Int J Comput Assist Radiol Surg - A method for segmentation of dental implants and crestal bone.

Tópicos

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Resumo

RPOSE: Medical imaging and in particular digital radiographic images offer a great deal of information to dentists in the clinical diagnosis and treatment processes on a daily basis. This paper presents a new method aimed to produce an accurate segmentation of dental implants and the crestal bone line in radiographic images. With this, it is possible computing several measures to biomechanical and clinical evaluation of dental implants positioning and evolution.METHODS: The proposed segmentation method includes two major steps: (1) the preprocessing that combine denoising filters, morphological operations and histogram threshold techniques and (2) the final segmentation involving made-to-measure adjusted and trained active shape models for detecting the precise location of the intended structures.RESULTS: Resulting measurements were compared to manual measurements made by experts on representative radiographs from patients. The calculated intraclass correlation coefficient was 0.75 and showed good reliability of the method, and the Bland-Altman analysis showed 95% of the values within the limits of agreement. The mean of the differences between the manual and method-driven measurements was 0.049 mm ([Formula: see text]) 95% CI, inferior to the established limit (0.15mm).CONCLUSIONS: It was demonstrated that the method achieved a precise segmentation of the intended structures. The validation process on standardized periapical radiographs showed good agreement between the manual measurements and the ones produced by the new method. Future work will be focused on making the method more robust to densitometry changes and to validate the method on non-standardized radiographs.

Resumo Limpo

rpose medic imag particular digit radiograph imag offer great deal inform dentist clinic diagnosi treatment process daili basi paper present new method aim produc accur segment dental implant crestal bone line radiograph imag possibl comput sever measur biomechan clinic evalu dental implant posit evolutionmethod propos segment method includ two major step preprocess combin denois filter morpholog oper histogram threshold techniqu final segment involv madetomeasur adjust train activ shape model detect precis locat intend structuresresult result measur compar manual measur made expert repres radiograph patient calcul intraclass correl coeffici show good reliabl method blandaltman analysi show valu within limit agreement mean differ manual methoddriven measur mm formula see text ci inferior establish limit mmconclus demonstr method achiev precis segment intend structur valid process standard periap radiograph show good agreement manual measur one produc new method futur work will focus make method robust densitometri chang valid method nonstandard radiograph

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