Rüttermann Stefan, Krüger Sören, Raab Wolfgang H-M, Janda Ralf
Heinrich-Heine-University, Medical Faculty, Centre of Dentistry, Department of Operative and Preventive Dentistry and Endodontics, Moorenstr. 5, Geb. 18.13, D-40225 Düsseldorf, Germany.
J Dent. 2007 Oct;35(10):806-13. doi: 10.1016/j.jdent.2007.07.014. Epub 2007 Sep 10.
To investigate the polymerization shrinkage and hygroscopic expansion of contemporary posterior resin-based filling materials.
The densities of SureFil (SU), CeramXMono (CM), Clearfil AP-X (CF), Solitaire 2 (SO), TetricEvoCeram (TE), and Filtek P60 (FT) were measured using the Archimedes' principle prior to and 15min after curing for 20, 40 and 60s and after 1h, 24h, 7 d, and 30 d storage at 37 degrees C in water. Volumetric changes (DeltaV) in percent after polymerization and after each storage period in water were calculated from the changes of densities. Water sorption and solubility were determined after 30 d for all specimens and their curing times. Two-way ANOVA was calculated for shrinkage and repeated measures ANOVA was calculated for hygroscopic expansion (p<0.05).
DeltaV depended on filler load but not on curing time (SU approximately -2.0%, CM approximately -2.6%, CF approximately -2.1%, SO approximately -3.3%, TE approximately -1.7%, FT approximately -1.8%). Hygroscopic expansion depended on water sorption and solubility. Except for SU, all materials showed DeltaV approximately +1% after water storage.
Polymerization shrinkage depended on the type of resin-based filling material but not on curing time. Shrinkage was not compensated by hygroscopic expansion.
研究当代后牙树脂基充填材料的聚合收缩和吸湿膨胀。
采用阿基米德原理测量SureFil（SU）、CeramXMono（CM）、Clearfil AP-X（CF）、Solitaire 2（SO）、TetricEvoCeram（TE）和Filtek P60（FT）在固化20、40和60秒后以及在37℃水中储存1小时、24小时、7天和30天后15分钟时的密度。根据密度变化计算聚合后及在水中各储存期后的体积变化百分比（ΔV）。在所有标本及其固化时间30天后测定吸水率和溶解度。计算收缩率的双向方差分析和吸湿膨胀率的重复测量方差分析（p<0.05）。
ΔV取决于填料含量而非固化时间（SU约为-2.0%，CM约为-2.6%，CF约为-2.1%，SO约为-3.3%，TE约为-1.7%，FT约为-1.8%）。吸湿膨胀取决于吸水率和溶解度。除SU外，所有材料在水储存后ΔV约为+1%。
聚合收缩取决于树脂基充填材料的类型而非固化时间。收缩未被吸湿膨胀补偿。
