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Pennsylvania-trained expertise to provide conservative, evidence-based periodontal and implant care. Dr. Sourvanos is a graduate of the University of Pennsylvania, where he also completed his periodontal training. This practice was formerly known as Veasey B. Cullen, where Dr. Cullen served York and Hanover for fifty-three years, maintaining periodontal health for multiple generations of families throughout our five decades of dedicated service. We maintain continuity through experienced, familiar staff while leveraging academic research and cutting-edge technology to achieve optimal outcomes for every patient.