What is the main reason for using glass ionomer in restorations?

Using glass ionomer in restorations is primarily favored due to its ability to adhere to tooth structure and its role in reducing recurrent caries. This type of restorative material has a unique property of chemically bonding to enamel and dentin, which contributes to a more secure and long-lasting restoration compared to materials that rely solely on mechanical retention.

Moreover, glass ionomer releases fluoride, which helps to inhibit the growth of harmful bacteria and can lead to a decrease in the occurrence of secondary caries around restorations. This is particularly advantageous in areas susceptible to caries, as it enhances the longevity and health of the tooth.

While it may also have benefits like lower costs or ease of polishing, those attributes do not address the primary function and effectiveness of the material in preventing dental decay and promoting tooth health. Similarly, aesthetic considerations, while important in certain contexts, do not overshadow the significant advantage of caries prevention and adhesion to tooth structure that glass ionomer provides.