crown = mahkota gigi, yaitu bagian gigi yg ditutupi lapisan email.
Namun demikian, dalam konteks ini yg dimaksud
crown = mahkota gigi buatan (bukan mahkota gigi alami)

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Note added at 1 hr (2008-06-24 11:08:58 GMT)
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Harty, FJ & Ogston, R. 1995. Kamus Kedokteran Gigi. Penerjemah drg. Narlan Sumawinata. Jakarta: EGC.


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Note added at 1 hr (2008-06-24 11:18:51 GMT)
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Rujukan 1 berikut ini untuk konfirmasi "mahkota gigi alami" dan Rujukan 2 untuk "mahkota gigi buata."
1. In dentistry, *crown* refers to the anatomical *area of teeth, usually covered by enamel.* The crown is usually visible in the mouth after developing below the gingiva and then erupting into place.

2. In dentistry a *crown* can also refer to a *metal or porcelain device placed over the tooth* to prevent further tooth decay and its structures underneath as well as to provide functionality for that tooth.
http://en.wikipedia.org/wiki/Crown_(tooth)

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Note added at 1 hr (2008-06-24 11:28:36 GMT)
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Gigi berlubang yang tak bisa ditangani melalui penambalan gigi akan direhabilitasi melalui pemasangan pasak gigi disertai *mahkota gigi buatan* (*crown*) diatas akar gigi.
http://www.tribunkaltim.com/Balikpapan/Tak-Perlu-Operasi-Cab...

Gigi keropos yang saraf-sarafnya sudah mati bisa diperbaiki di sini: diterapi saraf-sarafnya, lalu di-*crown* atau dilingkungi *mahkota gigi buatan.*
http://warastuti.blogspot.com/2005_12_01_archive.html