Brush - ergonomics

Owned By Sonali Dhasmana

Brush


SUBMITTED BY

Sonali Dhasmana


Subject Pooja Kumari

Brush being used Pepsodent – Zig-Zag (sometimes oral-B)

Toothpaste Colgate

Total times used in a day Twice

Total time of usage 1 to 1 ½ minute(at one time)

Time of usage After waking up from slumber

Material of the brush Plastic and rubber


Anthropometric measurements


The brush135o

135o A Brush is basically used for cleaning

the teeth.

mm

mm

mm

mm

mm


While using the brush

• Rapid to and fro motions during brushing of the front molars.• Circular movements in the back teeth.• Upright while brushing the inner teeth.• Her elbow is in motion(moves with the brush).(the figure on left)• Though sometimes we can make out imperceptible wrist movement.


Clutching the brush

Thumb is exactly at the upper curve of the base of the angled neck.


The prints on a brush of where she puts her fingers.This also shows the intensity of the pressure that varies from finger to finger.For ex. Pressure of the thumb and the index finger is greater than the last three fingers.


The places where the pressure is exerted most by her digits during brushing.


Other Details

• She likes the color Blue and green.

• Elbow is creased at an angle of 45o

• The inner part is at about 35o

• The shoulder is at right angle to the arm while brushing.


• Loves Zig-Zag bristles(believes that normal bristles will not reach middle of the teeth)

• Feels uneasy if does not brush – like missing something important.

• Keeps her brush in an old jug along with her toothpaste, scrub and face-wash.


• She prefers the metal tongue-cleaner over the rubber tongue-cleaner on the brush – says that it feels highly ineffectual.

• When asked how she perceives her toothbrush – says that it is perfect for her and is very comfortable with it.


The problems faced

The problems faced by her(which I perceived) are

• Continual change of hand positions during the process.

• The brush slips a little – brush is thinner than what she should be using. So it feels a little insubstantial in hand – when pointed out to her is a little surprised and agrees.

• The bristles, after only 6 days of usage, are frayed.


Design

Brush - ergonomics