空心块茎环髓区细胞壁厚度比健康块茎的厚，而心髓区细胞壁厚度则比健康块茎的薄；
But outer pith cell of hollow center potato was bigger than that of normal one, and the cell wall was thicker. But the wall of pith cell was thiner than that of normal one.
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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