| 摘要 |
<p>The crown has a primary crown (1) provided with a male part (2), and a secondary crown provided with a female part. The male and female parts are designed as friction providing fasteners that are fit together. The primary crown and its male part and secondary crown and its female part are formed free of metal, and are entirely or partially formed from zirconia ceramics and/or polyamide plastic. A friction providing material mating consists of contact areas of the fasteners formed from ceramic and/or plastic.</p> |
