User report – ParaPost ParaCore
The Monoblock Technique – a revolution in adhesive dentistry? Priv. Doz. Dr. med. dent. Stefan J. Paul
A composite cement with an integrated bonding system that can also be used as a core build up material has been a long-awaited dream in restorative denstistry. According to standard practice today, 3 to 4 different materials, which are often from different manufacturers, are required for bonding to dentin and enamel, fabricating composite core build ups, and adhesive cementation. Since modern composite materials in dentistry are still based on methacrylate, combining materials – for example, a bond from one manufacturer with the composite of another – is often not a problem. Nevertheless, it would be desirable to have one integrated system available.
as a core build up material (ParaPost ParaCore Automix 5 ml). A chemical curing dentin bonding agent, which is compatible with the material, is also available (ParaBond consists of a Non-Rinse Conditioner and Adhesive A & B, which requires mixing before application; and is why it is defined as a two-step bonding system). ParaBond and ParaCore can be used for: 1. adhesive cementation of a root canal post, 2. fabrication of a core build up, and 3. adhesive cementation of a permanent restoration. Coltène/Whaledent describes this time-saving application as the “Monoblock Technique.” The ParaBond/ParaCore System demonstrated excellent sealing against marginal microleakage, which indicates good to very good clinical viability 20.
Coltène/Whaledent has recently developed a dual-curing composite material that can be used as a cement as well
The Monoblock Technique is particularly suitable when light-transmitting, metal-free root canal posts are used with
Fig. 1: Preoperative clinical situation
Fig. 2: Sufficient root canal filling
Fig. 3: Shade selection by the dental technician
Fig. 4: Preoperative clinical situation with a latex rubber dam
Fig. 5: Preoperative clinical situation with a roeko rubber dam clamp for the anterior teeth
Fig. 6: Removal of the old restoration using a Diatech diamond FG 850L 016 12ML
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endodontically-treated teeth that will be fitted with a crown. Root canal posts provide greater retention of the core build up, and distribute masticatory forces along the interface of the residual tooth structure 3, 10, 17. The use of metal-free root canal posts prevent the greyish translucency at the gingival margin caused by the light reflexion from metal root canal posts. Publications regarding the use of root canal posts recommend that any further weakening of the residual tooth structure caused by the use of a post should be avoided as much as possible. Root canal posts are primarily indicated whenever there is over 50% loss of tooth structure. The smallest diameter of root canal post should always be used to ensure that there is no overloading of the abutment tooth by the final restoration 4 , 5, 13, 19 . From an esthetic point of view, prefer-