Brinell hardness, cone impression hardness, ball impression hardness.
布氏硬度，锥体压痕硬度，球体压痕硬度。
Results There had difference on the surface smoothness and hardness of models made with different impression materials and different model materials.
结果不同印模材料采印及灌注的普通石膏模型，人造石和超硬石膏模型，其表面光滑度及硬度均有所差异。
Results There had difference on the surface smoothness and hardness of models made with different impression materials and different model materials.
结果不同印模材料采印及灌注的普通石膏模型，人造石和超硬石膏模型，其表面光滑度及硬度均有所差异。
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