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様々な着座力下における固定された上部構造金属表面への合着セメントのせん断接着強さ
Shear bond strength of luting cements to fixed superstructure metal surfaces under various seating forces.
PMID: 30370024 PMCID: PMC6202435. DOI: 10.4047/jap.2018.10.5.340.
抄録
目的:
本研究では，固定された上部構造の金属面に対する合着セメントのせん断接着強さ（SBS）を様々な着座力で検討した．
PURPOSE: In this study, the shear bond strengths (SBS) of luting cements to fixed superstructure metal surfaces under various seating forces were investigated.
材料および方法:
MATERIALS AND METHODS: Seven different cements [Polycarboxylate (PCC), Glass-Ionomer (GIC), Zinc phospahate (ZPC), Self-adhesive resin (RXU), Resin (C&B), and Temporary cements ((RXT) and (TCS))] were bonded to a total number of 224 square blocks (5×5×3 mm) made of one pure metal [Titanium (CP Ti) and two metal alloys [Gold-Platinum (Au-Pt) and Cobalt-Chrome (Co-Cr)] under 10 N and 50 N seating forces. SBS values were determined and data were analyzed with 3-way ANOVA. Pairwise comparisons and interactions among groups were analyzed with Tukey's simultaneous confidence intervals.
結果:
全体の平均値では，Co-Crが最も高いSBS値（1.96±0.4）（<.00）を示し，Au-Ptは試験したすべての金属の中で最も低いSBS値（1.57±0.4）（<.00）を示した．PCC/CP Ti，RXU/CP TiおよびGIC/Au-Ptの因子レベルの組み合わせ（<.00）を除き，10Nの着座力で試験したセメントは，50Nの着座力で試験したセメントと比較して，SBS値が有意に高くなることはなかった（>.05）．PCCセメントはSBSスコアの平均値が最も高く（3.59±0.07）（<.00）、レジン系仮着セメントRXTは最も低く（0.39±0.07）（<.00）であった。
RESULTS: Overall mean scores indicated that Co-Cr showed the highest SBS values (1.96±0.4) (<.00), while Au-Pt showed the lowest among all metals tested (1.57±0.4) (<.00). Except for PCC/CP Ti, RXU/CP Ti, and GIC/Au-Pt factor level combinations (<.00), the cements tested under 10 N seating force showed no significantly higher SBS values when compared to the values of those tested under 50 N seating force (>.05). The PCC cement showed the highest mean SBS score (3.59±0.07) among all cements tested (<.00), while the resin-based temporary luting cement RXT showed the lowest (0.39±0.07) (<.00).
結論:
ポリカルボン酸系セメントは，金属表面に対して信頼性の高い接着性能を有している．レジン系の仮着セメントは回収性が必要な場合に使用できる。GICは，CP TiやAu-Ptの下部構造からなる固定式歯科補綴物の永久接着には適していない。
CONCLUSION: Polycarboxylate cement provides reliable bonding performance to metal surfaces. Resin-based temporary luting cements can be used when retrievability is needed. GIC is not suitable for permanent cementation of fixed dental prostheses consisting of CP Ti or Au-Pt substructures.