Dental Tribune Asia Pacific Edition No. 4, 2016

By DTI YANGSAN, South Korea: While all- ceramic crowns are commonly used as aesthetic restorative ma- terials for permanent teeth, little research has been conducted on its use and wear in primary teeth. Based on considerations of oc- clusal force in paediatric patients, a Korean study has now investi- gated the applicability of different ceramic restorative materials for use in primary tooth restoration. In the study, the researchers compared zirconia, lithium disil- icate, leucite and stainless-steel crowns to establish their wear. Ten flat crown specimens—primary teeth lost naturally during transi- tion to permanent teeth—were prepared for each of the four study groups and tested for antagonist wear using a CS-4.8 chewing simu- lator (SD Mechatronik). Tooth wear wassimulatedwith100,000chew- ing cycles at a mastication force of 50N.Tomeasurethevolumeofwear, teeth were scanned using a 3-D scanner before and after testing. The final analyses showed that the leucite group had the greatest amount of antagonist tooth wear, followed by the lithium, zirconia and stainless-steel groups. Mean volume losses in the leucite and lithium groups were significantly greater than in the stainless-steel group. However, no significant dif- ference was observed between the stainless-steel group and the zirco- nia group. Intermsofweightlossofrestora- tive materials after testing, the lithium group showed the most, followed by the leucite group and the stainless-steel and zirconia groups. Weight loss in the lithium group was significantly greater than in the stainless-steel and zir- coniagroups,butnosignificantdif- ference was observed between the stainless-steel, leucite and zirconia groups. According to the researchers, the wear of restorative materials and of antagonistic primary teeth tended to be positively related. Moreover, the flexural strength and fracture toughness of the ceramic materials seemed to be correlated with primary tooth wear. Acknowledging the high abra- sion levels associated with leucite and lithium crowns, the re- searchers suggested that both ma- terialsshouldbeusedwithcaution in paediatric dentistry; however, the results of their study should be corroborated in in vivo studies. The study, titled “Wear of primary teeth caused by opposed all-ce- ramic or stainless steel crowns”, was published online on 23 Feb- ruary in the Journal of Advanced Prosthodontics. DENTALTRIBUNE The World’s Dental Newspaper · Asia Pacific Edition Published in Hong Kong www.dental-tribune.asia Vol. 14, No. 4 BERGMANSPEAKS The Henry Schein Chairman and CEOaboutpublic-privatepartner- shipsindentistryand theirimpor- tance for the improvement of oral health worldwide. ” Page 8 FIXEDRESTORATIONS A clinical case involving a com- bination of cutting-edge milling technology and high-quality ve- neering ceramics. ” Page 12 IDEM2016 ReadallaboutAsia’slargestdental event in Singapore in our today specialty section included in this issue. ” Page 17 www.ivoclarvivadent.com Ivoclar Vivadent AG Bendererstr. 2 | FL-9494 Schaan | Liechtenstein | Tel.: +423 / 235 35 35 | Fax: +423 / 235 33 60 Healthy teeth produce a radiant smile. We strive to achieve this goal on a daily basis. It inspires us to search for innovative, economic and esthetic solutions for direct filling procedures and the fabrication of indirect, fixed or removable restorations, so that you have quality products at your disposal to help people regain a beautiful smile. Distinguished by innovation AD Research suggests that primary tooth enamel is thinner than permanent tooth enamel, and thus, more prone to wear.With this in mind, a new study has investi- gated different materials for use in primary teeth restoration. AD Study investigates wearof different ceramics for primarytooth restoration today DTAP0416_01-02_Title 30.03.16 15:16 Seite 1 Bendererstr. 2 | FL-9494 Schaan | Liechtenstein | Tel.: +423 / 2353535 | Fax: +423 / 2353360 DTAP0416_01-02_Title 30.03.1615:16 Seite 1

Dental Tribune Asia Pacific Edition No. 4, 2016

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