Investigation of Aging in Dental Nanocomposites
DEUISGR 2025 (4th International Symposium on Graduate Research), İzmir, Türkiye, 17 - 19 Aralık 2025, ss.100-101, (Özet Bildiri)
- Yayın Türü: Bildiri / Özet Bildiri
- Basıldığı Şehir: İzmir
- Basıldığı Ülke: Türkiye
- Sayfa Sayıları: ss.100-101
- Dokuz Eylül Üniversitesi Adresli: Evet
Özet
The structure and functions of dental tissue have
a decisive impact on individuals’ overall quality of life. Material loss
resulting from dental caries adversely affects both the mechanical strength and
the aesthetic appearance of the tooth, thereby necessitating restorative
treatments. Today, composite resin–based restorative materials have largely
replaced amalgam fillings. With advancements in filler particle size,
nanocomposites containing nanoscale fillers have been developed, offering
significant advantages in terms of aesthetics, mechanical strength, and wear
resistance.
This study aims to investigate how the mechanical
properties of nanohybrid composites with three different nanofiller ratios
change before and after accelerated aging. The commercial products Optishade,
3M Z550, and Grandio were used in the study. The specimens were prepared in
Teflon molds produced via 3D printing in accordance with international
standards and were polymerized using an LED light-curing device according to
the manufacturers’ specifications. A total of 108 control and aged specimens
were produced. Mechanical evaluations were conducted using compressive strength
testing, three-point flexural strength testing, and Vickers microhardness
testing. The compressive strength test measures the material’s resistance to
fracture under uniaxial loading, while the flexural test determines the
strength developed when a load is applied between two support points. Vickers
hardness measurements provide insight into surface resistance and the
microstructural integrity of the material.
For the aging procedure, an artificial saliva
solution compliant with the DIN 53160-1 standard was used. The specimens were
exposed to an accelerated aging cycle for 7 days at 37 °C and 95–100% relative
humidity in an Ascott CC1000ip chamber. This protocol simulates the chemical
and thermal effects of the intraoral environment under laboratory conditions.
Mechanical tests on the control group specimens have been completed, and
testing of the aged specimens has commenced. By comparing the results, the effects
of filler ratio and nanoscale particles on resistance to aging will be
assessed. This will enable a more comprehensive understanding of how moisture,
temperature, and chemical factors encountered in clinical conditions influence
the performance of composite restorations.
The findings obtained from this study are
expected to contribute to the evaluation of the long-term durability of
nanohybrid composites and to strengthen the scientific basis for the selection
of dental restorative materials.