问卷调查显示覆盖义齿组固位程度和咀嚼力的优良率（80%；90%）高于对照组（40%；60%）。

The retention and mastication function of overdenture group (80%; 90%) were better than that of the control group(40%; 60%).

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结果表明，修复后牙齿外形美观，修复体稳固，具有一定的咀嚼力，成功率约为90%，是一种高效实用的修复方法。

The result show: its appearance is beautiful, stable and it has occlusal force. The success rate is 90%. It is an effective and practical method.

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也门人习惯咀嚼一种叫跨特的树叶，这种树叶是温和的兴奋剂，对清晰的思考和力本说没有助益，这个习惯几乎和以往一样普遍。

And the Yemeni habit of chewing a leaf called qat, a mild stimulant not conducive to clear thinking or dynamism, is almost as pervasive as ever.

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