TAILIEUCHUNG - Modelling Simulation and Optimization

Tham khảo sách 'modelling simulation and optimization', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 1 Three-dimensional diagnosis and visualization supports in orthodontics based on Reverse Engineering and Solid Free-form Fabrication techniques Alida Mazzoli1 Michele Germani2 Roberto Raffaeli2 and Antonio Gracco3 1 Department of Materials and Environment Engineering and Physics Università Politecnica delle Marche Via Brecce Bianche 60131 Ancona Italy 2 DT M Group Department of Mechanics Università Politecnica delle Marche Via Brecce Bianche 60131 Ancona Italy 3 Department of Orthodontics Università di Ferrara Via Montebello 31 44100 Ferrara Italy 1. Introduction Diagnosis means the art or act of identifying a disease from its signs and symptoms Merriam Webster Dictionary 2009 . The maxillofacial region extending from the base of the skull to the hyoid bone is one of the most anatomically complex regions of the body. This area contains elements and organs belonging to a number of different systems that can be affected by a variety of local and systemic pathologic processes. Diagnostic imaging has assumed a central role in the evaluation of this region. New trends in dentistry include digital and three-dimensional 3D imaging. The ultimate reward of the technologic imaging advancements is the digital representation of the patient s anatomy as it exists in nature anatomic truth . Oral and maxillofacial radiology provides the dentist with diverse diagnostic equipments. Current and evolving methods include computed tomography CT tomosynthesis Badea et al. 2001 tuned-aperture CT TACT Webber et al. 1997 localized or cone-beam CT Heiken at al. 1993 and magnetic resonance imaging MRI Olt Jakob 2004 . Although oral and maxillofacial radiology is nowadays widely accepted as a routine technique for dental examinations the equipments are rather expensive and furthermore the radiation dose required to enhance both contrast and spatial resolution can be unacceptably high. A solution to this problem is partially given by the use of maxillofacial dedicated cone-beam CT equipments

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