HOME - Clinical cases - Prosthodontics
 
 
30 July 2019

Nanoceramics, PICN and lithium disilicate for CAD/CAM system: mechanical properties and internal fit.

Simona Chirico


Computer-aided design/computer-aided manufacturing (CAD/CAM) was introduced in dentistry forty-years ago, and gained popularity worldwide because of advancements in restorative materials with characteristics such as crack tolerance, ease of clinical use and good performance. Among the most common CAD/CAM materials we found: nanoceramics, vitreous ceramics interpenetrated in a resin matrix (PICN) and lithium disilicate. These materials belong to different families of ceramics and therefore have different properties. 

But which material among these guarantees a better result?

The study published by Goujat et al, in the Journal of Prosthetic Dentistry, tried to give an answer by analyzing the mechanical properties and internal fit of these CAD / CAM materials.      

MATERIALS AND METHODS
The materials tested in this study were a PICN material (Vita Enamic), 2 composite resin nanoceramics (Lava Ultimate; 3M ESPE and Cerasmart; GCDental Products), and a lithium disilicate glass-ceramic (IPS e.max CAD). Mechanical properties were evaluated according to ISO norm DIS 6872:2013. Bar-shaped specimens (18×3×3 mm) were prepared and submitted to a 3-point bend test using a universal testing machine at a cross-head speed of 0.5 mm/min. In addition, identical cavities were prepared in 60 human mandibular extracted molars (n=15) and optically scanned to receive mesioocclusodistal inlays milled with the 4 materials tested in a CEREC Inlab milling machine. The replica technique and a stereomicroscope (×20) were used to measure the internal fit of the inlays at 9 preselected locations. All data were statistically analyzed using 1-way ANOVA and the post hoc Tukey multiple comparison or Games-Howell test (a=.05).

RESULTS
As can be seen from the table below (table 1), the best results were recorded by lithium disilicate.

CONCLUSIONS
Despite all these CAD / CAM materials are valid for a restoration, the best results were recorded for the lithium disilicate IPS e.max CAD followed by the Cerasmart nanoceramic

(Photocredit by Dr Roberto Spreafico)


For additional informations: 
Mechanical properties and internal fit of 4 CAD-CAM block materials

  • Table 1: results

    Table 1: results

Related articles

Premolars are the most difficult elements to restore and have a high failure rate due to their anatomical position and the forces they undergo. Therefore the choice of the material to restore...


With the development of CAD/CAM system, nowadays the most used materials in the prosthetic fields are: zirconia and lithium disilicate. In particular, in a...


The increased aesthetic demand, without sacrificing the preservation of biological structures, has led to the development and use, in recent years, new generations...


Restoration of teeth with insufficient coronal tooth structure due to deep caries, resorption or traumatic injury with fracture line extended under gingival...


Read more

Authors: D. Migliari, N. Sugaya, M. Trieveiler.

Reported by his dentist, a 76-year-old patient turns to our observation and has noticed for about a month the appearance of a lesion on the back of the tongue. The clinical examination reveals the...


Etiology   Dentin hypersensitivity (DH) is defined as diminutive and sharp pain which arises from exposed dentin surface in reaction to a stimulus of...


Restoration of teeth with insufficient coronal tooth structure due to deep caries, resorption or traumatic injury with fracture line extended under gingival...


A certain pain symptomatology is found, after a root canal treatment, with a frequency that varies between 3% and 58% of the cases.It is above all a complication both for the dentist and, above all,...


In the latest issue (November 2019) of the Angle Orthodontist an article was published about a technique developed to help the removal composite during...


 
 

Newsletter

 
 
 
 

Most popular

 
 

Events