p.12
Surveying Techniques and Tools
What is a dental surveyor?
An instrument used to determine the relative parallelism of two or more surfaces of teeth or other parts of the dental arch cast.
p.6
Procedure for Fabricating Baseplate
What is the first step in the Lost Wax Technique?
Production of a wax model of the final product.
p.13
Surveying Techniques and Tools
What is one of the uses of a surveyor in dentistry?
To determine the favourable and unfavourable undercut area.
p.15
Requirements for Baseplate
Is an undercut desirable for amalgam restorations?
Yes, it is a desirable feature for amalgam restorations.
p.13
Surveying Techniques and Tools
What does a surveyor help to locate on a surveyed model?
The accurate device, e.g., precision attachment.
p.10
Procedure for Fabricating Baseplate
What is the first step in making a wax rim?
Soften the wax block by warm water.
p.14
Surveying Techniques and Tools
What is the function of the Undercut Gauge?
For measuring undercut on the cast.
p.10
Requirements for Baseplate
What is a requirement for a partial baseplate?
It must be stable, and clasps should be added.
p.16
Requirements for Baseplate
What is the purpose of tilting models in dental applications?
To create desirable undercut for clasps, equalize the undercut area, and place the retentive part of the appliance in a better position for esthetics.
p.16
Requirements for Baseplate
What are the different directions in which models can be tilted?
Anterior tilt, anterior depressed, and posterior upward.
p.13
Requirements for Baseplate
What is a path of insertion in dentistry?
It is the path along which a prosthesis is inserted or removed in the mouth.
p.9
Occlusal Rim Definition and Purpose
What should the shape of the occlusal rim follow in a lower edentulous case?
The shape of the alveolar ridge.
p.19
Duplication Techniques and Materials
What is one reason for making duplicate models?
For practical and examination purposes.
p.9
Occlusal Rim Definition and Purpose
What angle does the end of the lower rim typically slope down to from the occlusal surface?
Approximately 45 degrees.
p.19
Duplication Techniques and Materials
What is the composition of agar?
85% water and 13% agar (derived from seaweed).
p.8
Requirements and Properties of Rim Materials
What is the typical slope of the end of the upper rim towards the tuberosity?
Approximately 45 degrees from the occlusal surface.
p.8
Requirements and Properties of Rim Materials
What is the contour requirement for all surfaces of the rim?
All surfaces and contour should be smooth.
p.3
Procedure for Fabricating Baseplate
What is the procedure for preparing a self-cured PMMA baseplate?
Outline periphery down to sulcus, block undercut, and apply Vaseline.
p.2
Procedure for Fabricating Baseplate
What should be done to the baseplate area during the fabrication process?
Outline the baseplate area.
p.1
Requirements for Baseplate
Why must a baseplate have sufficient space on top?
For placing wax rim material and artificial teeth.
p.7
Information Recorded from Occlusal Rim
What does the canine line show in denture design?
The width of the anteriors.
p.11
Occlusal Rim Definition and Purpose
What should the height of the partial rim be in relation to neighboring teeth?
It should be on the same level.
p.17
Requirements for Baseplate
What is the effect of posterior tilt on the undercut area?
Increases the lingual, palatal, and distal undercut area.
p.17
Requirements for Baseplate
What is the purpose of blocking the undercut area?
To facilitate the insertion and removal of the dental appliance.
p.13
Requirements for Baseplate
What type of denture is usually fabricated to have a single path of insertion?
A removable partial denture.
p.10
Occlusal Rim Definition and Purpose
What are the three forms of dental arches mentioned?
Square Arch, Tapering Arch, Ovoid Arch.
p.14
Surveying Techniques and Tools
What is the purpose of the Analysing Rod?
To analyze the cast to establish the path of insertion.
What materials are used for reinforcing the baseplate?
S.S. wire and tray material.
p.3
Requirements for Baseplate
What is the maximum extension of the baseplate?
It should not exceed the first molar.
p.1
Requirements for Baseplate
What are the requirements for a baseplate?
Cover all denture bearing area, reproduce all details of the cast, and be rigid and dimensionally stable.
p.3
Procedure for Fabricating Baseplate
How should the cold-cured PMMA be adapted onto the surface of the wax layer?
Mould it to a thin sheet and then adapt it onto the surface.
p.7
Occlusal Rim Definition and Purpose
What is an occlusal rim?
An occluding surface built on temporary or permanent denture bases for making upper/lower jaw relation records and arranging teeth.
p.7
Information Recorded from Occlusal Rim
What is meant by lip and cheek support in denture design?
The labial and buccal surface of the denture teeth.
p.2
Procedure for Fabricating Baseplate
What should be done with the reinforcing material during wax baseplate fabrication?
Adapt it onto the sheet wax without interfering with future teeth setting.
p.5
Procedure for Fabricating Baseplate
What is the curing cycle temperature and duration for PMMA?
70℃ for 6 hours, then 95℃ for 1 hour.
p.18
Surveying Techniques and Tools
What can result from not managing blocked undercuts?
Poor fitting of dental appliances and potential discomfort for the patient.
p.6
Procedure for Fabricating Baseplate
What happens to the wax when heated in the Lost Wax Technique?
The wax melts and runs out.
p.15
Requirements for Baseplate
What is an undercut in dentistry?
An area of a tooth cavity that provides resistance to withdrawal or removal of a restoration.
p.13
Surveying Techniques and Tools
What role does a surveyor play in blocking undercut areas?
It assists in blocking the undercut area.
p.13
Surveying Techniques and Tools
What is one of the functions of a surveyor related to drilling?
To assist in drilling parallel holes or cutting parallel planes.
p.14
Surveying Techniques and Tools
What are the three sizes of the Undercut Gauge?
0.25mm (CoCr), 0.5mm (SS), and 0.75mm (Gold wire).
p.1
Baseplate Definition and Function
What is a baseplate?
The foundation on which an occlusal rim is built or artificial teeth are set.
p.3
Requirements for Baseplate
What should be avoided when fixing the wire strengthener?
Avoid affecting the thickness of the rim.
p.2
Procedure for Fabricating Baseplate
How should the outline extension of the baseplate be defined for the upper cast?
Outline down to the sulcus and not beyond the vibrating line and palatine fovea.
p.7
Information Recorded from Occlusal Rim
What does the smile line indicate?
The extent of the teeth and mucosa shown during a smile.
p.4
Procedure for Fabricating Baseplate
What is the purpose of applying cold mould seal in the spray-on cold-cured PMMA process?
To prepare the surface of the cast before spraying.
p.18
Surveying Techniques and Tools
Why is it important to address blocked undercuts in dentistry?
To ensure proper retention and fit of dental prosthetics.
p.19
Duplication Techniques and Materials
What is the primary purpose of duplication in model making?
To preserve the master model.
p.9
Requirements and Properties of Rim Materials
What are the widths of the rim in the anterior, premolar, and molar regions?
_____ , _____7mm and _____ respectively.
p.8
Requirements and Properties of Rim Materials
What is the orientation of the plane of the rim in relation to the ridge?
The plane is parallel to the ridge.
p.15
Requirements for Baseplate
Is an undercut desirable for cast restorations?
No, it is undesirable for cast restorations.
p.15
Requirements for Baseplate
What does the contour of a cross-section of an alveolar ridge prevent?
It prevents the vertical placement of a denture or appliance.
p.8
Requirements and Properties of Rim Materials
What is the positioning of the posterior region of the rim?
A bit out of the ridge buccally.
p.2
Procedure for Fabricating Baseplate
What is the first step in the general procedure for fabricating a baseplate?
Preparation of the model.
p.3
Baseplate Definition and Function
What is the placement of wires for the upper baseplate?
Two wires: one below the ridge about 5mm on the palatal area and another wire across the palate 5mm before the posterior border.
p.3
Baseplate Definition and Function
Where should the wire be placed for the lower baseplate?
Below the lingual ridge about 5mm, avoiding the lingual frenum.
p.7
Information Recorded from Occlusal Rim
What is the center line in denture fabrication?
The midline of the face used to position the teeth.
p.7
Information Recorded from Occlusal Rim
What is the vertical dimension in denture design?
The height required for the dentures.
p.18
Surveying Techniques and Tools
What is a blocked undercut?
A dental term referring to an area that is obstructed and cannot be accessed for proper fitting of dental appliances.
p.17
Requirements for Baseplate
What happens to the undercut area when there is a buccal tilt?
The undercut area near the depressed side increases, while the opposite side decreases.
p.6
Procedure for Fabricating Baseplate
What is the relationship between the acrylic and the wax pattern after polymerization?
The acrylic is the same size as the wax pattern.
p.13
Surveying Techniques and Tools
How does a surveyor assist in the design of a dental appliance?
By finding the best path of insertion/removal.
p.9
Requirements and Properties of Rim Materials
What are the properties of rim materials in a lower edentulous case?
Dimensional stability, firm attachment to the base, easy adjustment, non-toxic, easy to manipulate, and inexpensive.
p.10
Procedure for Fabricating Baseplate
What is used to smooth the contour of the wax rim?
A sharp knife, hot flat metal plate, or sandpaper.
p.15
Surveying Techniques and Tools
What is the rule for surveying models in dentistry?
Models are surveyed with the occlusal plane parallel to the base of the surveyor, placed horizontally.
p.1
Requirements for Baseplate
What should the shape and contour of the baseplate's periphery be?
Identical to the finished denture base and should be smooth.
p.7
Information Recorded from Occlusal Rim
What does the occlusal plane refer to?
The plane at which the teeth meet.
p.4
Procedure for Fabricating Baseplate
What is the first step in mixing moldable cold-cured PMMA?
Mix monomer and polymer with the recommended ratio.
p.2
Procedure for Fabricating Baseplate
How should the sheet wax be adapted onto the cast?
Soften and adapt it, then mould the periphery by folding the softened wax onto the sulcus.
p.5
Procedure for Fabricating Baseplate
What are the five general polymerization stages of Poly-Methyl-methacrylate (PMMA)?
Sandy, Stringy, Dough, Rubbery, Stiff.
p.12
Requirements for Baseplate
What does the term 'relief area' refer to in dentistry?
The reduction or elimination of undesirable pressure or force from a specific region under a denture base.
p.6
Procedure for Fabricating Baseplate
What material is used to embed the wax model in the Lost Wax Technique?
A material that can withstand the temperature of hot water.
p.8
Requirements and Properties of Rim Materials
What is a requirement for the occlusal surface of the rim?
It should be smooth and flat with a sharp edge.
p.10
Occlusal Rim Definition and Purpose
How are the central incisors positioned in a Square Arch?
In line with the canines.
p.10
Occlusal Rim Definition and Purpose
In a Tapering Arch, how are the central incisors positioned relative to the canines?
At a greater distance forward than the canines.
p.8
Requirements and Properties of Rim Materials
How should the shape of the rim correspond to the alveolar ridge in an upper edentulous case?
The shape of the rim should follow the shape of the alveolar ridge.
p.15
Requirements for Baseplate
How does an undercut contribute to prosthetic devices?
It provides resistance to displacement, increasing retention.
What types of materials can be used for baseplates?
Baseplate wax with strengthener, self-cured acrylic, light-cured acrylic, heat-cured acrylic, hard thermoplastic material, and shellac.
p.2
Procedure for Fabricating Baseplate
What is the final step in the general procedure for fabricating a baseplate?
Finishing of the baseplate.
p.7
Information Recorded from Occlusal Rim
What is centric relation?
The jaw relationship required for the dentures.
p.4
Procedure for Fabricating Baseplate
What is the process for hardening cold-cured PMMA?
Put the uncured PMMA into a pressure pot for polymerization at around 50°C for 15 minutes at 2 Bar pressure.
p.12
Surveying Techniques and Tools
What is the purpose of surveying in dentistry?
To find the most suitable path of insertion and removal for dental appliances.
p.5
Procedure for Fabricating Baseplate
What should be done after deflasking PMMA?
Soak in plaster remover and place in ultrasonic cleaner.
p.16
Requirements for Baseplate
What effect does anterior tilt have on the model?
It increases the undercut in the labial/mesial area.
p.14
Surveying Techniques and Tools
What is the first step in the procedure of surveying?
Check the design (clasps).
p.19
Duplication Techniques and Materials
What can be done to the master model during duplication?
Modify it and create a new stone model.
p.14
Surveying Techniques and Tools
What should be checked regarding the rest seat during surveying?
The space of the rest seat.
p.19
Duplication Techniques and Materials
What materials can be used for duplication?
Agar, alginate, and silicone.
p.14
Surveying Techniques and Tools
What should be checked with the opposing model?
If it bites with the minor connector.
p.10
Procedure for Fabricating Baseplate
When is impression compound used?
When more than one jaw relationship/record is required.
p.8
Requirements and Properties of Rim Materials
How does the anterior region of the rim relate to the posterior region?
The anterior region is in a smooth curve with the posterior region.
p.3
Requirements for Baseplate
Where should the reinforcing materials be placed?
Always on the palatal/lingual areas.
p.2
Procedure for Fabricating Baseplate
What is the purpose of blocking unnecessary undercuts?
To ensure proper fit and function of the baseplate.
p.1
Ideal Properties of Baseplate Material
What is a key characteristic of baseplate material regarding adjustments?
It should allow easy chair-side adjustment.
p.7
Occlusal Rim Definition and Purpose
What is the purpose of the occlusal rim?
To record upper/lower jaw relations, arrange teeth, and determine contours needed to restore a patient’s appearance.
p.2
Procedure for Fabricating Baseplate
What is the first step in creating a wax baseplate?
Outline the extension of the baseplate with a pencil.
p.2
Procedure for Fabricating Baseplate
What separating medium can be applied on the surface of the cast?
Water, cold mould seal, microfilm, supersep, or talc powder.
p.4
Procedure for Fabricating Baseplate
What is the method for achieving the required thickness and contour in spray-on cold-cured PMMA?
Spray the cast with liquid monomer, then spray powder polymers repeatedly.
p.1
Ideal Properties of Baseplate Material
What are the ideal properties of baseplate material?
Rigid, dimensionally stable, capable of reproducing detail, and non-toxic.
p.2
Procedure for Fabricating Baseplate
What area should be covered when outlining the lower cast?
Cover the Retromolar Pad.
p.4
Procedure for Fabricating Baseplate
What is the first step in packing cold-cured PMMA?
Prepare the flask as heat-cured PMMA.
