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Efecto de los materiales de fabricación y adhesivos de dientes de prótesis en la resistencia de la unión de la base
Thanatat Saengthongpinij1, Pongsakorn Apinsathanon2, Basel Mahardawi3,4
1DDS. Department of Conservative Dentistry and Prosthodontics, Faculty of Dentistry, Srinakharinwirot University, Bangkok, Thailand.
Background:
3D printing enhances denture fabrication, but the bond between printed teeth and bases is often weaker than traditional methods. This study investigates the effect of tooth-adhesive combinations on bond strength to enhance clinical reliability in digital dentistry.
Material And Methods:
Forty-eight cylindrical 3D-printed denture bases were bonded with either 3D-printed (PT) or milled (MT) teeth using three bonding materials: NextDent (ND), Super-Bond (SUP), and Unifast Trad (UNI)(n=8/group). The PT-ND group served as the control. Specimens were subjected to shear bond strength testing using a universal testing machine at 0.5 mm/min, with a 4 mm shear pin, and failure modes were analyzed under a stereomicroscope.
Results:
Tooth type, bonding material, and their interaction significantly influenced bond strength (P<0.05). MT-UNI and MT-SUP demonstrated the highest values (92.33 ± 4.90 N; 87.34 ± 2.41 N), while MT-ND had the lowest (11.72 ± 1.94 N). Among PT groups, PT-SUP performed best (45.59 ± 3.47 N), followed by PT-ND (34.12 ± 3.38 N) and PT-UNI (23.68 ± 4.14 N). High-strength groups exhibited predominantly mixed failure (MT-SUP, MT-UNI, PT-SUP), while lower-strength groups showed adhesive failure. (MT-ND, PT-UNI).
Conclusions:
Bond strength is influenced by both tooth material and bonding agent. From the results, Unifast Trad is optimal for milled teeth; Superbond is best suited for printed teeth. Material selection is critical for improving durability and chairside efficiency in digital prosthodontics.
