Retention of a core material supported by three post head designs

Area of Science:

• Dental Materials Science
• Biomaterials Engineering
• Prosthodontics

Background:

• Limited research exists on the retention of core build-up materials with various prefabricated post head designs.
• Investigating novel ceramic post designs is crucial for understanding their clinical performance.

Purpose of the Study:

• To compare the retention of two core build-up materials (Ti-Core composite and Miracle Mix glass ionomer) with three prefabricated post head designs (Flexi-Post, AccessPost, Cerapost).
• To evaluate the influence of post head design and core material on the retentive strength of dental posts.

Main Methods:

• An in vitro study utilizing a 3x2 factorial design with six groups (10 specimens each).
• Retention testing was performed using an 810 MTS testing machine on unloaded specimens.
• Statistical significance was determined using ANOVA, with P < .05 considered significant.

Main Results:

• Significant differences in retention were observed between post designs and core materials (P < .0001).
• Stainless steel posts (AccessPost, Flexi-Post) demonstrated higher retention than the ceramic Cerapost.
• Ti-Core composite material exhibited greater retentive strength than Miracle Mix glass ionomer.

Conclusions:

• The retentive strength of prefabricated posts is significantly influenced by both post head design and core material.
• Stainless steel posts with composite core materials offer superior retention for dental restorations.
• Ceramic post head designs may present lower retentive values compared to metallic designs.