9. Endodontics
PBM in endodontics
PBM does not disinfect a root canal system and does not treat pulpal or periapical pathology. Its objective is postoperative symptom modulation.
Post-treatment pain and inflammatory discomfort after appropriate endodontic therapy.
Nociceptive and inflammatory modulation in periapical and periradicular tissue.
Tissue and anatomical targets
- • Periapical projection (buccal/palatal)
- • Attached gingiva over the apex
- • Extraoral projection in deep targets
Clinical objectives
- • Post-treatment pain modulation
- • Inflammatory discomfort modulation
Dosimetric reasoning
- • Target is deep; justify wavelength by penetration and consider extraoral delivery.
- • Record the projection point anatomically so it can be repeated.
Technique
- • Contact over attached gingiva; extraoral for deeper projection.
- • Consistent point relative to the apex.
Limitations
- • No antimicrobial action without a photosensitiser.
- • Does not substitute instrumentation, irrigation or obturation.
- • Acute apical abscess requires drainage and management.
Common errors
- • Using PBM instead of completing endodontic treatment.
- • Applying PBM to an undrained abscess.
Clinical pearls
- • Diagnosis precedes PBM — always, and most obviously here.
Indications and evidence level
Biphasic dose-response, irradiance and light–tissue interaction were established there. Now apply them to this specialty's tissue thickness, vascularity and inflammatory state.
State the diagnosis and clinical objective before selecting a single parameter, and record the evidence level supporting what you tell the patient.
Eye protection for patient, operator and assistant. PBM does not remove the need for diagnosis, clinical judgment or medical coordination.
Knowledge checkpoint
Acute apical abscess with fluctuant swelling. Role of PBM?
Chapter summary
- • The biological principles are unchanged; the target, objective and strategy change.
- • Etiological treatment first; PBM as adjunct where justified.
- • Only claim what the evidence level supports.
- • Systematic reviews and meta-analyses on PBM in dentistry — to be curated by the academic team.
- • International PBM/laser safety guidance applicable in the institution's jurisdiction.
- • Institutional clinical protocol documentation (where authorised).
Linked educational cases
Educational content only. These algorithms are educational decision-support tools and never autonomous medical decision-makers. Clinical decisions remain the responsibility of the treating professional. Certification within OHDR Study™ is not a university award unless an authorised institution has been formally configured.