Covers how an artificial crown is judged at three stages: on the die, on the master cast in the articulator, and in the mouth. Requirements are grouped under morphology, function, prophylaxis and aesthetics, with specific limits for strength and margins. A table pairs each check, such as margin, contacts, occlusion and colour, with the method used to test it, and a closing note explains why an open margin means remaking rather than repair.
Topic 37 of 75 in the MU Sofia syllabus for Preclinics of Dental Prosthetics (Dental Medicine, Year 2). The free AceMed note covers it in 6 sections, about 265 words (2 min of reading), with 15 flashcards.
In this note
Introduction
Morphologic requirements
Functional requirements
Prophylactic (biological) requirements
Esthetic requirements
How each point is checked
Introduction
A crown is judged three times: on the die, on the master cast in the articulator, and finally in the mouth. The same questions apply each time, grouped under the indices used to classify restorations: morphology, function, prevention and esthetics.
Morphologic requirements
Restores the natural anatomy of the tooth: its outline, cusps, ridges and grooves, scaled to the neighbours and the patient's age.
Contour follows the natural crest of curvature. An over-contoured (bulky) crown traps plaque and pushes on the gingiva; an under-contoured crown lets food strike the gingival margin.
Proximal contacts sit at the right height and are as tight as the neighbours' contacts.
Functional requirements
Occlusion in harmony with the opposing teeth and jaw movements: stable contacts in the intercuspal position, no premature contacts or interferences.
Forces directed along the long axis of the tooth.
Strength: thick enough not to fracture or wear through; for metal at least 0.5 mm, for ceramic 1–2 mm.
Good retention: it stays on under chewing forces.
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