The long axises of miniature pigs teeth are 6 . 1 in the upper first molar , 6 . 5 in the lower first molar , 7 . 3 in the upper third premolar , 3 . 8 in the lower third premolar 结论小型猪咀嚼肌的形态、起止点、肌力方向都与人类有较大的相似性；第三前磨牙与第一磨牙长轴为近中倾斜，与人类第一前磨牙和第一磨牙近似。
Conclusion experimental miniature pigs should be introduced from animal subjects with low infection rate of pathogens and raised in a new environment before purification by caesarean section and confirmed to be microbiologically and parasitologically eligible 结论建议从异地引猪时应选择感染率低的小型猪，经剖腹净化、微生物检测合格后在新场进行饲养。
Inclination of upper and lower teeth long axis was studied with lateral xray film of mandibles . results the main masticatory muscles of miniature pigs include masseter muscle , temptory muscle , lateral pterygoid muscle , medial pterygoid muscle and zygomaticomandibular muscle 结果小型猪主要咀嚼肌包括嚼肌、颞肌、翼内肌、翼外肌及颧弓下颌肌；其中嚼肌方向与基准面夹角为63 . 9度，颞肌为114 . 55度，翼内肌为64 . 4度。
L . a total of 312 fetuses were collected from 27 wuzhishan inbreeding pigs ( wzsp ) and white minitype pigs to study the factors influencing the establishment of porcine embryonic germ cells , and we draw the following conclusions : ( 1 ) we can get embryonic fibroblasts from d26 - 28 fetuses ( day of first mating is day 0 , that is d 0 ) ; in this thesis , sto and mef1 were inactivated by incubation in medium containing 10 g / ml of mitomycin c for 1 . 75h ~ 2h ; while pef were inactivated by the same medium for 2 . 25h ~ 2 . 5h 本实验以中国近交系五指山小型猪( wzsp )和微型白猪为材料，先后从27头猪采集了312枚早期胎儿用于进行猪胚胎干细胞( eg )建系影响因素研究，得出如下结论： ( 1 ) d26 - 28猪胎儿可用于制作胎儿成纤维细胞。制作饲养层时， sto 、 mef ~ 1细胞用10 g ml丝裂酶素c处理1 . 75h 2h ； pef细胞用丝裂酶素c处理2 . 25h 2 . 5h 。
Ion objective : to investigate effect of nd : yag laser irradiating root canals on periapical tissue . methods : three minipigs were used in this study , deciduous premolars were opened , pulps were extracted , root canals were enlarged , then irradiated with nd : yag laser 30s and filled conventionally . the changes of periapical tissue were observed after 1 , 3 , 7 and 15 days . results : after one day , periapical tissue showed enlargement and engorgement of blood vessel and a few of leukocyte , the changes were more serious than in control . after 3 and 7 days , there were minor reactions in periapical tissue and same as the control group . after 15 days , periapical membrance in most specimens was normal . slight inflammatory reaction was found in the test group as same as in control group . conclusion : there was little damage to periapical tissue with the laser irradiation 目的:观察激光在根管内照射后对根尖周组织的作用.方法:选3只小型猪,全麻下将乳前磨牙开髓、抽髓,根管扩大后,激光照射30秒,做常规根管充填.对照组为常规根管充填. 1天、 3天、 7天和15天后观察根尖周组织的变化.结果:激光照射后1天,根周膜血管充血、轻度炎症,对照组只有根尖周膜充血.激光组组织反应比对照组稍重.激光照射后3天和7天,少数病例根周组织有轻度的刺激与对照组的病理表现相近.激光照射后15天部分标本根周膜正常,部分标本有轻度炎症反应,与对照组结果基本相似.结论:本激光照射条件对根尖周组织没有明显损伤作用,可供临床应用时参考
Objective in order to understand the microbial and paracitical infection status of experimental miniature pigs and prepare spf purification program of those animals , a microbiological and parasitological study was carried out on three chinese miniature gip species : beijing wuzhishan miniature pig , guangxi barns miniature pig and guizhou xiangzhu miniature pig 摘要目的为开展实验用小型猪spf净化工作，对北京五指山小型猪、广西巴马小型猪和贵州香猪进行微生物、寄生虫检测，以了解3个种群小型猪的微生物感染状况。
