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Sains Malaysiana 54(9)(2025): 2243-2251
http://doi.org/10.17576/jsm-2025-5409-11
Evaluation of
Dimensional Stability and Tear Strength: A Preliminary Study on Polyvinyl
Siloxane Impression Material
(Penilaian Kestabilan Dimensi dan Kekuatan Koyakan: Kajian Awal terhadap Bahan Impresi Polivinil Siloksana)
MOHAMAD
FIRDAUS AHMAD1, NURUL IZZAH ROSLI1, ROS ANITA OMAR2,
MUHAMMAD AIDIL ROSLAN3 & NOOR AZLIN YAHYA2,*
1Faculty of Dentistry, Universiti Malaya, 50603 Kuala Lumpur, Malaysia
Diserahkan: 18 April 2025/Diterima:
11 Julai 2025
Abstract
This
study investigated the tear strength and dimensional stability of polyvinyl
siloxane (PVS) impression materials following chemical disinfection and storage
at various intervals. Aquasil Ultra+ was evaluated
for dimensional stability, with 10 specimens fabricated according to American
National Standards Institute/American Dental Association (ANSI/ADA)
Specification No. 19. After 1-h immersion in disinfectant, samples were sealed
and stored for 24 h, 7 days, and 14 days. Dimensional changes were assessed
using an image analyser at 20× magnification. Tear strength was tested in 12
specimens each of Aquasil Ultra+ and Chromaclone, prepared in accordance with American Society
for Testing and Materials (ASTM) 1004 and evaluated using a universal testing
machine at a crosshead speed of 51 mm/min. Statistical analysis included
repeated measures analysis of variance and independent t-tests. The dimensional
stability of Aquasil Ultra+ remained within the ADA’s
0.5% limit across all time points (p = 0.051). Tear strength differed
significantly (p = 0.002), with Aquasil Ultra+
(7.48 ± 1.35 N/mm) outperforming Chromaclone (5.98 ±
0.70 N/mm). Both materials exceeded the minimum acceptable tear strength after
5 min of setting. Clinical implication: Aquasil Ultra+ offers clinicians reliable performance and flexibility in delayed model
fabrication without compromising accuracy or material durability.
Keywords: Dental
impression; dimensional stability; disinfectant; elastomeric materials;
polyvinyl siloxane; tear strength
Abstrak
Kajian ini menilai kekuatan koyakan dan kestabilan dimensi bahan impresi polivinil siloksana (PVS) selepas pembasmian kuman secara kimia dan penyimpanan pada pelbagai selang masa. Aquasil Ultra+ dinilai dari segi kestabilan dimensi dengan 10 spesimen dihasilkan mengikut spesifikasi ANSI/ADA No.
19. Selepas perendaman selama 1 jam dalam bahan pembasmi kuman, sampel dimeterai dan disimpan selama 24 jam,
7 hari dan 14 hari. Perubahan dimensi dianalisis menggunakan penganalisis imej dengan pembesaran 20×. Ujian kekuatan koyakan dijalankan ke atas 12 spesimen masing-masing bagi Aquasil Ultra+ dan Chromaclone yang disediakan mengikut piawaian ASTM 1004
dan diuji menggunakan mesin ujian universal pada kelajuan rentas kepala 51 mm/min. Analisis statistik melibatkan ANOVA ukuran berulang dan ujian-t bebas. Kestabilan dimensi Aquasil Ultra+ kekal dalam had 0.5% yang ditetapkan oleh ADA bagi semua selang masa (p = 0.051). Kekuatan koyakan menunjukkan perbezaan ketara (p =
0.002) dengan Aquasil Ultra+ (7.48±1.35 N/mm) mengatasi Chromaclone (5.98±0.70 N/mm). Kedua-dua bahan melebihi ambang minimum kekuatan koyakan selepas 5 minit pengerasan. Aquasil Ultra+ menunjukkan kestabilan dimensi dan kekuatan mekanikal yang sangat baik walaupun selepas penyimpanan berpanjangan. Implikasi klinikal: Aquasil Ultra+ menawarkan prestasi yang boleh dipercayai dan kefleksibelan dalam pembuatan model tertunda tanpa menjejaskan ketepatan atau ketahanan bahan.
Kata kunci: Bahan elastomerik; bahan pembasmi kuman; impresi pergigian; kekuatan koyakan; kestabilan dimensi; polivinil siloksana
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