DEN 114 - Module 2 Instrument Design Assessment Instruments
Principles of Instrument Design
Instruments consist of three main parts:
Working end (A): The part of the instrument that performs the function (e.g., cutting, probing).
Shank (B): The portion that connects the working end to the handle.
Handle (C): The part of the instrument that the user grasps.
Instrument Design: Working End Design
Components of the working end:
Tip: Specific part designed for interaction with the target structure.
Blade: In certain instruments, this is used for cutting or scraping.
Instrument Design: Shank Design
Key factors in shank design:
Length: The total length of the shank influences reach and maneuverability.
Angle: The angle of the shank affects the accessibility and visibility of the working area.
Diameter: Affects the strength and rigidity of the shank, impacting the performance of the working end.
Instrument Design: Entire Shank vs. Terminal Shank
The entire shank encompasses the full length from the handle to the working end.
The terminal shank is the specific section from the final bend to the working end, which can affect how instruments are manipulated during use.
Instrument Design: Terminal Shank
Definition:
Working end: The functioning part of the instrument that interacts with surfaces.
Functional shank: The part of the shank that actively contributes to the performance of the instrument.
Terminal shank: Specifically relates to the section of the shank leading to the working part after any bends.
Instrument Design: Handle Design
Considerations for the handle's design:
Diameter: Larger diameters can provide a better grip for heavier usage.
Weight: Affects the ease of maneuvering the instrument.
Texture: Texture aids in grip security and comfort during use.
Balance: The distribution of weight within the handle can affect ease of use and control.
Uses of Assessment Instruments
Instruments are utilized to assess the existing conditions of a patient's oral cavity. Common types:
Mirror: For visualization.
Probe: For detailed assessment of tooth structures.
Explorer(s): For examination of surfaces and identification of issues.
Air: Utilized for drying teeth for better visibility.
Assessment Instruments: The Mirror
The mirror consists of:
Working End (mirror head): Reflects light to enhance visibility of the oral cavity.
Shank: Connects the working end to the handle.
Handle: Grip portion for use by the operator.
Uses of the Mirror
Functions of dental mirrors include:
Illumination: Enhances visibility of oral structures.
Indirect Vision: Allows visualization of areas that are not directly visible.
Retraction: Holds back cheeks or tongue during procedures.
Transillumination: Allows the examination of the tooth by shining light through it.
Defogging the Mirror
Methods to prevent fogging:
Wiping with wet gauze.
Rubbing the mirror on the inside of the patient’s cheek.
Using a defogging product (such as Listerine).
Assessment Instruments: Compressed Air
The air/water syringe in a dental unit uses compressed air to:
Dry teeth for improved visualization of tooth anatomy.
Increase visibility of supramarginal deposits on teeth.
Cause calculus (tartar) to appear chalky-white when dried with air.
Assessment Instruments: Explorers
Features of explorers include:
Come in variable sizes and shapes.
May be single-ended (e.g., TU17) or double-ended (e.g., ODU 11/12).
Can be paired (mirror images) or unpaired.
Explorer Features
Characteristics that define explorers:
Shank: Thin and flexible, may be straight or curved.
Working End: Thin, wire-like and comes to a pointed tip.
Cross-section: Usually circular, allowing easy navigation in crevices.
Uses for Explorer
Explorers are used for:
Exploring Normal Tooth Anatomy: Understanding basic tooth structure.
Detecting Irregular Tooth Anatomy: Identifying abnormalities in structure.
Detecting Calculus: Identifying deposits on teeth.
Detecting Restorations: Evaluating existing dental work.
Your Explorers
Specific explorers include:
#17 TU: For calculus detection on anterior teeth (single-ended).
#11/12 ODU: For calculus detection on posterior teeth (paired ends).
Exploring Technique
Proper technique involves:
Using a modified pen grasp for instrument handling.
Maintaining a light pinch pressure during manipulation.
Utilizing a good fulcrum point for stability.
Applying light pressure during strokes to avoid pushing against the tooth excessively.
The instrument tip should gently move into the sulcus until resistance indicates a feature or obstruction.
The tip should remain in contact with the tooth and follow the intended direction during strokes.
Employing small, overlapping strokes while keeping the tip closely adapted to the tooth's surface.
Assessment Instruments: Probes
Probes serve as measuring instruments with the following characteristics:
Multiple measurement markings for precise readings.
Some are color-coded for improved visibility and readability.
Certain designs include measurement markings that skip numbers for enhancing readability.
Probe Features
Unique aspects of probes:
Tip: Straight, narrow, and blunt for accurate measurements.
Marked in millimeters for reference.
Cross-section can either be circular or flat (notably, the subject probes in use are circular).
Uses for the Probe
Probes are utilized to:
Measure sulcus/pocket depth.
Assess recession/level of attachment.
Size lesions for determining their impact.
Detect bleeding points during examinations for further clinical insights.
Your Probe Ends
Specific probes include:
PCP 11.5b (WHO probe):
Measurement markings at 0.5 mm intervals (0.5, 3.5, 5.5, 8.5, 11.5 mm).
The 'b' designates a ball end for gentle probing.
Used for Periodontal Screening (PSR).
UNC 12 Probe:
Measurement markings each millimeter from 1 to 12.
Employed for detailed periodontal charting.
Probing Technique
Key techniques for effective probing:
Following the contour of the tooth is crucial for accuracy.
Ensure the tip remains within the sulcus during use.
The movement should be akin to walking the probe along the designated area.
Instrumentation (How to Move the Instrument)
Moving the instrument effectively involves understanding:
Insertion: Introducing the instrument into the sulcus/pocket suitably.
Adaptation: Ensuring the tip follows the contour of the tooth at all times.
Angulation: The angle relative to different perspectives (buccal, lingual, mesial, distal).
Stroke: The direction and method of movement (e.g., vertical, oblique, horizontal).
Instrumentation: Insertion
Proper insertion technique:
Glide the instrument into the sulcus gently.
Assess resistance to discern whether it is due to calculus or the depth of the sulcus/pocket.
Instrumentation: Adaptation & Angulation
Importance of adaptation and angulation:
Adaptation: Ensuring the tip maintains contact with the tooth contour.
Angulation: Considers how the instrument aligns with the tooth from various perspectives.
Instrumentation: Adaptation
Clarification of adaptation:
The relationship of the shank and/or the working end in relation to the tooth must be maintained continuously.
Instrumentation: Stroke
The stroke can be characterized by its movement:
May move vertically, obliquely, or horizontally depending on the application and position.
Additional Notes
Items mentioned to not be on the test and not deemed disposable include ZIRC 7730.
Certain items and concepts are also marked as not relevant for assessment.
Conclusion
Comprehensive details from the design, utilization, and techniques pertaining to dental instruments were covered. Each instrument has a specialized role in creating effective assessments, ensuring precision and care in patient evaluation.