Dentin bonding is the most important procedure in modern composite resin restorative technology. Recently various socalled “the third generation dentin bonding systems” have been developed. Most of these systems are consisted of a dentin conditioner, a dentin primmer, and subsequent application of an adhesive resin bonding agent, and they can improve the adhesion and adaptability between the dentin surface and the composite resin restoration. However, there are many application steps in these bonding systems.
The tensile bond strengths between a composite resin and the human dentin surface promoted by seven commercial bonding systems were measured. The recently bonding systems promoted the adhesion superior to the second generation dentin bonding system.

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There have been active discussions on the need for informed consent in general medicine. The dental profession is also faced with an urgent need for the system of informed consent where treatment procedures, expected results, treatment fees, etc. are explained to a patient before treatment is started to gain his or her consent to the treatment.
One of the main objectives of dentistry is to restore occlusion. Sufficient explanations cannot be given to the patient with radiographs alone.
My clinic has a basic policy of making occlusal diagnosis in centric relation with study models mounted on a semi-adjustable articulator. With the use of mounted models, our patients can observe their occlusal conditions and underlying temporomandibular movement patterns which could not be observed otherwise.
The reproduction of prematurities and occlusal interferences on the mounted models serves to facilitate the process of obtaining a patient's informed consent.

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Porcelain has been used as one of the most reliable materials for dental restoration in many years. In earier modern dentistry, it is applied to artificial teeth set in the dentures and crowns, seated on the teeth as inlays and jacket crowns. Lately, although an invention brought a technique of ceramo-metal crowns, it remains to be solved about fracture of porcelain which is inadequately made or chosen.
In some such cases, they might be replaced with adequately made crowns on adequately prepared abutments, harmonised with respective occlusions. In some other cases which causes are considered as incontinuous accident, can be repaired by composite resin with treatment of silane coupling agent and adhesive that has recently acquired more stability.
The keys for successful repair are as follows:
1) Choose suitable cases. Larger or marginal exposure of metal reduces success rate.
2) Remove fractured part of porcelain completely.
3) Try to expose maximum hydroxide base on the surface of porcelain.
4) Beware of contamination with water.
5) Confirm the effectiveness of silane coupling agent.

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