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250 Andrei Mihalache et al. 5. Conclusions 1. Product development (parts/moulds/tools) via integrated reverse engineering represents a fairly new method that is in research and development phase. 2. This paper aims to reveal some of the highlights and weak points of existing scanning equipments. We see that as far as accuracy goes, the best results are obtained by means of contact sensors. Nevertheless, in case of fragile or soft materials, laser or optical systems, without contact, provide better results. The ideal scanning device should be the combination of a camera, laser and contact probe, all, supported by appropriate controller. Received: March, 12, 2010 “Gh. Asachi”Technical University, Department of Machine Manufacturing Iasi, Romania e-mail: andrei.mihalache@yahoo.com R E F E R E N C E S 1. H e r b e r t s o n T., Reverse engineering, in: Fourth International Conference on Industrial Tools ICIT 2003, April 8th–12th, Bled, Slovenia, pp. 419–422. 2. N. N., Scanning Systems for Reverse Engineering, Renishaw Apply Innovation, H- 2000-3120-04-B, Renishaw plc, UK, consulted at 18 November 2009, http://www.renishaw.com/en/cmm-probes-software-and-retrofits--6329 3. H o n g w e i L., Adaptive patch-based mesh fitting for reverse engineering, State Key Lab of CAD&CG, Zhejiang University, Hangzhou 310027, China, Received 13 May 2007; accepted 1 October 2007, pp. 3-10. 4. Z e x i a o X., Complete 3D measurement in reverse engineering using a multi-probe system, Engineering college, Ocean University of China, Qingdao 266071, People’s Republic of China, Received 7 October 2004; accepted 20 January 2005, Available online 7 March 2005, pp. 1135-1139. AVANTAJE ŞI PUNCTE SLABE ALE DIFERITELOR TEHNICI DE INGINERIE INVERSĂ (Rezumat) Dezvoltarea de produse (piese/ matrite/ scule) împreună cu ingineria inversă integrată, este o metodă recentă, aflată în faza de cercetare şi dezvoltare. Aceasta lucrare prezinta unele posibilitati de utilizare si beneficii ale metodei în procesul de productie, dar evidenţiază şi avantajele şi punctele slabe ale diferitelor echipamente de scanare utilizate în prezent.
BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică „Gheorghe Asachi” din Iaşi Tomul LVI (LX), Fasc. 2, 2010 Secţia CONSTRUCŢII DE MAŞINI THERMOGRAPHY APPLIED TO BONE DRILLING BY ROBERTO LOPEZ 1 , MANUEL SAN JUAN 1 , FRANCISCO SANTOS 1 , OSCAR MARTÍN 1 and FLORIN NEGOESCU 2 Abstract. Infrared radiation is a form of electromagnetic radiation. All matter above absolute zero (0 K, -273ºC) emits infrared energy. Thermographic cameras can be used for measure temperatures in a lot of applications. With this new tool we will be able to determine the local heating experienced by the bone during the process of cutting (drilling) for dental implants. The applicability of the temporal sequence of thermograms for dynamic study of the temperature in drilling operations to implant dentistry, is shown to be very high. While there are several aspects to consider when conducting research of this type. Key words: thermography, bone, drilling. 1. Introduction There are many studies directed to determine the influence of the cutting parameters in bone drilling and the production of heat and the increase in the bone temperature due to this heat. In those studies the temperature was measured with thermocouples, the most usual way, or through other variables. There are less studies in the same area that use a more advanced method for the register of the temperature in bone cutting, the thermology. But there are even less studies that use a more dynamic method to obtain the temperature and be able to relate it directly to other variables such as pressure, speed of cutting, etc. Hereby our study tries to make a contribution in the use of the infrared thermology. Infrared radiation is a form of electromagnetic radiation like: radio waves, microwaves, ultraviolet rays, gamma rays, visible light, etc. All of them emit energy in the form of electromagnetic waves and they travel at the speed of light. All matter above absolute zero (0 K, -273ºC) emits infrared energy. Thermographic cameras detect invisible infrared radiation emitted by objects and they transform it in an image inside the visible spectrum in which the color
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