Orthodontics on St Quentin provides treatment care to children, adolescents and adults. With practices located around Perth, speak to us for an appointment today! Dr. Sivabalan Vasudavan is a Specialist Orthodontist who has completed more than 10 years advanced clinical and academic training at world class institutions. Dr Siva is committed to offering exceptional care to his patients and welcomes you to his specialist practices. Orthodontics on St Quentin is a modern, architecturally designed specialist practice, conveniently located across from the Claremont Quarter Shopping Precinct.