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Review
. 2016:2016:9840594.
doi: 10.1155/2016/9840594. Epub 2016 Aug 18.

"Digitally Oriented Materials": Focus on Lithium Disilicate Ceramics

Fernando Zarone  1 , Marco Ferrari  2 , Francesco Guido Mangano  3 , Renato Leone  1 , Roberto Sorrentino  2
Affiliations
Review

"Digitally Oriented Materials": Focus on Lithium Disilicate Ceramics

Fernando Zarone et al. Int J Dent. 2016.

Abstract

The present paper was aimed at reporting the state of the art about lithium disilicate ceramics. The physical, mechanical, and optical properties of this material were reviewed as well as the manufacturing processes, the results of in vitro and in vivo investigations related to survival and success rates over time, and hints for the clinical indications in the light of the latest literature data. Due to excellent optical properties, high mechanical resistance, restorative versatility, and different manufacturing techniques, lithium disilicate can be considered to date one of the most promising dental materials in Digital Dentistry.

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Figures

Figure 1
Figure 1
Case  1 (Monolithic Lithium Disilicate Onlays). Maxillary posterior teeth in a 25-year-old female patient affected by severe food behavior disorder (bulimia). One year before the dental treatment, she was considered healed by a psychotherapist and declared recovered. The teeth were not prepared; only minimal smoothing of some sharp edges was performed.
Figure 2
Figure 2
Case  1 (Monolithic Lithium Disilicate Onlays). After conventional impressions, the casts were scanned by a 3-Shape D700 (3 Shape, Copenhagen, Denmark) digital scanner and analyzed by means of a Dental System  15.5.0 software (3 Shape) and the restorative finish lines were detected. Then, occlusal shape design and contacts were defined.
Figure 3
Figure 3
Case  1 (Monolithic Lithium Disilicate Onlays). The wax patterns of the posterior onlays were milled out of a wax disk (Cera SDD98A18RWC, Sintesi Sud, Avellino, Italy) using a Roland DWX-50 Dental Milling Machine (Whip Mix GmbH, Louisville, KY, USA) and then repositioned on the cast. After careful checking, the lithium disilicate heat pressed onlays (IPS e.max Press MT, Ivoclar Vivadent) were made and eventually polished.
Figure 4
Figure 4
Case  1 (Monolithic Lithium Disilicate Onlays). The onlays after adhesive cementation.
Figure 5
Figure 5
Case  2 (Bilayered Lithium Disilicate Veneer Replacement). A female patient asked for the replacement of 6 porcelain laminate veneers with discolored and fractured margins. After the study of the case, done with the aid of digital software programs, a crown lengthening procedure was performed.
Figure 6
Figure 6
Case  2 (Bilayered Lithium Disilicate Veneer Replacement). The old veneers were carefully removed under stereomicroscopic control; after the new supragingival preparations, an intraoral scanning device (3-Shape D700) was used to take digital impressions of both dental arches.
Figure 7
Figure 7
Case  2 (Bilayered Lithium Disilicate Veneer Replacement). The new smile design was cut away and inserted in the patient's physiognomic image. After designing the new veneers, they were pressed with lithium disilicate (IPS e.max Press MT) and veneered.
Figure 8
Figure 8
Case  2 (Bilayered Lithium Disilicate Veneer Replacement). The new veneers at the end of the treatment.
Figure 9
Figure 9
Case  2 (Bilayered Lithium Disilicate Veneer Replacement). The patient's smile.
See this image and copyright information in PMC

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