Department of Prosthodontics and Periodontology, Piracicaba Dental School, State University of Campinas(UNICAMP), Piracicaba, SP, Brazil.
Department of Occlusion, Federal University of Santa Catarina(UFSC), Florianopolis, SC, Brazil.
Braz Dent J. 2021 Mar-Apr;32(2):64-71. doi: 10.1590/0103-6440202104143.
This study evaluated the dental displacement in dentures included in different flasks and processed by the Australian cycle modified or by microwave. Metal pins were placed on the teeth as reference for measurements: a) Incisal edge of maxillary and mandibular central incisors, buccal cusp of maxillary and mandibular vestibular first premolars, and mesiobuccal maxillary and mandibular cusps of second molars; b) Incisor to incisor, premolar to premolar and molar to molar; c) Left incisor to left molar and right incisor to right molar, and d) Vertical. Dentures were divided according to flasks (n=10): G1- Metal; G2- HH bimaxillary metal; G3-Microwaves; G4- HH bimaxillary microwaves. For G1 and G2, polymerization at 65ºC/30 min, flame quenched for 30 min, heating at 65ºC/30 min, boiling water for 1 h. For G3 and G4, microwave (20 min/140 W and 5 min/560 W). Comparator microscope with digital camera and analytical unit assessed the measurements before and after denture polymerization. The final distance was made subtracting the distance before the denture processing from the distance of the dental displacement after processing. The value of the difference was submitted to 2-way ANOVA, considering the flask type and denture type. Maxillary denture showed greater displacement when compared to mandibular denture. Flask types and interaction with denture types showed similar difference between before and after polymerization. In conclusion, displacement promoted by flask types in dentures cured by polymerization cycles promoted similar effect on the distance between teeth. Greater value for distance between teeth occurred for maxillary denture.
本研究评估了不同类型托盘及采用澳大利亚循环法改良或微波处理的义齿中的牙齿位移。在牙齿上放置金属销作为测量参考点：a）上颌和下颌中切牙切缘、上颌和下颌第一前磨牙颊尖、上颌和下颌第二磨牙近中颊尖；b）切牙到切牙、前磨牙到前磨牙和磨牙到磨牙；c）左侧切牙到左侧磨牙和右侧切牙到右侧磨牙；d）垂直向。根据托盘将义齿分为（n=10）：G1-金属；G2-HH 双颌金属；G3-微波；G4-HH 双颌微波。对于 G1 和 G2，在 65°C/30 分钟聚合，火焰淬火 30 分钟，在 65°C/30 分钟加热，沸水 1 小时。对于 G3 和 G4，微波（20 分钟/140 W 和 5 分钟/560 W）。带有数字摄像头和分析单元的比较显微镜用于评估义齿聚合前后的测量值。最终距离通过从义齿处理前的距离中减去处理后的牙齿位移距离来获得。将差异值提交给考虑托盘类型和义齿类型的双向方差分析。上颌义齿的位移大于下颌义齿。托盘类型与义齿类型之间的相互作用在聚合前后显示出相似的差异。结论：聚合循环中托盘类型引起的义齿位移对牙齿之间的距离产生了相似的影响。上颌义齿的牙齿间距差值较大。
