Plaster model of lower partial metal denture frames before the teeth are placed; the upper half of the plaster, including the teeth, is light green, and the bottom half is cream; there are words handwritten in black marker on the bottom.
Plaster model of lower partial metal denture frames before the teeth are placed; the upper half of the plaster, including the teeth, is light green, and the bottom half is cream; there are words handwritten in black marker on the bottom.
Number Of Parts
1
Provenance
Belonged to donor.
Dates
1960
2015
circa 1960-2015
Date Remarks
Based on other denture models of the same lot
Material
plaster: green, cream
metal: grey
ink: black
Inscriptions
Handwritten on bottom: "Lower // Partial denture // Frames // before teeth // placed".
Permanent Location
Storage Room 0010
0010-B2-9 Row A
Length
7.5 cm
Width
6.4 cm
Height
3.8 cm
Unit Of Measure
centimeters
Copy Type
original
Reference Types
Website, Denturist
Reference Comments
Danielle Arsenault, DD (Denturist)
Colgate Oral Care Centre, "What Are Dentures Made Of?", by Tracey Sandilands, last updated 2019: https://www.colgate.com/en-us/oral-health/cosmetic-dentistry/dentures/what-are-dentures-made-of-0415
Research Facts
This is a Mandibular Partial Cast framework on die stone model (lower jaw)
Clasification #3 Modification #1 (bilateral space between the molar and front teeth, on different sides of the same arch)
Die stone Green (High-strength or improved stone): can withstand up to 5,000 lbs of pressure. This is normally used for partal castings or crown and bridge work for its high strength as well as preserving details within the impression. The base of model in photos 1-6 is made of regular stone (type 3) which can withstand up to 3,000 lbs of pressure. This was used as the base of the model for cost effectiveness.
Molars: because of the classification mentioned previously the molars will be used as anchors for the denture. The anchors in this casting are called akers clasps which are most commonly used because of their design. They are strong, and resistant clips that help hold the denture in place while the patient is chewing or talking.
Front teeth: normally for this design there would be clasps on the teeth that are closest to the space. However, having no clasps increases the patients esthetics but can reduce the resistance while the patient is chewing or talking.
Front teeth, metal plate: the metal plate at the back of the front teeth is known as "lingual apron" this is the major connector which means it connects one side of the arch to the other. There are many types of major connectors however this one is more commonly used. This will protect the back of the remaining teeth as well as prevent the denture from tipping during chewing or talking. This is also used incase the patient looses one of the front teeth for easy addition of another denture tooth.
Metal between the front tooth and molar: this is the area where the denture teeth will be placed. The metal is known as mesh and is used to retain the plastic base (acrylic). This is also used to connect the front part of the denture to the back teeth. Unfortunately metal and acrylic do not bond together properly so the mesh (holes) will aid in the strengh of the bond.
Cast framework: The majority of castings are made from chromem-colbalt unless specifided by dentist or denturist. Other metals such as; gold, platinum, pallidum, nickel, titanium, ticonium can be used based on the patients needs.
A framework is needed to support dentures, and can be made of resin or metal (often chrome cobalt). Metal plates are less likely to break, and are good for partial plates to be hidden behind remaining teeth, as in this model.