curve of Spee leveling: Definition, Uses, and Clinical Overview

Posted on February 27, 2026 | by drdental

Overview of curve of Spee leveling(What it is)

curve of Spee leveling is an orthodontic approach used to flatten or reduce the natural front-to-back curvature of the biting surface.
It is most often discussed when planning deep-bite correction and full-arch alignment.
It can be performed with braces, clear aligners, or a combination of techniques.
The goal is to create a more balanced, stable bite relationship between the upper and lower teeth.

Why curve of Spee leveling used (Purpose / benefits)

The curve of Spee describes the gentle upward curve seen when viewing the lower teeth from the side: the front teeth often sit lower than the back teeth, creating a “smile-shaped” arc along the biting surfaces. In many people this curvature is mild and functions well. In others, it can be more pronounced and contribute to bite problems.

curve of Spee leveling is used because the shape of the lower arch (and how it meets the upper arch) can influence:

Overbite and deep bite tendency. A deeper curve can be associated with a larger vertical overlap of the front teeth (a deep overbite), which may increase front-tooth contact and wear in some patients.
Space and crowding management. Flattening the curve often changes how teeth sit vertically, which can affect available arch length and the way crowding is relieved. The extent of this effect varies by clinician and case.
Functional bite contacts. A more even occlusal plane (the plane formed by biting surfaces) can help distribute chewing forces across more teeth rather than concentrating contact in a small area.
Stability after orthodontics. Many orthodontic treatment plans consider curve of Spee leveling as part of achieving a stable finishing occlusion. Long-term stability still depends on multiple factors (growth, retention, habits), and outcomes vary by clinician and case.
Restorative and interdisciplinary planning. When a patient needs restorations (such as crowns, implants, or rehabilitation of worn teeth), the bite relationship and occlusal plane may be evaluated. Orthodontic curve of Spee leveling can sometimes be part of preparing for restorative work, depending on goals.

Importantly, curve of Spee leveling is not a “one-size-fits-all” objective. Some cases require only minor adjustment, while others require more extensive vertical and anteroposterior coordination between the arches.

Indications (When dentists use it)

curve of Spee leveling may be considered in situations such as:

Deep overbite where the lower front teeth are significantly “covered” by the upper front teeth
Class II Division 2–type patterns (a common deep-bite presentation) when the curve is pronounced
Lower-arch leveling and alignment as part of comprehensive orthodontic treatment
Uneven bite contacts with heavy contact on anterior teeth and limited posterior contact (varies by case)
Occlusal plane coordination before restorative dentistry in interdisciplinary cases (varies by clinician and case)
Relapse or re-treatment where the curve has re-developed after prior orthodontics
Bite opening needs during alignment to reduce interferences between upper and lower teeth (how this is done varies)

Contraindications / when it’s NOT ideal

curve of Spee leveling may be less suitable, delayed, or modified when:

The curve is mild and not contributing to symptoms or functional issues, and treatment goals do not require changing it
Active periodontal (gum) disease or reduced periodontal support is present, because certain tooth movements may need extra caution and individualized planning
Significant tooth wear, missing teeth, or compromised posterior support makes bite changes harder to predict without a broader restorative plan
Uncontrolled bruxism (clenching/grinding) is suspected, because forces may affect appliances, attachments, or bonded bite buildups
Temporomandibular disorder (TMD) symptoms are a concern; bite changes should be approached conservatively and individualized (management varies by clinician and case)
Poor oral hygiene or high cavity risk makes long-term fixed appliances or bonded additions more challenging
Growth-related changes are expected (in younger patients), because the bite can change over time and treatment timing may be adjusted

In many of these situations, curve of Spee leveling is not automatically “ruled out,” but the method, sequencing, and goals may differ.

How it works (Material / properties)

curve of Spee leveling is primarily about orthodontic biomechanics, not a single dental “material.” As a result, properties like flow and viscosity only apply when clinicians use bonded composite additions (such as bite turbos or bite ramps) to support the orthodontic plan.

Here is a high-level way to understand what “how it works” means in this context:

Biomechanics (the main concept)

Orthodontic curve of Spee leveling typically involves one or more of the following (often in combination):

Intrusion of anterior teeth (moving front teeth slightly “up” into the bone) to reduce deep bite
Extrusion of posterior teeth (bringing premolars/molars slightly “down” to increase posterior vertical dimension)
Incisor inclination changes (for example, controlled proclination or retroclination) that can influence how the curve presents clinically
Archwire or aligner staging designed to distribute vertical changes across the arch

The specific mix depends on diagnosis, facial pattern, anchorage considerations, and the appliance system used. Outcomes vary by clinician and case.

Flow and viscosity (only relevant for bonded adjuncts)

If bite turbos, bite ramps, or attachments are bonded with resin-based materials:

Flowable materials have lower viscosity, which can help adaptation to tooth surfaces and faster placement in small volumes.
More highly filled or “packable” materials are stiffer and may hold shape better for certain buildup designs.

Selection depends on clinician preference, material and manufacturer, and the intended use.

Filler content (relevant to resin-based adjuncts)

For resin-based composites used as temporary bite buildups:

Higher filler content generally relates to increased stiffness and wear resistance (exact performance varies by material and manufacturer).
Lower filler content can improve handling/flow but may wear faster in heavy contact areas (varies).

Strength and wear resistance (relevant to what contacts the opposing teeth)

curve of Spee leveling itself is not “wearing,” but any bonded bite opening material may be exposed to chewing forces. Materials with greater wear resistance may maintain the designed bite opening longer, but real-world performance depends on bite forces, diet, bruxism, and the specific product.

curve of Spee leveling Procedure overview (How it’s applied)

A complete curve of Spee leveling plan begins with diagnosis and ends with finishing and retention. The workflow below is a simplified overview for general understanding. Steps and sequencing vary by clinician and case.

Assessment and planning – Clinical exam, photographs, and bite analysis
– Records such as digital scans and radiographs, when indicated
– Defining whether leveling is achieved mainly through anterior intrusion, posterior extrusion, or a combination
Appliance setup – Braces (wires and brackets) or clear aligners (with planned staging), sometimes with auxiliaries
When bonded bite turbos/ramps or attachments are used, a common bonding sequence is: – Isolation (keeping the tooth surface dry and clean) – Etch/bond (conditioning enamel and applying adhesive) – Place (adding the composite buildup or attachment) – Cure (light-curing to harden the resin) – Finish/polish (smoothing and shaping to reduce roughness and optimize contact)
Monitoring and adjustments – Periodic checks to confirm the bite is opening/leveling as intended and to manage side effects (which vary by case)
Finishing and retention – Final bite refinement and retention planning to reduce relapse risk

This overview is informational and not a step-by-step guide for self-care or decision-making.

Types / variations of curve of Spee leveling

curve of Spee leveling can be achieved through different appliance systems and mechanics. Common variations include:

Braces-based leveling with archwire design
Continuous archwires that gradually align and level
Reverse curve of Spee lower archwires (commonly discussed in deep-bite mechanics)
Utility arches or intrusion arches (technique choice varies by clinician)
Clear aligner–based leveling
Staged movements that combine alignment with vertical correction
Attachments that help control extrusion/intrusion and tooth tipping
Bite ramps incorporated into aligner design in some systems (varies by system and clinician)
Use of bite turbos / bite ramps
Small bonded composite “stops” placed on selected teeth to open the bite and reduce interferences during leveling
Can also protect brackets/attachments from heavy contact in deep bite cases
TAD-assisted (temporary anchorage device) approaches
In selected cases, clinicians may use skeletal anchorage to improve control of intrusion or other movements
Indications and protocols vary by clinician and case
Material variations for bonded adjuncts (when used)
Low vs high filler composite for bite turbos/ramps (handling vs wear considerations; varies by material and manufacturer)
Bulk-fill flowable composite sometimes used for faster placement in thicker increments (performance varies by product)
Injectable composites used for efficient placement and shaping in certain workflows (varies)

Not every case needs bonded additions; many curve of Spee leveling plans rely primarily on orthodontic mechanics.

Pros and cons

Pros:

Can help reduce a deep overbite in cases where the curve contributes to the bite pattern
Often improves the ability to finish with more even tooth contacts across the arch
May support alignment and space management as part of comprehensive orthodontics
Can reduce interferences that complicate tooth movement in deep-bite situations (varies by case)
Works with multiple treatment systems (braces, aligners, hybrid approaches)
Can be integrated into interdisciplinary plans when restorative goals require bite coordination (varies)

Cons:

Treatment effects and stability depend on diagnosis, growth, habits, and retention (varies by case)
Some methods may cause temporary changes in chewing comfort during adjustment periods
Unwanted side effects are possible (for example, changes in tooth inclination or vertical dimension), requiring monitoring and refinement
Bonded bite turbos/ramps or attachments can chip or wear and may need maintenance (varies by material and bite forces)
Patients may notice short-term speech or eating adjustments, especially with bite-opening additions
In complex bites, achieving the planned occlusal contacts can take time and staged finishing

Aftercare & longevity

Longevity in curve of Spee leveling is less about a material “lasting” and more about how well the bite result is maintained over time.

Factors that can influence stability and maintenance include:

Bite forces and habits. Clenching/grinding can stress teeth, appliances, and any bonded bite additions, and may contribute to relapse tendencies in some patients.
Oral hygiene. Good plaque control supports gum health during orthodontic treatment and helps reduce risks around brackets, aligner attachments, or bonded composites.
Retention. Retainers are commonly used after orthodontic treatment to help maintain tooth positions. Retention plans vary by clinician and case.
Regular dental follow-up. Periodic exams help monitor tooth wear, gum health, and whether bite contacts are changing over time.
Material choice (when composites are used). Wear resistance, bonding reliability, and handling differ by product and manufacturer, which can affect how often repairs are needed.
Growth and aging changes. Teeth can shift throughout life, and the bite can evolve even after successful orthodontic treatment.

Because each patient’s bite and risk factors differ, expected durability and maintenance needs vary by clinician and case.

Alternatives / comparisons

curve of Spee leveling is one way to manage a deep bite or uneven occlusal plane, but it is not the only approach. Comparisons below are general and depend heavily on the diagnosis.

curve of Spee leveling vs leaving the curve unchanged
If the curve is not contributing to functional problems or treatment goals, a clinician may choose to preserve it.
When a deep bite or uneven contacts are present, leveling may be part of achieving a more balanced occlusion.
Braces vs clear aligners for curve of Spee leveling
Both can be used, and both may require auxiliaries (attachments, elastics, or bite ramps).
Predictability and efficiency vary by clinician experience, system design, and case complexity.
Bonded bite turbos/ramps: flowable vs packable composite
Flowable composite: easier adaptation and placement; may wear faster under heavy contact depending on product and bite forces.
Packable (more highly filled) composite: may resist wear better and hold shape; can be less “self-leveling” to place.
Performance varies by material and manufacturer.
Glass ionomer vs resin composite (for bonded bite additions in specific situations)
Glass ionomer can chemically bond to tooth structure and release fluoride, but may be less wear-resistant in high-contact areas (varies by product).
Resin composite often offers stronger wear properties and polishability; technique sensitivity (moisture control) can be higher.
Compomer (polyacid-modified resin composite) vs resin composite
Compomers sit between glass ionomer and composite in certain handling and fluoride-release characteristics.
For high-contact bite stops, clinicians often prioritize wear resistance and bonding reliability; suitability varies by product and case.
Restorative-only bite changes vs orthodontic leveling
In some situations, restorative dentistry can alter bite contacts (for example, through buildups or crowns), but that is a different philosophy than tooth movement.
Interdisciplinary planning is often important when significant wear, missing teeth, or bite collapse is present.

Common questions (FAQ) of curve of Spee leveling

Q: What is the curve of Spee, in simple terms?
It’s the natural front-to-back curve of the biting surfaces, most commonly described in the lower teeth. A deeper curve means the front teeth sit lower relative to the back teeth when viewed from the side. curve of Spee leveling aims to reduce that curvature when it contributes to bite or treatment concerns.

Q: Is curve of Spee leveling the same as fixing a deep bite?
They are related but not identical. A deep overbite can have multiple causes (tooth position, jaw relationships, growth pattern). curve of Spee leveling is one common component of deep-bite correction when the lower arch curvature is part of the problem.

Q: Does curve of Spee leveling hurt?
Orthodontic tooth movement can cause temporary soreness or pressure, especially after adjustments. If bonded bite turbos or ramps are used, chewing can feel different initially. The experience varies by person and by the mechanics used.

Q: How long does curve of Spee leveling take?
Timing depends on the amount of leveling needed and the overall orthodontic plan. Some cases see changes early, while others require longer staged correction and finishing. Duration varies by clinician and case.

Q: Will it change my facial appearance or smile?
It can influence how the teeth meet and how much the front teeth show, particularly in deep-bite cases. Most visible changes depend on the overall orthodontic goals (alignment, bite correction, arch coordination). The extent varies by case.

Q: Is curve of Spee leveling safe for enamel?
Orthodontic treatment is planned to move teeth within biological limits, but it requires monitoring and good hygiene to reduce risks such as decalcification around attachments or brackets. If composite attachments or bite turbos are bonded, proper technique helps protect enamel during placement and removal. Risks and benefits vary by clinician and case.

Q: Do bite turbos or bite ramps damage teeth?
They are designed to be temporary additions that help manage bite interference and mechanics. They can chip or wear, and they may feel bulky at first. When placed and removed appropriately, they are typically intended to be reversible, but outcomes vary by material, bite forces, and case factors.

Q: What affects the cost of curve of Spee leveling?
Cost is usually part of the overall orthodontic treatment fee rather than a separate line item. Factors include appliance type (braces vs aligners), treatment length, complexity, and whether additional procedures or repairs are needed. Fees vary by region, clinician, and case.

Q: Can adults get curve of Spee leveling?
Yes, adults commonly undergo orthodontic correction that includes curve of Spee leveling when indicated. Planning may consider periodontal health, existing restorations, and wear patterns. Treatment details vary by clinician and case.

Q: Will the curve come back after treatment?
Some relapse risk exists with any orthodontic movement. Retention, growth/aging changes, habits (like clenching), and how the bite was finished can all influence long-term stability. Long-term outcomes vary by clinician and case.