1. (1) Geometry model of roller bit’s sphere tooth, wedgy tooth and bucket shape tooth were established;
   （1）建立了牙轮钻头的球形齿、楔形齿和勺形齿三维空间的几何模型；
2. Partial gastrectomy was performed in four cases, distal gastric curative resection in one case, and local wedgy resection in one case.
   全部病例均经手术治疗，切除标本经病理检查及免疫组化证实；

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