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Follow the links below to find material targeted to the unit's elements, performance criteria, required skills and knowledge

Elements and Performance Criteria

1. Prepare removable stone die
   • Pour-up die stone horseshoe
   • Grind base of die stone to appropriate height and with level occlusal plane
   • Trim away undercuts from base of die stone model
   • Prepare die model for dowel pin and base in accordance with manufacturer's instructions
2. Duplicate model
   • Prepare materials to duplicate models in accordance with manufacturer's instructions
   • Mix stones, die-stones and refractories in accordance with manufacturer instructions
   • Produce an accurate, bubble free duplicate model
3. Wax and invest fixed partial dentures and structures
   • Wax up crown and bridge restorations
   • Sprue crown and bridge wax pattern and prepare for investing
   • Select appropriate investment material according to the alloy to be used
   • Prepare investment material according to the manufacturer's instructions
   • Invest wax patterns
4. Burnout, cast and finish alloy fixed partial dentures and structures
   • Select burnout techniques appropriate to the investment material and alloy
   • Cast metal restorations in appropriate alloy
   • Devest metal restoration without damaging casting
   • Check the casting for defects
   • Trim and polish metal restoration while maintaining all contact areas and margins
   • Evaluate the finished restoration
   • Decontaminate the casting according to infection control guidelines
   • Dry the casting, replace on model and place in a sealed container for dispatch

Required Skills

This describes the essential skills and knowledge and their level required for this unit

Essential knowledge The candidate must be able to demonstrate essential knowledge required to effectively do the task outlined in elements and performance criteria of this unit manage the task and manage contingencies in the context of the identified work role This includes knowledge of Applied oral anatomy including articulation and occlusion dentition arrangement of the teeth naming and coding of teeth structures of the oral cavity hard and soft palate lateral and posterior borders of the oral cavity tongue and floor of the mouth teeth form and function Casting and pickling Factors responsible for casting defects Finishing and polishing Fundamental knowledge of model and die materials including epoxy die materials gypsum materials including their chemical and physical properties chemical reaction and the effects of excess water accelerators and retarders waterpowder ratio temperature and humidity hardening solutions manipulation of gypsum materials including the measurement and combination of powder and water spatulation and pouring of the model Fundamental knowledge of dental casting alloys and solders casting alloys including the properties of alloys common casting alloys and the biocompatibility of alloys ceramic bonding alloys solders wrought alloys Fundamental knowledge of waxes including pattern waxes including inlay wax casting wax baseplate wax processing waxes including boxing and utility waxes sticky wax bite registration wax properties of waxes including melting range flow thermal expansion residual stress wax and plastic pattern techniques Infection control guidelines for the decontamination of completed laboratory work Investing and burnout including fundamental knowledge of investment materials investing and expansion of the investment burnout Occupational health and safety policies and procedures Soldering techniques Waxing and spruing techniques

Essential skills It is critical that the candidate demonstrate the ability to Consistently design and manufacture a range of metallic restorations in accordance with prescription Consistently trim polish finish and evaluate metallic restorations that are suitable for insertion in the mouth Consistently comply with current infection control guidelines Australian Standards and legislative requirements as they relate to the dental technicians specific job role Consistently comply with occupational health and safety policies and procedures as they relate to the dental technicians specific job role In addition the candidate must be able to effectively do the task outlined in elements and performance criteria of this unit manage the task and manage contingencies in the context of the identified work role This includes the ability to Consistently follow occupational health and safety policies and procedures Consistently follow sequenced written instructions and manufacturer specifications for the preparation of materials Critically evaluate all work produced so as to consistently meet both the technical requirements of the laboratory and client requirements Select materials and techniques to manufacture cast metal alloy removable partial denture framework Use appropriate practices to ensure efficient use of power and other resources Use safe work practices to minimise the risk of transmission of infection including consistently following the procedure for washing and drying hands consistently putting into practice clean techniques consistently using personal protective equipment consistently limiting contamination consistently maintaining clean receiving and work areas Use literacy skills to read and follow directions policies and procedures including occupational health and safety policies and procedures infection control policies and procedures material safety data sheets laboratory policies and procedures

Evidence Required

The evidence guide provides advice on assessment and must be read in conjunction with the Performance Criteria Required Skills and Knowledge the Range Statement and the Assessment Guidelines for this Training Package
Critical aspects for assessment and evidence required to demonstrate this competency unit	The individual being assessed must provide evidence of specified essential knowledge as well as skills Consistency of performance should be demonstrated over the required range of workplace situations
Context of and specific resources for assessment	Assessment should replicate workplace conditions as far as possible Where for reasons of safety access to equipment and resources and space assessment takes place away from the workplace simulations should be used to represent workplace conditions as closely as possible
Method of assessment	Evidence of essential knowledge and understanding may be provided by traditional or online computerbased assessment written assignmentsprojects Case study and scenario as a basis for discussion of issues and strategies to contribute to best practice Questioning Staff andor client feedback Supporting statement of supervisor Authenticated evidence of relevant work experience andor formalinformal learning Role playsimulation
Access and equity considerations	All workers in the health industry should be aware of access and equity issues in relation to their own area of work All workers should develop their ability to work in a culturally diverse environment In recognition of particular health issues facing Aboriginal and Torres Strait Islander communities workers should be aware of cultural historical and current issues impacting on health of Aboriginal and Torres Strait Islander people Assessors and trainers must take into account relevant access and equity issues in particular relating to factors impacting on health of Aboriginal andor Torres Strait Islander clients and communities

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Range Statement

The Range Statement relates to the unit of competency as a whole. It allows for different work environments and situations that may affect performance.
Metallic restorations may include:	Crown and bridge structures Crowns Inlays Onlays Single posts and cores
Construction of crown and bridge structures includes:	A range of designs Anterior and posterior teeth Ceramic fused to metal sub structures Metal inlays, crowns and bridges
Casting defects may include but are not limited to:	Incomplete casting Porosities Rough surfaces

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