Continuous and intermittent bone distraction using a microhydraulic cylinder: an experimental study in minipigs

Biomechanical Configurations of Mandibular Transport Distraction Osteogenesis Devices

“…69 The hydraulic cylinder, the tube, and the remote control are filled with uncompressible fluid to power the movement of the piston. 70, 71 The hydraulic activation mechanism (Fig. 5D) is based on the principle of a hydraulic pump, which is composed of two parts, the hydraulic cylinder and the piston.…”

Assessment of Maxillary Distraction Forces in Cleft Lip and Palate Patients

“…Although distraction osteogenesis of the maxilla is well reported in the literature, no study has been published describing the monitorment of distraction forces necessary to advance the maxillary bone either in humans or in animals. It may be explained due to the difficulties encountered to measure the healing process accurately and for the complexity of monitoring techniques available today (Wiltfang et al, 2001). Several studies have been performed to assess the magnitude of traction forces applied on the distracted structure.…”

“…The maximum force occurred after activation of force and attained values over 8 Kgf. In the craniofacial area, Wiltfang et al (2001) using a micro hydraulic distractor device on the mandible of pigs observed that forces up to 2500kPa were necessary to move the cylinders` piston and 1200 -1300 kPa necessary for continuous distraction. Robinson et al (2001) measured the mean force of 4.2 N-cm of torque or an equivalent force of 35.6 N to lengthen the human mandible.…”

“…In the daily bone lengthening procedure, the greatest forces are produced in a short period of time immediately after lengthening. They could be reduced to decrease pain in the patient and loads on the device by performing lengthening over a greater number of steps or using dynamic equipment able to absorb these forces (Wiltfang et al, 2001). Aarnes et al (2002) has shown that in the stepwise lengthening, a total lengthening of 1 mm cause less force accumulation than a 1.75 mm elongation.…”

“Distraction Osteogenesis” an Emerging Concept in the Correction of Craniofacial Deformities

“…It also eliminates the necessity of bone grafts and associated donor site morbidity, need for implants and problems of incompatibility and the requirement of maxillo-mandibular fixation. As native bone is created, it enables the surgeon Sapru to have post-operative control allowing the procedure to be stopped at any point of time according to requirement of the case [10]. It also provides good longterm stability, since locally regenerated original bone is created along with appropriate neuromuscular re-adaptation and stimulation of the efficiency of the reduced functional matrix in the region, thus yielding aesthetic results that are much superior to those obtained by skeletal surgery or by soft tissue surgery done independently, or by combination of both [11].…”