成冠 chéng guān 成年。《北齐书·文苑传·颜之推》：“方幕府之事殷，谬见择於人羣，未成冠而登仕，财解履以从军。”
目的观察对比3 M预成冠用于修复乳磨牙缺损的临床疗效。
Objective to compare the result of 3m preformed crowns and Amalgam restoration of primary molars and to evaluate the clinical effect.
智成冠在20多岁时，曾有过两段恋爱史，但每次都很不幸的被对方“甩”。从此他不想再和别人约会，更别提结婚了。
Zhi, who dated seriously twice in his 20s but was sadly dumped each time, has no plans to date again, let alone get married.
智成冠在20多岁时，曾有过两段恋爱史，但每次都很不幸的被对方“甩”。从此他不想再和别人约会，更别提结婚了。
Zhi, who dated seriously twice in his 20s but was sadly dumped each time, has no plans to date aga let alone get married.
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