Acceleration Technologies: Piezocision and Corticotomy

Because conventional orthodontic treatment is slow, a range of technologies has been proposed to speed tooth movement by deliberately stimulating the bone around the teeth. Surgical approaches such as corticotomy and the minimally invasive piezocision technique make controlled cuts in the alveolar cortex to provoke a transient surge of bone turnover — the regional acceleratory phenomenon — during which teeth move more quickly. This topic gathers the rationale, mechanism, and evidence for these and related acceleration methods.

Definition

Acceleration technologies are interventions — most prominently corticotomy and the minimally invasive piezocision procedure — that aim to increase the rate of orthodontic tooth movement, typically by inducing a localized, transient increase in bone remodeling around the teeth.

Scope

This topic covers surgically assisted and device-based methods intended to accelerate orthodontic tooth movement, focusing on corticotomy and piezocision: how they are thought to work through the regional acceleratory phenomenon, what the comparative evidence shows about their effect and durability, and the trade-offs involved. It is a reference overview of the methods and their evidence, not a recommendation to use any particular technique.

Key concepts

• Corticotomy
• Piezocision (minimally invasive corticotomy)
• Periodontally accelerated osteogenic orthodontics (PAOO)
• Regional acceleratory phenomenon
• Transient demineralization and remodeling
• Surgical versus non-surgical acceleration methods
• Durability and relapse of the accelerated effect

Key theories

Regional acceleratory phenomenon (RAP)

Surgical injury to bone, such as the cortical cuts of corticotomy or piezocision, triggers a localized, time-limited increase in bone turnover and reduced bone density (demineralization), during which the alveolar bone remodels faster and teeth can be moved more rapidly before the bone remineralizes.

Mechanisms

Acceleration methods seek to exploit the regional acceleratory phenomenon: a localized injury to bone provokes a burst of remodeling in the surrounding tissue, transiently lowering bone density and increasing the activity of bone-remodeling cells. Corticotomy achieves this with surgical cuts through the cortical plate around the teeth to be moved, often combined with bone grafting in the periodontally accelerated osteogenic orthodontics approach; piezocision uses an ultrasonic instrument to make minimally invasive corticotomy cuts through small soft-tissue incisions, avoiding full flap elevation. During the resulting window of heightened turnover, the alveolar bone offers less resistance and teeth move faster; as the bone remineralizes, the effect wanes. Non-surgical approaches — including vibration and certain light or pharmacological stimuli — have also been investigated, but their biological effects and clinical benefit are less consistently demonstrated.

Clinical relevance

These technologies are relevant to questions about treatment duration and patient burden, and understanding their mechanism and evidence helps in appraising claims of faster orthodontics. This entry describes the methods and their evidence base for reference; whether any acceleration technique is appropriate for a given patient is an individualized clinical decision involving surgical risk, cost, and uncertain benefit, made by the treating clinician.

Evidence & guidelines

Systematic review evidence, including Long et al. (2013), indicates that surgical methods such as corticotomy can increase the short-term rate of tooth movement, but studies are limited in number and quality, the magnitude and durability of benefit are uncertain, and non-surgical methods have weaker support. The biological rationale (the regional acceleratory phenomenon) is better established than the long-term clinical advantage.

History

Surgical assistance to orthodontic movement dates back to twentieth-century reports of corticotomy and bone-block techniques. The modern surgical approach was reframed by the Wilcko brothers, who attributed accelerated movement to transient demineralization and the regional acceleratory phenomenon and combined corticotomy with grafting in periodontally accelerated osteogenic orthodontics. Dibart and colleagues later introduced piezocision as a minimally invasive alternative, and a broader literature on surgical and non-surgical acceleration accumulated thereafter.

Debates

Do acceleration technologies deliver a clinically worthwhile, lasting benefit?

Surgical methods can speed movement in the short term, but the size and durability of the benefit, the added surgical risk and cost, and the weaker evidence for non-surgical methods leave their overall value contested.

Key figures

• M. Thomas Wilcko
• William M. Wilcko
• Serge Dibart
• Hu Long

Seminal works

• wilcko-2013
• long-2013

Frequently asked questions

How are corticotomy and piezocision supposed to speed tooth movement?

Both make controlled cuts in the alveolar bone that trigger the regional acceleratory phenomenon — a transient local increase in bone turnover and reduced bone density — during which teeth meet less resistance and can be moved more quickly until the bone remineralizes.

What is the difference between corticotomy and piezocision?

Corticotomy is a more invasive procedure that usually involves raising a surgical flap to cut the cortical bone, often with bone grafting; piezocision uses an ultrasonic instrument through small soft-tissue incisions to make the cuts with less surgical exposure.