Endodontic Access Guide and Drill Kit for Canal Preparation
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Solution Overview
Problem
Current endodontic access cavity preparation methods are challenging due to their reliance on operator skill, which can lead to defects such as craze lines and dentinal cracks, and inadequate preparation can result in instrument separation and aberrations of the canal shape.
Innovation Solution
A drill kit and method for endodontic access cavity preparation that includes a set of drill bits with varying shaft lengths and head lengths, designed to work with an access guide mounted on the patient's teeth, to facilitate precise and efficient drilling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional drilling procedures are used relying on operator skill, then treatment can be performed with simple equipment, but the quality of access cavity preparation is inconsistent and operator-dependent
Solution Approach 1:
The patent introduces a guide needle and guide tube as intermediary devices that mediate between the operator and the drill bit. The guide needle is inserted through the access cavity to mark the canal direction, and the guide tube is attached to the handpiece to constrain the drill bit's path, ensuring precise drilling without requiring advanced operator skill
Solution Approach 2:
The patent performs preliminary actions by inserting the guide needle to locate and mark the canal opening direction before actual drilling begins. The access cavity is prepared with specific dimensions and angles in advance to accommodate the guide devices, ensuring that the subsequent drilling follows the predetermined safe path
2Ease of operation
If excessive access cavity preparation is performed to ensure adequate access, then complete access to root canals is achieved, but unnecessary tooth substance is lost
Solution Approach 1:
The patent applies local quality by creating an access cavity with specific dimensional characteristics - adequate width and depth at the location of the canal opening, but minimal extension in other areas. The guide needle and guide tube ensure that drilling is concentrated precisely where needed, avoiding unnecessary removal of tooth substance from adjacent areas
3Ease of manufacture
If drilling is performed without precise directional control, then the procedure is simpler, but defects such as craze lines and dentinal cracks occur
Solution Approach 1:
The guide needle acts as an intermediary that visually marks the safe drilling path through the access cavity, allowing the operator to follow the marked direction without complex mental visualization. The guide tube attached to the handpiece serves as a mechanical intermediary that physically constrains the drill bit to follow the marked path, preventing deviation that would cause craze lines or cracks
4Reliability
If guided endodontic treatment procedures are used, then dependency on operator skill is reduced, but root canal drilling can still cause defects such as craze lines and dentinal cracks
Solution Approach 1:
The patent changes the geometric parameters of the access cavity - specifically creating a wider and shallower cavity with specific angle requirements - to accommodate the guide needle and guide tube. This parameter change allows the guide devices to be properly positioned and function effectively, providing physical constraints that prevent drilling defects even when operator skill varies
Data Source
AI summary
A set of drill bits and/or burrs for attaching to a hand piece and fitting into an access guide during endodontic access cavity preparation is provided. The drill bits are optionally grouped into two types: a high speed, friction grip attachment type drill bit and a slow speed, latch attachment type drill bit. Each of the drill bits has a different longitudinal length for performing different functions during operation procedures. A method of performing an endodontic access cavity preparation with the set of drill bits is also provided.