No Deviation of Osteotomy Using Single Drill

It appears that multi-drills (MD) causes osteotomy to the least resistant area in an IBS model.  In this section, we are going to show single drill (SD) does not cause osteotomy deviation at the junction of D2 and 4 bone in the same model. 

Prior to use of 4.3 mm SD (Fig.1,3), a Marking Bur (Fig.1 (MB), 2) is applied to create a dimple in the retromolar slope (Fig.4 (occlusal view),5 (lingual view)).  A bone core forms within the non-deviated osteotomy (Fig.6 *) when the SD reaches depth of ~ 5 mm.  When the osteotomy is finished at 13 mm without deviation (Fig.7,10), the bone core is removed from the osteotomy into the middle of the SD (Fig.8,9). 

SD does not cause osteotomy deviation in the left retromolar slope at the junction of the same bone density at ~ 7 mm (Fig.11) or at 13 mm (Fig.12).

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Xin Wei, DDS, PhD, MS 1st edition 11/24/2016, last revision 11/24/2016