Implant Surgery, Placement and Bone Grafting Basics

A dental implant is a small titanium screw placed in the jawbone to replace a missing tooth's root. Once bone fuses to its surface — osseointegration — it can hold a crown, bridge or full denture with near-natural grip. Implants are now the standard replacement because, unlike bridges, they don't require cutting down healthy neighbouring teeth.

But an implant is only as good as its bone. After tooth loss the jaw shrinks, sometimes leaving too little height or width for safe placement. Bone grafting rebuilds that lost bone, before or during implant surgery, so the implant stands on solid foundation.

Key Concepts

• Osseointegration: direct bond between living bone and titanium, maturing over 3-6 months.
• Primary stability: the mechanical grip at placement (insertion torque ideally 30-45 Ncm) — the implant must not wobble.
• Two-stage vs immediate placement: implant buried under gum to heal versus placed into a fresh socket the same day.
• Graft materials: autograft (patient's own bone — gold standard), allograft (donor), xenograft (e.g. bovine mineral), alloplast (synthetic).
• GBR (guided bone regeneration): graft particles under a membrane that excludes gum tissue while bone grows in.
• Sinus lift: grafting beneath the maxillary sinus floor to gain height for upper back implants.

How It Works

1. Plan with 3D imaging. CBCT measures bone height and width and maps nerves and sinuses; implant size and angle are chosen on the scan.
2. Prepare the site. Under local anaesthesia, sequential drills shape the socket to match the implant.
3. Place the implant. Thread it in with controlled torque — 35 Ncm is typical — then fit a cover screw or healing cap.
4. Graft thin areas. Pack graft particles around gaps or thin walls and cover with a membrane.
5. Wait for integration. About 3 months in the lower jaw, 4-6 months in the softer upper jaw, before loading the crown.
6. Restore and maintain. Fit the abutment and crown; lifelong meticulous cleaning prevents peri-implantitis (gum disease around implants).

Worked Example

A 50-year-old woman missing an upper first molar has only 5 mm of bone below the sinus — too short for a 10 mm implant. A sinus lift packs about 2 g of xenograft under the sinus membrane, gaining roughly 5 mm (5 + 5 = 10 mm). Six months later a 4.5 mm × 10 mm implant goes in at 35 Ncm torque. With 1.5 mm of bone needed each side, the ridge must be 4.5 + 1.5 + 1.5 = 7.5 mm wide — hers measures 8 mm, so it qualifies. The crown follows 4 months later: about 10 months total for a tooth meant to last decades.

Common Misconceptions

• "Implants finish in one sitting." Surgery is quick, but bone needs months to fuse — early loading causes failure.
• "Implants can't get infected." Peri-implantitis destroys surrounding bone, usually from poor cleaning.
• "Anyone can have immediate placement." It needs intact socket walls and no active infection; many cases need grafting first.

Real-World Applications

• Single-tooth replacement without damaging neighbouring teeth.
• Full-arch rehabilitation: 4-6 implants carrying a complete fixed set of teeth.
• Implant-retained dentures ending the trouble of loose dentures in older patients.

Implants succeed on precise 3D planning with good placement torque, plus enough bone — grafted when nature left too little. Respect the healing timeline, keep the implant clean for life, and it can serve like a natural tooth for decades.