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Azerbaycan Saytlari

 »  Home  »  Endodontic Articles 2  »  A new technique for the study of periapical bone lesions: ultrasound real time imaging
A new technique for the study of periapical bone lesions: ultrasound real time imaging
Discussion - References.

The results of this study demonstrated that echographic examination is a real-time imaging technique that has the potential to be used in the assessment of periradicular lesions of endodontic origin.
The energy of US waves is absorbed in the form of heat energy, and direct transfer of the mechanical energy of sound waves into tissue is potentially dangerous because it causes cavitation and vibration (Auer & Van Velthoven 1990). These phenomena depend on the time of application of the sound energy. During US imaging the energy developed is low (max 50 mW cm2 1 ) and the time of application short. Only during 0.1% of total activity is the crystal emitting energy; for the remaining 99.9% of the time it is ‘listening’ (receiving echos). In experimental and clinical studies no adverse effects of ultrasound waves have been reported (Baker & Dalrymple 1978, Fleischer & Emerson 1993). The effect of repeated investigations is less certain, but even so, the risks entailed by radiographic investigations are much greater (Liebeskind et al . 1981, Martin 1984).
A major concern over the performance of ecography was the difficulty in attributing the lesions to a specific area of the maxillary bone (once the exam had been printed) because the dental landmarks (i.e. roots) were not specifically visualized. This made it difficult to orient the lesion in the different regions of the mouth, without using a reference radiograph. In addition, in order to enhance patient comfort and to improve the manipulation of the probe, a high quality, small ultrasound probe should be manufactured for endodontic use.


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