Design of the Occlusal Anatomy of Monolithic Zirconia Crowns Compared to Dental Technicians’ Digital Waxing: A Controlled Clinical Trial. 

Related articles

Shade Guide for BruxZir® Zirconia Dental Restorations

Glidewell launched a shade guide to accompany its BruxZir® Zirconia dental restorations. The new BruxZir® Zirconia Shade Guide allows dentists using the brand name crowns and bridges to have a more...

Nowadays metal-free restorations are widely used as an alternative to metal-ceramic. However, ceramic chipping is a common complication of Zirconia layered restorations and, for that reason...

Zirconia (ZrO2) is a high-strength polycrystalline ceramic and is considered a suitable material for single crowns (SC) and fixed multi-unit dental prostheses (FDP), as it tolerates higher occlusal...

Titanium implants    have been successfully used for the replacement of teeth for over 40 years, mechanical and biological stability and excellent long-term results make titanium  the gold...

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

The margin of prosthetic restorations is a key factor for clinical success. In terms of periodontal health, the scientific literature has shown a preference towards supragingival preparations.To...

Read more

USA     18 June 2021 - 30 November 0001

ADHA Annual Conference 2021

June 18-20, 2021. Phoenix, Arizona.

As the largest event dedicated to dental hygienists, this meeting is just for you! 

The treatment of palatal displaced canines (PDCs) is one of the most challenging treatments in orthodontic dental care. The invasive and long-lasting treatment often requires interceptive extraction...

Recorded webinar - Oral Surgery - Prof. Testori

Sinus elevation surgery has become a sought-after part of implant dentistry. Procedures have evolved over the last 25 years to a point where sinus grafting surgery is considered one of the most...

Dental billing platform company, Vyne Dental, has acquired patient communications company, Operability, LLC. The acquisition also includes Operability’s OperaDDS platform, which launched in 2011 to...

Authors: Monica Giani, Umberto Pagliaro, Lorenzo Franchi, Roberto Rotundo, Michele Nieri

Purpose. The aim of this randomized clinical trial with blinded examiner was to compare the efficacy of four different methods of enhancing oral hygiene motivation in: (i) reducing the full-mouth...


Most popular




Copyright © 2021 - All Rights Reserved
ISSN 2767-1178