Bausch & Lomb Inc. reported that it...

Bausch & Lomb Inc. reported that it has reached a definitive agreement to acquire Dental Research Corp. of Atlanta for $133 million in cash. Dental Research manufactures and markets a patented line of devices used by consumers for the removal of dental plaque . . . Los Angeles-based Times Mirror Co. increased its quarterly dividend to 25 cents per share, from 23 cents per share, on the company’s outstanding shares of Series A common stock and Series C common stock, payable March 10 to shareholders of record Feb. 24 . . . The board of Zenith National Insurance Corp. of Woodland Hills has authorized the repurchase of up to 1 million shares of its common stock, depending upon market conditions.