Fadilah, Rafi Ahmad (2026) Pengaruh Filler Hidroksiapatit Dan Selulosa Nanokristal Serta Modifikasi Sistem Pelarut PEG & AgNO3 Terhadap Kinerja Alginat Dental Impression. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Material cetak berbasis alginat masih banyak digunakan dalam kedokteran gigi karenakemudahan manipulasi dan biaya yang rendah, namun memiliki keterbatasan pada stabilitas dimensi, tear strength, dan elastic recovery dibandingkan elastomer tipe putty. Penelitian ini bertujuan meningkatkan kinerja alginat dental komersial merek Jeltrate (Dentsply) melalui dua pendekatan modifikasi: reinforcement fase padat menggunakan serbuk hydroxyapatite (HAp) pada konsentrasi 1% dan 2% serta cellulose nanocrystal (CNC) pada konsentrasi 2% dan 4%, dan modifikasi fase cair menggunakan polyethylene glycol (PEG) pada konsentrasi 1% dan 2% serta silver nitrate (AgNO₃) 0,2%, termasuk dua formula kombinasi HAp–CNC. Metode pembuatan komposit dengan matriks cetakan gigi alginat dengan merek Jeltrate ini dilakukan dengan cara menambahkan bubuk HAp / CNC / Hap + CNC sebelum dilarutkan dengan air. Di sisi lain, pembuatan komposit dengan modifikator pelarut dibuat dengan cara melarutkan PEG / AgNO3 terlebih dahulu dengan DI, kemudian larutan tersebut dijadikan pelarut Matriks Alginat merek Jeltrate. Karakterisasi dilakukan melalui pengujian FTIR, SEM-EDX, tensile strength, tear strength, elastic recovery, reproduction detail, dan perubahan dimensi volumetrik menggunakan 3D scanning. Hasil FTIR mengkonfirmasi terbentuknya interaksi ikatan hidrogen pada sistem CNC dan PEG, koordinasi ionik Ca²⁺–COO⁻ pada sistem HAp, serta koordinasi ionik Ag⁺–COO⁻ pada sistem AgNO₃, tanpa perubahan kovalen pada backbone polisakarida. Seluruh formulasi modifikasi berhasil meningkatkan elastic recovery di atas ambang batas ISO 4823 (≥96,5%), sementara kontrol Jeltrate gagal memenuhi standar tersebut (94,46%). HAp 1% menghasilkan tensile strength tertinggi (0,47 ± 0,03 MPa, +147% terhadap kontrol) dan reproduction detail hingga 0,025 mm. AgNO₃ 0,2% menghasilkan tear strength tertinggi (1,93 ± 0,05 N/mm, +62%) namun menunjukkan penyusutan volumetrik paling ekstrem (48,48% pada 240 menit). PEG 1% menghasilkan elastic recovery tertinggi di antara aditif tunggal (98,54%) disertai peningkatan reproduction detail hingga 0,025 mm. Formula kombinasi CNC 4% + HAp 2% menghasilkan elastic recovery tertinggi keseluruhan (98,11%) dengan trade-off berupa tensile strength yang kembali ke level kontrol akibat segregasi filler pada total loading 6%. Secara keseluruhan, HAp 1% merupakan formula paling seimbang yang menunjukkan peningkatan konsisten pada seluruh parameter
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Alginate-based impression materials remain widely used in dentistry due to their ease of manipulation and low cost, yet exhibit significant limitations in dimensional stability, tear strength, and elastic recovery compared to elastomeric putty materials. This study aims to improve the performance of commercial Jeltrate alginate (Dentsply) through two modification approaches: solid-phase reinforcement using hydroxyapatite (HAp) powder at 1% and 2% concentrations and cellulose nanocrystal (CNC) at 2% and 4%, and liquid-phase modification using polyethylene glycol (PEG) at 1% and 2% and silver nitrate (AgNO₃) at 0.2%, including two HAp–CNC combination formulas. Alginate-based composites were fabricated using commercial Jeltrate alginate as the matrix. For filler-modified composites, HAp, CNC, or a hybrid HAp/CNC powder was dry-mixed with the alginate powder before the addition of water. For solvent-modified composites, PEG or AgNO₃ was first dissolved in deionized (DI) water, and the prepared solution was subsequently used as the mixing liquid for the Jeltrate alginate matrix. Characterization was performed through FTIR, SEM-EDX, tensile strength, tear strength, elastic recovery, reproduction of detail, and volumetric dimensional change measurements using 3D scanning. FTIR confirmed the formation of hydrogen bonding interactions in CNC and PEG systems, ionic coordination of Ca²⁺–COO⁻ in the HAp system, and Ag⁺–COO⁻ ionic coordination in the AgNO₃ system, with no covalent modification to the polysaccharide backbone. All modified formulations successfully increased elastic recovery above the ISO 4823 threshold (≥96.5%), whereas the unmodified Jeltrate control failed to meet this standard (94.46%). HAp 1% produced the highest tensile strength (0.47 ± 0.03 MPa, +147% over control) and reproduction of detail down to 0.025 mm. AgNO₃ 0.2% yielded the highest tear strength (1.93 ± 0.05 N/mm, +62%) but exhibited the most severe volumetric shrinkage (48.48% at 240 minutes). PEG 1% achieved the highest elastic recovery among single additives (98.54%) along with improved reproduction of detail to 0.025 mm. The CNC 4% + HAp 2% combination produced the highest overall elastic recovery (98.11%) with a trade-off of tensile strength returning to control levels due to filler segregation at 6% total loading. Overall, HAp 1% represents the most balanced formulation, demonstrating consistent improvement across all mechanical parameters and surface fidelity without significant degradation of initial dimensional stability.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Cetakan gigi Alginat, Bahan Penguat, Modifikator Pelarut, Sifat mekanik, Alginate Dental Impression, Filler Reinforcement, Mechanical Properties, Solvent Modificator |
| Subjects: | Q Science > QD Chemistry > QD481 Chemical structure. R Medicine > RK Dentistry T Technology > T Technology (General) > TA404 Materials--Biodegradation T Technology > TP Chemical technology > TP1140 Polymers T Technology > TP Chemical technology > TP248 Nanogels. Nanoparticles. |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | Rafi Ahmad Fadilah |
| Date Deposited: | 23 Jul 2026 04:20 |
| Last Modified: | 23 Jul 2026 04:20 |
| URI: | http://repository.its.ac.id/id/eprint/136334 |
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