Dental Prophy Cup Splatter Guard Design

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Solution Overview

Problem

Conventional dental prophy paste compositions with large pumice particles cause splatter during tooth cleaning due to centrifugal forces, leading to contamination and an unpleasant experience for both patients and hygienists.

Innovation Solution

A splatter guard with a proximate edge thinner than the distal edge is attached to a dental hand piece, featuring a mounting end and a distal end that does not reach the longitudinal end of the cleaning cup, allowing the cup to flex and incorporating vanes and dimples to collect and wipe off splatter, reducing contamination and friction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a conventional prophy cup is used with large pumice particles, then the cup can effectively clean teeth, but splatter is generated due to centrifugal forces

Engineering Contradiction:

Improvetooth cleaning effectivenessVSAvoidsplatter contamination

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The harmful splatter is extracted from the system by introducing a splatter guard that collects and contains the centrifugally thrown pumice particles and saliva, preventing their dispersion into the environment while maintaining the cleaning function

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

A splatter guard is introduced as an intermediary component between the rotating prophy cup and the surrounding environment. This guard acts as a mediator that intercepts the splatter generated by centrifugal forces and redirects it, preventing contamination while allowing the cup to continue its cleaning function

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-generated harmful factors

If the splatter guard extends fully to the end of the cup, then splatter containment is maximized, but friction and wear on gears increase

Engineering Contradiction:

Improvesplatter containmentVSAvoidfriction and wear

Core Design Contradiction:

Object-generated harmful factorsVSLoss of energy

Solution Approach 1:

The splatter guard is designed with local quality variation - it extends only to a specific position (e.g., 3mm from the end) rather than covering the entire cup length. This localized extension provides sufficient splatter containment at the critical areas while minimizing contact surface and reducing friction on the drive gears

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Instead of providing full-length coverage, the splatter guard implements partial action by extending only to the necessary degree to contain splatter. This partial extension is sufficient to achieve the containment function while avoiding the excessive friction that would result from full-length contact

Inventive Principle:

Principle #16Partial or excessive action

3Strength

If the proximate edge of the splatter guard is thick, then structural strength is improved, but friction with the rotating cup increases

Engineering Contradiction:

Improvesplatter guard structural strengthVSAvoidfriction

Core Design Contradiction:

StrengthVSLoss of energy

Solution Approach 1:

The splatter guard exhibits local quality variation in its cross-section - the proximate edge (contact area) is made thin to minimize friction, while the distal end maintains greater thickness for structural strength. This gradient design optimizes both functions by placing material where it is most needed

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Instead of making the entire splatter guard thick for strength, the design inverts the conventional approach by making the contact edge thin and the non-contact distal end thick. This inverted thickness distribution reduces friction at the critical contact interface while maintaining overall structural integrity

Inventive Principle:

Principle #13The other way round (Inversion)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The splatter guard effectively contains splatter on the outer lower portion of the prophy cup, preventing contamination and allowing smooth operation of the dental tool, reducing friction and wear on gears, and enhancing hygiene during dental procedures.

Implementation Method 1

This happens when the cleaning paste and saliva are thrown from the edges of the prophy cup due to the centrifugal force generated by the spinning action of the cup

Methodology Applied

Scientific EffectCentrifugal force: Centrifugal Force

Data Source

PatentUS9962236B1Splatter reduction in a small head contra-angle prophy

Publication Date: 2018.05.08 AKHA LLC

AI summary

A splatter guard for a dental cleaning tool eliminates the splatter by gathering splatter first on the outer lower one-third to one-half of the fructoconical prophy cup using combination of vanes and the dimples. As the splatter migrates upwards, the splatter guard wipes off the splatter. The reason the splatter guard is constructed smaller than the cup is because it allows the cup to flex outward without interfering during use thereof. The splatter guard can be attached several different ways, including slide in, snap on, secured between two half-housing members, or formed integrally with the housing, for example. The drive train is housed in a partial split contra angle housing which allows accurate positioning of the gears as it is required to ensure that the cup rotates concentrically and remains in touch with the knife edge of the splatter guard.