The TiNi-shape memory alloy(SMA) distractor to increase alveolar ridge is pint-sized,easy-operated and full-insited,so it has wide foreground to be used in clinic.

• 本试验所用的钛镍记忆合金制作的牵张装置，体积小、完全埋置、手术简单、应用前景广泛。