Porcelain to dentin bond strength with a dentin adhesive

Area of Science:

• Dental Materials Science
• Biomaterials Engineering
• Adhesive Dentistry

Background:

• Porcelain adhesion to dentin is crucial for restorations when enamel is limited.
• Assessing dentin bond strength is vital for long-term dental prosthetic success.

Purpose of the Study:

• To evaluate the bond strength of porcelain to dentin using a specific dentin adhesive (All-Bond).
• To compare the porcelain-dentin bond strength with porcelain-enamel bond strength.

Main Methods:

• Sixty human molar teeth were prepared with either dentin or enamel bonding sites.
• Porcelain cylinders were bonded to enamel (n=20), dentin at 48 hours (n=20), and dentin after thermocycling (n=20).
• Bond strength was measured using an Instron universal testing machine at a crosshead speed of 0.5 mm/minute.

Main Results:

• Mean bond strengths were: enamel (19.0 ± 2.9 MPa), dentin at 48 hours (14.4 ± 5.4 MPa), and dentin after thermocycling (10.1 ± 3.8 MPa).
• Statistical analysis (ANOVA and Scheffe's test) revealed significant differences between groups.
• Porcelain-dentin bonds at 48 hours were stronger than those after thermocycling; enamel bonds were significantly stronger than both dentin bond groups.

Conclusions:

• The dentin adhesive demonstrated measurable porcelain-dentin bond strength.
• Porcelain-enamel bonds exhibit superior strength compared to porcelain-dentin bonds.
• Thermocycling significantly reduces porcelain-dentin bond strength, highlighting the need for durable adhesive systems in clinical applications.