Objectives: This study evaluated the failure load of denture teeth to 3 different denture base materials after thermal cycling.

Methods: 360 cylindrical specimens (height 20 mm, diameter 25 mm) of the 3 denture base materials listed in the table below, combined with one acrylic denture tooth type (SR-Antaris, Ivoclar), were divided in six groups with different surface pre-treatments (group A = teeth without pre-treatment, group B = using Al₂O₃ (250 µm), group C = using monomer, group D = using Al₂O₃ (250 µm) + Palabond, group E = using Rocatec, group F = electron beam irradiation). After thermal cycling (6000 x 5°C / 55°C, 2 minutes each cycle, H₂0 dist.) all specimens were loaded using a universal testing machine (Zwick 1446, v=1mm/min, angle 90°) until failure occured. Statistical analysis was performed using the Mann-Whitney U- and Kruskal Wallis-Test (µ = 0.05).

Results:

Failure load median [N]: without TC / with TC	A	B	C	D	E	F
ProBase Cold (Ivoclar-Vivadent)	102.8 / 95.5	241.2 / 183.2	105 / 77.8	213.4 / 184.6	256.6 / 164.9	56.7 / 59.4
SR-Ivocap-Plus (Ivoclar-Vivadent)	149.3 / 188.7	190.4 / 245.9	183.8 / 239.2	319.6 / 229.4	245.7 / 208.9	209.1 / 211.9
Lucitone 199 (Dentsply)	111.2 / 79.5	90.6 / 69.4	175.5 / 127.1	125.4 / 118	261.0 / 207.1	133.5 / 76.3

Conclusions: All specimens showed a mixed adhesive/cohesive failure mode. Electron beam irradiation did not improve the shear bond strength. The significantly highest shear bond strength was found for the denture base material SR Ivocap Plus. Rocatec pre-treatment (E) of acrylic denture teeth showed high results on all tested denture base materials.

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