Terminology and Classifications of Fixed Prosthodontics PDF

Terminology& Classifications of Fixed Prosthodontics By Dr. Enas Fathelbab Professor of Fixed Prosthodontics  Prosthesis Prosthodontics Fixed Prosthodontics  Prosthesis An artificial replacement of any part of the bod...

Terminology& Classifications of Fixed Prosthodontics By Dr. Enas Fathelbab Professor of Fixed Prosthodontics  Prosthesis Prosthodontics Fixed Prosthodontics  Prosthesis An artificial replacement of any part of the body, such as a leg, an ear or an arm. 3  Prosthodontics Is that discipline of dentistry concerned with restoring natural teeth or replacing missing teeth and contiguous oral and maxillofacial tissues with artificial prosthesis which may be removable or fixed. 4 ▪ Any material or appliance that restores or replaces lost dental/ oral structure 5 WHAT happened after tooth extraction ?????? WHY we need to restore the missing tooth????  The Goal ( Scope ) Function Health Esthetics  WHAT are the prosthetic options for replacing missing tooth????  Prosthetic Options Implant Removable PD Crown& Bridge  Fixed Prosthodontics Is that branch of dentistry that deals with restoring tooth or replacing missing teeth by artificial substitutes that are fixed in the mouth. i.e. the patient can not remove them.  Is the art and science of restoring damaged teeth with cast metal, metal ceramic or all ceramic restoration.  Restorations either; Restore a tooth (crown) or Replace a group of teeth (bridge). It may range from single tooth to complete rehabilitation. Single tooth restoration “Crown” Full mouth rehabilitation.  Removable Prosthodontics It is the field concerned with replacement of missing teeth and surrounding structure with artificial substitute that can be removed by the patient. Classification of Fixed Prosthodontics According to location: ﹡Intracoronal. ﹡Extracoronal. ﹡Intra-radicular (post crown). According to Area of Coverage: ❑ Full coverage. ❑Partial coverage. According to material: ﹡ Metallic. ﹡ Ceramo- metallic. ﹡ All ceramic. Intracoronal restorations Inlay : a metallic or ceramic restoration that restores the proximal and occlusal surfaces (MOD) but does not protect or cover the cusps. ▪Onlay : a modified MOD inlay with cusp overlays on the occlusal surface protecting the integrity of the remaining tooth structure. Intraradicular Restorations  Post crown An artificial restoration retained in position by a post inserted in the prepared root canal and then covered by a crown constructed on a metal or non metal core. Attached Dettached  Endocrown Single-piece restorations of endodontically treated teeth made of either composite or ceramic materials that partially or totally restore the coronal portion. They rely on macromechanical retention, achieved by anchoring the restoration within the pulp chamber’s internal portion and micromechanical retention using adhesive cementation. 32 Extracoronal Restorations 1. Crown 2. Bridges 3. Veneers Crown 37  Anatomical Crown Is part of the natural tooth that extend from the CEJ to the occlusal or incisal surface.  Clinical crown Is the part of the tooth that extends from the bottom of the gingival sulcus to the incisal edge or occlusal surface. It is the part of tooth which is visible in the mouth.  Radiographic Crown Is the part of natural tooth structure present above the crest of alveolar bone. Only viewed in radiograph. whereas, the part of the tooth embedded in alveolar bone below bone crest is called radiographic root.  Artificial crown Artificial replacement (restoration) to a single tooth, Which restores the anatomy, function and esthetics of the damaged coronal portion.  Classification of Extracoronal Restorations 1. According to Material 2. According to area of coverage 3. According to Mode of Retention 43  According to Material Metal Non-metal Combination According to area of coverage  Full coverage restorations ﹡ Extra-coronal restoration that covers all the surfaces of the prepared clinical crown. (buccal, lingual, mesial, distal & occlusal or the incisal)  ﹡ Veneered crown ﹡ Full Veneered crown ﹡ Full Veneer 47 Metal crown  According to Retention Completely Post Both encircling coronal tooth structure 48  Partial coverage restorations ﹡ They are conservative extracoronal restorations that cover just a portion of the clinical crown.  According to Retention Grooves Adhesion Pins 50  Three quarter ¾ crown Indicated in : upper anterior and posterior teeth Surfaces covered: all except Buccal/Labial Surface Means Of Retention: Proximal grooves  Reversed ¾ crown Indicated in : lower posterior teeth Surfaces covered: all except Lingual Surface Means Of Retention: Proximal grooves  Macboyle retainer It is a Modified ¾ crown Indicated in : lower anterior teeth & upper laterals Surfaces covered: all except labial Surface Means Of Retention: Labio- Proximal grooves  Mesial ½ crown Indicated in : mesially tilted posterior teeth Surfaces covered: half the buccal & half the lingual surfaces , mesial surface and Occlusal surface Means Of Retention: Buccal and lingual grooves  Seven eighth 7/8 crown Indicated in : Maxillary first molar Surfaces covered: all surfaces except the mesio-buccal cusp Means Of Retention: Buccal and mesial grooves.  Pin-ledge Indicated in : upper anterior teeth Surfaces covered: all except Buccal/Labial Surface Means Of Retention: Pins and ledges  Pin-ledge ﹡ Restorations use both ledges & pins to improve retention  Laminate Veneers ▪ They are thin esthetic facings made of ceramic directly bonded to etched enamel with a composite resin luting agents. Sometimes they are made of composite directly in patients mouth  Advantages of Partial coverage ﹡ 1. Preservation of tooth structure. ﹡ 2. More esthetic than full coverage restorations. ﹡ 3. The finish line is easy to place. ﹡ 4. Less periodontal irritation due to less contact with the tissues. ﹡ 5. Pulp damaged is reduced.  Disadvantages 1. Less retentive than the full coverage. 2. Difficultly of placing the grooves and pins properly. 3. Metal is displayed and this is not acceptable by the patient. Thanks! Any questions? 62