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Some experiences<br />

­ Minimally invasive inserti<strong>on</strong> of titanium<br />

microscrews is feasible; the markers stay stable<br />

for several weeks<br />

­ Increasing the number of markers bey<strong>on</strong>d 3<br />

screws does not influence registrati<strong>on</strong> accuracy<br />

­ Exact localisati<strong>on</strong> of screwhead centroids is<br />

necessary<br />

­ Mobility of mucosa in atrophic patients caused<br />

inaccuracies when using splint­type soluti<strong>on</strong>s,<br />

even if residual dentiti<strong>on</strong> is available<br />

W. Birkfellner

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