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レジンセメントの象牙質への接着:接着促進剤、即時象牙質封鎖戦略、および表面コンディショニングの効果
Adhesion of resin cement to dentin: effects of adhesive promoters, immediate dentin sealing strategies, and surface conditioning.
PMID: 30714054
抄録
目的:
本研究では、4種類の即時象牙質封鎖(IDS)戦略と2種類の表面調整(SC)法を組み合わせた2種類の接着剤(A)システムを塗布した後のレジンセメントの象牙質へのせん断接着強さ(SBS)を評価した。
PURPOSE: This study evaluated the shear bond strength (SBS) of resin cement to dentin after applying two adhesive (A) systems with a combination of four different immediate dentin sealing (IDS) strategies, and two surface conditioning (SC) methods.
材料と方法:
ヒト第三大臼歯(n=140)を採取し、2つのAシステム(クリアフィルSEボンド;クラレ[AC]およびオプティボンドFL;カー[AO])の間で無作為に分割した(n=各70)。A群をさらに4つのIDS戦略(2×1粘着層(IDS-1L);2×2粘着層(IDS-2L);2×1粘着層および1流動層(IDS-F);2×2粘着層なし(遅延型象牙質封鎖[DDS]))に分けた。最後に,DDS群を除き,SC-Pのみを使用したDDS群を除き,2種類のSC法(軽石のみ[SC-P]または軽石とシリカのコーティング[SC-PS])のいずれかに分類した.これにより、各10本の標本を14群に分けた。各臼歯冠から咬合冠第3位をダイヤモンドソー(Isomet 1000)で除去し、IDSを適用した後、一時的な修復を行った。これらは2週間の水保管後に除去され、IDSの表面はその後調整された。標準的な接着手順(Syntac Primer and Adhesive, Heliobond; Ivoclar Vivadent)を実行し、続いてレジンセメント(Variolink II; Ivoclar Vivadent)を塗布し、光重合を行った。全ての試験片を熱環式エージング(10,000サイクル、5℃〜55℃)を行った。万能試験機(1mm/min)で接着界面にせん断力を加えた。負荷後の破壊の種類と場所を分類した。データは分散分析(ANOVA)および独立標本のt検定を用いて解析した.
MATERIAL AND METHODS: Human third molars (n = 140) were collected and randomly split (n = 70 each) between the two A systems (Clearfil SE Bond; Kuraray [AC] and Optibond FL; Kerr [AO]). The A groups were further divided into four IDS strategies (2 x one adhesive layer (IDS-1L); 2 x two adhesive layers (IDS-2L); 2 x one adhesive layer and one flowable layer (IDS-F); 2 x no adhesive layer (delayed dentin sealing [DDS]). Finally, each strategy group was categorized into one of the two SC methods (only pumice [SC-P] or pumice and silica coating [SC-PS]), except the DDS group, where only SC-P was used. This resulted in 14 groups of 10 specimens each. The occlusal coronal third was removed from each molar crown with a diamond saw (Isomet 1000), and IDS was applied, followed by temporary restorations. These were removed after 2 weeks of water storage, and the IDS surfaces were subsequently conditioned. The standard adhesive procedure (Syntac Primer and Adhesive, Heliobond; Ivoclar Vivadent) was executed, followed by the application of a resin cement (Variolink II; Ivoclar Vivadent) and photopolymerization. All specimens were subjected to thermocyclic aging (10,000 cycles, 5°C to 55°C). Shear force was applied to the adhesive interface in a universal testing machine (1 mm/min). Fracture types and locations after loading were classified. The data were analyzed using analysis of variance (ANOVA) and independent samples t tests.
結果:
AO群はAC群(12.85±4.97)よりも高い平均SBS値(14.4±6.43)を示した(P = 0.03)。ANOVAは、異なるグループのSBSに対するアプリケーションの主な効果を示した(P = 0.00)。両DDS群は、すべてのIDS群(IDS-1L、IDS-2L、IDS-F)と比較して、有意に低いSBS値を示した。SBSの結果には、IDS群間(P = 0.43)とSC法間(P = 0.76)で有意差は認められなかった。IDSの適用により,象牙質とセメントの界面破壊は減少した.
RESULTS: AO groups exhibited higher mean SBS values (14.4 ± 6.43) than AC groups (12.85 ± 4.97) (P = 0.03). ANOVA showed the main effect of the applications on the SBS in the different groups (P = 0.00). Both DDS groups showed significantly lower SBS values compared with all the IDS groups (IDS-1L, IDS-2L, IDS-F). No significant differences in SBS results were found between the IDS groups (P = 0.43) and between the SC methods (P = 0.76). Dentin-cement interface failures diminished with the application of IDS.
結論:
IDSはDDSと比較してSBSを改善した。試験した条件付け法の間に有意差は認められなかった。
CONCLUSION: IDS improves the SBS compared with DDS. No significant differences were found between the tested conditioning methods.