Artificial Enamel : Preparation and Evaluation.

杂交牙本质的制备是树脂与牙本质结合的关键。本研究的目的是比较溶解在10%磷酸中的不同价阳离子对牙本质湿键的影响。假设在腐蚀剂中加入多价阳离子可以提高湿脱矿牙本质的单体渗透性，从而提高牙本质的结合强度。用溶解22.0mM氯化钠（Na）、氯化钙（Ca）或氯化铁（Fe）的10%磷酸蚀刻牛牙本质10s。将标本冲洗干净，然后用墨水擦干。用5% 4-META在丙酮中引物3次，共60 s。然后采用MMA-TBB树脂。从粘结试样中裁剪出迷你哑铃试样。通过与牙本质结合的研究发现，没有渗透树脂保护的脱矿牙本质很容易受到水解的影响，我们称之为继发性龋病。牙本质一旦被移除，牙本质就会暴露在外面，容易蛀牙，牙髓也会通过暴露在外的牙本质中的小管暴露在外面。微生物容易侵入牙髓；我们称之为超敏牙本质。微漏和继发龋是目前口腔医学亟待解决的重要问题。当我们可以在暴露的牙本质上提供一层像牙釉质这样的不渗透膜时，它必须非常有效地保护牙本质免受龋齿和牙髓免受微生物的入侵。

Preparation of hybridized dentin is a key to make bonding of resin to dentin possible. The purpose of this study was to compare efficacy of dissolved various valent cations in 10% phosphoric acid on wet bonding to dentin. It was hypothesized that addition of multivalent cation in etchant could improve the monomer permeability of wet demineralized dentin that would make the bond strength higher. Bovine dentin prepared with 600-grid paper was etched with 10% phosphoric acid dissolved 22.0mM sodium chloride (Na), calcium chloride (Ca) or ferric chloride (Fe) for 10s. The specimens were rinsed and blot-dried. They were primed with 5% 4-META in acetone for 60 s three times. And then a MMA-TBB resin was applied. Mini-dumbbell test specimens were trimmed from the bonded samples.Through a study of bonding to dentin it was realized that demineralized dentin not protected by interpenetration resin can easily be affected by hydrolysis, which we call secondary caries. Once enamel is removed, dentin is exposed to the outside and is vulnerable to caries, and pulp is also exposed to the outside through tubles in the exposed dentin. Then microorganisms invade the pulp easily ; this we call hypersensitive dentin. Microleakage and secondary caries have been very important problems to be solved in dentistry. When we can provide an impermeable membrane like enamel on the exposed dentin, it must be very effective to protect dentin from cariesand pulp from invasion of microorganisms.