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fixed prosthodontics manufacturing cad/cam fixed partial denture crown bridge 7/8 crown pins and grooves endocow post and core overlay dental pin-ledge mouth preparation preliminary assessment oral surgery restorations endodontic orthodontic periodontic occlusion follow up history evolution hospitals healthcare 尘补谤颈蝉迟谩苍 ancient hospitals in islam hospitals in ancient rome greek first educational hospital meaning of hospital partial coverage restorations less is more inlay onlay occlusal veneer laminte veneer ceramics adhesive restorations vonlay half crowns cad on zirconia implants silica oating 3d printing scanning design milling additive subtractive three-axes milling four-axes milling five-axes milling dry field milling wet field milling fused deposition modeling selective electron beam laser powder forming inkjet selective laser sintering photopolymer jetting mrdical history dental history dental implan clinical examination abutment biologic width rehabilitation zirconia dental ceramics yttria-stabilized zirconia monolithic zirconia veneered zirconia transformation toughening stress-induced transformation monoclinic tetragonal low temprature degradation sintering layering press on steriolithography