Strengths of additions to composite or resin-modified glass-ionomer

详细信息    查看全文

• 作者：Richard H. Sullivan IV^a ; ^{richardsullivan04@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Robert H. Hatch^b ; ^{rhatch@uthsc.edu" class="auth_mail" title="E-mail the corresponding author} ; Daniel M. Stegall^a ; ^{dstegal2@uthsc.edu" class="auth_mail" title="E-mail the corresponding author} ; Crisnicaw Verí ; ssimo^c ; ^{crisnicaw@hotmail.com" class="auth_mail" title="E-mail the corresponding author} ; Daranee Tantbirojn^b ; ^{dverslui@uthsc.edu" class="auth_mail" title="E-mail the corresponding author} ; Antheunis Versluis^d ; ^{antheun@uthsc.edu" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Self-etch adhesive ; Resin-based composites ; Resin-modified glass-ionomer ; Strength
• 刊名：International Journal of Adhesion and Adhesives
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：69
• 期：Complete
• 页码：86-90
• 全文大小：514 K

文摘

Adding a new layer of material to cured resin-based composite (RBC) or resin-modified glass ionomer (RMGI) restorations is necessary in dental practice. This study investigated strengths of additions to the two materials.

Material and methods

Beam-shaped specimens were made from monolithic RBC or RMGI, or additions of RBC and RMGI onto RBC or RMGI half-bar substrates. For the additions, the substrates were left undisturbed or were ground with silicon carbide paper followed by the application of a self-etch adhesive. Sample size was 10. Flexural strengths were determined by a 4-point bending test in a universal testing machine. Results were statistically analyzed with one-way ANOVA followed by Student–Newman–Keuls post-hoc test (α=0.05).

Results

Flexural strength of the monolithic RBC (86.7±21.8 MPa) was significantly higher than RMGI (52.6±13.1 MPa). Addition of RBC to cured RBC significantly reduced flexural strength regardless of the substrate surface conditions (34.1±11.5–45.7±21.1 MPa). Addition of RMGI to cured RMGI did not significantly reduce flexural strength (36.2±8.4–52.7±25.2 MPa). Flexural strength of RBC added onto cured RMGI that was ground and bonded was the lowest (21.5±10.0 MPa). Most specimens from this group exhibited adhesive failure.

Conclusions

RBC/RBC additions reduced flexural strength whereas flexural strength of RMGI/RMGI additions was not significantly lower than its cohesive strength. RBC added onto RMGI in the sandwich restorative configuration had lowest failure strength.