IADR Abstract Archives

Liners and Shear Bond Strength After Selective Carious Lesion Removal.

Objectives: To approach deep caries lesions, selective removal of soft carious tissue (SRCT-S) is evidence-based and the most rational procedure for the minimally invasive treatment of the lesions. Whether biocompatible cavity liners are needed when deep caries lesions are treated with SRCT-S remains unclear, nonetheless. Objective: To evaluate the mechanical behavior of composite resins (CR) placed over different cavitary liners after treating deep caries lesions through SRCT-S.
Methods: Materials and methods: 51 human teeth were collected after obtaining ethics approval. 24 decayed and 27 healthy teeth were collected for testing the shear bond strength (SBS). Cross section was made at the maximum depth of the lesion. Each sample was placed in an acrylic resin cylinder and SRCT-S was completed. Sound tooth samples were prepared mirroring carious teeth. Sound (n=9) and carious teeth (n=8) were randomly assigned to one of the 3 experimental groups: Group A: self-etching adhesive (SEA) + CR, Group B: conventional glass ionomer + SEA + CR, and Group C: calcium hydroxide + SEA+ CR. SBS was assessed and strength values were calculated in Newton (N), which were subsequently transformed into Mega Pascals (MPa). Values were compared across subgroups using ANOVA and p values of <0.05 were considered significant.
Results: Results: Statistically significant differences in SBS were found between subgroups (F(5,45)=3.29, p=0.01). The highest mean value was found in Group A without carious lesions (18.34 ± 6.2) and the lowest mean value corresponded to Group C without carious lesions (10.22 ± 2.6). Pairwise comparisons showed that Group A and Group B were statistically significantly different (p <0.05) only compared with Group C.
Conclusions: Conclusion: Teeth restored after SRCT-S using calcium hydroxide as a liner material seem to exhibit lower mechanical resistance than those restored with glass ionomer or SEA alone. Further clinical research to deepen these findings is warranted.

2020 Chilean Division Meeting (Virtual)

2020

Cariology Research-Clinical & Epidemiological Studies
  • Muñoz-sandoval, Cecilia  ( Universidad de Talca , Talca , Maule , Chile )
  • Gambetta-tessini, Karla  ( Universidad de Talca , Talca , Maule , Chile )
  • Giacaman, Rodrigo A.  ( Universidad de Talca , Talca , Maule , Chile )
  • NONE
    Poster Session
    Poster Session A