Hand Instrument Flashcards
Classification based on their usage?
- Exploratory instrument
- Cutting instrument
- Non- cutting restorative instrument
Exploratory instrument?
- Mouth mirror
- Explorer
- Probes
- Tweezers
Uses of mouth mirror?
- Indirect vision
- Retraction of the cheek
- Transillumination
- Tissue protection : guards the tongue and cheeks against accidental injury from rotary operating instrument like the bur.
Types of mirror
- i. Front surface mirror : the coating is present on the front surface of the mirror. (Prevent distortion)
ii. Back surface mirror : the coating is present on the back side of the mirror. - i. Plane mirror
ii. Concave surface - i. One sided mirror
ii. Twin sided mirror
Parts of explorer?
- Handle
- Shank
- Explorer tip
Types of explorer?
- Straight explorer
- Arch explorer ( Shepherd’s hook) :semicircle with exploring tip at a right angle to the handle
- Cow horn or pigtail explorer : smaller semicircle than arch explorer
- Interproximal explorer : it has two or more angles
Interproximal explorer tip is used for?
- Detecting proximal carious lesion
- Assessing marginal fit of restoration
- Removing excess restorative material
Use of probes?
- to determine the dimension and features of preparation and restoration
Types of probes ?
- Williams probe
- PCP Probe (marquis marking )
- PSR Probe ( periodontal screening and recording probe)
Dental tweezer is also known as?
Dressing plier
Uses of tweezer?
- Grasping or transferring material in and out of the oral cavity
- Placing and removing cotton rolls for isolation of the cavity
- Placing cotton pellets for drying the cavity
Cutting instrument?
- Excavator
- Chisel
- Enamel hatchet
- Gingival marginal trimmer
- Enamel hoe
Use of spoon excavator?
- Used for removing carious dentin
2. for carving amalgam or direct wax pattern
Types of spoon excavator?
- Discoid spoon excavator
2. Cleoid spoon excavator
Types of chisel?
- Straight chisel
- Monangle chisel
- Bin angle chisel
- Triple angle chisel
- Wedelstaedt chisel
Straight chisel?
- Has a straight shank and blade with the bevel on only one side
- Primary cutting edge of a chisel is perpendicular to the axis of the handle
- Used with straight thrust force, push motion
- Primary used for cutting enamel.
Enamel hatchet?
- single planed paired instrument ( right and left types)
- it can be binangle, triple angled or parallel with the shaft
- single planed and are used with push/pull vertical movement
Uses of enamel hatchet?
Used to cut or cleave undermined enamel in proximal cavities and on buccal or lingual walls.
Gingival margin trimmer?
- this is a paired double planed instrument
- Gingival margin trimmer is similar in design to enamel hatchet, except that the blade is curved, and the bevel for the cutting edge at the end of the blade is always on the outside of the curve with the face of the instrument being on the inside of the curve.
Types of gingival margin trimmer?
- Mesial gingival margin trimmer
2. Distal gingival margin trimmer
Gingival margin trimmer are designed to produced ?
- proper bevel on gingival enamel margins of proximoocclusal preparation
- roundening or bevelling of the axiopulpal line angle
How gingival margin trimmer is used?
In a lateral scrapping motion
Used of enamel hoe?
- smoothening of enamel wall
- class III gold restoration
