An in vitro study on the retentive strength of orthodontic bands cemented with CPP-ACP-containing GIC

作者：Heravi Farzin; Bagheri Hossein; Rangrazi Abdolrasoul^*; Zebarjad Seyed Mojtaba

来源：Materials Research Express, 2016, 3(12): 125401.

DOI：10.1088/2053-1591/3/12/125401

• glass ionomer
• CPP-ACP
• retentive strength
• ARI score
• orthodontic band

Caries and white spot lesions around orthodontic bands are well known occurrences in fixed orthodontic treatment. There are several methods to overcome these problems. One of these includes modification of the band cement with remineralizing agents such as casein phosphopeptide-amorphous calcium phosphate (CPP-ACP). However, it should be evaluated that the cement modification has no significant negative effects on the retentive strength of the cemented orthodontic bands. In a continuation of our previous studies on the effects of the addition of CPP-ACP on the mechanical properties of luting and lining glass ionomer cement (GIC), this study aimed to investigate the retentive strength of orthodontic bands cemented with CPP-ACP containing GIC. Sixty extracted human pre molars teeth were embedded in acrylic resin and randomly divided into two groups of 30 specimens. In group 1, bands were cemented to the tooth with a GIC. In group 2, CPP-ACP (1.56% w/w) was added to the GIC before cementation. The retentive strength of each groups was determined with a universal testing machine. Further, the amount of cement remaining on the tooth surface was evaluated under a stereomicroscope, and the adhesive remnant index (ARI) score was determined. Results of this study showed that there were no significant differences between the groups in retentive strength and ARI score. In conclusion, modification of GIC with 1.56% w/wCPP-ACP had no negative effects on the retentive strength of the bands so can be used during fixed orthodontic treatment.

• 出版日期2016-12