Dental Tribune Asia Pacific Edition

By DTI HANGZHOU, China: In measuring the effect of surgical templates on theaccuracyofimplantplacement, a Chinese study recently found that actual and planned implant positions varied significantly. Ac- cordingtotheresearchers,errorsin computer-guided implant surgery are caused by either the operator during surgery or the surgical tem- plate preoperatively. In order to evaluate the effect of surgical templates on the accuracy of implant placement, jaws from 16 patients were scanned using conebeamcomputedtomography (CBCT). Fifty-three implants were planned in a virtual 3-D environ- ment, of which 35 were placed in the mandible and 18 in the maxilla. For the analyses, a stereolitho- graphic surgical template was cre- ated. The template was then fitted on a plaster model and both were scanned with a CBCT device. The images obtained were matched to images of the virtual planned im- plant position. The actual implant position was acquired from the registration position of the surgical template. In comparing the data, the re- searchers found significant devia- tion between actual and planned positions caused by the surgical template. The mean central de- viation at the hex and apex was 0.456 mm and 0.515 mm, respec- tively. The mean horizontal de- viation at the hex was 0.193 mm and at the apex was 0.277 mm. The mean vertical deviation at the hex was 0.388 mm and at the apex was 0.390 mm. The mean angular deviation was 0.621°. The results of the study indicate that clinicians should not rely solelyonthesafetyofsurgicaltem- plates in seeking to avoid critical anatomical structures. Discover the new time-saving composite www.ivoclarvivadent.com Ivoclar Vivadent AG Bendererstr. 2 | 9494 Schaan | Liechtenstein | Tel.: +423 235 35 35 | Fax: +423 235 33 60 The nano-optimized 4-mm composite Tetric ® N-Ceram Bulk Fill • Bulk filling is possible due to Ivocerin® , the patented light initiator • Special filler technology ensures low shrinkage stress • Esthetic results are achieved quickly and efficiently in the posterior region 4 mm to success 4 mm AD 03Dental TribuneAsia Pacific Edition | 12/2015 ASIA PACIFIC NEWS Deviation between implantpositionsfound They found that this polymeri- sation, carried out in buffered aqueous solutions, can be used to coat a wide range of organic and inorganic substrate materials. The coating is biofriendly and cellsreadilygrowonandcoloniseit and could therefore be applied to medical devices, such as dental im- plants, catheters and pacemakers to improve their performance and acceptance by the body, according to the researchers. “The non-toxic coating is ad- hesive and will coat almost all material, making its potential biomedical applications really broad,” said lead research Dr Richard Evans.“This research opens the door to a host of new biomed- ical possibilities that are yet to be explored.” As the coating process is very simple and uses methods and sub- stances that are already available, biomedical manufacturers can produce improved results more cost effectively compared with ex- isting techniques. CSIRO is the first organisation to investigate practical applications of this kind using prebiotic chem- istry. It is currently seeking to part- ner with manufacturers to exploit this technology. The study, titled “Prebiotic- chemistry inspired polymer coat- ings for biomedical and material science applications”, was pub- lished online on 13 November in the NPG Asia Materials journal. ¯ Page 1 Bendererstr. 2 | 9494 Schaan | Liechtenstein | Tel.: +4232353535 | Fax: +4232353360

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