Implant Site Development Calculator
Ridge augmentation plan from defect classification.
About this calculator
Ridge augmentation planning starts from two measurements -- buccolingual ridge width and vertical ridge height -- each compared against a working target for a standard-diameter implant: roughly 7mm of width and 10mm of height to the nearest vital structure. This calculator subtracts the current measurements from those targets to get a width deficit and a height deficit, then recommends an approach from the combination: no grafting when both deficits are zero or negative, guided bone regeneration (GBR) with a membrane when the shortfall is moderate, and a block graft when either deficit is large.
Seibert's classification -- Class I for buccolingual (width) loss, Class II for apicocoronal (height) loss, and Class III for combined loss -- describes the SHAPE of the defect for case documentation, but it is not an input to the arithmetic here: this calculator reads the width and height measurements directly, so picking a different Seibert class while leaving the same width and height readings in place does not change the recommended procedure, graft volume, or timeline. Months since extraction feeds a separate ridge-resorption estimate, since alveolar bone continues to remodel after a tooth is lost -- the estimate grows with elapsed time and accelerates past the 12-month mark -- but it plays no role in the width deficit, height deficit, or augmentation-type calculations, which depend purely on the measured ridge dimensions.
Medical Disclaimer
This calculator is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about your health. Never disregard professional medical advice or delay seeking it because of results from this tool.
Inputs
Results
Augmentation type (0-3)
2
How to Use This Calculator
- Enter current ridge width (mm) and available ridge height (mm) from CBCT measurements.
- Select the Seibert defect class — I (width loss), II (height loss), or III (combined).
- Enter months since extraction to account for remodeling.
- Review Augmentation Volume needed, implant size compatibility, and treatment complexity.
- Use these results to plan grafting procedures before implant placement.
How the result changes with Ridge width (mm)
| Ridge width (mm) | Augmentation type (0-3) |
|---|---|
| 2 | 3 |
| 3 | 3 |
| 6 | 2 |
| 10 | 2 |
What each input means
- Ridge width (mm)
- Current buccolingual ridge width at the crest.
- Ridge height (mm)
- Available bone height to vital structures.
- Seibert class
- Seibert's classification describes the shape of the ridge defect, but this calculator's bone-removal math is driven by the measured width and height deficits above, not by the class label itself.
- Months since extraction
- Time since tooth extraction in months.
What each result means
- Augmentation type (0-3)
- 0 = none, 2 = GBR, 3 = block graft.
- Width deficit (mm)
- Buccolingual bone width shortage.
- Height deficit (mm)
- Vertical bone height shortage.
- Graft volume needed (cc)
- Estimated bone graft material volume.
- Total treatment time (months)
- Months from start to implant loading.
- Surgical procedures
- Number of surgical procedures required.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersRidge width (mm) = 4, Ridge height (mm) = 8, Seibert class (1-3) = 2, Months since extraction = 6 = 4 input(s) provided
- Calculate Augmentation type2 = 2
- Calculate Width deficitWidth deficit3 = 3
- Calculate Height deficitHeight deficit2 = 2
Engine last updated . Checked against 3 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.
Frequently Asked Questions
Does changing the Seibert class change the recommended augmentation?
No. This calculator determines augmentation type entirely from the ridge width and ridge height deficits you enter, not from the Seibert class selected. Class I, II, and III describe the SHAPE of the defect -- width loss, height loss, or both -- for case documentation, but the width and height numbers you measure clinically are what the recommendation actually reads.
Why does months since extraction matter if it doesn't affect the augmentation type?
Months since extraction only feeds the separate ridge-resorption estimate, which grows with elapsed time and is capped at 50%. It plays no role in the width deficit, height deficit, or augmentation-type outputs, which are computed purely from the ridge width and ridge height measurements you enter.
What ridge dimensions does this calculator treat as adequate for a standard implant?
The calculator targets about 7mm of buccolingual width and 10mm of height to the nearest vital structure as its baseline for a standard-diameter implant. Falling short of either triggers a width or height deficit, and the SIZE of that shortfall -- not merely whether one exists -- determines whether no grafting, guided bone regeneration, or a block graft is recommended.
Does a wider ridge deficit increase the estimated graft volume?
Yes. Reducing ridge width increases the width deficit, and the calculator's graft-volume estimate is built from the width and height deficits multiplied together, so a ridge falling further short of the 7mm width target needs a larger estimated volume of graft material, all else held constant.
Why does a block graft add more treatment time than guided bone regeneration?
Bone graft material needs time to mature and integrate with the native ridge before an implant can be safely loaded. This calculator adds roughly 6 months of healing for guided bone regeneration before the roughly 3-month implant-integration period, versus closer to 8 months for a block graft, which is reserved for larger deficits and is why those cases run noticeably longer from first surgery to a loaded implant.
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