Breakthrough Studies
Landmark peer-reviewed research confirming the long-term efficacy and superiority of the Pinhole Surgical Technique® — from the original 2012 publication to the latest 2025 studies.
14.5-Year Follow-Up Study
Long-Term Retrospective Case Series of the Pinhole Surgical Technique®
This landmark retrospective case series, published in the International Journal of Periodontics & Restorative Dentistry, provides the longest follow-up data ever published for the Pinhole Surgical Technique®. The study confirms that PST delivers sustained, predictable root coverage outcomes over a period of 14.5 years.
Key findings demonstrate that 77.9% of treated sites maintained complete root coverage at the final follow-up, validating PST as a durable, long-term solution for gum recession — comparable to or exceeding traditional connective tissue grafting outcomes.
Split-Mouth Clinical Trial
Randomized Clinical Trial: PST vs. Connective Tissue Graft
This randomized split-mouth clinical trial, published in Compendium, directly compares the Pinhole Surgical Technique® with collagen membrane to the gold-standard connective tissue graft (CTG) procedure. The study design — where each patient serves as their own control — provides the highest level of clinical evidence.
Results demonstrate equivalent clinical outcomes between PST and CTG, while PST patients reported significantly superior patient experience, less post-operative pain, and faster return to normal activities — confirming PST as a clinically valid, patient-preferred alternative to traditional gum grafting.
A Novel Approach to Root Coverage: The Pinhole Surgical Technique
The Original Peer-Reviewed Publication Introducing PST to the World
This is the original study that introduced the Pinhole Surgical Technique® to the dental community. Published in the International Journal of Periodontics & Restorative Dentistry (Vol. 32, 2012), this retrospective study examined the results of PST used for 43 consecutive patients on 121 recession sites over a 33-month period.
The study demonstrated that PST holds promise as a minimally invasive, predictable, effective, and time- and cost-effective method for obtaining optimal patient-based outcomes. No secondary surgical site was necessary, and only bioresorbable membrane or acellular dermal matrix was used as graft material. Mean duration per procedure was just 22.3 minutes with minimal postoperative complications.
What This Means for Patients
Experience Evidence-Based Gum Care
Schedule a consultation with Dr. Chao — the inventor of the Pinhole Surgical Technique® — and benefit from the most clinically validated gum recession treatment available.