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Related Experiment Video

Updated: Jun 16, 2026

Finite Element Analysis Model for Assessing Expansion Patterns from Surgically Assisted Rapid Palatal Expansion

Finite Element Analysis Model for Assessing Expansion Patterns from Surgically Assisted Rapid Palatal Expansion

Published on: October 20, 2023

Pulp vitality after rapid palatal expansion.

Jamin J Cho, Stella Efstratiadis, Gunnar Hasselgren

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics

|February 16, 2010

Summary

Rapid palatal expansion (RPE) therapy in adolescents did not cause pulp necrosis in posterior teeth. Pulp vitality testing confirmed that teeth remained responsive after RPE treatment, indicating no long-term damage.

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Area of Science:

Orthodontics
Dental Pulp Physiology
Craniofacial Development

Background:

Orthodontic treatment, particularly rapid palatal expansion (RPE), may potentially affect dental pulp vitality.
Previous clinical studies have not systematically investigated the incidence of pulp necrosis following orthodontic interventions.
Understanding pulp response to RPE is crucial for assessing treatment safety in adolescent patients.

Purpose of the Study:

To clinically evaluate pulp testing responses in posterior permanent teeth after rapid palatal expansion (RPE).
To determine if RPE therapy alters the vitality of the dental pulp in adolescent patients.

Main Methods:

A cohort of 25 adolescent patients (ages 10-16) received RPE using a hyrax appliance.
Pulp vitality was assessed using electric pulp testing (EPT) and cold testing (CT) on maxillary molars and premolars.
Testing was conducted before appliance cementation, during RPE activation, and at various follow-up intervals during retention.

Main Results:

Initially, all teeth tested positively for pulp vitality.
Following RPE, a small number of teeth showed reduced EPT response, requiring CT for confirmation of vitality.
All teeth, including one initially non-responsive molar, demonstrated positive pulp responses by the retention phase (3-9 months post-treatment).

Conclusions:

Rapid palatal expansion therapy in children and adolescents did not result in pulp necrosis of the evaluated posterior permanent teeth.
Dental pulp vitality is maintained throughout and after RPE treatment, suggesting it is a safe orthodontic procedure for pulp health.