A Posterior Composite Filling Is a Precision Restoration — Not a Quick Patch
Placing a composite filling in a back tooth is fundamentally different from filling a front tooth. Posterior teeth endure occlusal forces of 150 to 200 pounds per square inch during normal chewing — forces that can fracture a poorly placed composite within months. The cavity preparation is deeper, the margins are often below the gum line or under the contact point with the adjacent tooth, and moisture control is significantly more challenging in the posterior mouth. These factors combine to make posterior composite placement one of the most technique-sensitive procedures in restorative dentistry. At Aloha Dental Specialty Center, Dr. Ostovar applies the same meticulous approach to a posterior filling that he brings to a crown or veneer — because a filling placed correctly lasts a decade, while one placed carelessly leads to recurrent decay, cracked cusps, and eventually a crown.
The placement protocol begins with complete caries removal under magnification, using sharp carbide burs and hand instruments to selectively remove decayed dentin while preserving sound tooth structure. Our team then isolates the tooth — ideally with a rubber dam, or with cotton rolls and high-volume suction when a rubber dam is impractical — because composite bonding is extremely moisture-sensitive. Even microscopic salivary contamination during the bonding step can reduce bond strength by 50 percent or more. The cavity is treated with a multi-step adhesive system: acid etching of enamel to create micromechanical retention, followed by a dentin bonding agent that infiltrates the demineralized collagen matrix to create a hybrid layer. This hybrid layer is the mechanical link between the tooth and the composite — and its integrity determines whether the filling stays bonded for years or debonds and leaks within months.
The composite resin is placed in increments of 2 millimeters or less — a technique called layered placement — with each layer light-cured individually for 20 to 40 seconds depending on the shade and opacity. Layering is essential because composite shrinks approximately 2 to 5 percent by volume during polymerization, and curing a large bulk of composite at once creates internal stresses that pull the material away from the cavity walls, creating marginal gaps. By curing in thin layers, the shrinkage stress of each increment is managed before the next is applied. Our team sculpts the final occlusal anatomy to replicate the natural cusps, grooves, and marginal ridges — because proper anatomy is not just cosmetic; it directs food flow during chewing and prevents food impaction between teeth. The restoration is finished with fine diamond burs and polishing discs to create a smooth, glossy surface that resists staining and plaque accumulation.
Serving Beaverton, Aloha, Hillsboro & Washington County
Aloha Dental Specialty Center is located at 18455 SW Alexander St, Suite B, in Beaverton, Or Oregon. 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 dentists for their experience and predictable results.
We handle the complex phases and coordinate closely with your general dentist for seamless continuity of care from start to finish.
Office hours: Mon–Fri 8 AM–5 PM (Thu & Fri until 6 PM), Sat 8 AM–2 PM
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.
After Your Posterior Composite Filling
Composite fillings are fully functional immediately after placement. Here is what to expect in the hours and days following your appointment.
Same Day
The composite is fully cured and load-bearing at the time of placement. You can chew on the filling as soon as the local anesthesia wears off — typically within two to four hours. Avoid hard, crunchy foods directly on the filling for the first 24 hours while the adhesive bond matures to full strength.
Days 1 to 7
Mild sensitivity to cold and biting pressure is normal and typically resolves within a few days to one week. If the bite feels high — the filled tooth hits first when you close — call our office for a quick adjustment. A high spot left uncorrected can cause persistent pain and eventually damage the filling or opposing tooth.
Long-Term
Posterior composites can last 7 to 15 years depending on filling size, bite forces, and oral hygiene. Maintain regular brushing, flossing, and dental checkups. The composite surface can stain mildly over years, but professional polishing at hygiene appointments keeps it smooth and clean. Report any new sensitivity or roughness promptly.
Questions after your filling? Call us at (503) 822-0096. We are available for post-operative concerns.
Polymerization Shrinkage, Adhesive Dentistry, and Posterior Composite Longevity
Posterior composite restorations have undergone a dramatic evolution in material science. Contemporary nanohybrid and nanofilled composites achieve compressive strengths of 350 to 400 MPa and flexural strengths of 120 to 160 MPa — values that meet or exceed the functional demands of posterior occlusion. A landmark meta-analysis published in the Journal of Dental Research analyzing 12,238 posterior composite restorations reported annual failure rates of 1.8 percent, corresponding to a median survival time of 12.8 years — approaching the longevity traditionally associated with amalgam. The primary failure mode remains secondary caries at the restoration margin, which is directly related to the integrity of the adhesive bond. Polymerization shrinkage — the volumetric contraction that occurs as monomers cross-link into polymer chains — generates stress at the tooth-restoration interface that can exceed the bond strength, creating microgaps through which bacteria infiltrate. Incremental layering technique reduces the configuration factor (C-factor) and limits shrinkage stress per increment, while modern low-shrinkage resin formulations achieve volumetric shrinkage below 2 percent. Studies in Operative Dentistry confirm that selective enamel etching combined with universal adhesives applied in multiple coats produces bond strengths of 25 to 35 MPa to enamel and 15 to 25 MPa to dentin — values sufficient to resist the polymerization stresses generated during incremental placement.
Why Choose ADSC?
With advanced training in implant and restorative dentistry, Dr. Merat Ostovar brings careful, evidence-based technique to adhesive dentistry, direct composite placement, and the material science of resin-based restorations. Restoring teeth predictably takes precise technique and attention to bite and aesthetics, so he evaluates each posterior tooth in the context of the whole mouth — knowing when a filling is adequate, when an inlay or onlay provides better protection, and when a full-coverage crown is the only responsible option. He selects composite systems based on the specific cavity geometry: nanohybrid composites for large load-bearing restorations where wear resistance is critical, microfilled composites for proximal surfaces where polish and marginal adaptation are priorities, and bulk-fill composites for deep preparations where reduced layering time benefits the patient without compromising strength. This careful, case-by-case material selection is why his posterior composites hold up over time.
Your Composite Fillings Posterior Teeth Treatment Steps
- Consultation & Exam: Comprehensive composite fillings posterior teeth evaluation with CBCT 3D imaging at our Beaverton office.
- Treatment Plan: Our experienced dental team discusses your composite fillings posterior teeth options, timeline, and costs. We use advanced 3D imaging and evidence-based protocols across general dentistry, endodontics, and pediatric care.
- 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 team at Aloha Dental Specialty Center in Beaverton, OR. Call using advanced clinical protocols and evidence-based dental medicine(503) 822-0096 Office hours: Monday through Friday 8 AM to 5 PM (until 6 PM Thursday and Friday), Saturday 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 composite fillings posterior teeth 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.”
— 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 Composite Fillings Posterior Teeth?
Most patients in good general health are candidates for composite fillings posterior teeth. 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 composite fillings posterior teeth 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 experienced dental team. 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: March 2026. Clinical information on this page reflects current evidence-based dental practices.
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Frequently Asked Questions
Posterior composite fillings are tooth-colored restorations placed in the back teeth — premolars and molars. They are made of a resin matrix reinforced with glass or ceramic filler particles, creating a material that is both strong enough for chewing forces and aesthetically invisible. Unlike silver amalgam, composite bonds directly to the tooth structure, which means less healthy tooth needs to be removed during preparation.
Modern composite resins have compressive and flexural strengths that meet the demands of posterior occlusion. While amalgam is slightly stronger in pure compressive strength, composite has the advantage of bonding to tooth structure — meaning it reinforces the remaining tooth rather than just filling a hole. Published meta-analyses show median survival times of 12 to 13 years for posterior composites, which is clinically comparable to amalgam.
Not automatically. Our team recommends replacing amalgam fillings when they show clinical signs of failure — marginal breakdown, recurrent decay, cracks in the surrounding tooth structure, or fracture of the amalgam itself. Prophylactic replacement of intact, well-functioning amalgam fillings removes healthy tooth structure unnecessarily. Each filling is evaluated individually based on its clinical condition, not its age or material type.
Published research reports median survival times of 7 to 15 years, with the range depending on filling size, location, the patient’s bite forces, and oral hygiene. Small to medium fillings in premolars tend to last longer than large fillings in molars. Patients who clench or grind their teeth experience higher failure rates unless they wear a night guard. Proper placement technique — particularly moisture control during bonding — is the single most important factor in longevity.
Composite resin shrinks 2 to 5 percent by volume when it polymerizes under the curing light. If a large volume is cured at once, the shrinkage generates internal stresses that can pull the composite away from the cavity walls, creating microscopic gaps where bacteria enter and cause recurrent decay. Layering in 2-millimeter increments manages this shrinkage stress — each small layer contracts minimally and bonds firmly before the next is applied, building a restoration with tight, sealed margins.
No. The tooth is completely numbed with local anesthesia before any work begins. You will feel vibration from the handpiece and occasional water spray, but no pain. If you are anxious about dental procedures, nitrous oxide sedation is available to help you relax during the appointment. The procedure takes 30 to 60 minutes depending on the size and number of fillings being placed.
Posterior composite fillings typically range from $200 to $500 per tooth depending on the number of surfaces involved. A single-surface filling is the least expensive, while a four-surface filling approaching the need for a crown is the most. Most dental insurance plans cover composite fillings at 70 to 80 percent after deductible. We provide exact pricing before treatment and accept CareCredit and Cherry financing.
When the cavity involves more than 50 percent of the tooth’s biting surface width, or when three or more walls of the tooth are compromised, a direct composite filling may not provide adequate structural reinforcement. In these situations, an indirect restoration — an onlay or crown — is stronger and more predictable long-term. Our team makes this determination during the cavity preparation and discusses it with you before proceeding.
Composite resin can absorb surface stains from coffee, tea, red wine, and tobacco over time, though modern nanofilled composites are significantly more stain-resistant than older formulations. Regular professional cleaning and polishing during hygiene appointments keeps the surface smooth and removes superficial stain. In posterior teeth, minor staining is rarely noticeable since back teeth are not visible when you smile.
No. Composite fillings contain no mercury whatsoever. They are made of a BIS-GMA or UDMA resin matrix with glass, quartz, or ceramic filler particles. The mercury concern applies only to dental amalgam, which contains approximately 50 percent elemental mercury bound in a stable alloy. Composite is the mercury-free alternative, and it is the primary direct restorative material used at our practice.
A rubber dam is a thin latex or nitrile sheet that isolates the tooth being worked on from saliva, tongue movement, and cheek interference. For composite bonding, this isolation is critical — salivary contamination during the adhesive step can reduce bond strength by half and dramatically shorten filling lifespan. Studies consistently show that composite fillings placed under rubber dam isolation have significantly lower failure rates than those placed without it.
Most modern dental insurance plans cover composite fillings on posterior teeth at the same rate as amalgam. Some older plans may cover only up to the cost of an amalgam filling, with the patient paying the difference. Our insurance team verifies your specific coverage before treatment and explains any out-of-pocket costs clearly. This should not be a barrier — the difference, when it exists, is typically modest.
In some cases, yes. Small chips or marginal defects can be repaired by roughening the existing composite surface, applying fresh bonding agent, and adding new composite material. This is less invasive than complete replacement and preserves more tooth structure. However, if there is recurrent decay under the filling or the marginal seal is compromised around the entire restoration, complete replacement is the appropriate treatment.
Posterior fillings are technically more demanding. The cavity is deeper, the tooth anatomy is more complex with multiple cusps and grooves, access and visibility are limited, and moisture control is harder due to proximity to salivary glands. The layering protocol requires more increments in a deep posterior preparation than in a shallow anterior one. Additionally, restoring the contact point with the adjacent tooth on a back tooth requires a matrix band and wedge system that adds time to the procedure.
Call (503) 822-0096 as soon as possible. A lost filling exposes the inner tooth structure to bacteria, temperature, and mechanical forces. Avoid chewing on that side and keep the area clean. If the exposed area is sensitive, a small piece of sugar-free gum or temporary dental cement from a pharmacy can provide short-term protection until your appointment. A lost filling should be evaluated within one to two days to prevent further damage or infection.