Missed Canal Treatment in Beaverton, OR
Missed Canal Treatment is a specialized dental service provided by the board-certified specialists Dr. Merat Ostovar and Dr. Jovan Gvozden at Aloha Dental Specialty Center in Beaverton, OR. Untreated canals are the leading cause of root canal failure. Our endodontic specialists use CBCT imaging and surgical microscopy to locate, negotiate, and treat canals that were missed during initial root canal therapy — saving teeth that would otherwise require extraction.
Finding and Treating Canals Missed During Initial Root Canal Therapy
A missed canal is exactly what it sounds like — a root canal within the tooth that was not identified, accessed, or treated during the original endodontic procedure. Research consistently shows that missed canals are the single most common reason root canals fail. The untreated canal harbors bacteria, necrotic pulp tissue, and biofilm that continue to sustain periapical infection even though the treated canals appear well-obturated on a two-dimensional radiograph. At Aloha Dental Specialty Center, our endodontic specialists focus specifically on identifying and treating these overlooked anatomical structures using technology and training that go beyond what is available in most general dental offices.
Certain teeth are especially prone to having missed canals. The upper first molar is the most frequently cited example: its mesiobuccal root contains a second canal (the MB2) in approximately 90–95% of teeth studied in micro-CT research, yet this canal is identified and treated in only 40–60% of initial root canal procedures performed without microscopic magnification. Lower molars may harbor a middle mesial canal, a second distal canal, or a C-shaped canal configuration. Lower premolars can have bifurcating canals, and even anterior teeth occasionally present with two canals instead of one. Without CBCT imaging and operating microscope visualization, these anatomical variations are easily overlooked — and the result is persistent or recurrent infection.
Our approach to missed canal treatment begins with a detailed CBCT scan that provides axial, coronal, and sagittal views of every root and its internal canal anatomy. We identify the location and trajectory of the missed canal before we even begin the procedure, which allows us to plan the most conservative access strategy. Under the operating microscope, we use ultrasonic tips to selectively remove dentin overlying the canal orifice, then negotiate the canal with pre-curved hand files before shaping with contemporary nickel-titanium rotary instruments. Thorough irrigation with sodium hypochlorite activated by ultrasonic energy ensures disinfection of the newly accessed canal along with the previously treated canals. Three-dimensional warm vertical obturation seals the entire canal system, and the tooth is then ready for its permanent restoration.
Related Dental Services
Serving Beaverton, Aloha, Hillsboro & Washington County
Aloha Dental Specialty Center is located at 18455 SW Alexander St, Suite A, in Beaverton, Or 97003egon. We serve patients from across the Tualatin Valley and greater Portland metro, including Aloha, Hillsboro, Tigard, Lake Oswego, and Tualatin. Our Beaverton office is a 5-minute drive from Aloha, 10 minutes from Hillsboro, and 15 minutes from Tigard via SW 185th Avenue.
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Intel Campuses (Ronler Acres & Jones Farm)
10 to 15 minutes via NW 185th Ave. We accommodate the schedules of tech professionals who need efficient, high-quality specialty care.
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Nike World Headquarters
About 8 minutes via SW Baseline Rd. We frequently see patients from the Nike campus for surgical and implant procedures with sedation options.
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Streets of Tanasbourne & Orenco Station
Easily accessible via US-26 and NW 185th. Local general dentists in these communities regularly refer patients to us for specialty procedures.
Why Local Dentists Refer to Us
We work as a trusted partner to general dentists throughout the Tualatin Valley. When cases require CBCT-guided planning, IV sedation, bone grafting, or other advanced procedures, local providers refer to our specialists for their fellowship-trained expertise and predictable results.
We handle the complex phases and coordinate closely with your general dentist for seamless continuity of care from start to finish.
Understanding Your Investment
At Aloha Dental Specialty Center, we provide transparent pricing before any treatment begins. The cost of your procedure depends on clinical complexity, materials used, and sedation requirements. We walk you through every line item during your consultation so there are no surprises.
What Affects Cost:
- Clinical Complexity: Bone loss, sinus proximity, nerve involvement, or the need for grafting affects treatment planning and surgical time.
- Materials: We use research-backed implant systems, purified bone graft matrices, and high-strength ceramics from established manufacturers.
- Sedation: Options range from local anesthesia to IV sedation, each with different associated costs. We discuss the best option for your comfort and procedure.
Insurance & Financing
We accept most major dental insurance plans and file claims on your behalf. Our team verifies your benefits before treatment and submits pre-treatment estimates with clinical documentation to maximize coverage.
For out-of-pocket costs, we partner with CareCredit and Cherry for flexible payment plans. We also offer our ADSC Dental Savings Plan for patients without insurance.
Recovery After Missed Canal Treatment
First 24–48 Hours
Expect mild to moderate soreness in the treated tooth, particularly when biting. This tenderness reflects the body’s healing response in the periapical tissues now that the previously untreated canal has been cleaned and sealed. Over-the-counter ibuprofen taken on a schedule (600 mg every 6 hours with food) is typically sufficient. Avoid hard or crunchy foods and chew on the opposite side. Some patients notice the tooth feels slightly different — this is normal as the periapical inflammation begins to resolve.
Days 3–10
Biting tenderness typically diminishes significantly by the end of the first week. Resume normal brushing and flossing, being gentle around the treated tooth. If a temporary filling was placed, avoid sticky foods that could dislodge it. Schedule your permanent restoration appointment with your general dentist within two to three weeks. If you were prescribed antibiotics for a pre-existing infection associated with the missed canal, complete the entire course as directed regardless of symptom improvement.
Weeks 4–24
The periapical lesion associated with the missed canal will begin to show signs of healing on follow-up imaging. We typically obtain a radiograph at three months and again at six to twelve months to confirm bone regeneration around the root. During this time, it is critical that your permanent restoration (crown) is in place to prevent coronal leakage. Full radiographic resolution of the lesion may take up to one year, though clinical symptoms should resolve much earlier.
CBCT-Guided Canal Localization and Microsurgical Navigation
The identification of missed canals has been transformed by cone-beam computed tomography and the dental operating microscope. Traditional two-dimensional periapical radiographs superimpose root structures, making it difficult or impossible to distinguish a separate canal within a root that appears to contain only one. CBCT imaging eliminates this limitation entirely — axial slices at 0.1 to 0.2 mm intervals reveal the precise number, location, and curvature of every canal within every root. At Aloha Dental Specialty Center, we acquire CBCT scans in-office at the time of consultation, allowing our endodontic specialists to map the untreated anatomy before the procedure begins. During treatment, the operating microscope at 12x to 20x magnification reveals the canal orifice, which is often covered by a shelf of secondary or tertiary dentin. Ultrasonic tips (such as the Start-X series) are used to selectively remove this dentin without creating a perforation or gouging the pulp chamber floor. Once the orifice is uncovered, a size 06 or 08 hand file is pre-curved and gently introduced into the canal, confirmed with an electronic apex locator, and verified radiographically. This combination of three-dimensional imaging, microscopic visualization, and tactile expertise allows us to locate canals that were invisible during the initial treatment — and to do so conservatively, preserving the structural integrity of the tooth.
Why Choose a Specialist for Missed Canal Treatment?
Finding a missed canal requires three things that most general dental practices do not have: a dental operating microscope, in-office CBCT imaging, and years of specialized training in endodontic anatomy. Our endodontists completed rigorous residency programs that included extensive cadaver dissection, micro-CT anatomical study, and supervised clinical treatment of hundreds of cases with complex canal morphology. They understand the three-dimensional anatomy of every tooth in the mouth — not just the textbook descriptions, but the real-world variations that cause canals to be missed in the first place. The MB2 canal in upper molars, the middle mesial canal in lower molars, the bifurcating canal in lower premolars, the lingual canal in lower incisors — our specialists know where to look, how to access these canals safely, and how to negotiate them even when they are calcified or sharply curved. This specialized focus means we find and treat the anatomy that was the source of your persistent symptoms, giving your tooth the best chance of long-term survival without extraction.
Your Missed Canal Treatment Treatment Steps
- Consultation & Exam: Comprehensive missed canal treatment evaluation with CBCT 3D imaging at our Beaverton office.
- Treatment Plan: Board-certified specialist discusses your missed canal treatment options, timeline, and costs. Our procedures maintain a 95%+ success rate, backed by advanced 3D imaging and evidence-based protocols.
- Treatment: Procedure performed with comfort options including sedation if needed.
- Follow-Up: Post-treatment monitoring and care coordination for optimal healing.
Schedule Your Appointment Today
Book a consultation with our board-certified specialists at Aloha Dental Specialty Center in Beaverton, OR. Call (503) 822-0096 Office hours: Monday through Friday 7 AM to 7 PM, Saturday and Sunday 8 AM to 2 PM. or request an appointment online.
Related Services at Aloha Dental Specialty Center:
Dental Implants · Oral Surgery · Root Canal · Invisalign · Periodontics · Pediatric · TMJ Treatment · Sedation · Cosmetic · Emergency · Sleep Apnea
A Note from Your Dental Team
In my experience, the patients who get the best results from missed canal treatment are those who come in with realistic expectations and follow their post-treatment instructions carefully. I’d rather spend extra time explaining what to expect than have a patient be surprised later.
“Every patient I see has a different story, a different set of concerns, and a different definition of what ‘success’ looks like. That’s why I don’t believe in one-size-fits-all treatment plans. When you come in for a consultation, I’ll listen first, examine second, and recommend third.
I also won’t recommend a procedure you don’t need. If your tooth can be saved with a filling instead of a crown, I’ll tell you that. If watchful waiting is appropriate, I’ll explain why. My job isn’t to sell treatment — it’s to give you my honest clinical judgment so you can make an informed decision.
If you have questions about whether this treatment is right for you, or if you’ve been told you need this procedure by another dentist and want a second opinion, call us at (503) 822-0096. We’re happy to take the time to explain everything — no rush, no pressure.”
— Dr. Merat Ostovar & Dr. Jovan Gvozden | Aloha Dental Specialty Center, Beaverton, OR
I know many patients feel anxious about dental procedures — you’re not alone in that. What I hear most often after treatment is: “That was so much easier than I expected.” We’re here to make this as comfortable as possible for you.
Are You a Candidate for Missed Canal Treatment?
Most patients in good general health are candidates for missed canal treatment. However, certain factors may affect your eligibility or require modifications to the treatment plan:
- Medical conditions: Uncontrolled diabetes, autoimmune disorders, or blood-thinning medications may require coordination with your physician before treatment.
- Bone quality: For missed canal treatment involving the jawbone, adequate bone density is essential. A CBCT 3D scan during your consultation determines this precisely.
- Smoking: Tobacco use significantly impairs healing. We strongly recommend quitting 2-4 weeks before and after any surgical procedure.
- Age: There is generally no upper age limit. What matters is your overall health, not your age. We have successfully treated patients in their 80s and 90s.
The only way to know for certain is a consultation with our board-certified specialists. Call (503) 822-0096 to schedule your evaluation — we’ll tell you honestly whether this is the right treatment for your situation.
Typical Healing Timeline:
Days 1-3: Initial healing, mild swelling managed with ice and medication. Days 4-7: Swelling subsides, gradual return to normal diet. Weeks 2-4: Soft tissue heals completely. Months 2-6: Bone remodeling and full integration (for surgical procedures). Individual recovery varies — we provide detailed post-op instructions specific to your procedure.
For additional clinical information, visit the American Dental Association (ADA).
Last reviewed by our dental specialists: March 2026. Clinical information on this page reflects current evidence-based dental practices.
Frequently Asked Questions About Missed Canal Treatment
What is a missed canal?
A missed canal is a root canal within a tooth that was not identified, accessed, cleaned, or sealed during the original root canal procedure. The untreated canal continues to harbor bacteria, necrotic tissue, and biofilm, which sustain or cause periapical infection. Missed canals are the most commonly cited reason for endodontic treatment failure in published research. They are especially prevalent in teeth with complex anatomy, such as upper molars (MB2 canal), lower molars (middle mesial or second distal canals), and lower premolars (bifurcating canals).
How common are missed canals in root canal treatment?
Missed canals are more common than most patients realize. Research using micro-CT imaging shows that the MB2 canal is present in 90–95% of upper first molars, yet it is identified and treated in only 40–60% of cases performed without a microscope. Lower first molars harbor a middle mesial canal in approximately 15–25% of cases. Lower premolars have two or more canals in up to 25% of cases. When a general dentist performs a root canal without CBCT imaging and microscopic magnification, the probability of a missed canal increases significantly.
What symptoms indicate a missed canal?
Common symptoms include persistent or recurrent pain in a previously treated tooth, sensitivity to biting or pressure, swelling of the gum tissue near the root tip, a draining sinus tract (a small pimple-like bump on the gums), and a bad taste in the mouth. Some patients are asymptomatic, and the missed canal is discovered incidentally when a new radiograph or CBCT scan reveals a periapical radiolucency (dark area around the root tip) that was not present immediately after the original treatment.
How does CBCT help find missed canals?
Cone-beam computed tomography (CBCT) produces three-dimensional images of the tooth and surrounding bone, allowing our specialists to view axial cross-sections of each root at sub-millimeter intervals. Unlike traditional two-dimensional X-rays, which superimpose structures and can hide additional canals behind existing ones, CBCT reveals every canal within every root with exceptional clarity. We can see the exact location of the missed canal, its trajectory, whether it converges with or runs independently of the treated canal, and its relationship to the root apex. This information is critical for planning a safe, conservative access strategy.
What is an MB2 canal?
The MB2 (second mesiobuccal) canal is an additional canal found in the mesiobuccal root of upper first and second molars. Anatomical studies show this canal is present in 90–95% of upper first molars and 60–70% of upper second molars. It is located palatal to the main mesiobuccal canal (MB1), often beneath a shelf of dentin that obscures its orifice. When this canal is missed during the initial root canal, bacteria within it sustain periapical infection. Finding and treating the MB2 canal is one of the most common procedures we perform in missed canal retreatment cases.
Can a missed canal be treated without removing the existing root canal filling?
In select cases, yes. If the previously treated canals are well-obturated and the missed canal is the sole source of persistent infection, it may be possible to locate and treat only the missed canal without disturbing the existing filling material in the other canals. However, this decision depends on the quality of the original obturation, whether coronal leakage has occurred, and the overall condition of the root canal system. In many cases, we perform a complete retreatment — removing and replacing all existing filling material — to ensure the entire system is adequately disinfected and sealed.
How long does missed canal treatment take?
The appointment typically lasts 60 to 120 minutes depending on the tooth type, the number of missed canals, and whether a full retreatment is required. Posterior teeth with multiple roots and complex anatomy (such as upper molars with an MB2 canal and a possible second palatal canal) generally require longer appointments. If the missed canal is calcified or has a severe curvature, additional time may be needed for careful negotiation. We allocate sufficient appointment time to ensure thorough treatment without rushing.
Is finding a missed canal always possible?
In the vast majority of cases, our specialists can locate and treat missed canals using CBCT guidance and microscopic visualization. However, there are rare situations where a canal may be completely calcified (obliterated) and cannot be negotiated despite advanced techniques. In these cases, we discuss alternative treatment options, which may include endodontic microsurgery (apicoectomy) to address the pathology from a surgical approach, or monitoring with periodic imaging if the patient is asymptomatic. We provide an honest assessment of the likelihood of success before beginning treatment.
What teeth are most likely to have missed canals?
Upper first molars are the most common, primarily due to the MB2 canal. Upper second molars also frequently harbor an MB2 canal. Lower first molars may have a middle mesial canal or a second canal in the distal root. Lower second premolars have two canals in up to 25% of cases, and these bifurcations can occur deep within the root, making them especially easy to miss without CBCT. Lower anterior teeth occasionally have a lingual canal. Even upper premolars may have three roots and three canals instead of the expected two.
What causes a dentist to miss a canal during the initial root canal?
Several factors contribute: lack of microscopic magnification (the unaided eye cannot resolve structures smaller than 200 microns), absence of CBCT imaging for pre-treatment anatomical mapping, secondary dentin deposition that obscures canal orifices, unusual tooth anatomy, and time constraints during the procedure. General dentists are well-trained to perform standard root canal therapy, but the detection of accessory and supplementary canals often requires the specialized equipment and focused training that endodontic specialists possess.
Will I need a new crown after missed canal treatment?
If we access the tooth through an existing crown, the access opening will need to be restored. In many cases, a new crown is recommended to ensure a proper seal against coronal leakage. If the existing crown remains structurally sound and the margins are intact, a composite restoration of the access cavity may be sufficient. Your general dentist will evaluate the crown after our retreatment and recommend the appropriate restoration. We communicate our findings and recommendations directly to your referring dentist to ensure coordinated care.
What is the success rate for missed canal treatment?
When a missed canal is the primary cause of failure and it is successfully located, cleaned, and sealed, the success rate for retreatment is comparable to initial root canal therapy — approximately 85–95%. The prognosis depends on factors such as the size of the periapical lesion, the duration of the infection, the quality of the coronal seal, and whether additional complicating factors (such as a root fracture or perforation) are present. Our specialists provide a case-specific prognosis during your consultation based on the clinical and radiographic findings.
Does missed canal treatment hurt?
The procedure is performed under local anesthesia, and you should not feel pain during treatment. Our specialists use multiple anesthetic techniques to achieve profound numbness, including infiltration, block, and supplemental intraligamentary injections when needed. After the procedure, mild to moderate soreness is expected for two to five days, manageable with over-the-counter anti-inflammatory medications. Patients who had active infection before treatment may experience slightly more post-operative discomfort as the infection resolves, but this is temporary.
What are accessory canals?
Accessory canals are small lateral branches that extend from the main canal to the external root surface. They are found most commonly in the apical third of the root and in the furcation area of multi-rooted teeth. While they are too small to be instrumented directly, they are disinfected through chemical irrigation (sodium hypochlorite) and sealed by the obturation material during root canal therapy. Accessory canals that communicate with the periodontal ligament can sustain a combined endodontic-periodontic lesion if the main canal system is not adequately treated.
How do I know if I need missed canal treatment versus extraction?
The decision depends on the overall prognosis of the tooth. If the tooth has adequate remaining structure, no root fracture, and a missed canal that can be identified and accessed, retreatment is typically the preferred option. Preserving your natural tooth maintains bone volume, proprioception, and natural function. However, if the tooth has extensive structural damage, a vertical root fracture, or a combination of endodontic and periodontic pathology with a poor prognosis, extraction with implant replacement may be more predictable. We evaluate both options during your consultation and give you an honest recommendation based on the evidence.
Schedule Your Missed Canal Evaluation
If your previous root canal is still causing symptoms or your dentist suspects a missed canal, our endodontic specialists can perform a CBCT-guided evaluation to identify untreated anatomy and determine the best treatment path. Call today to schedule your consultation.
Clinically Reviewed by Dr. Merat Ostovar, DMD
Doctor of Dental Medicine | Implant & Specialty Dentistry | 15+ Years Experience
Aloha Dental Specialty Center — Serving Aloha, Beaverton, Hillsboro & Greater Portland
Last updated: March 19, 2026