Our Practice

Westtown Dental Associates is located in beautiful Westtown Township, Pennsylvania and was started in 1985 by Dr. Barbara Diorio and Dr. David Swintek. Dr. Brent Guenthner joined the practice in 1995.

Our Philosophy

Westtown Dental Associates is committed to providing quality dental care in a modern, comfortable environment. The caring doctors and dental team have the experience and dedication to make your visit with us pleasant and painless.

Our Doctors

Barbara Diorio, DMD

Barbara Diorio, DMD

Barbara J. Diorio, DMD graduated from Temple University School of Dentistry and completed a General Practice residency at Abington Memorial Hospital. Dr. Diorio has been in private practice since 1985. She has a professional membership with the American Dental Association, Pennsylvania Dental Associate, Chester and Delaware County Dental Association and the Academy of Facial Esthetics. Dr. Diorio’s areas of special interest are general, cosmetic, implant restorative dentistry and total facial esthetics. Dr. Diorio has been listed in “Who’s Who in Dentistry” and voted “Top Dentist” in both Philadelphia Magazine and Main Line Today.

When away from the office, Dr. Diorio enjoys outdoor activities, volunteering, traveling and spending time with her family.


  • 1979 B.S. Biology- Albright College
  • 1984 D.M.D. – Temple University School of Dentistry
  • 1984-1985 Resident Abington Memorial Hospital
David Swintek, DMD

David Swintek, DMD

David E. Swintek, DMD established Westtown Dental Associates in 1985. Dr. Swintek is originally from the Pittsburgh area where he attended the University of Pittsburgh. Dr. Swintek graduated from Temple University School of Dentistry in 1984 with honors. He has professional membership with the American Dental Association, Pennsylvania Dental Association and several study clubs.

Dr. Swintek is experienced in all phases of complex restorative dentistry including placement and restoration of dental implants.


  • 1979 B.S. Biology- University of Pittsburgh
  • 1984 D.M.D. – Temple University School Of Dentistry
Brent Guenthner, DMD

Brent Guenthner, DMD

Dr. Brent Guenthner has resided in Chester County, Pennsylvania since grade school, graduating from Downingtown High School. He had decided to become a dentist at an early age which lead him to attend Albright College as a Pre-dental Major and obtaining a B.S. degree in Biology. Dr. Guenthner graduated from Temple University Kornberg School of Dentistry in 1994. While attending Dental School, he was inducted into The Omicron Kappa Upsilon Dental Honor Society. He also received the Operative Dentistry and Oral Medicine Department Awards. After Dental School, he completed a General Practice Dental Residency, gaining advanced training in treating medically compromised patients, traumatic dental injuries, and general dentistry. He then joined Westtown Dental Associates and has seen the practice evolve into a dynamic general dental practice.

Dr. Guenthner resides in Malvern with his wife and two children. When not practicing dentistry, he enjoys running, golfing, gardening, and being with his family.


  • 1990 B.S. Biology – Albright College
  • 1994 D.M.D. – Temple University School of Dentistry
  • 1994-1995 Resident Pennsylvania College of Medicine
Our Doctors enjoy building relationships with our patients and families. Dentistry goes beyond treating teeth. Comprehensive dental care should involve overall body health and complete facial esthetics.

Comprehensive and Cosmetic Dentistry for the Whole Family

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