What the IABDM, IAOMT and HDA Listings Mean
The International Academy of Biological Dentistry and Medicine publishes a member directory with three certification tiers above plain membership — Certified, Fellow and Master. A directory listing indicates IABDM membership; the certification tiers are earned separately and are stated on the member's own record. The tier for each IABDM clinician below is taken from that record, linked under the clinic.
The International Academy of Oral Medicine and Toxicology publishes its own member directory, with three tiers above plain membership — Accredited, Fellow and Master. SMART (the Safe Mercury Amalgam Removal Technique) is a separate IAOMT certification, not a tier. The tier or certification stated for each IAOMT clinician below is taken from IAOMT’s own member data, and the member’s IAOMT record is linked under the clinic.
The Holistic Dental Association publishes a public directory of its members, each with a profile page of their own. HDA membership is an association membership with no certification tier, so an HDA clinician below is labelled “HDA member” and nothing more, and the member’s HDA profile is linked under the clinic.
Verified Biological Dentistry Clinics — Lake Oswego
This placement is open
Promoted listingOne clinic per city and specialty holds this first position, awarded first come, first served. It is labelled as promoted, and introduction requests for Biological Dentistry in Lake Oswego are routed to it rather than shared. Credentials are verified exactly as for every listing, and inclusion itself is free — any credentialed clinic can request a free listing.
Claim this placementCredentialed clinician:
Larry Bowden, DMD — Holistic Dental Association record · verified 24 October 2026
Larry Bowden, DMD — International Academy of Biological Dentistry and Medicine record · verified 24 October 2026
Larry Bowden, DMD — International Academy of Oral Medicine and Toxicology record (SMART) · verified 27 October 2026
2 credentialed clinicians:
Shepard DeLong — Holistic Dental Association record · verified 24 October 2026
Shepard DeLong — International Academy of Oral Medicine and Toxicology record · verified 27 October 2026
Jeeyoung Han — International Academy of Oral Medicine and Toxicology record (SMART) · verified 27 October 2026
Dental Arts & Wellness
IABDM memberCredentialed clinician:
Manami Yamaguchi, DMD — International Academy of Biological Dentistry and Medicine record · verified 24 October 2026
What to Establish Before a Case
- Is the full SMART protocol followed for amalgam removal? SMART specifies dam isolation, high-volume evacuation, dedicated air filtration and sectioned removal — ask which elements the clinic actually uses.
- Is material biocompatibility assessed per patient? Material selection in biological dentistry is tested, not assumed.
- Are zirconia implants placed and restored in-house? Metal-free implants have their own surgical and restorative protocol.
- Which adjuncts are used, and with what evidence? Ozone and laser endodontics are adjuncts to, never substitutes for, mechanical protocol.
Case fees are typically quoted fee-for-service, cash pay. SMART amalgam removal with a composite replacement runs about $250–$450 per tooth (Real Dental Costs, reviewed May 2026), and a single-tooth implant $3,000–$5,600, with zirconia posts adding $500–$1,500 (NewMouth, updated May 2026). These are ranges, not quotations.
Frequently Asked Questions
Does a listing here mean the dentist is accredited in biological dentistry?
No. The bodies behind these listings publish their own member directories, and only some have tiers above membership — the IABDM’s Certified, Fellow and Master; the IAOMT’s Accredited, Fellow and Master, with SMART a separate IAOMT certification. The Holistic Dental Association has none: an HDA listing means membership of the association, stated as “HDA member”. Each listing on this page states only what its own body records, and that body’s record is linked under the clinic.
How many verified biological dentists practise in Lake Oswego?
4 credentialed clinicians at 3 clinics in Lake Oswego, OR hold a verified biological credential as re-verified on 27 October 2026 (2 HDA members · 1 SMART-certified · 1 IABDM member).
Has any clinic paid to be listed here?
No. No clinic has paid to be listed — this is a community-driven, free directory built on public and member listing data. Any credentialed clinic can request a listing at no charge, and free listings are not capped. Each city and specialty also has one clearly-labelled promoted listing, awarded first come, first served: it is placed first in the list, never decides whether a clinic is listed, and its credentials are verified exactly like every other listing.
What should a patient verify before booking?
Confirm the credential directly with the issuing body rather than relying on a clinic website; ask which elements of the SMART protocol are actually used for amalgam removal; ask how material biocompatibility is assessed; and confirm the clinic is fee-for-service before discussing case cost.