What is inside a front tooth rebuilt with bonding?

What the drawing is measured from

1. The rebuild follows two principles from one textbook. The additive principle: in a direct restoration the etching and bonding are extended beyond the defect onto intact enamel, to blend and reinforce the restoration; its example is a small chipped edge restored without preparation: the tooth was etched, bonded and restored well beyond the fracture line under rubber dam. And natural guided stratification: a silicone index made from a wax-up or mock-up holds a palatal shell of enamel-like material, dentine-like increments are placed where the natural dentine was, and the last increment is the labial enamel. Magne and Belser 2022, Biomimetic Restorative Dentistry, volume 1, pages 319, 330 and 331.
2. Drawn as Dr. Khalid layers a chipped edge: a palatal shell against a silicone key made from a wax-up or mock-up of the agreed shape, then dentine shades where the tooth's dentine was, then a front enamel layer. The shell follows the drawing's own palatal enamel, as no published thickness exists for it, and the level and line of the break are illustrative.
3. Labial enamel thickness at 1, 3 and 5 mm above the cementoenamel junction: 0.48, 0.81 and 0.95 mm. Cone-beam CT of 1,600 maxillary central incisors in patients aged 18 to 40, Diagnostics 2024, PMC11592583. In agreement with micro-CT of 20 central incisors, which found a range of 0.461 to 0.966 mm. Enamel also thins significantly with age, so these are not lifetime values. DOI
4. Two things on this drawing are anatomically representative but are not taken from published measurements, and are therefore not labelled with a number: the palatal enamel profile, and the width of the pulp space. Only the labelled values are sourced.