Heat Production by 3 Implant Drill Systems After Repeated Drilling and Sterilization

Drilling of Bone: Practicality, Limitations and Complications Associated with Surgical Drill-Bits

“…(b) Rake and relief angles A relief angle in the design of drill-bits is optional but is often incorporated into the cutting process to relieve the thermal loading and mechanical inefficiencies arising from frictional drag between the surface tangential to the direction of cutting and tool. The in vitro work of Chacon et al (Chacon, Bower et al 2006) suggests that relief angle has a significant effect on the magnitude of the maximal temperature rise during drilling of bone. According to Allotta et al (Allotta, Belmonte et al 1996) the relationship between thrust force and drill-bit diameter is approximately linear and not constant.…”

“…As has been outlined above, prominent geometric variables include point angle, rake angle, diameter, chisel edge length and flute number. The maximal temperature attained during drilling and the performance of a drill-bit is highly dependent on the specific drill design (Harris and Kohles 2001;Ercoli, Funkenbusch et al 2004;Chacon, Bower et al 2006;Bertollo, Milne et al 2010). Salient operational factors encompass axial thrust force, rotation speed, torque, orthotopic site, sharpness of the cutting edges, irrigation, cooling systems (closed or open loop), initial drill-bit temperature and cortical thickness.…”

Avaliação Microscópica de Fragmentos Ósseos Obtidos por Diferentes Métodos de Osteotomia e de Irrigação

“…Além do trauma mecânico, as brocas cirúrgicas causam uma injúria térmica ao tecido ósseo cortado; esse aumento na temperatura tem sido o fator mais prejudicial. O calor de atrito gerado no momento da cirurgia irá causar um certo grau de necrose das células vizinhas diferenciadas e indiferenciadas, gerando um risco significativo para a falha da integração óssea 14 . Para uma cirurgia ser atraumática, é necessário manter a temperatura do osso abaixo de 44°C durante a osteotomia 15 .…”

“…Para uma cirurgia ser atraumática, é necessário manter a temperatura do osso abaixo de 44°C durante a osteotomia 15 . Alguns autores 7,14,16 citaram que o osso é sensível a uma temperatura máxima de 47°C, por 1 minuto, sendo que a esta temperatura ocorre a desnaturação da fosfatase alcalina. Esta enzima é de grande importância nos processos de mineralização, pois atua liberando fosfato inorgânico que age com íons cálcio, formando precipitados de fosfato de cálcio (na forma de hidroxiapatita) sobre uma matriz inorgânica, caracterizando o processo de mineralização.…”

Surgical preparation of bone–scaffold interface is critical for bone regeneration inside tissue engineering scaffold

“…The common form of cutting is drilling which is indeed the single most frequent procedure performed in orthopedic surgery. 9 There are numerous studies on the various aspects of drilling, like the design of cutting edges, [10][11][12] drilling speed, 13,14 load, 13 and irrigation. 15 However, the focus of all these studies has been on the corresponding increase in temperature and thermal damage due to drilling the cortical bone.…”