February 20, 2013 David Alvarado Ethan Kruder Kirk Santure Jessica Spoll

 Initial Problem Statement  Customer Needs Assessment ◦ Hierarchal Customer Needs ◦ Pairwise Comparison Chart ◦ Weighted Hierarchal Customer Needs  Revised Problem Statement  External Search ◦ Product Dissection ◦ Patent Search ◦ Product Archaeology ◦ Benchmarking  Concept Generation ◦ Morphological Charts ◦ Pugh Charts / Concept Selection  Final Design

Revised Problem Statement: Our mission is to redesign an electric toothbrush so that it is sustainable and consumer friendly. According to the customer assessments, it is important that the toothbrush have a rechargeable battery and be somewhat lightweight. It is also important that the bristles be uniquely designed to be better at cleaning teeth and increasing dental hygiene. Our design will also aim to improve the grip, and to make it more ergonomic and user-friendly.

 To aid our redesign process, we collected external research: ◦ History of electric toothbrushes on the market ◦ Cost of other products on the market ◦ Patented features already in existence  We completed benchmarking tables with information about features of other electric toothbrushes on the market: ◦ Battery life ◦ Noise level ◦ Bristle Design ◦ Grip

FeatureOralB (our toothbrush)Crest SpinbrushColgate MotionPhillips Sonicare Battery life / Power41 days – batteries53 days - batteries65 days - batteriesRechargeable battery Noise level70 dB22.25 dB86 dBVery loud (unknown specifics) Bristle designSmall oscillating circleBlue color signal bristlesSmall oscillating circle plus large brush Larger brush head for whitening and removing plaque Cost16.99$14.90$6.99$99.95$ Grip/ComfortBlue rubber gripVaried color rubber gripsGreen rubberWhite and light blue plastic FeatureOralB (our toothbrush)Crest SpinbrushColgate MotionPhillips SonicareCategory Weight Battery life / Power123540% Noise level352110% Bristle design234535% Cost545110% Grip/Comfort33245% Total score (weighted) Rank4321 These charts helped us determine which features made other existing toothbrushes successful, and thus were used to help us with our concept generation.

Dual action head Outside spins clockwise, inside spins counter clockwise Split head design Inner circle of bristles oscillate Intricate bristle design rotates clockwise Inner and outside section oscillate independent of each other

Grip has space on back for fingers Grip design provides space for thumb and index finger Toothbrush shape is wide in the middle and tapered at the ends Finger grips on the side enhance ability to grip toothbrush Basic electric toothbrush design with a curved grip and square bottom Design similar to non-electric toothbrush, very skinny and easily fits in your hand

Conveyor belt system constantly spins head in one direction Drive shaft system, the wheel on the bottom will rotate causing the brush head to spin Motor with a piston that fires vertically causing the brush head to oscillate Servomotor will spin the head and then return to its original position Magnetic drive shaft, magnets will push and pull drive shaft connected to brush head Pulley system will allow cables to twist brush head

USB charger, plugs into outlet and bottom of toothbrush Multiple battery packs that can be easily removed and put on charger Charger that is powered by solar panel Charger is connected to hamster wheel for unlimited power source Charging station allows for storage and charging of battery Charging basket provides a place to wirelessly charge toothbrush and store toothpaste

Brush Head Design Iteration 1Iteration 5 SustainabilityPortabilityUser-FriendlySumRankSustainabilityPortabilityUser-FriendlySumRank Weighting Weighting Concepts Iteration 2Iteration 6 Concepts Iteration 3Iteration 7 Concepts Iteration 4Iteration 8 Concepts

Iteration 1Iteration 5 SustainabilityPortabilityUser-FriendlySumRankSustainabilityPortabilityUser-FriendlySumRank Weighting Weighting Concepts Iteration 2Iteration 6 Concepts Iteration 3Iteration 7 Concepts Iteration 4 Concepts Energy Mechanism for Brush Head

Iteration 1Iteration 5 SustainabilityPortabilityUser-FriendlySumRankSustainabilityPortabilityUser-FriendlySumRank Weighting Weighting Concepts Iteration 2Iteration 6 Concepts Iteration 3Iteration 7 Concepts Iteration 4Iteration 8 Concepts Power Generation

Iteration 1Iteration 5 SustainabilityPortabilityUser-FriendlySumRankSustainabilityPortabilityUser-FriendlySumRank Weighting Weighting Concepts Iteration 2Iteration 6 Concepts Iteration 3Iteration 7 Concepts Iteration 4Iteration 8 Concepts Body Design and Human Factors

 We averaged the rankings from each iteration to get the top ranked concept in each category to get our final design.

For the head we have an alternating rotation of the bristles. Outside bristles rotate in the opposite direction of the inside bristles. The body features an ergonomic handle built for comfort. It comes with a charging base that can be plugged into the wall. The toothbrush is powered by a servomotor which spins the head of the toothbrush.