Millions of Fibers, One Extraction: The Instruments That Do the Work

Every extraction a veterinarian performs requires severing millions of periodontal ligament fibers — and the instrument chosen determines whether that job takes brute force or finesse.

That is the framing Dr. John Lewis, VMD, DAVDC, Fellow-AVDC OMFS, offers in his latest column for Veterinary Practice News, a follow-up to last month's review of diagnostic and treatment equipment. Lewis teaches at Silo Academy Education Center and practices at Veterinary Dentistry Specialists in Chadds Ford, Pa.

Why teeth resist extraction

The periodontium — the tissue surrounding a tooth — consists of the root surface (cementum), alveolar bone, gingival connective tissue, and the periodontal ligament. That ligament spans a narrow space between the alveolar bone and the cementum of the root surface. Lewis notes the ligament's collagen fiber bundles, composed of type I, III and V collagen, account for roughly 50–75 percent of its volume. Millions of these fibers must be torn or severed before a tooth leaves its alveolus.

The ligament space itself is typically just 0.25 mm wide — a dimension that dictates instrument design across the entire extraction toolkit.

How do elevators and luxators differ?

Extraction begins by detaching the gingival connective tissue with a blade or periosteal elevator. Lewis names the 15C scalpel blade as a favorite among veterinary dentists for incising gingiva and making releasing incisions. Sharp periosteal elevators work best for elevating mucogingival flaps.

Winged elevators — also called Wiggs elevators — have thin wings that fit into the periodontal ligament space. Once seated, the handle is turned to leverage the tooth and stretch and tear the ligament fibers. For firmly rooted teeth, that is sometimes enough. For challenging teeth, Lewis reaches for a luxator.

Luxators function like miniature scalpel blades. Instead of twisting the handle, the operator inserts the instrument into the ligament space and moves it side to side, in a motion Lewis compares to a windshield wiper, driving the blade deeper to cut more attachment structure. Their thin profile — built to enter that 0.25 mm space — makes them prone to dulling and damage, so frequent sharpening and replacement are necessary. Some manufacturers now offer modular blades that detach from the handle, and replacement programs reduce the sharpening burden.

Both instruments demand controlled handling. Lewis advises keeping an index finger extended along the shaft so that when — not if, he writes — the instrument slips, the finger acts as a stop against damage to nearby structures.

What about powered options?

An automated periotome acts, in Lewis's description, like a jackhammer driving a thin blade into the periodontal ligament space. It suits challenging extractions but fails where the ligament space is ankylosed, and its thin, flexible tips can break.

Piezosurgical units have changed oral surgery in both human and veterinary patients. Lewis uses his unit for maxillectomies and mandibulectomies, and occasionally for difficult extractions. Extraction-specific piezosurgery tips work whether or not ankylosis is present; though shorter than automated periotome tips, they can advance up to approximately 10 mm to free periodontal attachments.

What has replaced root pulverization?

The old pulverization, or atomization, technique — drilling a root into oblivion — has given way to the moat technique. A high-speed bur with a long shaft and thin working end creates a moat around the root, locating its periphery while removing buccal bone to open a window through which the root can be gently pried. Lewis's bur of choice is the ¼ surgical length round bur.

A small luxator, a Davis root tip elevator, or the small end of a feline periosteotome then fits into the space on the lingual or palatal surface, delivering the root with gentle leverage.

The ¼ round bur carries a caveat: its dainty working end breaks easily under a heavy hand or metal fatigue, so Lewis considers it a single-use bur in his practice.

His closing advice for the next extraction day: count the millions of periodontal ligament fibers you bested — technique, not force, got them there.