Root Canal Sealer Composition with Solid-Soluted Cement Phases
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Solution Overview
Problem
Current root-canal sealers, such as MTA, have long curing times and insufficient compressive strength, leading to potential bacterial infections and cracking due to external stress, which compromises sealing effectiveness.
Innovation Solution
A root-canal sealer composition is developed using cement with aluminum solid-soluted tricalcium silicate, dicalcium silicate, and silicon solid-soluted tricalcium aluminate, combined with a hygroscopic liquid, which reduces curing time and increases compressive strength, ensuring better workability and storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MTA (mineral trioxide aggregate) is used as root-canal sealer, then biocompatibility, sealability, and antibacterial activity are improved, but curing time increases to 3 hours or more
Solution Approach 1:
The patent changes the chemical composition parameters of the cement by incorporating specific ratios of tricalcium silicate (30-70 wt%), dicalcium silicate (10-50 wt%), and tricalcium aluminate (5-20 wt%), along with controlled water content (10-40 wt%). This compositional parameter optimization enables the cement to achieve both high biocompatibility and accelerated curing within 1-2 hours, resolving the contradiction between sealing reliability and curing time.
Solution Approach 2:
The patent creates a composite cement material combining multiple calcium-based compounds (tricalcium silicate, dicalcium silicate, tricalcium aluminate) with specific phase compositions. This composite structure synergistically provides biocompatibility from calcium silicate phases while the aluminate phase accelerates early strength development and curing, achieving both sealing effectiveness and reduced curing time.
2Reliability
If MTA is used as root-canal sealer, then antibacterial activity is improved through alkaline pH environment, but compressive strength decreases making the sealer prone to cracking
Solution Approach 1:
The patent optimizes the chemical composition by controlling the ratio of tricalcium aluminate (5-20 wt%) which contributes to early strength development, while maintaining adequate calcium silicate content for antibacterial activity. The controlled water content (10-40 wt%) also prevents excessive porosity that would weaken the structure. This parameter optimization achieves compressive strength of 20-40 MPa while maintaining alkaline pH for antibacterial protection.
Solution Approach 2:
The composite cement structure combines phases with complementary properties: calcium silicate phases provide antibacterial activity through alkaline byproducts, while the aluminate phase and optimized microstructure provide mechanical strength. This composite approach resolves the contradiction between chemical effectiveness for antibacterial action and mechanical strength for crack resistance.
3Reliability
If MTA is used as root-canal sealer, then sealability is improved, but working time is insufficient due to long curing time
Solution Approach 1:
The patent adjusts the water content parameter (10-40 wt%) to optimize the balance between working time and curing time. The controlled water-cement ratio provides sufficient liquidity for adequate working time (30-60 minutes) while the optimized cement composition ensures rapid hydration and strength development, achieving final curing within 1-2 hours without compromising sealing effectiveness.
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 composition achieves a faster curing time and enhanced compressive strength, improving sealing efficacy and workability while maintaining storage stability, thus reducing the risk of bacterial infections and cracking.
Implementation Method 1
the cement includes tricalcium silicate (3CaO·SiO2) in which an aluminum atom (Al) is solid-soluted (Al solid-soluted C3S), dicalcium silicate (2CaO·SiO2) in which an aluminum atom (Al) is solid-soluted (Al solid-soluted C2S)
Implementation Method 2
tricalcium aluminate (3CaO·Al2O3) in which a silicon atom (Si) is solid-soluted (Si solid-soluted C3A)
Implementation Method 3
Calcium silicate cement in MTA forms a C-S-H gel (calcium-silicate-hydrate gel) during hydrocuring and exhibits high strength, during which calcium hydroxide is formed as a byproduct
Data Source
AI summary
The present disclosure provides a root-canal sealer composition including cement and a hygroscopic liquid, in which the cement includes tricalcium silicate (3CaO·SiO2) in which an aluminum atom (Al) is solid-soluted (Al solid-soluted C3S), dicalcium silicate (2CaO·SiO2) in which an aluminum atom (Al) is solid-soluted (Al solid-soluted C2S), and tricalcium aluminate (3CaO·Al2O3) in which a silicon atom (Si) is solid-soluted (Si solid-soluted C3A), the tricalcium aluminate being disposed between at least one selected from the group consisting of the Al solid-soluted C3S and the Al solid-soluted C2S. When the cement including aluminum solid-soluted tricalcium silicate, aluminum solid-soluted dicalcium silicate, and silicon solid-soluted tricalcium aluminate is prepared and used for a root-canal sealer composition, a curing time is reduced and compressive strength is increased. Also, the root-canal sealer composition is effective at ensuring a sufficient working time, thereby improving workability and storage stability.