プライマー塗布技術と残存象牙質厚は，模擬歯髄圧下における現代象牙質接着剤の微小引張接着強さに影響を与えた．

Primer application technique and remaining dentin thickness affected microtensile bond strength of contemporary dentin adhesives under simulated pulp pressure.

抄録

目的:

3種類の接着システムの微小引張接着強さ（μTBS）に及ぼす塗布技術，接着剤の種類，残存象牙質の厚みの影響を評価する．

OBJECTIVES: To evaluate the effect of application techniques, type of adhesives and remaining dentin thicknesses on microtensile bond strength (µTBS) of 3 adhesive systems.

材料と方法:

第3大臼歯の平坦な咬合歯面112面を，残存象牙質厚さ（RDT）2種類，塗布方法2種類，接着剤システム3種類（Optibond FL, OFL, Clearfil SE Bond, CSE, Single Bond Universal, SB）により16群にランダムに割り付け，SBはエッチアンドリンス（ER）とセルフエッチ（SE）で適用した．歯髄圧の模擬は，修復処置中および水中保管中に実施した．各歯のスティック状試験片は，μTBS試験を行った．データはpaired t testとANOVAを用い，post hoc testで評価した．また，破断した試験片は，実体顕微鏡を用いて破壊様式を評価した．

MATERIALS AND METHODS: 112 flat occlusal dentinal surfaces of third molar were randomly allocated into 16 groups based on 2 remaining dentin thicknesses (RDT), 2 application techniques, and 3 adhesive systems (Optibond FL, OFL; Clearfil SE Bond, CSE; and Single Bond Universal, SB); SB was applied in either etch-and-rinse (ER) or self-etch (SE) mode. Simulated pulpal pressure was performed during restorative procedure and water storage. The stick-shaped specimens from each tooth underwent µTBS testing. The data were evaluated using a paired t test and ANOVA followed by a post hoc test. The fractured specimens were evaluated for mode of failure using a stereomicroscope.

結果:

μTBSの平均値は，RDT，塗布技術，接着剤の種類に大きく影響された．RDTおよび塗布技術はERモードのSBのμTBSに影響を与えなかったが，塗布技術は従来型およびユニバーサルセルフエッチング接着剤のいずれにも影響を与えた．RDTはOFLのµTBSにも影響を与えた．

RESULTS: The mean µTBS values were significantly affected by RDT, application technique, and types of adhesives. Neither RDT nor application technique affected µTBS of SB in ER mode, whereas application technique affected both conventional and universal self-etch adhesives. RDT also influenced µTBS of OFL.

結論:

象牙質接着のμTBSは，RDTと塗布技術によって異なる影響を受け，製品との関連性が認められた．エッチアンドリンスシステムは表層象牙質に対する接着強度が深層象牙質よりも高く，セルフエッチシステムはRDTと塗布技術の両方に対してより敏感であった．

CONCLUSIONS: RDT and application technique differently affected the µTBS of dentin bonding which was product-related. Etch-and-rinse systems had higher bond strength to superficial than to deep dentin, whereas self-etch systems were more sensitive to both RDT and application technique.

臨床的関連性:

ユニバーサルアドヒーシブは、固有湿潤の影響を受けにくいので、メーカーの指示に従って使用することができます。

CLINICAL RELEVANCE: The universal adhesive is less sensitive to intrinsic wetness and can be used according to manufacturer's instructions.