Temporary Crown Material Calculator
Bis-acryl or PMMA quantity from preparation dimensions.
About this calculator
Provisional (temporary) crowns protect a prepared tooth and maintain space and occlusion while a definitive restoration is fabricated. This calculator estimates the material volume needed per unit from a simplified shell model built around the preparation's height and diameter -- larger preparations need proportionally more material to build an adequately thick, strong shell around them. Material choice affects working characteristics much more than volume: bis-acryl (e.g.
Protemp-type) composites set relatively quickly with a short working time, making them the most common chairside choice for single units and short spans; PMMA (methyl methacrylate) acrylics have a longer working time and are often used for longer-span or more complex provisionals where extra time to shape and adjust matters; bis-GMA composites sit in between with generally higher flexural strength, useful for provisionals expected to stay in service longer. Cartridge counts assume standard dual-barrel automix cartridges with a waste allowance, since a meaningful fraction of dispensed material never makes it into the mold. These are planning estimates for chairside supply ordering -- actual consumption varies with technique, mold fit, and how much is trimmed away after set.
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
Total material volume (mL)
0.47
How to Use This Calculator
- Enter Preparation height (mm), Preparation diameter (mm), and Number of units.
- Select the Material type.
- Review the Total material volume (mL) result.
- Use Volume per unit (mL) and Working time (seconds) to inform your decision.
How the result changes with Preparation diameter (mm)
| Preparation diameter (mm) | Total material volume (mL) |
|---|---|
| 5 | 0.21 |
| 7.5 | 0.33 |
| 15 | 0.81 |
What each input means
- Preparation height (mm)
- Height of the crown preparation.
- Preparation diameter (mm)
- Average diameter of the preparation.
- Number of units
- Total number of provisional crowns needed.
- Material type
- Provisional material type.
What each result means
- Total material volume (mL)
- Total provisional material needed.
- Volume per unit (mL)
- Material volume per individual crown.
- Working time (seconds)
- Available working time before material sets.
- Setting time (minutes)
- Time to initial set.
- Material cost ($)
- Estimated material cost including waste.
- Provisional life (weeks)
- Expected service life of the provisional.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersPreparation height (mm) = 7, Preparation diameter (mm) = 10, Number of units = 1, Material type (1-3) = 1 = 4 input(s) provided
- Calculate Total material volumeTotal material volume0.47 = 0.47
- Calculate Volume per unitVolume per unit0.47 = 0.47
- Calculate Working timeWorking time90 = 90
Engine last updated . Checked against 2 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
Why does preparation diameter affect material volume more than the number of units?
The volume per unit here comes from the preparation's own height and diameter -- a wider or taller preparation needs a bigger provisional shell built around it. The number of units is a straightforward multiplier applied on top of that per-unit volume, so it scales the total but doesn't change how much material any single crown needs.
Does the material type change how much volume is needed?
No -- in this calculator, volume is purely a function of the preparation's geometry, not which material is selected. Material type instead changes working time, setting time, cost per milliliter, and expected flexural strength, since bis-acryl, PMMA, and bis-GMA composites differ in their handling properties and mechanical performance, not in how much space they need to fill.
Why is bis-acryl the most common choice for single provisional crowns?
Bis-acryl composites set relatively fast and can be dispensed directly from an automix cartridge with minimal chairside mixing, which suits the short working window typical of single-unit provisionals. PMMA's longer working time is often preferred instead for longer-span or multi-unit cases where more time to shape and adjust the provisional is valuable.
Why does the calculator add extra material beyond the raw computed volume?
Cartridge and total material cost figures build in a waste allowance on top of the raw computed volume, because dispensing automix material into a matrix or shell always loses some material to overflow, mixing tips, and trimming after set. Ordering supplies based on the raw volume alone would consistently under-estimate what's actually consumed chairside.
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