患者，男，31岁。近2周前牙咀嚼疼痛，且牙龈肿胀有脓液流出，两年前该牙曾因龋坏而疼痛，未曾治疗。检查:残冠，近中邻颌面探及深龋洞，牙变色，叩诊有不适感，唇侧牙龈见一瘘管，有脓液溢出。X线片显示根尖有阴影。如用桩冠修复该牙，冠桩的长度和宽度分别为

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