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Call Us Today!
(925) 682-3929
Call Us Today!
(925) 682-3929

About Us

  • Gary Grill, DDS,
  • Tonya Nelson Crystal, DDS, MD
  • Eric J. Herbranson, DDS, MS, Endodontist
  • William Murphy DDS
  • Sharon Rufo, RDH
  • Silvia Febo, Receptionist/Supervisor
  • Andrea Will, Receptionist, RDA
  • Vidya Verma, RDA
George F. Koerber, DDS, Owner
George F. Koerber, DDS, Owner

Gary Grill DDS MS
Gary Grill, DDS
As a practitioner in the field of Periodontics and Implantology, I am dedicated to providing the highest level of service.  My aim is to serve in the preservation and restoration of the form and function of dentition through providing accessible state of the art periodontal therapy.  I am committed to providing patients with a professional, warm, and caring environment in which to receive treatment, and also to serving as a reliable, valuable, and trusted resource to dental professionals in the Bay Area.
Dr. Nelson-Chrystal
Dr. Nelson-Chrystal
Dr. Nelson-Chrystal earned her Doctorate in Dental Surgery from the University of California, Los Angeles in 2005.  She then continued her education at the University of Maryland’s Medical School, earning her Doctor of Medicine (M.D.). She completed her 6-year Oral and Maxillofacial Residency at the University of Maryland.
Some of Dr. Nelson-Chrystal’s professional memberships include the American Medical Association, American Dental Association, California Dental Association, Tri-Beta Honor Society, Christian Medical Dental Association, American Dental Society of Anesthesiology, California Association of Oral and Maxillofacial Surgery, American Association of Oral and Maxillofacial Surgery.
She is also an active member of several community service outreach programs as well as volunteer oral surgeon for Smiles For Kids. She enjoys spending her free time with her husband, children, and grandchildren.
Dr. Herbranson
Dr. Herbranson

Dr. Herbranson graduated with a DDS degree from Loma Linda University in 1970 and a MS in Endodontics from Loma Linda University in 1973. He has practiced endodontics in the East Bay since that time.

He has been actively involved in education for years, having given many lectures locally and nationally on endodontics as well as presentation skills and microscope photography. He is on the faculty of the University of the Pacific School of Dentistry and lectures at Loma Linda University School of Dentistry. He is an Opinion Leader for a major endodontic supply company and helped develop their corporate education protocols. 

He is nationally recognized in the endodontic field and his interest in photography has resulted in the creation of a small company that builds camera mounts for surgical operating microscopes.  Another of his interest is the development of a computerized atlas of the anatomy of human teeth.  It has been recognized as a significant tool in learning the complex microanatomy of teeth and is currently being adapted by many dental schools in the United States.  It can be viewed at

Dr. Herbranson
William Murphy, DDS

Dr. Murphy attended San Francisco State University and graduated with a Bachelor of Arts degree in Biology in 1967. He attended Howard University College of Dentistry in Washington, D.C. and graduated number three out of a class of eighty students in 1972. He completed a three-year residency in Oral and Maxillofacial Surgery at Howard University Hospital in 1975 obtaining a Certificate in Oral Surgery. After thirty years of very successful solo private practice of Oral and Maxillofacial Surgery in Oakland, he has joined our group multispecialty and general dentistry practice here in Concord. We look forward to serving the Oral and Maxillofacial Surgery needs of our dental colleagues here in Contra Costa County.

Dr. Murphy is Board Eligible and a Fellow of the American Association of Oral and Maxillofacial Surgeons.
He is a member of the American, Association of Oral and Maxillofacial Surgeons and the California Association of Oral and Maxillofacial Surgeons. He is also a member of the American Dental and California Dental Association.

He resides in the Contra Costa County City of Orinda and has interests and hobbies that include birdwatching, skiing, fishing, hiking, traveling, reading, and community charity work. Dr. Murphy is married and has three adult children.

Affordable Dentistry For Adults & Children
State-Of-The-Art Comfort - Friendly & Caring Staff
Preventative & Periodontal Oriented Dental Practice

Call Us Today At ♦ (925) 682-3929

The Dental Center At Sears
1001 Sun Valley Boulevard
Concord , CA 94520
Phone: 925-682-3929
In Business Since 1997

Business Hours

Mon: 10:00 AM - 06:30 PM
Tue: 10:00 AM - 06:30 PM
Wed: 10:00 AM - 06:30 PM
Thu: 10:00 AM - 06:30 PM
Fri: 10:00 AM - 06:30 PM
Sat: Closed
Sun: Closed

Payment Options