结果表明：假单胞菌、乳酸菌、热死环丝菌和肠杆菌是构成冷却羊肉初始菌相的主要微生物；
The results showed: Pseudomonas, Lactobacillus, Brochothix thermosphacta and Enterobacteriaceae were the main microorganisms in the chilled mutton;
四环素变色牙、釉质发育不全、死髓变色牙、牙体间隙及牙体缺损缺失等因素均能够影响牙体或牙列的功用和美观，后者在前牙区尤其突出。
Objective To compare the esthetic effect and the change of periodontal tissue in restoring anterior teeth with porcelain fused to metal crown and all ceramic crown.
四环素变色牙、釉质发育不全、死髓变色牙、牙体间隙及牙体缺损缺失等因素均能够影响牙体或牙列的功用和美观，后者在前牙区尤其突出。
Objective To compare the esthetic effect and the change of periodontal tissue in restoring anterior teeth with porcelain fused to metal crown and all ceramic crown.
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