Electronic Theses and Dissertation

Reparasi basis gigi tiruan sering menggunakan resin akrilik self-cured yang memiliki kekuatan lentur (flexural strength) rendah sehingga rentan mengalami fraktur. Penelitian ini bertujuan untuk mengetahui pengaruh penambahan nanopartikel zirkonia (nano-ZrO₂) dengan konsentrasi 0,5 wt%, 0,75 wt%, dan 1 wt% terhadap flexural strength resin akrilik self-cured pada reparasi basis gigi tiruan. Penelitian ini merupakan penelitian eksperimental laboratoris dengan desain post-test only control group. Sebanyak 24 spesimen resin akrilik polimerisasi panas berukuran 65 × 10 × 2,5 mm direparasi menggunakan resin akrilik self-cured yang dimodifikasi nano-ZrO₂ dengan konsentrasi 0 wt%, 0,5 wt%, 0,75 wt%, dan 1 wt% (n = 6 per kelompok). Uji flexural strength dilakukan menggunakan metode three-point bending test dengan Universal Testing Machine. Analisis morfologi patahan dan area sambungan reparasi dilakukan menggunakan Scanning Electron Microscope (SEM). Hasil penelitian menggunakan uji one-way ANOVA menunjukkan bahwa penambahan nano-ZrO₂ secara signifikan meningkatkan flexural strength resin akrilik self-cured (p = 0,008). Nilai rata-rata tertinggi diperoleh pada kelompok nano-ZrO₂ 1 wt% sebesar 68,42 MPa, diikuti kelompok 0,75 wt% sebesar 62,22 MPa dan 0,5 wt% sebesar 56,52 MPa, sedangkan kelompok kontrol menunjukkan nilai terendah sebesar 49,51 MPa. Perubahan mode fraktur dari brittle menjadi brittle semi-ductile teridentifikasi pada kelompok resin akrilik yang dimodifikasi nano-ZrO₂. Kesimpulan penelitian menunjukkan bahwa penambahan nano-ZrO₂ dengan konsentrasi 0,5%, 0,75%, dan 1% secara signifikan meningkatkan flexural strength resin akrilik self-cured untuk reparasi basis gigi tiruan, dengan konsentrasi 1 wt% memberikan hasil tertinggi dalam penelitian ini.

Denture base repair is commonly performed using self-cured acrylic resin, which has relatively low flexural strength and is therefore susceptible to fracture. This study aimed to evaluate the effect of zirconia nanoparticles (nano-ZrO₂) at concentrations of 0.5 wt%, 0.75 wt%, and 1 wt% on the flexural strength of self-cured acrylic resin used for denture base repair. This study was an experimental laboratory research with a post-test only control group design. A total of 24 heat-cured acrylic resin specimens measuring 65 × 10 × 2.5 mm were repaired using self-cured acrylic resin modified with nano-ZrO₂ at concentrations of 0 wt%, 0.5 wt%, 0.75 wt%, and 1 wt% (n = 6 per group). Flexural strength testing was performed using the three-point bending test with a Universal Testing Machine. Fracture morphology and repair joint areas were analyzed using a Scanning Electron Microscope (SEM). Data were analyzed using one-way ANOVA followed by the post-hoc Tukey HSD test (α = 0.05). The results showed that the addition of nano-ZrO₂ significantly increased the flexural strength of self-cured acrylic resin (p = 0.008). The highest mean flexural strength was observed in the 1 wt% nano-ZrO₂ group (68.42 MPa), followed by the 0.75 wt% group (62.22 MPa) and the 0.5 wt wt% group (56.52 MPa), while the control group exhibited the lowest value (49.51 MPa). A change in fracture mode from brittle to brittle semi-ductile was observed in the nano-ZrO₂–modified groups. The findings indicate that the addition of nano-ZrO₂ at concentrations of 0.5 wt%, 0.75 wt%, and 1 wt% significantly enhances the flexural strength of self-cured acrylic resin for denture base repair, with the 1 wt% concentration producing the highest improvement in this study.