Dental Cements
Dental Cements Acid-base rxn cements Resin-based cements
Phosphoric acid Organometallic chelate Polyalkenoic compound acid
Zinc phosphate ZOE Polycarboxylate Glass ionomer compomer
Silicate conventional composite
Zinc silicophosphate resin-modified
Cement | Composition | Setting rxn | Properties | Uses | Adv | Disadv | Zinc phosphate(ZP) | Powder: ZnOLiq: Phosphoric acid | 3Zn + 2H3PO4 Zn3(PO4)2 + H2O-s/f of ZnO dissolved by acid to give insoluble phosphate-set cement heterogenous (core of unreacted ZnO in a matrix of ZP) | 1. low film thickness2. high compressive strength3. low tensile strength4. sufficient thermal insulation5. may irritate pulp initially due to pH 2-46. acceptable solubility7. no chemical bond- non adhesive to enamel/dentine, depends on mechanical interlocking w/ rough s/f of cavity n restoration)8. opaque | -luting-liner | -high compressive strength-acceptable film thickness | -low initial pH lead to post-cementation sensitivity-no chemical adhesion-lack anticariogenic effect (no F-) | Silicate | Aluminosilicate glass powderAq sln of H3PO4 | *acid base rxn same as ZP-set material consists of cored s/t of unreacted glass particles sheathed by s/f gel, embedded in amorphous gel | 1. Very acidic2. highly soluble, leaky3. release F | No longer use | | | Silicophosphate | Powder: ZnO & aluminosilicate glass | Same rxn as silicate but w/ fmx of ZP | Release F | Rarely use now | | | ZOE | Powder: ZnO mainRosin brittleness Zn acetate acceleratorLiquid:Eugenol mainOlive oil viscosityAcetic acid accelerator | ZnO + 2 C10H12O2 Zn(C10H12O2)2+H2O-finer particles react faster-no rxn in absence of water | 1. neutral pH2. bacteriostatic3. obtundent4. low thermal diffusivity5. good electrical insulation6. kind to pulp7. adequate WT8. x adhere to enamel/dentine9. weakest mechanical properties10. highly soluble | -liner-temp restor-temp cement for tmp/per
Phosphoric acid Organometallic chelate Polyalkenoic compound acid
Zinc phosphate ZOE Polycarboxylate Glass ionomer compomer
Silicate conventional composite
Zinc silicophosphate resin-modified
Cement | Composition | Setting rxn | Properties | Uses | Adv | Disadv | Zinc phosphate(ZP) | Powder: ZnOLiq: Phosphoric acid | 3Zn + 2H3PO4 Zn3(PO4)2 + H2O-s/f of ZnO dissolved by acid to give insoluble phosphate-set cement heterogenous (core of unreacted ZnO in a matrix of ZP) | 1. low film thickness2. high compressive strength3. low tensile strength4. sufficient thermal insulation5. may irritate pulp initially due to pH 2-46. acceptable solubility7. no chemical bond- non adhesive to enamel/dentine, depends on mechanical interlocking w/ rough s/f of cavity n restoration)8. opaque | -luting-liner | -high compressive strength-acceptable film thickness | -low initial pH lead to post-cementation sensitivity-no chemical adhesion-lack anticariogenic effect (no F-) | Silicate | Aluminosilicate glass powderAq sln of H3PO4 | *acid base rxn same as ZP-set material consists of cored s/t of unreacted glass particles sheathed by s/f gel, embedded in amorphous gel | 1. Very acidic2. highly soluble, leaky3. release F | No longer use | | | Silicophosphate | Powder: ZnO & aluminosilicate glass | Same rxn as silicate but w/ fmx of ZP | Release F | Rarely use now | | | ZOE | Powder: ZnO mainRosin brittleness Zn acetate acceleratorLiquid:Eugenol mainOlive oil viscosityAcetic acid accelerator | ZnO + 2 C10H12O2 Zn(C10H12O2)2+H2O-finer particles react faster-no rxn in absence of water | 1. neutral pH2. bacteriostatic3. obtundent4. low thermal diffusivity5. good electrical insulation6. kind to pulp7. adequate WT8. x adhere to enamel/dentine9. weakest mechanical properties10. highly soluble | -liner-temp restor-temp cement for tmp/per