** Shares of SDI SDI.AX rise as much as 8.3% to A$0.905, their highest level since March 10

** The dental technology company says the FY25 gross profit margins improved to 63%, up from 62.1% from a year before, driven by ongoing production efficiencies and product mix

** However, co's preliminary unaudited total sales for FY25 at A$111 million ($72.31 million), down 0.2% compared with the prior corresponding period (pcp)

** Co sees FY25 net profit after tax in the range of A$10 million - A$10.4 million

** Stock is down 23.5% YTD, including the session's moves

($1 = 1.5352 Australian dollars)

(Reporting by Anjali Singh in Bengaluru)

((anjali.singh2@thomsonreuters.com))