Aufa, Marsha Muhammad (2026) Analisis Dan Karakterisasi Pengaruh Filler Hidroksiapatit Dan Selulosa Nanokristal Dengan Pelarut PEG Dan AgNO3 Pada Hasil Modifikasi Alginate Dental Impression. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Alginat masih banyak digunakan sebagai bahan cetak gigi (dental impression) karena kemudahan manipulasi dan biaya yang relatif rendah, material ini memiliki keterbatasan berupa kekuatan sobek dan tarik yang rendah, kecenderungan mengalami sineresis, serta elastisitas yang lebih rendah dibandingkan bahan cetak elastomerik. Penelitian ini bertujuan untuk meningkatkan sifat mekanik dan stabilitas dimensi alginat Jeltrate melalui modifikasi filler reinforcement fisik hydroxyapatite (HAp) dan cellulose nanocrystal (CNC) yang dikombinasikan dengan sistem pelarut AgNO₃ dan PEG, dalam sepuluh variasi komposisi (konsentrasi HAp 1&2%, CNC 2&4%, AgNO₃ 0,2%, dan PEG 1%, baik secara biner maupun tiga komponen). Hasil pengujian mekanik menunjukkan bahwa seluruh formula modifikasi mengalami peningkatan dibandingkan kontrol negatif (tensile strength 0,203 MPa; tear strength 1,19 N/mm; elastic recovery 94,46%). Tensile strength tertinggi diperoleh pada formula CNC 2% + HAp 1% + AgNO₃ 0,2% sebesar 0,370 MPa (meningkat 82,3%), tear strength tertinggi pada HAp 1% + PEG 1% sebesar 1,72 N/mm (meningkat 44,2%), dan seluruh sepuluh formula berhasil melampaui ambang elastic recovery standar ADA No. 18 (>95%), dengan nilai tertinggi 99,36% pada CNC 2% + HAp 1% + AgNO₃ 0,2%. Pengujian reproduction of detail menunjukkan delapan dari sepuluh formula berhasil mereproduksi ketiga garis standar ISO 1563 (75, 50, dan 25 µm) secara kontinu, berbeda dengan kontrol yang gagal mereproduksi garis 25 µm. Sebaliknya, pengujian dimensional volumetric changes pada kondisi delayed pouring (0–240 menit). Pada kontrol negatif menyusut 18,48%, sedangkan formula CNC 2% + HAp 1% + AgNO₃ 0,2% menyusut 28,32%. Pengujian karakteristik yang dilakukan meliputi FTIR dan SEM-EDX mengkonfirmasi keberadaan filler melalui puncak gugus fungsi dan elemental mapping mengkonfirmasi distribusi partikel HAp sebagai klaster diskret (korespondensi Ca dan P), sementara ion Ag⁺ terdistribusi homogen independen dari klaster tersebut. Hasil ini menunjukkan bahwa modifikasi filler dan solvent yang dilakukan berhasil mendekatkan karakteristik elastic recovery dan reproduction of detail alginat Jeltrate terhadap bahan cetak elastomerik.
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Alginate is still widely used as a dental impression material because it is easy to handle and relatively inexpensive. However, it has several limitations, including low tear and tensile strength, a tendency to undergo syneresis, and lower elasticity than elastomeric impression materials. This study aims to improve the mechanical properties and dimensional stability of Jeltrate alginate through physical filler reinforcement using hydroxyapatite (HAp) and cellulose nanocrystals (CNC), combined with a solvent system consisting of AgNO₃ and polyethylene glycol (PEG), in ten compositional variations (HAp concentrations of 1% and 2%, CNC concentrations of 2% and 4%, AgNO₃ at 0.2%, and PEG at 1%, applied in both binary and ternary systems). The mechanical testing results showed that all modified formulations exhibited improved performance compared with the negative control (tensile strength: 0.203 MPa; tear strength: 1.19 N/mm; elastic recovery: 94.46%). The highest tensile strength was achieved by the formulation containing 2% CNC + 1% HAp + 0.2% AgNO₃, reaching 0.370 MPa (an increase of 82.3%), while the highest tear strength was obtained by the 1% HAp + 1% PEG formulation, reaching 1.72 N/mm (an increase of 44.2%). All ten formulations exceeded the ADA Specification No. 18 requirement for elastic recovery (>95%), with the highest value of 99.36% recorded for the 2% CNC + 1% HAp + 0.2% AgNO₃ formulation. The detail reproduction test demonstrated that eight of the ten formulations successfully reproduced all three ISO 1563 standard lines (75, 50, and 25 µm) continuously, whereas the control failed to reproduce the 25 µm line. In contrast, the volumetric dimensional change test conducted under delayed pouring conditions (0–240 minutes) showed that the negative control exhibited 18.48% shrinkage, while the formulation containing 2% CNC + 1% HAp + 0.2% AgNO₃ exhibited 28.32% shrinkage. Characterization using FTIR and SEM-EDX confirmed the presence of the fillers through characteristic functional group peaks, while elemental mapping verified that HAp particles (represented by Ca and P) were distributed as discrete clusters, whereas Ag⁺ ions were dispersed homogeneously and independently of these clusters. Overall, these findings indicate that the filler and solvent modifications successfully improved the elastic recovery and detail reproduction characteristics of Jeltrate alginate, making its performance closer to that of elastomeric impression materials.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Bahan Penguat, Cetakan Gigi Alginat, Modifikator Pelarut, Sifat Mekanik, Stabilitas Dimensi, Alginate Dental Impression Materials, Dimensional Stability, Mechanical Properties, Reinforcing Materials, Solvent Modifiers |
| Subjects: | Q Science > QD Chemistry > QD251.2 Chemistry, Organic. Biochemistry Q Science > QD Chemistry > QD320 Cellulose. Hydrolysis |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | Marsha Muhammad Aufa |
| Date Deposited: | 23 Jul 2026 06:54 |
| Last Modified: | 23 Jul 2026 06:54 |
| URI: | http://repository.its.ac.id/id/eprint/136036 |
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