Curable Dental Composition Shortens Setting Time
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Solution Overview
Problem
Current dental compositions face challenges with prolonged setting times, potential gas bubble formation leading to voids in gypsum casts, and a need for improved curing behavior, including a balance between maintaining a long working time and reducing setting time while ensuring the composition remains safe for patient use.
Innovation Solution
A curable dental composition that generates energy, specifically heat, through a system present in the composition, which accelerates the hardening reaction without excessively increasing temperature, allowing for a reduced setting time while maintaining an acceptable working time and ensuring patient safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional addition crosslinked silicone materials are used, then the composition remains stable during storage, but the setting time is prolonged
Solution Approach 1:
The patent introduces a retarding agent that preemptively controls the timing of the setting reaction. The retarding agent is incorporated into the composition beforehand and remains inactive during storage, then activates at a predetermined moment to initiate rapid setting, thus resolving the contradiction between storage stability and setting time without requiring external triggers during the procedure.
Solution Approach 2:
The patent employs a catalyst system where the activation energy or catalytic activity is modulated to control reaction kinetics. By adjusting catalyst concentration or type, the composition maintains stability during storage but can be triggered to set rapidly when needed, achieving both long storage stability and short setting time through parameter optimization.
2Loss of time
If the setting reaction is accelerated, then the setting time is reduced, but gas bubbles are formed leading to voids in gypsum casts
Solution Approach 1:
The patent introduces a retarding agent as an intermediary substance that mediates between the crosslinking reaction and gas evolution. This agent selectively inhibits the reaction pathway that produces gas bubbles while allowing the crosslinking to proceed, enabling rapid setting without the harmful side effect of gas formation that would create voids in gypsum casts.
Solution Approach 2:
The patent converts the potentially harmful rapid exothermic reaction into a beneficial controlled setting process. By using a retarding agent to moderate the reaction kinetics, the heat generation is controlled to prevent violent gas evolution, and the reaction energy is channeled productively into crosslinking rather than harmful gas bubble formation.
3Duration of action of moving object
If a longer working time is maintained, then the composition remains workable, but the setting time is prolonged
Solution Approach 1:
The patent creates a two-stage reaction profile where the composition first remains in a slow-reacting state for an extended working period, then transitions to a rapid setting phase. This periodic action pattern, controlled by the retarding agent, allows the dentist to work with the material for an extended time and then quickly complete the setting process when ready.
Solution Approach 2:
The retarding agent is incorporated beforehand to preemptively control the reaction timeline. It maintains the composition in a workable state during the entire working time period, then activates at the transition point to initiate rapid setting, ensuring both long working time and short setting time are achieved through预先 designed reaction control.
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 energy-generating system effectively shortens the setting time of the dental composition without compromising the working time, resulting in a homogeneous product free of gas bubbles, suitable for dental impressions and ensuring the gypsum casts are void-free, thus enhancing the dental procedure's efficacy.
Implementation Method 1
a system being able to generate energy (e.g. heat), thus providing a self-warming composition
Data Source
Figure 1
AI summary
The invention relates to a curable dental composition being prepared by mixing a base paste and a catalyst paste, " the base paste comprising component(s) (A) with curable moieties (AC), " the catalyst paste comprising a catalyst (C) being able to initiate or catalyse a crosslinking reaction involving components (A) upon mixing base paste and catalyst paste, the curable composition comprising a component (X) with reactive moieties, component (X) being either produced during the curing reaction or being present in either the base paste or the catalyst paste before the crosslinking reaction is initiated or catalysed, component X being different from component(s) (A), either base paste or catalyst paste comprising a reactant (Y), reactant (Y) being able to interact with component (X), but not taking part in the crosslinking reaction, the curable composition being able to produce energy in an amount sufficient to increase the temperature T1 of the composition being present 20 s after mixing the base paste and the catalyst paste to a temperature T2 being from about 6 to about 20 °C above T1.