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ePaper created 2016-06-21, 09:24:47 | version 1.38.0
use of CBCT case report | 09 cone beam 2 2016 depth was divided into three groups. A lingual con- cavity (depth ≥ 2mm) was observed in 80% of the jaws.In20%ofthecases,therewereflatdepressions less than 2mm in depth (Type I) and in 52% of the cases the concavities were two to three mm deep (TypeII).About28%oftheexaminedregionsshowed significant concavities of more than three mm (Type III). The obtained distribution did not reveal any de- pendence on age and gender of the patients exam- ined in this study (p > 0.05). Kobayashi et al. found that measurement errors ranged from 0 to 1.11mm (0%to6.9%)onCTandfrom0.01to0.65mm(0.1% to 5.2%) on CBCT, with measurement errors of 2.2% and1.4%,respectively(p=0.0001).29 Basedonthose results, this study suggests that distance can be measured accurately by using CBCT. Lascala et al. concluded in their study that, although CBCT image underestimates the actual distances between skull sites, differences are only significant for the skull base and therefore it is reliable for linear evaluation measurements of other structures more closely as- sociated with dentomaxillofacial imaging.30 According to Chan HL et al. the incidence of lingual plate perforation during implant placement is pre- dictedtobe1.1%to1.2%andwillmostlikelyhappen in type-U ridge.3 Conclusion Images acquired using two-dimension (height and width) radiography cannot reveal valuable infor- mation in third-dimension (depth). This fact limits its use. In certain situations, for example deep SF for implantselection,three-dimensionalvisualisationof the anatomical limitation is desirable. In those cir- cumstances, three-dimensional imaging provided byCBCTisextremelyvaluable.Incomparisontopan- oramic radiograph, the use of CBCT can greatly im- prove the visualisation leading to a more definitive diagnosis and the best possible treatment plan._ Theauthordeclaresnoconflictofinterest. Editorial note: A list of references is available from the publisher. Fig. 10: Axial CBCT slice demonstrates the height of the extraction socket is 8mm. Fig. 11: Deep SF. Fig. 12: CBCT images providing a virtual implant position and angulation. contact Dr Souheil R. Hussaini, BDS, MS Oral Implantology Medical Center 204 Al Wahda Building, Port Saeed Rd, Deira, P O Box 39695 Dubai, UAE Tel.: +971 4 2956595, Fax: +971 4 2958757 souheilh@eim.ae, www.ID-SC.com Fig. 10 Fig. 11 Fig. 12 22016 Tel.: +97142956595, Fax: +97142958757