Periodontal Instrumentation Flashcards

Flashcards covering key vocabulary related to periodontal instrumentation, modified pen grasp, instrument design, terminology, and ergonomic principles from the lecture notes.

Modified Pen Grasp

The recommended, precise grasp for holding a periodontal dental instrument, including more fingers for better stability, designed to facilitate precise instrument control, allow detection and removal of deposits, and lessen the risk of musculoskeletal stress and injuries. It is different from the pen grasp used for writing.

Pen Grasp

A manner of holding an instrument similar to how one holds a pencil for writing, but it is not precise enough for periodontal instrumentation and provides less stability than the modified pen grasp.

Handle

One of the three basic parts of a dental instrument, characterized by its size (thin, medium, fat diameter), shape (round, octagon, hour-glass), and surface texture (ribbed, scored, waffle). It can be single or double-ended.

Shank

One of the three basic parts of a dental instrument, thinner than the handle, which joins the working end and the handle. It can be rigid or flexible, simple to complex, and its length and angle vary depending on the area to be instrumented.

Working End

The portion of a dental instrument used on the tooth surface, also referred to as the blade or cutting edge. Its design indicates the instrument's use and determines its classification, such as the head of a mirror, tip of an explorer, or blade of a curet.

Terminal or Lower Shank

The section of the instrument shank that extends from the blade to the first bend in the shank.

Curet

A type of dental instrument working end that has a rounded toe and a semi-circular cross-section, with cutting edges formed where the face meets the lateral surface.

Scaler

A type of dental instrument working end that terminates in a pointed tip, with a cross-section showing its face and two cutting edges formed where the lateral surfaces meet the face at 70°-80° angles.

Internal Angles (Curet/Scaler)

The 70°-80° angles at the cutting edges of a curet or scaler, which are restored by sharpening techniques.

Universal Curet

A curet design where the blade is at a 90° angle to the lower shank.

Gracey Blade

An area-specific curet blade where the face is offset at a 70° angle to the lower shank.

Instrument Classification

One of the four criteria for instrument identification, categorizing instruments as either detection instruments (e.g., explorer, probe) or treatment instruments (e.g., curets, sickles, files).

Instrument Design

One of the four criteria for instrument identification, referring to the name of the individual or school responsible for the instrument's development, such as 'Gracey' or 'Marquis'.

Design Number

One of the four criteria for instrument identification, providing specific identification of a design, such as 1/2, 11/12, or 13/14, often indicating specific working ends or areas of use.

Manufacturer Name

One of the four criteria for instrument identification, where different companies may produce the same instrument design with variations in handle style, metal type, or blade angulation (e.g., HuFriedy).

Palm Grasp

A type of grasp not used for scaling or root planing, but useful for stabilizing instruments during sharpening, holding patterns, or manipulating an air/water syringe. It offers little tactile sensation or maneuverability.

Thumb and Index Finger (Modified Pen Grasp)

These fingers holds the instrument handle, contacting it opposite each other with space between, in a bent or rounded 'Soft C-Shape' (Cheerio). They should hold the handle lightly, avoiding a 'death grip'.

Middle Finger (Modified Pen Grasp)

One side of the finger pad rests lightly on the instrument shank, and the other side rests against (or slightly overlaps) the ring finger. Its functions are to guide the working-end and feel vibrations transmitted from the working-end to the shank.

Ring Finger (Modified Pen Grasp)

This finger serves as the fulcrum, resting on a tooth. It stabilizes and supports the hand for control and strength, is held upright and rigid, and advances ahead of the other fingers in the grasp.

Fulcrum

A finger rest used to stabilize the clinician’s hand during periodontal instrumentation, acting as a pivot point for instrument movement and providing control and strength. It is synonymous with 'finger rest'.

Blanched Fingers

An indication that the instrument is being held too tightly in the modified pen grasp, potentially leading to musculoskeletal stress.

Overlapped Fingers

An incorrect finger position in the modified pen grasp where the thumb and index finger touch or overlap, making it difficult to roll the instrument and adapt the toe/tip to the tooth, and potentially causing injuries.

Stacked Fulcrum

A technique where the index, middle, and ring fingers are stacked and in contact at at least one point, providing stability, strength, optimum blade angulation, and allowing wrist-forearm motion while reducing tissue trauma.

Intra-oral Fulcrum

A finger rest established inside the mouth, typically with the pad of the ring finger placed on the occlusal surface of a tooth adjacent to the working area, providing the best stability and leverage.

Extra-oral Fulcrum

A finger rest established outside the mouth, where the dominant hand rests against the patient’s cheek or chin, requiring a firm base of support.

Split Fulcrum

An incorrect fulcrum characterized by no point of contact between the middle and ring fingers in the grasp, leading to a weak grasp, stressed muscles, loss of instrument control, and potential tissue trauma or loss of power.

Wrist-Forearm Motion

A fundamental skill for instrumentation where force is applied by moving the wrist and forearm as a unit while pivoting on the fulcrum finger, with the wrist and elbow in a neutral position, to prevent cumulative trauma.

Neutral Wrist Position

A wrist position where the wrist is in a straight line with the forearm, preventing cramping of the median nerve in the carpal tunnel and reducing the risk of conditions like carpal tunnel syndrome.

Carpal Tunnel Syndrome

A musculoskeletal disorder that can result from repeated pressure on the median nerve in the wrist, often caused by incorrect wrist positioning or excessive force during instrumentation.