The aim of this study was to determine the effects of glass and polyethylene fibers on the color and translucency change of bulk-fill and anterior composites before and after artificial accelerated aging (AAA). Two types of teflon molds were used to fabricate samples which were 13 mm in diameter and, respectively, 2 mm and 4 mm in height. Polyethylene fiber (PF) and glass fiber (GF) were incorporated in the middle of the composite samples. Color and translucency changes of each composite were evaluated before and after AAA with spectrophotometer. ANOVA and Tukey's HSD post hoc statistical analysis were used at a significance level of 0.05. Before AAA (for anterior composites), there were no significant differences in L* and b* parameters among the three groups (p > 0.05); there were no significant differences in L* parameter between PF and GF groups or in TP between GF and control groups (p > 0.05) (for bulk-fill composites). After AAA, there were no significant differences in L* parameter between GF and control groups, in a* parameter between PF and control groups, in b* parameter among all groups, or in TP parameter between GF and control groups (p > 0.05). Fiber reinforcement led to color and TP change in both anterior and bulk-fill resin composites.

Objective In the present study, the ability of posterior resin composite to repair aged bulk‐fill resin composite and vice versa were assessed by shear bond strength testing. Materials and Methods Resin composite substrates were aged and surfaces were abraded with abrasive papers, then bulk‐fill substrates were repaired with posterior resin composite and vice versa using different surface treatments (no surface treatment [control]; etching with 37% phosphoric acid [H3PO4] for 20 seconds; etching with 10% hydrofluoric acid [HF] for 20 seconds; etching with 37% H3PO4 for 20 seconds + adhesive application; etching with 10% HF for 20 seconds + adhesive application; adhesive application only). Shear bond strengths (SBS) were then measured and surface roughness values (Ra) were determined. Cohesive strengths of nonaged resin composites were measured and used as reference groups. Resin composite surfaces after acid etching were evaluated by SEM. Data were analyzed using ANOVA and Fisher's LSD tests (P < .05). Results ANOVA showed that resin composite repair type did not affect SBS significantly (P = .850), while it showed that surface treatments significantly affected the SBS (P = .000). Only a combination of etching with 10% HF for 20 seconds with resin adhesive application provided similar SBS values with those of the positive control. Conclusions It was concluded that the aged bulk‐fill resin composite would be effectively repaired with conventional posterior resin composite or vice versa if proper repair protocol was deployed. Clinical Significance The combination of 10% HF etching and adhesive application would provide efficient repair strength when the aged bulk fill resin composite is repaired with conventional posterior resin composite or vice versa.

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Amaç: Bu çalışmanın amacı diş hekimliği fakültesi öğrencileri arasında sınav döneminde algılanan stres düzeyi ile bruksizm, temporomandibular rahatsızlıkların (TMR) ilişkisini değerlendirmektir. Gereç ve Yöntemler: Diş Hekimliği Fakültesi 4. Ve 5. Sınıf öğrencilerinden gönüllü olan 102 kişiye sınav haftasından 4 hafta önce ve sınav haftasında sosyodemografik ve alışkanlıkları içeren sorular ile Fonseca Anamnestik Indeksi (FAI) ve Algılanan Stres Ölçeği (ASÖ) anketi yöneltilmiştir. Katılımcıların kendi beyanları esas alınmıştır. Paired Student T test ve Pearson Korelasyon testi kullaanılmıştır. Anlamlılık düzeyi p<0,05 alınmıştır Bulgular: Sınav haftası daha yüksek FAI skorları izlenmiştir. Kadınlar erkeklerden anlamlı derecede daha yüksek FAI ve ASÖ skorları göstermiştir. ASÖ skorları açısından sınav öncesi ve sınav haftası arasında anlamlı fark yoktur. FAI ve ASÖ skorları değişimleri arasında yüksek pozitif korelasyon vardır. Sınıf düzeyi ve aile yanında yaşamak FAI ve ASÖ skorlarını etkilememiştir Sonuç: Sınav FAI ve ASÖ skorlarını artırmaktadır. Bruksizm ve algılanan stres arasında güçlü bir ilişki gözlemlenmiştir. Stres bir bruksizm nedeni olarak gösterilebilir.

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