Influence of polymerization mode of dual-polymerized resin direct core foundation systems on bond strengths to bovine dentin.
Influence of polymerization mode of dual-polymerized resin direct core foundation systems on bond strengths to bovine dentin.
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DOI：
10.1016/j.prosdent.2004.06.020
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发表时间：
2004-09
期刊：
影响因子：
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通讯作者：
Satoshi Oook;M. Miyazaki;Akitomo Rikut;B. Moore
中科院分区：
文献类型：
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作者：
Satoshi Oook;M. Miyazaki;Akitomo Rikut;B. Moore
问题陈述关于双聚合粘合剂和树脂核心基础糊剂的各种聚合组合如何影响牙本质粘结强度知之甚少。本研究使用牛牙本质检查了双聚合树脂直接核心基础系统的不同聚合模式对牙本质粘结强度的影响。材料和方法两种市售的双聚合树脂直接核心基础系统，Clearfil DC Core和UniFilCore，研究了将牛下颌切牙固定在自聚合树脂中，并在600粒度SiC纸上湿磨面部牙本质表面。牙本质表面根据制造商的建议进行处理，并应用双聚合粘合剂，并进行双聚合（对照）或仅进行化学聚合。将芯部基础树脂冷凝到模具（4 × 2 mm）中，并进行双重聚合或仅进行化学聚合。将80个试样（n=10）在37°C水中储存24小时，然后在万能试验机中以1.0 mm/min的十字头速度进行剪切试验。傅里叶变换红外光谱法被用来测量与两种聚合模式的双聚合树脂芯基础糊的转化度。进行了单因素和双因素方差分析、Tukey HSD检验和Student t检验（α= 0.05）。当粘合剂和树脂糊剂对两种芯基础系统进行双重聚合时，获得了最高的平均粘结强度（±SD）（Clearfil DC芯为14.6 ± 2.1 MPa，UniFil芯为15.6 ± 2.2 MPa）。双重聚合粘合剂和树脂糊剂的化学聚合导致粘合强度显著降低（Clearfil DC Core为2.8 ± 0.6 MPa，UniFil Core为8.1 ± 2.2 MPa）（P<0.001）。的树脂糊剂的转化程度显着下降（P<0.05）时，只有化学聚合，从81.5%至76.1%的Clearfil DC核心和86.7%至81.2%的UniFil Core. CONCLUSION数据表明，牙本质粘结强度的双重聚合树脂直接核心基础系统时，粘合剂和树脂核心糊剂双重聚合。
STATEMENT OF PROBLEMLittle is known about how various polymerization combinations of dual-polymerized adhesives and resin core foundation pastes affect dentin bond strength.PURPOSEThis study examined the influence of different polymerization modes of dual-polymerized resin direct core foundation systems on dentin bond strength using bovine dentin.MATERIAL AND METHODSTwo commercially available dual-polymerized resin direct core foundation systems, Clearfil DC Core and UniFil Core, were studied. Bovine mandibular incisors were mounted in autopolymerizing resin and the facial dentin surfaces were ground wet on 600-grit SiC paper. Dentin surfaces were treated according to manufacturer's recommendations, and dual-polymerized adhesives were applied and dual-polymerized (control) or only chemically polymerized. The core foundation resins were condensed into the mold (4 × 2-mm) and were also either dual-polymerized or only chemically polymerized. Eighty specimens (n=10) were stored in 37°C water for 24 hours, then shear tested at a crosshead speed of 1.0 mm/min in a universal testing machine. Fourier transformation infrared spectroscopy was used to measure the degree of conversion of dual-polymerized resin core foundation pastes with both modes of polymerization. One- and 2-way ANOVA, Tukey HSD tests, and Student t-tests were performed (α=.05).RESULTSThe highest mean bond strengths (±SD) were obtained when the adhesives and resin pastes were dual-polymerized for both core foundation systems (14.6 ± 2.1 MPa for Clearfil DC Core, 15.6 ± 2.2 MPa for UniFil Core). Chemical polymerization of dual-polymerized adhesives and resin pastes resulted in significantly lower bond strength (2.8 ± 0.6 MPa for Clearfil DC Core, 8.1 ± 2.2 MPa for UniFil Core) (P<.001). The degree of conversion for the resin pastes decreased significantly (P<.05) when only chemical polymerization was employed, from 81.5% to 76.1% for Clearfil DC Core and 86.7% to 81.2% for UniFil Core.CONCLUSIONThe data suggests that the dentin bond strengths of the dual-polymerized resin direct core foundation systems are highest when both adhesive and resin core paste are dual polymerized.