Chairside positioning and instrument transfer: Dental assisting

During dental procedures, optimal chairside positioning and efficient instrument transfer are accomplished through team dentistry, also known as four-handed dentistry. Four-handed dentistry is a concept where dentists and dental assistants, using their four hands together, deliver streamlined and effective patient care during dental procedures.

It emphasizes the principles 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.

Okay, 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.

Okay, 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 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-supine, 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 will 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 operator 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 four to six inches higher than the operator’s, 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. Twelve o'clock is in line with the top of the patient’s head and six o’clock is towards their feet.

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