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游离端缺牙较其它部分缺牙的修复设计更为困难,要求更高,因游离端局部义齿只有单端基牙支持,如设计不当,义齿不易稳固,咀嚼功能差,还可能导致基牙损伤,齿槽萎缩,而使修复更加困难。这个问题已为多数学者所重视,进行了许多设计研究及改进,最有代表性的是Kratochvil于1963年提出,Krol等进一步肯定的RPI设计(即近中牙合支托,远中邻面板、Ⅰ型杆卡),Simmon于1960年提出,Becker等进一步改进的悬锁下设计等。然而游离端缺牙的具体情况较复杂,不仅缺牙数目不同,而且对颌情况,基牙及齿槽状况也不尽相同,因
Free end missing teeth than other parts of the missing tooth repair design more demanding and demanding, because the free end of the partial denture only single end abutment support, such as improper design, the denture is not easy to stabilize, poor chewing, but also may cause damage to the abutment , Alveolar atrophy, leaving more difficult to repair. This issue has been valued by most scholars and many design studies and improvements have been made. The most representative one is Kratochvil's proposal in 1963 that Krol et al affirmed the RPI design (ie, near-mid-occlusion, Ⅰ-type card), Simmon put forward in 1960, Becker and other further improvements under the design of the suspension. However, the specific situation of the free end of the missing teeth is more complicated, not only the number of missing teeth, and jaw conditions, abutments and alveolar conditions are not the same, because