Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
43 Cards in this Set
- Front
- Back
|
primary cause of sealant retention |
Moisture contamination due to operator error
*** inadequate etching is another cause |
|
|
Primary teeth and teeth with fluorosis need _______ etching time. |
Longer (45-1 min) |
|
|
Creates tiny depressions, which increase tooth surface area for mechanical locking. |
Etching |
|
|
Pulling force applied in opposite directions to stretch and object. |
Tensile |
|
|
Force applied to crush or push on an object. |
Compressive |
|
|
Twisting force applied when two surfaces slide against each other |
Shear |
|
|
When the internal force on the tooth resist the applied force= |
Stress Amount of force excerted from within an object |
|
|
If stress cannot resist the force, distortion and deformation occurs and the object is considered= |
Strained amount of change that the force has produced. |
|
|
Used to make replicas of teeth and other oral tissues. |
Impression materials
|
|
|
Most widely used impression material in dentistry |
Irreversible Hydrocollid: Alginate |
|
|
Setting time of alginate impressions may be best adjusted by |
Altering water temperature cooler= slower Warmer= faster |
|
|
Mainly used in FINAL impression materials (Crown, bridge) Undergoes a PHYSICAL reaction only |
Reversible Hydocolloid |
|
|
Too much water |
Imbibition |
|
|
Too little water- |
Syneresis |
|
|
Issues regulations to protect workers from disease transmission and promoting hazard control. |
OSHA |
|
|
SDS for our clinic are kept in a notebook in cabinet where? |
Below autoclave #2 in sterilization room |
|
|
Least filler- fluffy generally white in color ADA: Type 11 Gypsum |
Plaster |
|
|
Generally yellow in color ADA: Type 111 Gypsum |
Stone |
|
|
Most filler- hard ADA: Type IV Gypsum |
Improved stone |
|
|
Highest expansion of any gypsum product. Least compressive stregth. Used for study models- Needs the most water |
Plaster |
|
|
If the heating process is done under steam pressure at a higher temp, a smaller more uniformly shaped, and less porous form is produced. An alpha- hemihydrate |
Stone |
|
|
Higher compressive strength than the others. Lower setting expansion than plaster. Used for study models for trays and for complete partial denture construction |
Stone |
|
|
Alpha- hemihydrate but a modified type. Most dense, has the HIGHEST compressive strength; LOWEST expansive strength. Contains additives that make it durable. Used for crowns and bridges |
Improved stone |
|
|
Ratios: Plaster: Stone: Improved stone: |
1:2 1:3 1:4
|
|
|
After mixing for___ _____, the working time begins. |
1 minute |
|
|
The anatomical portion |
Replicates the hard and soft structures 2/3 |
|
|
are caused by trapped air in the alginate impression. |
Bubbles |
|
|
Caused by trapped air in the dental stone as it is mixed, vibrated, poured. |
Voids |
|
|
Retardant to slow down the set of stone. |
Adding Borax Blood and saliva left on impression will also slow the setting of stone |
|
|
Direct contact of fluoride with exposed tooth surface. |
Topical |
|
|
Entry of fluoride into the blood supply of developing teeth. |
Systemic |
|
|
After tooth eruption, which type of fluoride is more benificial? |
Topical |
|
|
Margin extends 2mm beyond gingva |
Mouthguard or nightguard tray |
|
|
Scalloped margin extends to the CEJ |
Bleaching trays |
|
|
Commonly between 16-22 % carbamide peroxide |
Professional whitening products |
|
|
Usually 3-7% hydrogen peroxide |
OTC bleaching products |
|
|
best advice for tooth sensitiviy |
use potassium nitrate for 2 weeks prior to and during bleaching. (30 mins 2* a day) |
|
|
Increase in intrapulpal tempt. during heat-light, or laser-activated bleaching may result in |
Reversible pulpitis |
|
|
Thin layer used to provide barrier against irritating portion of most restorative materials |
Liners |
|
|
Irritates pulp to best stimulate secondary/reparative dentin formation |
Calcium hydroxide (Dycal) |
|
|
Soothes pulp. Contains cloves. Zinc- Oxide= gives strength and durability. Eugenol= Has a sedative effect (pH=7) ** Unlike Dycal it does NOT stimulate secondary dentin formation. Weakest type of cement |
Unreinforced ZOE |
|
|
Thick layer of material that acts: Thermal insulation Mechanical protection of pulp Supports metallic restorations |
Bases
|
|
|
Contains integrated resin fibers to increase compressive strength lacking in unreinforced ZOE. Can last up to 1 yr, used as a base or temp restoration, also surgical dressing. |
Reinforced ZOE IRM |
