(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
球形齿、楔形齿和勺形齿三维空间
模型；
,楔形(1) Geometry model of roller bit’s sphere tooth, wedgy tooth and bucket shape tooth were established;
（1）建立了牙轮钻头球形齿、楔形齿和勺形齿三维空间模型；
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
，切除标本经病理检查及免
证实；
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