Dental luting cement Bond Strength Strength Flow (viscosity) Wetting Film thickness (<25 microns ) Solubility Working,Setting time Esthetic *Complication

Dental luting Cement Zinc phosphate Polycarboxylate Glass ionomer RMGI cement Resin cement

Zinc phosphate Over 100 yrs of clinical experience Routine application Post-op sensitivities Low hardness High solubility pH No bond with tooth

Polycarboxylate Molecular bonding to tooth substance (2MPa) Cost Low F ¯ release Low post-op sensitivities Low hardness solubility

Glass ionomer Molecular bonding to tooth substance F ¯ release Cost-Eff. Minimal dimentional change Occa. post-op sensitivities Sensitive to water Limited application (ceramics) (High caries risk) (3-5MPa)

RMGI Molecular bonding to tooth substance F ¯ release Low solubility Fewer post-op sensitivities Application ? (ceramics,composite) (>10MPa)

Resin cement High adhesive quality (18-20MPa) ⇧ Retention High hardness Low solubility All metal, ceramic,composite (indirect) Occa. Post-op sensitivities

Adhesive quality Non-adhesive (zinc phosphate) Micromechanical bonding (resin cement) Molecular adhesion (polycarboxylate,GI,RMGI)

Dental Cement Zinc phosphate Polycarboxylate Glass ionomer RMGI cement Resin cement Conventional Adhesive

Advantage conventional cement Easy handling Moisture tolerance No pre-Tx steps Routine for metal base

Advantage resin cement Excellent mechanical properties High bond strength with pre-Tx step High aesthetics/translucency Suitable for Ceramic, Porcelain, Composite,Metal

Resin cement Matrix Primer Filler Coupling agent

Resin cement Matrix - Dimethacrylate Primer- Dicrylate Filler - Quartz, silica Coupling agent- Silane dimethacrylate

Resin cement Total etch Rely X ARC, Variolink II,Calibra,C&B Self-etch Panavia F Self-Adhesive Rely X Unicem

Adhesion Dentin/enamel (micromachanical bond) Porcelain (hydrofluoric acid,Ammoniumfluoride acid)+ silane Metal (sandblasting)(metal bonding adhesive) Fiber post

Adhesion Dentin/enamel (micromachanical bond) Porcelain (hydrofluoric acid,Ammoniumfluoride acid)+ silane Metal (sandblasting)(metal bonding adhesive) Fiber post

Adhesion Dentin/enamel (micromachanical bond) Porcelain (hydrofluoric acid,Ammoniumfluoride acid)+ silane Metal (sandblasting)(metal bonding adhesive) Fiber post

Adhesion Dentin/enamel (micromachanical bond) Porcelain (hydrofluoric acid,Ammoniumfluoride acid)+ silane Metal (sandblasting)(metal bonding adhesive) Fiber post

Why are fiber post? 1.Clinical success rate: Less root fracture than with metal posts: Dentine-like flexural strenght avoids the “ wedge ” effect of stiff and hard metal posts. root fracture! no local peak forces, no root fracture metal fiber post 2.Esthetics: the new post is translucent and does not shine through ceramic or composite restorations 3.Easy and conservative removal with drills if endodontic re-treatment is required further advantages: no corrosion, easy cutting of over-length, light-translucent...

Resin cement Bond strength > Zinc phosphate 10 times ↑ Retention Reinforced ceramic - base Crown Adhesive system (micromachanical bond-tooth) (chemical bond-porcelain,metal) Low solubility ↓ leakage

Pre-treatment procedure

Pre-treatment procedure

Pre-treatment procedure

Polymerization Light-cured/Dual cure (2 vials - Base,Catalyst) Self cure/auto cure Dual cure

Adhesion Dentin/enamel (micromachanical bond) Porcelain (hydrofluoric acid,Ammoniumfluoride acid)+ silane Metal (sandblasting)(metal bonding adhesive) Fiber post Adhesive cement bonding to tooth,alloy structure

Clinical Tips Anesthetic Isolate (pack cord) Light cure 2-3 sec Include 3-5 shades,silane Remove solvent- can inhibit setting of resin cement Excess bonding – poor fit,low strength Temp NE

Shade Opaque – veneer + Tetracycline Clear (translucent) Vita shade