Integrated Jaw Relation Recorder for Single-Visit Facebow Transfer

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Solution Overview

Problem

Current dental devices lack a single, universally accepted method for accurately and precisely recording centric jaw relation and orientation jaw relation simultaneously, particularly for both dentulous and edentulous subjects, leading to potential inaccuracies in prosthesis fabrication and requiring multiple patient appointments.

Innovation Solution

A device comprising a calibrated rod, slider, and arcuate grip with adjustable reference points, including a nasion pointer and orbital pointer, that guides the mandible to achieve the most anterior and superior condyle position in the glenoid fossa, allowing for simultaneous recording and transfer of centric and orientation jaw relations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional separate methods are used to record centric jaw relation and orientation jaw relation, then each can be recorded independently, but multiple patient appointments are required and time is lost

Engineering Contradiction:

Improveaccuracy of jaw relation recordingVSAvoidnumber of patient appointments

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent combines two separate recording functions (centric jaw relation recording and orientation jaw relation/facebow transfer) into a single integrated device. The device includes both a centric relation recorder with calibrated scales and a facebow assembly with reference point indicators, allowing both measurements to be obtained simultaneously during one patient visit, thereby eliminating the need for multiple appointments while maintaining measurement accuracy.

Inventive Principle:

Principle #5Merging (Combining)

2Reliability

If multiple separate devices are used for centric relation and facebow transfer, then each function can be performed with dedicated equipment, but device complexity increases and ease of operation decreases

Engineering Contradiction:

Improveaccuracy of condyle positioningVSAvoidnumber of separate devices required

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent integrates the centric relation recorder and facebow assembly into a single unified device that can perform both functions simultaneously. The device includes a headrest assembly with calibrated scales for centric relation measurement and reference point indicators for facebow transfer, eliminating the need for multiple separate devices while maintaining the reliability of condyle positioning through its guided mechanism.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The device is designed with multi-functionality to perform both centric jaw relation recording and orientation jaw relation (facebow) transfer using a single apparatus. The integrated design allows the device to serve multiple purposes: positioning the mandible for CR recording, transferring facial reference points for facebow orientation, and providing guided condyle movement, thereby reducing device complexity while maintaining functional reliability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of operation

If subjective judgment is used to determine condyle position, then the operator can use experience and skill, but measurement precision and reliability decrease

Engineering Contradiction:

Improveoperator skill requirementVSAvoidaccuracy of condyle position determination

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent replaces subjective operator judgment with an objective mechanical guidance system. The device includes calibrated scales, reference point indicators, and a guided movement mechanism that mechanically directs the mandible to the correct condyle position. This mechanical system provides precise, repeatable positioning independent of operator experience or skill level, thereby improving measurement precision while maintaining ease of operation through standardized mechanical guidance.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS11259907B2Device for recording centric jaw relation and orientation jaw relation simultaneously

Publication Date: 2022.03.01 PALASKAR JAYANT NANDKUMAR

AI summary

The device for recording centric jaw relation and orientation jaw relation simultaneously is disclosed that provides an accurate and precise recording of centric jaw relation as well as orientation jaw relation recording and transfer. The device includes a central bar, a centric relation recorder, a dentulous adjustable fork or an edentulous fork, a semi-circular frame, a nasion pointer and an orbital pointer. The central bar is received by a plurality of clamping assemblies that adjustably position the nasion pointer, the adjustable fork or the edentulous fork and the centric relation recorder respectively. The device can be used in case of both, dentulous as well as edentulous subjects. The device can advantageously transfer the centric relation record to any semi-adjustable articulators or non-adjustable articulators.