Impression material
What is the purpose of an impression?
To reproduce the form of the teeth
The "Cusp of Carabelli" is found on the
Lingual on the maxillary first molar
Operating zone
operator is positioned to access oral cavity & have best visibility. right handed 7 to 12 o'clock. left handed 12 to 5 o'clock.
Goal of soft tissue management
preservation of periodontal tissue while controlling the field of operation
Perio Probe
Measures depth of sulcus / gum pocket
What are the three basic types of Impressions?
1. Preliminary
2. Final
3. Bite registration (occlusal)
When looking at a tooth from the facial (buccal), aspect, the tooth has three buccal cusps, with the smallest of the three cusps on the right. This tooth is a __________ first molar
Mandibular left first molar
assisting zone
where assistant sits to easily assist dentist and have access to instruments, evacuator, dental until and cart. right handed 2 to 4 o'clock. left handed 8 to 10 o'clock.
Examples of soft tissue management
rubber dam, cotton roll, mouth mirror, supraG margins, gingival retraction
Amalgam Carver Cleoid/Discoid
carves occlusal of amalgam
What is another name for diagnostic cast?
replica or study model
The three parts of the crown portion of an anterior tooth are
Cervical
Middle
Incisal
static zone
rear delivery systems are found in static zone as well as dental instruments and equipment used at chair. right handed 12 to 2 o'clock. left handed 10 to 12 o'clock.
What gets in the way
gingival tissue, gingival fluids, and hydrophobic impression materials
To carry and dispense amalgam.
Amalgam carrier
What are the key properties (3) of impression materials?
1. Accuracy: Must closely adapt to the tooth's surface, preparation, and tissues to record deal.
2. Tear Resistance: Must not tear during removal.
3. Dimensional Stability: Remains dimensionally stable after removal.
Overbite is the
Vertical overlap of maxillary anteriors over mandibular anteriors
transfer zone
area below patients nose where instruments & materials are passed & received. right handed 4 to 7 o'clock. left handed 5 to 8 o'clock.
Criteria for ideal retraction materials
gingival displacement and sulcular fluid control, no irreversible damage to the ginigva, minimal adverse systemic effects
To carve anatomy interproximal surface of amalgam restorations
Hollenback
How will mixing with cold water affect the setting time of alginate?
increase working and setting time
The technician should wear ________ when using a separating disc to cut away any material
Safety glasses
assistant positioning.
-seated well back on the chair/stool.
-feet resting on the base or foot ring of the stool.
-positioned as close as possible to the dental chair.
-hip towards patient with legs parallel to the patient's chair.
-eye level 4 to 6 inches above the eye level of the operator.
Why retract
obtain accurate impression of subG areas of prep, isolate cervical area of prep
To pack and condense amalgam into cavity preparation
Condenser