Align Technology Inc. provided earnings guidance for the first quarter of fiscal 2013. For the quarter, the company expects net revenues to be in a range of $146.0 million to $150.5 million. Invisalign clear aligner case shipments for first quarter 2013 are expected to be in a range of 95,000 to 97,500 cases, which reflect a year-over-year increase of 11.4% to 14.3%.

Earnings per diluted share for first quarter 2013 are expected to be in a range of $0.21 to $0.23. Starting in fiscal year 2013, amortization of acquired intangible assets will no longer be excluded as a non-GAAP measure. Gross profit is expected to be in a range of $105.8 million to $110.1 million.

Gross margin is expected to be in a range of 72.4% to 73.1% and operating margin is expected to be in a range of 15.8% to 17.1%. The company expected the effective tax rate to be approximately 24%.