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Improper leg positioning affects your health and hinders access to the oral cavity:

• The narrow chair back allows more freedom to move around the patient and the ability to position the oral cavity at the proper height.
• A narrow chair back enables a clinician to position their legs around the chair, allowing both the dentist/hygienist and assistant access to the oral cavity from any position.
• With a wide chair back, the legs may be positioned underneath the chair potentially causing circulation issues and raising the oral cavity above a comfortable working height.

Access to the oral cavity can be achieved at an optimal loupe height, allowing the arms to remain in a relaxed position.

• A narrow chair back provides access to the oral cavity without the need for class 4 and 5 movements, potentially reducing the risk of musculoskeletal damage.
• With a narrow chair back, the oral cavity is at a comfortable loupe height- allowing the clinician to work with arms relaxed and elbows at a 90+ degree position.
• A wide chair back can cause the oral cavity to be positioned higher, forcing the clinician to raise their arms and elbows to gain access.

A narrow back chair reduces physical barriers, allowing access to the oral cavity without twisting or bending

• The narrow chair back allows the clinician to work around the patient with the oral cavity at a comfortable loupe height, providing access to the oral cavity without twisting the trunk.
• Placing the knees under a wide chair back can require you to bend and rotate the trunk to gain access.
• Proper positioning allows for consistent focal length and working distance without the need for Class 5 movements.