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The aim of this study was to investigate the shear bond strength of composite resin to PEEK under hypobaric and hyperbaric pressure changes in different PEEK surface treatments. Ninety-six PEEK specimens were divided into three groups ( n  = 32). PEEK surfaces were sandblasted; acid-etched, and non-treated. Every group was then divided into three sub-groups ( n  = 10) for simulating hyperbaric pressure (2.8 atm-18 m under sea level), hypobaric pressure (0.34 atm-8,200 m high altitude), and the control group (atmospheric pressure). The specimens underwent pressure cycles for 20 days. Results were compared by using ANOVA followed by the  post-hoc  Tukey test. Variations in bond strength within each group were also evaluated by the Weibull modulus. Regardless of the environmental pressure changes, it was determined that the bonding strength and the Weibull modulus were the highest in the acid-etched PEEK. Bonding strengths were lower in all groups after exposure to environmental pressure changes, but this difference was not statistically different. Bond strengths between the PEEK material and composite resin can be affected by environmental pressure, while surface modification of the PEEK material plays an important role in bond strength. Dentists should take importance in choosing the appropriate material on patients who are exposed to different barometric changes, as fractures on restorations may be life-threatening.

Evaluation of bond strength of polyether ether ketone (PEEK) to composite resin on hypobaric and hyperbaric conditions