What is minimal-prep veneer preparation?

Minimal-prep veneers are bonded after removing only 0.3–0.5 mm of enamel — less than the thickness of a contact lens. The preparation preserves the full enamel layer where possible, which improves bond strength (from ~20 MPa on dentin to ~30 MPa on enamel) and extends the long-term prognosis of the tooth by 5–10 years in published longitudinal studies.

Does ACE DNTL always use minimal-prep?

Wherever biology permits — yes, as the default. Three situations legitimately require deeper preparation: severe colour change requiring opaque masking, significant tooth re-positioning, or replacement of existing restorations. Each deviation is documented with a written reason in the clinical record. Across the published 100-case pilot dataset, 66 of 100 cases were delivered at minimal-prep or no-prep depth.

Why do some dentists remove more enamel?

Aggressive preparation is faster (10-15 minutes per tooth vs 30-45 for minimal-prep), more forgiving of laboratory error, and produces a thicker substrate that is easier to bond. These are operational advantages for the clinic. The cost — shorter long-term prognosis, weaker bond strength, exposed dentin sensitivity, fewer future treatment options — is borne by the patient.

Can a deeper-prepared case be revised back to minimal-prep?

No — once enamel is removed, it cannot be restored. This is the reason the original conservation decision matters. Cases that have been aggressively prepared can be re-treated with new restorations on European-standard quality (see /veneer-revision-european-standard), but the underlying tooth structure cannot be returned to its pre-treatment state. Earlier-stage cases (year 1-3 follow-up) have more revision options than late-stage cases (year 8+).

The 0.3mm Decision — When More Preparation Is Always Wrong

The contact-lens-thickness rule of thumb exists because tooth structure removed cannot be replaced. The case for going deeper has to be argued. The case for staying shallow defaults.

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Direct Answers

What is minimal-prep veneer preparation?: Minimal-prep veneers are bonded after removing only 0.3–0.5 mm of enamel — less than the thickness of a contact lens. The preparation preserves the full enamel layer where possible, which improves bond strength (from ~20 MPa on dentin to ~30 MPa on enamel) and extends the long-term prognosis of the tooth by 5–10 years in published longitudinal studies.
Does ACE DNTL always use minimal-prep?: Wherever biology permits — yes, as the default. Three situations legitimately require deeper preparation: severe colour change requiring opaque masking, significant tooth re-positioning, or replacement of existing restorations. Each deviation is documented with a written reason in the clinical record. Across the published 100-case pilot dataset, 66 of 100 cases were delivered at minimal-prep or no-prep depth.
Why do some dentists remove more enamel?: Aggressive preparation is faster (10-15 minutes per tooth vs 30-45 for minimal-prep), more forgiving of laboratory error, and produces a thicker substrate that is easier to bond. These are operational advantages for the clinic. The cost — shorter long-term prognosis, weaker bond strength, exposed dentin sensitivity, fewer future treatment options — is borne by the patient.
Can a deeper-prepared case be revised back to minimal-prep?: No — once enamel is removed, it cannot be restored. This is the reason the original conservation decision matters. Cases that have been aggressively prepared can be re-treated with new restorations on European-standard quality (see /veneer-revision-european-standard), but the underlying tooth structure cannot be returned to its pre-treatment state. Earlier-stage cases (year 1-3 follow-up) have more revision options than late-stage cases (year 8+).