Working Casts and IO Records PDF

Working Casts and Interocclusal Records aftertabefinalimproftatiandrytogetwohigan ormaircarlage Dr. Ahmed Aziz, BDS, MSD, PhD, FAAIP, FICOI Assistant Professor of Prosthodontics doffs caither Objectives mat t.it Identify the different types of dental gypsum materials. Differentiate between mo...

Working Casts and Interocclusal Records aftertabefinalimproftatiandrytogetwohigan ormaircarlage Dr. Ahmed Aziz, BDS, MSD, PhD, FAAIP, FICOI Assistant Professor of Prosthodontics doffs caither Objectives mat t.it Identify the different types of dental gypsum materials. Differentiate between models and dies and their ideal requirements. Distinguish between various types of working casts and die systems, their advantages and disadvantages. Identify various occlusal recording materials and their methods of applications. After taking nal impression of prepared teeth ( crown and bridge) you send it to lab to get master cast/ dental cast/ working cast ( all same name) awhole arch mastercast Master/Definitive cast A replica of the prepared teeth, ridge areas, and other parts of the dental arch isingletooth Die The positive reproduction of the prepared tooth of sufficient accuracy on which the margins of the wax pattern are finished Casting Making metal restoration The process by which crowns, inlays, and other metallic restorations are produced thihithmeirout J toget MLtotollon contentfinal crown I findbrida on be9ace needto impr IS_ The accuracy of a cast-and-die system is a function of the accuracy of the impression or optical capture. The cast can’t contain more information than the impression. Requirements Prerequisites for Casts 1 Exact reproduction of both prepared and unprepared surfaces, soft tissues and residual ridges mustbereplicated 2 All surfaces of teeth involved in anterior guidance and the occlusal surfaces of sal all unprepared teeth must allow for precise articulation labmustseeocclusal incisalsurfacesto great ensuing 3 All surfaces must be accurately duplicated no bubbles or voids 4 Area The remaining unprepared tooth structure immediately cervical to the finish line should be easily discernible on the die, ideally 0.5 to 1 mm 1st line finishline 2nd L from the FL gingivalmargin i l To help the technician establish the correct cervical The impression should extend beyond the preparation margin sifaking m why contour of the restoration to establish the 1L e Dimensional accuracy 2 Cast and die materials t castmustNotbeexpanded e of Q what are the types castgyptik's resin Resistance to abrasion we it wlpejft.EE Q Whatare thereq 3 itiiiwiEiiiiiiiii flex die materials Gypsum Advantages Q.whftgjf.sum Types • Inexpensive • Available in five forms, types I to V • Easy to use gypsum diestone • Type IV and type V reproduce acceptable surface • Produces consistent results details for fixed prosthodontics (20-μm) Preston pahne Disadvantage Poor resistance to abrasion 3 type Cast and die materials a WHILE Resin Types n Advantages Greater abrasion resistance than gypsum • Epoxy resin • Polyurethane resin Disadvantages • More expensive than gypsum expen expatial wkof inlab • Minor shrinkage during polymerization normalforram Flexible die materials Cast and die materials n Mmr Similar to heavy bodied silicone or polyether impression materials Used to make interim restorations, indirect composite resin inlays, and onlays chairside pour mntejtfnaini .mn Advantages • Rapid setting Disadvantages thatsw.mil4nhside • Ease of removal of the interim restoration II • More expensive than gypsum • Minor shrinkage during polymerization or inlay dwaboutitgypsmmit.mn one Summary 9 remain https://www.youtube.com/watch? v=psWzlG4rH3k&si=FtHybNSlbcE3eFQP watch ifyou forgotsteps Laboratory Steps of making Dies Store invacuummixersawidbubbb impr startstorb oneside on onlinwer slowlyoneaoffhesidt.to outoffas side peavelomryallen dullfonholt In'm Thinth innefeninsid ofmathcalth trimm red cinema 8 d burlomingdpitomb purpin Hlf inlidetok wipes tablettnk f smear forcattbe sasa die p r P purator even I Shyonban seaytotuteitout Maleinfo readywent tomakedie Ummapoor 4mancentrofhoh Sawin puton Choo lgbphgiet.frcar w redAnke worthdosawing action Ynmerwmprepn.m QYMnn.ge ifXopntonht from tech state adj townbewreibigg Depend tineadjustut even inveneeropen comet Martyn weed unclear Monk matemargin clear Alignment No undercut Sawinparnleon Trimming tonnage Interocclusal Records Maximum Intercuspation (MI) relatedto tooth IMI's The complete intercuspation of the opposing teeth, independent of condylar position Centric Relation (CR) related to condyle 1 respective disks, with the condyle-disk complex in the anterosuperior position against the articular eminences The maxillomandibular relationship in which the condyles articulate with the thinnest avascular portion of their centricrelation is This position is independent of tooth contact MI may or may not be coincident with the CR position when d Canine guidance 4 move man one Group function to side the contact will be on Uflkg's in beon its99.9.8scan Interference Tenteffersin oknFws Q whatsthe Conformative occlusion A restoration is made to conform to the patient’s existing occlusion 2 In many patients who need one or two single crowns or FDP No premature contacts should occur on the new restoration Reorganized occlusion Reorganizing patient’s occlusion means making CR coincide with MI before the fabrication of the restoration Occlusal adjustment of the existing dentition by selective reshaping and reorganization of the anterior (incisal) guidance before tooth preparation SIGNS: indications • Wear facets flatteethocclusally • Widened PDL spaces • Tooth mobility • Elevated muscle tone and muscle tenderness Facebow Record step1 3 Elastomeric Material Egof is usedfor Bite Registration E Materials PVS Forbite Registration materials Elastomeric PVS hard basffete Lake wax Resin print pound setwind an getMP amount platinet acrylic for cases big stable begat sincethere's be several crowns not affected by v neat rigid Hard baseplate wax Und heh pis Aluwax for bite Acrylic resin set once doesn't change notaffectedbyheat doesn'tbend for big case we we mum w ftp CXPVS need stable AfterMounting Maxilla theregisteredbite we put Mounting Mandibular Cast l o man put bitep Stablite it VIRTUAL DEFINITIVE CAST-AND-DIE SYSTEMS Could bedoredigitally lab scan can somimpr Rpowit our model I digitecair design convimpr labia Milton Runnin idiyrhyambre Men putblounterirmill block find resto ordyman Chain'd it funny Avonviper xpyouxpus Scan build one build ou come build proxime mm Design can put Mill 25 30min done implant sameday Reference Chapter 17