National Health Care Systems Inc.: The Irvine-based...

National Health Care Systems Inc.: The Irvine-based dental plan company posted net earnings of $163,000 for the second quarter, 30% higher than the $125,000 reported for its 1989 second quarter. Revenue was up 33%, to $3.2 million from $2.4 million. Net income for the first half totaled $314,000, a 74% increase over $180,000 recorded for the same period last year. Revenue rose 47%, to $6.3 million from $4.3 million.