Vallittu P K, Lassila V P, Lappalainen R
Department of Prosthetics and Stomatognathic Physiology, University of Kuopio, Finland.
Acta Odontol Scand. 1993 Dec;51(6):363-9. doi: 10.3109/00016359309040587.
The number of damaged dentures and type of damage to removable dentures repaired in dental laboratories was investigated using a questionnaire sent to 24 dental laboratories in Finland. Eight variables were examined for each damaged denture. The results showed that the type of dentures most commonly needing repair was the complete upper denture (49%). The most frequent type of damage was breakdown of the acrylic base and loosening of an artificial tooth. The chi-square test established a statistical dependence (p < 0.005) between damaged dentures and their age. Damaged upper partial dentures most frequently had natural teeth or fixed prostheses as antagonist teeth. Damaged lower skeletal dentures and acrylic partial dentures had a complete denture as the antagonist (p < 0.05). Removable dentures made of acrylic resin material seemed to break despite strengtheners, such as clasp wire.
通过向芬兰的24家牙科实验室发送问卷，调查了牙科实验室修复的可摘义齿的损坏数量和损坏类型。对每副损坏的义齿检查了八个变量。结果表明，最常需要修复的义齿类型是上颌全口义齿（49%）。最常见的损坏类型是丙烯酸基托断裂和人造牙松动。卡方检验确定了损坏义齿与其使用年限之间存在统计学相关性（p < 0.005）。损坏的上颌局部义齿最常以天然牙或固定修复体作为对抗牙。损坏的下颌支架式义齿和丙烯酸局部义齿以上颌全口义齿作为对抗牙（p < 0.05）。尽管使用了诸如卡环丝等增强材料，但由丙烯酸树脂材料制成的可摘义齿似乎仍会断裂。
