Sirona Dental Systems (SIRO) topped analysts' fiscal Q4 estimates and announced a new CEO Friday morning, sending shares up about 6% in early trading. Sales for the quarter, which ended Sept. 30, rose 13% over the year-ago quarter to $247 million, well above Wall Street's consensus of $224 million. Profit, excluding items, was 71 cents a share, up 3 cents from last year and a penny over consensus. The company also guided fiscal 2013 EPS at $3.33