Knowing your instruments cold is one of the most fundamental competencies in dental assisting. When the dentist reaches out a hand, you should already know what comes next. This guide categorizes and describes every major instrument group you'll encounter in general dentistry — what each instrument is, how to identify it, and what it's used for.
How to use this guide: Read through it once for a complete overview. Then use it as a reference when setting up trays — checking instrument names, identifying unfamiliar tools, and building your instrument vocabulary. The faster you can identify and pass instruments, the more valuable you are at the chair.
Examination instruments
| Instrument | Description | Use |
|---|
| Mouth mirror | Round mirror on a handle; numbered by size (most common: #4 and #5) | Indirect vision, light reflection, tissue retraction |
| Explorer (shepherd's hook) | Sharp pointed tip with a curved end | Detecting decay, calculus, margins; exploring pits and fissures |
| Periodontal probe | Thin, blunt-tipped with millimeter markings | Measuring pocket depths around teeth |
| Cotton pliers (college pliers) | Locking or non-locking tweezer-style; angled tips | Placing and removing cotton rolls, small items; transferring materials |
Hand cutting instruments
| Instrument | Description | Use |
|---|
| Spoon excavator | Spoon-shaped blade; sharp edges | Removing soft decay from cavity preparation |
| Hatchet | Straight blade perpendicular to handle | Planing enamel walls in cavity preparation |
| Chisel | Straight or curved blade; beveled edge | Breaking down unsupported enamel, smoothing cavity walls |
| Gingival margin trimmer | Curved blade with angled cutting edge | Beveling gingival margins of cavity preparations |
Restorative instruments
| Instrument | Description | Use |
|---|
| Plastic filling instrument (PFI) | Double-ended; flat and condenser ends | Placing and adapting composite and other tooth-colored materials |
| Composite placement instrument | Various tip shapes — ball, flat, angled | Placing, shaping, and adapting composite resin |
| Amalgam carrier | Cylinder with plunger mechanism | Carrying and dispensing amalgam into cavity preparations |
| Amalgam condenser | Cylindrical or round working end | Packing amalgam into cavity preparation |
| Burnisher (ball, beaver tail, acorn) | Smooth, rounded working ends in various shapes | Smoothing and adapting amalgam margins; contouring restorations |
| Carver (hollenback, discoid-cleoid) | Blade with sharp edges | Carving occlusal anatomy into freshly placed amalgam |
| Matrix retainer (Tofflemire) | Frame with adjustable band holder | Holds matrix band around tooth during posterior restoration placement |
| Woodson instrument | Double-ended; flat and plugger ends | Placing and packing base materials and cement liners |
Crown and bridge instruments
| Instrument | Description | Use |
|---|
| Crown remover (CORONAflex / Coronaflex) | Impact device or lever system | Removing temporary or permanent crowns |
| Spatula (cement spatula) | Flat, flexible blade | Mixing cements, liners, and bases on a glass slab or paper pad |
| Seating instrument | Flat-ended condenser or stick | Seating crowns and inlays; directing patients to bite down evenly |
| Interproximal finishing strips | Abrasive strips in various grits | Finishing and polishing interproximal surfaces of restorations |
| Instrument | Description | Use |
|---|
| Elevator (straight, crane pick, apical) | Various blade shapes; lever principle | Luxating teeth — expanding socket, severing periodontal ligament |
| Extraction forceps | Hinged; beaks shaped for specific tooth groups | Gripping and removing teeth; upper and lower sets differ in beak angle |
| Surgical curette | Spoon-shaped with sharp edges | Removing granulation tissue from extraction sockets |
| Rongeur forceps | Hinged with sharp cutting edges | Trimming sharp alveolar bone edges after extraction |
| Bone file | File surface with handle | Smoothing rough bone after extraction or alveoloplasty |
Periodontal instruments
| Instrument | Description | Use |
|---|
| Sickle scaler | Triangular cross-section; two cutting edges; pointed tip | Removing calculus above and at the gumline |
| Curette (universal) | Rounded toe; two cutting edges; curved blade | Scaling and root planing above and below the gumline |
| Curette (Gracey) | Area-specific; one cutting edge; offset blade | Subgingival scaling for specific tooth surfaces |
| Ultrasonic scaler tip | Vibrating metal tip; water irrigation built in | Removing calculus and biofilm through ultrasonic vibration |
Handpieces and burs
Handpieces
- High-speed handpiece (air turbine) — up to 400,000 RPM; used for cutting tooth structure, removing decay, crown preparations. Always used with water spray coolant.
- Low-speed handpiece — variable speeds up to 40,000 RPM; used with straight or contra-angle attachment for polishing, finishing, and slow-speed drilling
- Electric handpiece — motor-driven rather than air-turbine; consistent torque at all speeds; increasing preference in many practices
Common bur types
- Round bur — sphere-shaped; used for initial entry into tooth, caries removal
- Fissure bur (straight and tapered) — cylindrical; used for cavity preparation walls and crown preparations
- Inverted cone bur — wider at tip; used for creating undercuts in cavity preparations
- Diamond bur — diamond particles on surface; used for gross tooth reduction, crown preparations
- Finishing bur — fine fluted; used for smoothing and finishing composite and tooth surfaces
The bottom line
Instrument knowledge is built through repetition — handling instruments daily, setting up trays, and connecting every tool to its purpose. Study this reference, then verify your knowledge at the chair: pick up instruments before you set them on the tray and name them out loud. That active practice builds identification speed faster than reading alone.