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(A) Bone harvest from the retromolar trigone with the use of a trephine (4 × 6 mm) bur; (B) a detail of the bone sampling site; (C) the bone defect obtained by the separation of the bone segments is filled with bone chips, which were condensed in the space between the buccal and palatal bone plates with the aim of completely filling the space; (D) a detail of the bone graft.
Source publication
Aim:
The aim of this technical note is to present a computer-aided design-computer-aided manufacturing (CAD-CAM) surgical guide to perform a computer-guided bone biopsy. Traditionally, to diagnose abnormal conditions affecting jawbone, a bone biopsy is performed with the use of a trephine bur. The positioning of the bur, during the biopsy, is base...
Contexts in source publication
Context 1
... a crestal incision, bone from the retromolar trigone was harvested using a trephine (4 × 6 mm) and then fragmented into particles (bone chips). The bone defect obtained by the separation of the bone segments was filled with bone chips, which were condensed in the space between the buccal and palatal bone plates with the aim of completely filling the space (Figure 1). The mucoperiosteal flap was sutured using tension-free single sutures (GORE-TEX, W.L.Gore and Associates, Inc., Flagstaff, AZ, USA). ...
Context 2
... a crestal incision, bone from the retromolar trigone was harvested using a trephine (4 × 6 mm) and then fragmented into particles (bone chips). The bone defect obtained by the separation of the bone segments was filled with bone chips, which were condensed in the space between the buccal and palatal bone plates with the aim of completely filling the space (Figure 1). The mucoperiosteal flap was sutured using tension-free single sutures (GORE-TEX, W.L.Gore and Associates, Inc., Flagstaff, AZ, USA). ...
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In surgical dentistry, the sampling of the biomaterial of the jaws is usually carried out with the help of dental trepans. As a result of osteotomy, a friction force inevitably arises during trepan biopsy, which can lead to local hyperthermia and, as a consequence, coagulation necrosis of both the bone tissue of the jaw itself and damage to the resulting biopsy. Local overheating can lead to complicated healing of a bone wound in the area of a trepan biopsy, lead to difficulties in verifying the morphological picture of the disease and, as a consequence, further treatment of the patient. When conducting a navigational trepan biopsy using a surgical template, the risk of hyperthermic exposure increases, and the question of choosing the rotation speed becomes obvious. The literature presents limited data on osteotomy regimes using a trepan cutter during jaw bone biopsy, including using a navigational surgical template, which determined the relevance of the study. The purpose of the study: to determine the permissible speed of rotation of the trepan cutter during the navigation trepan biopsy of the jaw bones. Materials and methods: 20 (5) micro-preparations were made from trepan biopsies of the femur of cattle, obtained at speeds of 800 rpm, 500 rpm, 250 rpm, 50 rpm in the classical way; 15 (5) micro-preparations were also made from trepan biopsies obtained at speeds of 350 rpm, 200 rpm, 50 rpm using a surgical navigation template. The width of pathological changes in the tectorial properties of ostein due to coagulation damage of the bone matrix in microns was measured using SlideViewer (3DHISTECH), a built-in tool for measuring linear parameters in microns. The statistical significance of the obtained values was determined using the Kraskel – Wallis H-test. Results: with osteotomy at a speed of 50 rpm, the width of the bone matrix damage reached up to 10 microns. As the rotation speed increased, the width of the damage also increased: at 200 rpm – Me = 36.8 microns, 350 rpm – Me = 98.6 microns. Conclusion: when conducting a navigational trepan biopsy using a surgical template, the recommended rotation speed of the instrument is up to 350 rpm.