Dental Tribune Asia Pacific Edition No.12, 2017

Dental Tribune Asia Paciﬁc Edition | 12/2017 TRENDS & APPLICATIONS 13 New materials for a classic indication Cementation of all-ceramic restorations using Variolink Esthetic 1 3a 2 3b Fig. 1: Pre-op situation.—Fig. 2: Situation after composite build-up (Tetric N-Ceram Bulk Fill) and preparation.— Figs. 3a & b: Crown design in the software suite (in- Lab) and try-in before crystallisation firing (IPS e.max CAD).—Fig. 4: Characterised and glazed crown.—Fig. 5: Etching and silanating with Monobond Etch & Prime. www.idem-singapore.com www.idem-singapore.com AD By Drs Eduardo Mahn & Juan Pablo Sánchez, Chile Zinc phosphate cements are seen as classic luting materials for the cementation of metal–ceramic crowns. Along with all-ceramic materials, glass ionomer cements (GICs) and resin-modified glass ionomer cements (RMGICs) were introduced. Generally, luting ce- ments are expected to meet cer- tain requirements: they should provide an optimum bond to the tooth structure and restorative material, must not be soluble in water, should be suitable for appli- cation in thin coatings and should offer long-term stability. This is in contrast to the properties of clas- sic cements, which are water solu- ble and do not establish an adhe- sive bond to the enamel or dentine 4 5 (zinc phosphate cements) or estab- lish only a minimally adhesive bond and only to the dentine (GICs and RMGICs). Nonetheless, these cements show reasonable survival rates if used for the appropriate in- dication even if they have certain limitations. Problem 1: Opacity The opacity of the luting ma- terial is a critical issue for all- ceramic crowns, as well as ce- ramic inlays and onlays. Almost any colour can theoretically be reproduced with ceramics by ex- ploiting their natural translu- cent properties. Using an opaque luting material appears to be counter-productive in achieving this. Further critical issues are the limitations involved in the anterior region and the lo- cation of the cement line in the visible area for in- lays and onlays. For in- stance, if a tooth is re- stored with a veneer, the basic shade of the tooth is maintained; only the enamel is replaced, usu- ally by using a translucent ceramic that covers the natural dentine. In such a case, it is essential to use a translucent luting mate- rial to achieve a favourable result. Problem 2: Adhesion The comparatively low bond strength of conven- tional cements is also prob- lematic. Classic prepara- tions around the tooth cre- ate a high degree of friction 13 -15 APRIL 2018 SUNTEC SINGAPORE THE LEADING DENTAL EXHIBITION AND CONFERENCE IN ASIA PACIFIC MEET THE 2018 CONFERENCE SPEAKERS Galip Gurel Magda Feres Christopher Ho Simone Grandini Lawrence Lau Magda Mensi Angelo Mariotti Marcus Dagnelid Andreas Kurbad TRADE EXHIBITION Meet over 550 exhibitors at IDEM and discover the latest products and services the dental industry has to offer. IDEM attracts all the major players in the dental industry to the Asia Pacific for three power packed days of exhibition, making it the ideal platform to cement your existing professional relationships and connect with future business partners. EARLY BIRD REGISTRATION CLOSES ON 31 JANUARY 2018! Registration Connect with us Koelnmesse Pte Ltd Ms. Cindy Tantarica T: +65 6500 6700 E: idem-reg@koelnmesse.com.sg IDEM Singapore IDEM Singapore idem.sg Endorsed by Supported by Held in Organised by Singapore Dental Association

Dental Tribune Asia Pacific Edition No.12, 2017

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