单根牙近根尖1/3折断时，取根应采用的器械是

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29986' and id < 2429977 and id<>'2429977' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29986' and id > 2429977 and id<>'2429977' order by id asc limit 5