Modified composite or conventional glass ionomer for band cementation? A comparative clinical trial

Evaluation of mechanical properties of five cements for orthodontic band cementation

“…1 Band retention is mechanically influenced by the manner in which bands are adapted on teeth, and by the properties of the cements used. [2][3][4] Today, the cements most widely used to cement molar bands are conventional glass ionomers (CGI), which have significant advantages, such as constant fluoride release and uptake, microbial inhibition, chemical adhesion to teeth and to metal, [5][6][7][8][9][10] low thermal coefficient of expansion 6 and low solubility. 11 The introduction of light polymerized systems enhanced initial CGI resistance.…”

“…25 Modified resins such as BL have very little acidbase reaction and are less likely to ionically bond to enamel, compared to CGI. Gillgrass et al 10 found no clinical failure differences between BL and KC; however, BL failed mainly at enamel/cement interfaces, and KC failed mainly at cement/band interfaces. Gillgrass et al 10 did not find any differences in white spot lesions between BL and KC.…”

“…Gillgrass et al 10 found no clinical failure differences between BL and KC; however, BL failed mainly at enamel/cement interfaces, and KC failed mainly at cement/band interfaces. Gillgrass et al 10 did not find any differences in white spot lesions between BL and KC.…”

“…10 In order to over-come this issue, sandblasting the band with aluminum oxide is recommended to increase the adhesion force. 25 Modified resins such as BL have very little acidbase reaction and are less likely to ionically bond to enamel, compared to CGI.…”

“…For example, polyacid-modified composites could fail without cement breakage, due to their low adhesion to enamel. 10 This kind of failure is uncommon with CGIs or RMGICs because of their high adhesion to metal and enamel; however, failures may be observed upon cement cohesion breakage. The mechanical adaptation of a band to the tooth structure is as important as the selection of materials, since the band will help support the occlusional forces, and will no longer have to rely solely on the mechanical properties of the cements used.…”