Page 38 - CEREC Q4|2012
Basic HTML Version
34
|
cerecdoctors.com
|
quarter 2
|
2013
| | |
R o s e n b l at t
Fig. 7: While in the purple stage, the IPS
e.max CAD A3 restoration was tried in
to check marginal fit and interproximal
and occlusal contacts
Fig. 8: The IPS e.max CAD restoration
was placed in a steam cleaner
Fig. 9: The cervical third of the restoration
stained with IPS e.max Shade 2
Fig. 10: IPS e.max Shade 4 was used to
create occlusal pit-and-fissure charac-
terizations; white was applied to the de-
scending cusps; and blue was placed on
the buccal aspect of the outside cusps
Fig. 11: Three separate coats of IPS e.max
CAD Crystallization Glaze Spray were
placed
Fig. 12: View of the final IPS e.max
CAD restoration in the mouth
proposal of the restoration prior tomilling
(Fig. 6). After milling and while in the
purple stage, the IPS e.maxCADA3 resto-
ration was tried in to check marginal fit
and interproximal and occlusal contacts
(Fig. 7).
4
The IPS e.max CAD restoration
was placed in a steam cleaner to remove
oil and residue from the milling process
and any adjustments (Fig. 8).
Then, the cervical third of the restora-
tion was imparted with gingival shading
using the IPS e.max Shade 2 (Fig. 9). IPS
e.maxShade 4was used to create occlusal
pit-and-fissure characterizations; white
was applied to the descending cusps; and
blue was placed on the buccal aspect of
the outside cusps (Fig. 10).
Once the stains were fixated, three
separate coats of IPS e.max CAD Crys-
tallization Glaze Spray were placed (Fig.
11). Time was allowed for the glaze to dry
in between applications.
Following application of the Glaze
Spray, the Programmat CS over hoodwas
opened, and the restoration placed on the
new, smaller firing tray. The P3 program
was selected to begin the optimal short
firing cycle.
Conclusion
The Speed Crystallization technique
resulted in an esthetic and accurately
fitting restoration in less time than is
normally involved with chairside lithium
disilicate restorations (Fig. 12). This manu-
facturer-approved process ensured that
the desired brightness and opacity for the
restoration would remain stable. It also
helped to maintain appropriate material
solubility and the final gloss of the restora-
tion. Other speed programs of less than 14
minutes and 50 seconds pose risks to the
microstructure, physical properties and
esthetics of CAD-fabricated lithium disili-
cate restorations.
For questions and more information,
Dr. Rosenblatt can be reached at
References
1. Kurbad A, Reichel K. CAD/CAM-manufactured
restorations made of lithium disilicate glass ceramics.
Int J Comput Dent. 2005 Oct;8(4):337-48.
2. Guess PC, Zavanelli RA, Silva NR, Bonfante EA, Coel-
ho PG, Thompson VP. Monolithic CAD/CAM lithium
disilicate versus veneered Y-TZP crowns: comparison
of failure modes and reliability after fatigue. Int J
Prosthodont. 2010 Sep-Oct;23(5):434-42.
3. Lin WS, Ercoli C, Feng C, Morton D. The effect of
core material, veneering porcelain, and fabrica-
tion technique on the biaxial flexural strength
and weibull analysis of selected dental ceramics. J
Prosthodont. 2012 Jul;21(5):353-62. doi: 10.1111/j.1532-
849X.2012.00845.x. Epub 2012 Mar 29.
4. Lin WS, Harris BT, Morton D. Trial insertion proce-
dure for milled lithium disilicate restorations in the
precrystallized state. J Prosthet Dent. 2012
Jan;107(1):59-62. doi: 10.1016/S0022-3913(12)60020-1.
7
8
9
10
11
12
