Retention of three post and core systems with and without etching

Area of Science:

• Restorative Dentistry
• Dental Materials Science

Background:

• Post and core restorations are crucial for rebuilding severely damaged teeth.
• Composite materials offer potential advantages in fabricating posts and cores.
• Assessing the retentive strength and fracture resistance of different post and core systems is vital for clinical success.

Purpose of the Study:

• To compare the retentive strength of all-composite post and core systems with Para Posts and composite cores.
• To evaluate the influence of etched versus unetched post preparations on retentive strength and fracture resistance.

Main Methods:

• Fabrication of post and core specimens using composite material and Para Posts with composite cores.
• Testing specimens under tensile forces to assess retentive strength and identify failure modes.
• Comparison of failure modes, including post debonding and core material fracture.

Main Results:

• Most specimens, regardless of material or preparation type, demonstrated high retention, with only one post debonding.
• Core material fracture at the occlusal surface was the predominant failure mode.
• Para Posts with composite cores cemented into etched preparations exhibited significantly higher fracture resistance compared to all other tested groups.

Conclusions:

• Etched post preparations enhance the fracture resistance of Para Post and composite core restorations.
• Composite materials demonstrate promising retentive strength in post and core applications.
• Para Posts with composite cores in etched preparations represent a robust option for dental restorations.