The Influence of Chlorhexidine Gluconate Dentine Pre-Treatment on Adhesive Interface and Marginal Sealing

Abstract

Background and Objectives: The aim of this in vitro study was to evaluate the combined effect of a 2% chlorhexidine aqueous solution and a universal adhesive system applied in self-etch and etch-and-rinse strategies on the composite resin–dentin interface. Materials and Methods: Class V cavities were prepared on the facial and lingual surfaces of forty caries-free molars extracted for orthodontic reasons. The samples were randomly divided into two groups corresponding to the used etching protocol: I—etch-and-rinse; II—self-etch. In each tooth, one cavity was assigned for the control subgroups -IA (n = 20) and IIA (n = 20)—adhesive only, and the opposite cavity was pretreated with a 2% chlorhexidine solution—Gluco CHeX Cerkamed—subgroups IB (n = 20) and IIB (n = 20). Both sets of groups were restored using a universal adhesive system (Single Bond Universal Adhesive, 3M-ESPE) and a bulk-fill composite resin (Filtek One Bulk Fill Restorative, 3M-ESPE). The roots and the pulp tissue were then removed, and a needle connected to a perfusor with 100 mL saline solution was used for pulp pressure simulation with a hydrostatic pressure of 20 cm H2O. Cariogenic attack was simulated using a demineralizing solution for 3 days at a constant temperature of 25 °C. The teeth were then sectioned in a facial-lingual direction and the microleakages at the occlusal and cervical margins were registered and scored using an optical Carl-Zeiss AXIO Imager A1m microscope (Carl-Zeiss). The composite resin–dentin interface was analyzed using a SEM Vega Tescan LMH II. Statistical analysis was performed using the Kruskal–Wallis test with a significance level of p < 0.05. Results: Microleakage evaluation showed no significant differences among the study groups (p > 0.05). In subgroup IA, significant differences were recorded between occlusal and cervical margins (p < 0.05). Conclusions: Application of chlorhexidine on tooth substrate before using a universal bonding system in total etch or self-etch mode has no influence on the adhesive interface in the condition of cariogenic attack. The thickness of the adhesive resin layer seems to be less uniform when using chlorhexidine, but the morphological differences at the adhesive interface have no influence on the sealing capacity of the universal bonding system, regardless of the etching strategy.

Evaluation of microleakage scores of flowable bulk-fill and flowable conventional composites according to different adhesive application modes

“…39 Boaru ve ark. 'nın 40 Sınıf V kavitelerde universal adeziv sistem uygulaması sonrası yüksek vizköziteli bulk fill kompozit rezinlerin mikrosızıntısını inceledikleri çalışmalarında, selfetch uygulaması sonrası, okluzal ve servikal kenarlar arasında anlamlı bir fark tespit etmemişlerdir. 40 Çalışmamızın limitasyonlarından biri örneklere mekanik yaşlandırma uygulanmaması, yalnızca termal döngü uygulanarak yaşlandırılması yapılmasıdır.…”

“…'nın 40 Sınıf V kavitelerde universal adeziv sistem uygulaması sonrası yüksek vizköziteli bulk fill kompozit rezinlerin mikrosızıntısını inceledikleri çalışmalarında, selfetch uygulaması sonrası, okluzal ve servikal kenarlar arasında anlamlı bir fark tespit etmemişlerdir. 40 Çalışmamızın limitasyonlarından biri örneklere mekanik yaşlandırma uygulanmaması, yalnızca termal döngü uygulanarak yaşlandırılması yapılmasıdır. Ayrıca, ileri araştırmalarda mikrosızıntının değerlendirilmesi için farklı yöntemler birarada kullanılarak, yöntemler arası elde edilen verilerin kıyaslaması yapılır, böylece verilerin güvenirliliğinin değerlendirilmesine imkan tanınır.…”