Most Nevada County families know Dr. Lindsey Robinson as the children’s dentist with the castle and patients’ upside-down televisions in her office. But her colleagues know her professional credentials go well beyond her child-friendly office. On Nov. 11, Robinson will be installed as the president of the California Dental Association, the largest statewide dental association in the country, boasting nearly 25,000 members. The CDA represents more than 70 percent of dentists practicing in the state and has the single largest membership in the American Dental Association. “It’s a real honor and tremendous responsibility,” said Robinson, who was elected by her …