curve of Spee: Definition, Uses, and Clinical Overview

Posted on February 26, 2026 | by drdental

Overview of curve of Spee(What it is)

The curve of Spee is the natural front-to-back curvature of the biting surfaces of the lower teeth.
It is described by imagining a line that follows the cusps (tips) of the teeth from the canine toward the back molars.
Dentists use it to understand how teeth meet (occlusion) and how the bite is balanced during chewing.
It is commonly referenced in orthodontics, prosthodontics, and restorative dentistry when planning bite changes.

Why curve of Spee used (Purpose / benefits)

The curve of Spee is not a dental material or a single procedure—it is an anatomical and functional concept used to guide diagnosis and treatment planning. Its main purpose is to help clinicians describe and manage how the upper and lower teeth fit together in a way that supports efficient chewing and stable contacts.

In practical terms, clinicians consider the curve of Spee to:

Assess bite balance: A very deep or very flat curve can be associated with uneven tooth contacts, which may affect how forces are distributed when biting.
Plan orthodontic tooth movement: Orthodontic treatment often involves “leveling” the curve of Spee to improve how the teeth interlock and to help address certain bite patterns (for example, deep overbite).
Design restorations that fit the bite: Crowns, fillings, and onlays need to match the patient’s occlusion. The curve of Spee provides a reference so restorations don’t feel “high” or interfere with chewing.
Set up dentures and full-arch prosthetics: In removable dentures and extensive reconstructions, recreating an appropriate curvature can support function and stability. (The ideal form varies by clinician and case.)

While people sometimes hear the curve of Spee discussed in the context of “fixing” the bite, it’s best understood as a measurement and guide—a way to describe the bite’s geometry so treatment can be planned more predictably.

Indications (When dentists use it)

Common situations where the curve of Spee is evaluated or referenced include:

Orthodontic assessments, especially when a patient has a deep bite or bite-related crowding patterns
Treatment planning for braces or clear aligners where leveling or maintaining the curve affects final bite contacts
Full-mouth rehabilitation planning (multiple crowns/onlays/implants) to coordinate the bite across the arch
Single-tooth restorations on premolars/molars where the restoration must match the existing occlusal curvature
Denture setup and other removable prosthodontic planning to establish stable chewing contacts
Occlusal analysis when evaluating tooth wear patterns and how bite forces may be distributed
Post-treatment checks to monitor stability after orthodontics or extensive restorative care

Contraindications / when it’s NOT ideal

Because the curve of Spee is a diagnostic concept rather than a product, “contraindications” mostly relate to when it’s not appropriate to change it or to focus on it in isolation.

Situations where modifying the curve of Spee may not be ideal, or where other priorities may come first, can include:

When the curve is discussed without a complete bite evaluation, since occlusion depends on many factors (jaw relationship, tooth alignment, restorations, and function)
When symptoms are attributed to the curve alone without considering other causes (varies by clinician and case)
When significant bite changes are proposed without stable records, such as accurate models/scans and jaw relationship assessment
When periodontal support is compromised, because tooth movement or bite alteration planning may need additional considerations (approach varies by clinician and case)
When there are complex jaw-joint or muscle concerns, where clinicians may prioritize a broader functional assessment rather than focusing on a single curve (evaluation varies by clinician and case)
When the existing bite is stable and functional, and changes could create new interferences if not carefully planned

In short: the curve of Spee is highly useful, but it is typically interpreted as one part of a larger occlusal picture.

How it works (Material / properties)

The curve of Spee is not a material, so properties like flow, viscosity, filler content, and curing do not directly apply.

Instead, the most relevant “properties” are geometric and functional:

Shape and depth (curvature): A “deeper” curve generally means the lower back teeth sit relatively lower compared with the front segment; a “flatter” curve is closer to a straight plane. How this interacts with the upper teeth can affect where contacts occur.
Force distribution: The curvature influences how biting forces may be shared across anterior (front) and posterior (back) teeth during chewing. The clinical significance varies by clinician and case.
Relationship to tooth positions: The curve reflects how teeth have erupted and settled over time, influenced by growth, wear, and function.
Compatibility with restorations and orthodontics: A restoration or tooth movement that ignores the existing curve can lead to a bite that feels uneven, requiring adjustments.

If the curve of Spee is being altered with restorative materials (for example, adding composite to change occlusal contacts), then material properties like wear resistance and filler content matter—but those are properties of the restorative material, not of the curve itself.

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

Clinicians don’t “apply” the curve of Spee the way they apply a filling. Instead, they evaluate, measure, and manage it during diagnosis and treatment planning.

A high-level workflow often looks like this:

Assessment and records: Clinical exam of bite and tooth contacts, often supported by photos and scans or impressions.
Bite analysis: Reviewing how the teeth contact in a natural bite and during jaw movements.
Treatment planning: Deciding whether to maintain, level, or re-establish the curve of Spee based on goals (orthodontic, restorative, or prosthetic).
Implementation: Orthodontic movement, restorative build-ups, selective adjustment, or prosthetic design—approach varies by clinician and case.
Verification: Checking contacts and comfort, and refining the bite as needed.

Where the “isolation → etch/bond → place → cure → finish/polish” sequence fits

That sequence is not a curve of Spee procedure—it is a typical workflow for placing tooth-colored resin restorations (composites). However, in some treatment plans, clinicians may use bonded restorations to help refine occlusal contacts that relate to the curve of Spee. In those situations, a simplified restorative workflow may include:

Isolation (keeping the tooth dry)
Etch/bond (preparing enamel/dentin for adhesion)
Place (adding restorative material to shape the biting surface)
Cure (hardening with a curing light, if applicable)
Finish/polish (refining shape and smoothing)

Whether restorations are used—and which technique is chosen—varies by clinician and case.

Types / variations of curve of Spee

The curve of Spee is commonly discussed in terms of how deep or flat it is and how it relates to the overall bite. Variations include:

Flat (shallow) curve of Spee: The occlusal line from front to back appears relatively straight. This may be seen in some natural bites or in certain treatment outcomes.
Average curve of Spee: A moderate curvature that supports typical intercuspation (how teeth fit together). “Average” varies by population and measurement method.
Deep curve of Spee: A more pronounced curvature, often discussed in relation to deep overbite patterns or certain alignment issues. Clinical implications vary by clinician and case.
Leveling of the curve: Orthodontic term describing reduction of a deep curve to a flatter form to improve bite relationships.
Reverse curve (in orthodontic mechanics): A term used to describe certain wire shapes or planned tooth movements aimed at counteracting a deep curve. Details and indications vary by clinician and case.
Compensating curves in prosthodontics: In complete dentures and some full-arch prosthetic concepts, clinicians may incorporate curvature to support balanced contacts during function. The chosen scheme varies by clinician and case.

When restorative “types” become relevant

If the curve of Spee is being managed through restorative reshaping (for example, rebuilding worn biting edges or occlusal surfaces), then material options may be discussed, such as:

Low vs high filler resin composites (often trading handling/flow for strength and wear resistance; performance varies by material and manufacturer)
Bulk-fill flowable composites (used in some posterior restorations; indications vary by manufacturer)
Injectable composites (a delivery approach used for certain additive reshaping techniques; suitability varies by clinician and case)

These are variations of restorative materials/techniques, not variations of the curve itself—but they may be used in treatments that influence occlusal curvature.

Pros and cons

Pros:

Helps clinicians describe bite relationships in a consistent, teachable way
Useful for orthodontic planning, especially when addressing deep bites
Supports restoration design so crowns/fillings match how the teeth function together
Relevant in full-arch and denture planning to coordinate chewing contacts
Encourages a whole-bite perspective rather than focusing on a single tooth
Can assist communication between clinicians, labs, and students using shared terminology

Cons:

It is only one component of occlusion and can be overemphasized if considered alone
Measurement and interpretation can vary by clinician and case
Changes to the curve (orthodontic or restorative) may require careful coordination to avoid creating new bite interferences
A “flatter” or “deeper” curve is not automatically good or bad; clinical significance depends on the individual
When extensive changes are planned, achieving stability can be complex and multifactorial
Discussions can be confusing for patients because it’s a concept, not a treatment you can “get done” in one visit

Aftercare & longevity

Since the curve of Spee is a feature of tooth position and occlusion, “aftercare” mainly relates to maintaining a stable, functional bite after orthodontic or restorative changes.

Factors that can influence long-term stability include:

Bite forces and chewing patterns: Heavy functional loads can contribute to wear or shifting over time.
Bruxism (clenching/grinding): Can affect tooth wear and the longevity of restorations that help shape occlusal contacts.
Oral hygiene and regular monitoring: Gum health and tooth support matter for long-term stability, and routine exams allow early detection of changes.
Retention after orthodontics: Retainers help maintain tooth positions; retention strategies vary by clinician and case.
Material choice and design (when restorations are involved): Wear resistance, fracture resistance, and how the restoration is shaped against the opposing tooth can affect durability (varies by material and manufacturer).
Existing restorations and missing teeth: Changes in support or contact points can affect how the occlusion settles over time.

Longevity is best thought of as bite stability over time, not a fixed timeline. Outcomes vary by clinician and case.

Alternatives / comparisons

Because the curve of Spee is a diagnostic reference, “alternatives” are better understood as other ways clinicians analyze the bite or other approaches to achieving a stable occlusion.

curve of Spee vs focusing on individual teeth

curve of Spee approach: Emphasizes how teeth relate across the arch from front to back.
Single-tooth focus: Useful for small restorations, but risks missing broader bite relationships if used alone.

Restorative comparisons (when occlusal reshaping is part of treatment)

If a clinician uses restorations to refine occlusion related to the curve of Spee:

Flowable vs packable (conventional) composite:
Flowable composites can adapt well to small areas but may have different wear resistance depending on filler content (varies by product).
Packable composites may offer different handling and may be selected for certain load-bearing areas (selection varies by clinician and case).
Glass ionomer:
Often discussed for fluoride release and moisture tolerance in certain situations, but may not be chosen for high-wear occlusal anatomy in all cases (varies by material and manufacturer).
Compomer:
Sometimes used in specific restorative scenarios; properties and indications vary by product and clinician preference.

Orthodontic vs restorative approaches

Orthodontic management: Moves teeth to change the curve of Spee and occlusal contacts.
Restorative management: Adds or reshapes tooth structure (with restorations) to harmonize contacts.
In complex cases, clinicians may combine approaches. The appropriate plan varies by clinician and case.

Common questions (FAQ) of curve of Spee

Q: Is the curve of Spee a dental problem?
Not by itself. The curve of Spee is a normal feature of how teeth are arranged. It becomes clinically relevant when its depth or shape is associated with bite goals, symptoms, or planned treatment (varies by clinician and case).

Q: Why did my dentist or orthodontist mention the curve of Spee?
They are likely describing how your lower teeth curve from front to back and how that affects your bite. It often comes up when discussing deep bite correction, planning restorations, or evaluating how evenly your teeth contact.

Q: Does changing the curve of Spee hurt?
The curve itself isn’t “treated” directly, but it can change as teeth move orthodontically or as restorations are adjusted. Sensations and comfort during treatment vary by clinician and case, and also depend on the type of procedure involved.

Q: Can the curve of Spee cause TMJ problems?
Jaw joint and muscle symptoms are typically multifactorial. The curve of Spee is one aspect of occlusion that may be considered during evaluation, but it is not a single proven cause of TMJ disorders on its own. Assessment and interpretation vary by clinician and case.

Q: How is the curve of Spee measured?
Clinicians may evaluate it on a clinical exam, on stone models, or using digital scans. Measurement methods can differ, and the “depth” considered significant depends on the overall bite and treatment goals (varies by clinician and case).

Q: Will braces or aligners change my curve of Spee?
They can, depending on the planned tooth movements and bite correction goals. Some plans aim to level a deep curve, while others aim to maintain it for function. The expected changes depend on the treatment plan.

Q: If I get a crown or filling, does it affect my curve of Spee?
It can, especially on premolars or molars where the biting surface contributes to the overall curvature. A properly contoured restoration is shaped to fit your existing occlusion so it doesn’t disrupt how your teeth meet.

Q: How long do results last if the curve of Spee is leveled?
Stability depends on retention, oral habits (including grinding), and the original bite pattern. Teeth can shift over time, which is why follow-up and retention strategies are commonly part of orthodontic care. Long-term outcomes vary by clinician and case.

Q: Is it safe to “raise the bite” to change the curve of Spee?
Bite changes can be planned in different ways, including orthodontic or restorative approaches. Safety and appropriateness depend on diagnosis, the amount of change, and the materials/techniques used. This is case-dependent and planned by a licensed clinician.

Q: How much does treatment related to the curve of Spee cost?
Costs depend on what is actually being done—orthodontics, restorations, dentures, or a combination. Fees vary widely by region, clinician, and complexity, so the most accurate estimate comes from an exam and a written treatment plan.

Q: Can I fix the curve of Spee at home?
No. The curve of Spee describes tooth positions and occlusal relationships that require professional evaluation to change safely. At-home attempts to alter bite contacts can create unintended problems, so clinicians generally rely on controlled, planned treatment when changes are needed.