Up to 86% of severe unilateral maxillary sinus infections are odontogenic (Bomeli et al., Laryngoscope 2009), and ~71% of unilateral cases overall (Matsumoto et al., 2015). When the workup points dental, we want to see your patient quickly — same-week appointments, CBCT in one visit, written report and annotated imaging returned the same day.
Six presentations where an endodontic consult belongs in the workup before another antibiotic course or another imaging cycle.
An ENT-managed unilateral maxillary sinusitis that does not clear after the standard antibiotic + intranasal steroid course is the classic MSEO presentation. Up to 86% of severe unilateral cases are odontogenic (Bomeli et al., Laryngoscope 2009). At this point a dental workup is more diagnostic than another antibiotic course.
A previously treated maxillary first or second molar (or premolar) with a persistent periapical radiolucency and intermittent sinus-region symptoms deserves CBCT before retreatment vs. apicoectomy planning. The thin or dehiscent sinus floor over the palatal/MB root frequently shows mucosal thickening on the affected side.
Two-dimensional imaging consistently underestimates sinus-floor relationships. Maillet et al. (J Endod 2011) showed >50% of teeth with apical periodontitis adjacent to the sinus floor had CBCT-positive mucosal changes on the corresponding sinus. We CBCT in Endo Mode (J. Morita Veraview X800, 80 µm voxel, 40 × 40 mm FOV) per the AAE/AAOMR Joint Position Statement.
When a recently completed root canal on a maxillary posterior tooth is followed by new same-side sinus pain, post-nasal drip, or facial pressure, the differential includes apical extrusion of irrigant/sealer into the sinus, missed canal, or coronal microleakage with secondary sinus mucosal reaction. CBCT is the single most useful next step.
A vertical root fracture on a maxillary posterior tooth can produce a chronic odontogenic sinus reaction long before the fracture is visible on a periapical film. Surgical exploration under the microscope is sometimes the only way to confirm or rule it out, and the prognosis decision (retain vs. extract) drives the entire treatment plan.
When the patient's otolaryngologist has documented a unilateral maxillary problem and ruled out septal, nasal, or allergic contributors, the next consultation belongs to an endodontist. We coordinate directly with the referring ENT — written report and CBCT export sent the same day.
A single-visit diagnostic protocol designed so the patient does not need a separate imaging appointment before treatment planning.
Comprehensive endodontic examination — pulp testing (cold, EPT) on every maxillary posterior tooth on the affected side, periodontal probing, palpation, percussion, and bite testing.
Limited-FOV CBCT in Endo Mode on the J. Morita Veraview X800 (80 µm voxel, 40 × 40 mm FOV) — the small-volume, high-resolution protocol the AAE/AAOMR Joint Position Statement on the Use of CBCT in Endodontics recommends. Same-day acquisition; no second appointment needed.
Sinus-mucosa assessment on the CBCT (uniform vs. nodular thickening, ostium patency, presence of fluid level) alongside the periapical assessment of every root tip.
Diagnosis communicated in plain language to both the patient and the referring office, with the endodontic vs. non-endodontic differential explicitly stated.
Treatment plan with prognosis (favorable / questionable / unfavorable) framed per the AAE Treatment Options for the Compromised Tooth (2014) decision guide.
Coordination back to the referring ENT or general dentist when the workup demonstrates the problem is not odontogenic, or when joint medical–dental management is indicated.
Communication is the single most common complaint general dentists and ENTs raise about specialty referrals. We treat it as a clinical deliverable, not an afterthought.
Same-day written diagnostic report with the endodontic diagnosis, the relevant CBCT findings on the affected tooth AND the corresponding sinus floor, and the prognosis category.
CBCT export (DICOM on request; annotated JPEG slices by default) sent to the referring office so the imaging stays with the patient's chart.
A copy of the patient-facing explanation we provided, so the referring office knows exactly what the patient was told and can reinforce the same message.
Direct phone follow-up to the referring clinician within 24 hours on any complex or borderline case — not a portal message, an actual call.
Our MSEO protocol is grounded in the AAE 2018 position statement on MSEO and the primary peer-reviewed literature it cites — Bauer's foundational 1943 anatomy paper, Bomeli's 2009 prevalence study in Laryngoscope, Matsumoto's 2015 ENT-cohort series, Melén's 1986 chronic-sinusitis series, and Maillet's 2011 JOE CBCT study quantifying mucosal response over apical periodontitis. Full citations below.
Submit through the secure online referral form, or call Dr. Kung directly for same-day discussion of a complex case. Urgent cases (acute facial swelling, post-operative complication, suspected fracture) are seen within 24–48 hours.
Want to share the patient-facing companion page with your patient? Sinus pain or tooth pain? — patient guide to MSEO.