Chairside positioning and instrument transfer: Dental assisting

During dental procedures, optimal chair-side positioning and efficient instrument transfer are accomplished through team dentistry, also known as fore-handed dentistry.

Foe-handed dentistry is a concept where dentists and dental assistants, using their forehands together, deliver streamlined and effective patient care during dental procedures.

It emphasizes the principle of motion economy, ergonomically correct positioning, operating zones, and efficient instrument transfer to achieve optimal visualization of the oral cavity, reduce fatigue, and support safe instrument transfer.

As a dental assistant, understanding four-handed dentistry is essential for providing safe and effective dental care. OK, let's start by discussing how the principles of motion economy can conserve energy while performing tasks.

As a dental assistant, you'll perform many physical tasks during patient care, involving your torso, arms, elbows, wrists, hands, and fingers.

For example, you may need to pass instruments to the dentist, mix dental materials, reposition equipment, or bend and twist your upper body to visualize the oral cavity.

Over time, these movements can place cumulative stress on your body and lead to fatigue, low back pain, circulatory problems, and other musculoskeletal problems.

To reduce this strain, dental teams use the principles of motion economy, which involve performing physical tasks in ways that conserve energy and minimize unnecessary movement.

In practice, motion economy means using small, efficient movements of the fingers, wrist, and elbow whenever possible, while avoiding larger arm and torso movements that can increase fatigue and strain.

Examples include arranging trays in the order they'll be needed during a procedure, using proper grasp techniques when handling instruments, anticipating the need for an instrument and passing it to the dentist before it's asked for, and employing moisture control techniques such as suction to enhance visualization.

OK, let's dive into the principles of team positioning. The goal of team positioning is to create an ergonomic work environment, which simply means designing a patient care area that's optimized for a clear visualization of the oral cavity, efficiency, safety, and comfort through correct positioning of the patient, the dentist, and the dental assistant.

Begin by positioning your patient in the dental chair, ensuring your patient's head is fully supported by the headrest. Patients should be placed in a supine or completely reclined position for maxillary treatments, and in a semi-supined or slightly upright position for mandibular treatments.

Also, always remember to communicate with your patients when you adjust the chair to ensure their safety. From there, the operator, who is typically the dentist, positions themselves next to the patient's head in a way that provides a clear line of sight to the treatment area.

To reduce strain on the operator's neck, they'll instruct patients to turn or tilt their head or chin as needed, to achieve optimal visualization of the oral cavity, which reduces strain on the operator's neck.

The operators should sit all the way back in their stool, making sure the backrest supports their lower back. The height of the stool is adjusted, so the operator's thighs and forearms are parallel to the floor, and their feet are flat on the floor.

As the dental assistant, you'll take your position on the other side of the patient opposite the dentist. You'll also sit in a neutral, ergonomic position, with your line of sight about 4 to 6 inches higher than the operators, which allows you to see the treatment area clearly and assist efficiently throughout the procedure.

You may need to rest your feet on the base or foot ring of the stool, since you'll be slightly elevated off the floor. Next, let's discuss operating zones, which help identify the position of the members of the dental team.

To understand operating zones, imagine a patient lying in a dental chair, and picture a clock over the patient's face. 12 o'clock is in line with the top of the patient's head, and 6 o'clock is towards their feet.

There are 4 operating zones, and their positions vary slightly depending on whether the operator is right or left-handed.

The first zone is the operator's zone, which is where the dentist who is performing the procedure is positioned. For a right-handed operator, this zone extends from 7 to 12 o'clock.

And for a left-handed operator, it extends from 12 to 5 o'clock. The second zone is the transfer zone, where instruments are safely passed between the operator and assistant directly over the patient's chest.

For a right-handed operator, this zone extends from 4 o'clock to 7 o'clock. And for a left-handed operator, it extends from 5 to 8 o'clock.

Next is the assistant zone. This is where you'll be positioned as the dental assistant.

If you're right-handed, it's located from 2 to 4 o'clock. And if you're left-handed, it's located from 8 to 10 o'clock.

Lastly, the static zone is located behind the patient's head, and is used for supplies that aren't frequently moved during procedures.

It's located from 12 to 2 o'clock for right-handed operators, and 10:00 to 12 o'clock for left-handed operators. All right, now let's look at how to improve workflow and safety by efficiently transferring instruments to allow the operator to remain focused on the operative field.

Throughout the procedure, you'll anticipate the dentist's needs, and have the correct instruments and other dental materials ready at the appropriate time.

This will require you to learn the procedure sequence, so you can prepare instruments and transfer them smoothly. In addition, instruments must be passed in the position of use and placed firmly into the operator's hand with minimal movement.

When working with a right-handed operator, transfers are typically performed with your left hand, so your right hand can provide suction and moisture control.

In addition, you'll use a single-handed technique when transferring or receiving relatively light items, and you'll use a two-handed technique for more bulky or heavy items.

Now, you'll also need to grasp instruments appropriately, based on the design and function of each instrument. So, instruments can be placed correctly in the operator's hand.

Common instrument grasps include the pen grasp, palm grasp, and palm thumb grasp. There are also some instruments that require additional care when transferred.

Hinged instruments like scissors or surgical forceps are held at the hinges, and passed so the operator can easily place their fingers in the handles.

Handpieces are positioned for immediate use with the working end toward the dentist, and cotton pliers, which move small items like cotton pellets or wedges to and from the oral cavity, are oriented toward the operative field to support efficient continuous workflow.

As a dental assistant, you'll play a key role in assuring the ergonomic workspace and patient comfort during dental procedures.

Preparing for and anticipating the steps of a dental procedure ensures that instruments, materials, and equipment are organized and ready for use and transfer.

These techniques help maintain smooth workflow and protect the dental team and patient from injury, while allowing the dentist to maintain focus and visualization of the treatment field.

All right, it's a quick recap. Four-handed dentistry or team dentistry emphasizes efficiency and teamwork among members of the dental team.

By applying the principles of motion economy, team positioning, ergonomics, and proper instrument grasps and instrument transfer, you'll promote the provision of safe and effective patient care.