Objectives The aim was to evaluate fracture behaviour of directly restored pulpotomized primary molars with two biomimetic and one bilayered structures. Besides, impact of these structures to restore strength of sound molars was evaluated
Materials and Methods Sixty extracted second primary molars with certain inclusion criteria were mounted in epoxy resin. Fifteen sound molars were left intact without any preparation as Group A (Intact structure). Other forty-five carious molars received standardized access cavity preparation and pulpotomy procedures and then randomly distributed in three equal groups (n= 15) based on composite restoration bilayered structure: Group B (everX Posterior + G -aenial Posterior), Group C (everX flow + G -aenial Posterior), and Group D (Filtek Bulk Fill Flow + Filtek Z250 XT). Each composite resin and its adhesive were applied with strict adherence to manufacture instructions. All molars were tested for fracture resistance and fracture patterns were examined. Statistical analysis was done using ANOVA and post-hoc tests at 5% of significance.
Results Although fracture resistance difference between biomimetic structures (groups B and C) and bilayered structure (group D) was non-significant (p>0.05), but significantly lower than intact structure (group A) (p<0.05). Majority of fracture pattern in intact group was type I, while majority in biomimetic groups and bilayered group was types II and III respectively.
Conclusions: Biomimetic restoration showed most favorable outcomes for pulpotomized molars regarding strength and fracture pattern.
Clinical relevance: Biomimetic restoration utilizing short glass-FRC could be recommended as conservative and time saving restoration for pulpotomized primary molars.