An in vitro comparison of adhesive techniques and rotary instrumentation on shear bond strength of nanocomposite with simulated pulpal pressure

Abstract

Aim:The aim of this study is to evaluate the shear bond strength of composite to tooth using different adhesive techniques and rotary instruments under simulated pulpal pressure.Materials and Methods:Sixty extracted human molars were randomly divided into two groups of 30 samples each (group I and II), according to the adhesive technique followed (i.e. total etch and self etch groups). Each group was further divided into two sub-groups (Sub-groups A and B) of 15 samples each according to the cutting instrument (diamond abrasive or carbide burs) used. Class II cavities were made with diamond abrasive or carbide burs, and restored with nano-composite under positive intra-pulpal pressure. Shear bond strength of the specimens were recorded simultaneously.Results:After statistical evaluation using two-way ANOVA and t-test, the mean shear bond strength values of the groups are as follows: Group IA- 4.69 MPa, Group IB-6.15 MPa, Group IIA-4.3 MPa, and Group IIB-6.24 MPa. It was seen that group IIB showed highest bond strength followed by group IB. Group II A showed the least bond strength.Conclusions:Within the limitations of the study, diamond abrasive gave better bond strength than carbide bur with both the adhesive techniques.

Marginal sealing ability of silorane and methacrylate resin composites in class II cavities: A scanning electron microscopic study

“…No significant problems are experienced in placing and curing composite material when using a metal matrix as long as small incremental additions are used. [ 12 ]…”

“…[ 10 13 ] C factor for dental restorations typically ranges from 0.1 to 5, with higher values indicating a greater likelihood of high interfacial stress. [ 12 ] C factor in class II restorations is 2, and the restorations are susceptible to adhesive breakdown during curing. Oblique incremental technique with increment of 1-1.5 mm thickness produce lowest C factor.…”

Durabilidad de las fresas de diamante tras realizar desgastes en dientes naturales, comparando 4 marcas comerciales, analizado en microscopía electrónica / Durability of Four Diamond Bur Brands after Tooth Preparation. Electronic Microscopy Analysis

“…Si los instrumentos no realizan el corte y la remoción adecuada del barrillo dentinal, la mayor densidad dicultará su disolución por medio del ácido y, por tanto, menor área de contacto entre el adhesivo y el material restaurador. En este estudio se encontraron algunas diferencias signicativas en el estado nal de las 4 marcas evaluadas, tal y como se observa en los resultados (14).…”

“…La forma y adhesión de los granos de diamante en los vástagos son los factores responsables de la eciencia de corte del instrumento (18): serán determinantes en la calidad de la preparación. Las fresas de diamante, al ser comparadas con otros elementos de corte (19), han resultado tener mejor fuerza adhesiva (14) y resistencia a la tensión de la interfaz de la supercie del diente y el material restaurativo. Lo anterior es importante en la práctica clínica, ya que el estado del instrumento no estará relacionado solamente con la vitalidad del diente, sino con la humectación y óptimo sustrato para procesos de rehabilitación adhesiva.…”

Evaluation of shear bond strength of various adhesives under Simulated intrapulpal pressure: An in vitro study

“…This small flow opposes the monomer resin's diffusion toward the pulp, affecting the bonding of the composite resin restoration. [ 8 9 10 ] Currently, several universal adhesives in the market are said to have achieved acceptable levels of bond strength.…”