Da311 test review

Acrylic resin

A common material used to make a custom provisional (polymethyl methacrylate or bis-acrylic composite).

Indirect method

The preferred method of making a provisional, fabricated outside the mouth to reduce chair time and tissue irritation.

Cement types for provisional crowns

Zinc oxide eugenol (ZOE), polycarboxylate cement, or resin-based temporary cements.

At-home instructions for provisional coverage

Avoid sticky or hard foods; brush and floss gently; contact the office if the provisional comes off; avoid excessive chewing on the treated side.

Polycarbonate crown

Used for anterior teeth when a stronger and more aesthetic temporary restoration is needed.

Vacuum-formed resin material

Used for making a bleaching tray or for provisional coverage.

Air bubbles in a model

Caused by improper mixing of plaster or stone, pouring too quickly, or incomplete spatulation.

Infection control in the dental lab

Includes no eating or drinking, following manufacturer’s instructions, reporting accidents, and cleaning the work area.

Perforated tray

Required for taking an impression using a reversible hydrocolloid material.

Preliminary impression

Taken to make diagnostic models, custom trays, provisional restorations, or orthodontic appliances.

Hot water effect on alginate setting time

Hot water speeds up the setting time.

Automix system for elastomeric materials

Uses a cartridge with a base and catalyst in an extruder gun.

Disinfecting an impression

Rinse with water, spray with EPA-approved disinfectant, let sit for the recommended time, then rinse and store.

Mixing plaster process

Add powder to water, mix for 1 minute, and use a vibrator to remove air bubbles.

Dental lathe

Used to trim and polish custom trays, dentures, and other dental prosthetics.

Dental vibrator

Removes air bubbles from plaster or stone and helps material flow evenly into the model.

Articulator

Holds the mandibular and maxillary models in a position to simulate the patient’s bite.

Bite registration

An impression that shows the occlusal relationship of the upper and lower teeth.

Bite registration wax

Commonly used material for taking a bite registration.

Horseshoe-shaped wax with aluminum foil

Used for a bite registration.

Baseplate wax usage

Records occlusal rims for the initial denture form.

First step for making a custom tray

Take a preliminary impression.

Instructions for bite registration

Close gently into their natural bite, stay still while the material sets, breathe normally through the nose.

Types of provisional coverage

Custom provisional coverage – used for crowns and bridges; Prefabricated provisional – used for single-unit teeth, such as shell-like crowns.

Art portion of a study model

The base.

Imbibition

Absorption of water, causing an object to swell.

Time frame for pouring alginate impressions

Within an hour of taking the impression.

Time to wait before removing a model from an impression

Around 45 minutes.

Removing an alginate impression

Use a quick snap-out motion to avoid distortion.

Common irreversible hydrocolloid in dentistry

Alginate.

Help for bad gag reflex during an impression

Use fast-set material, tell the patient to breathe through their nose, and sit them upright.

Adjusting setting time of alginate

Use colder water to slow setting time, warmer water to speed it up.

High viscosity elastomeric impression material

Putty impression material.

Impression material for final impressions

Stone.

Syneresis

The loss of water, which causes shrinkage.

Types of impression trays

Quadrant tray (one side of the mouth), section tray (anterior teeth), full arch tray (entire upper or lower arch).

Gypsum material for creating dies

Type IV dental stone (die stone).

Seating an upper impression tray

First seat tray in the posterior (back) teeth.

Impressions vs models

Impression is the negative reproduction, and model is the positive reproduction.

Elastomeric impression mixing order

Light body material mixed first, followed by heavy body while the light body is applied.

Pouring an impression

Add small increments of stone or plaster at a time.