The effect of different liners on the bond strength of a compomer to primary teeth dentine: in vitro study

Auszug

Protective liners have been applied to deep dentine following caries removal for many decades in order to protect pulp tissue and allow for tertiary dentine formation via active vital odontoblasts (Marchi et al. 2006). These materials are designed to cover and plug open dentinal tubules and to form a tight scaffold between restorative material and pulp (Falster et al. 2002). However, up to now it is not fully proven whether this is really induced by the presence of liners or bases (Marchi et al. 2006; Fuks 2008). There are multiple in vitro studies in the literature which show that a. thin residual dentine areas may allow for monomer diffusion through dentinal tubules (Schmalz et al. 2001), and b. that the critical remaining dentine thickness is double when it comes to primary dentine due to larger tubule diameters and less mineralization overall (Fuks 2008). For this reason, millions of protective liners are still applied on deep dentine areas in permanent as well as primary teeth. However, there is limited information whether these materials reduce dentine bonding behavior of adhesively bonded materials to dentine of primary teeth. Protective liners can be an adhesive alone (Falster et al. 2002), resin modified glass ionomer cement (Itota et al. 2006), calcium hydroxide (Al-Zayer et al. 2003), zinc oxide eugenol (Pinto et al. 2006), or glass ionomer cement (Marchi et al. 2006). …