The capsule was attached to the mixer and mixed for 10 seconds. The cement was evenly distributed to the crowns paying attention that there were no air voids. Then crowns were placed by pressing them onto the prepared teeth with finger pressure. At least 2 minutes and 15 seconds after mixing, the excess cement was cleaned off. Following mixing, a minimum of 4 minutes and 30 seconds was allowed for the cement to set.

FujiCEM 2 (GC, Tokyo, Japan) was evenly distributed to the inner surface of the crown with the syringe and immediately placed onto the teeth with finger pressure. The crowns were placed on the prepared tooth. At least 2 minutes and 15 seconds after mixing, the excess cement was cleaned off. Following mixing, a minimum of 4 minutes and 30 seconds was allowed for the cement to set.

After the caries were removed, the teeth were prepared according to the manufacturer's recommendations for Figaro Crowns. Fiberglass crowns (Figaro Crowns Inc., USA) of the most suitable size in terms of the mesio-distal dimension of the tooth were selected. Following the establishment of anesthesia, the teeth were prepared using diamond cutting burs with a high-speed, water-cooled turbine handpiece. In order to achieve adequate interocclusal space, an occlusal reduction of 1-2 mm was executed along with a proximal reduction reaching 1 mm below the gingival margin. A more conservative reduction was applied to the buccal and lingual surfaces. After preparation, any remaining decayed dentin tissue was removed using a steel round bur with a low-speed micromotor. To ensure occlusal harmony, diamond burs were used to perform abrasion on the crown edges, and the trimmed crown edges were polished using rubber aids before cementation.

Crown success was categorized as "successful" if no loss or fractures occurred and "unsuccessful" otherwise. Failed cases are classified as decementation, occlusal wear and fracture. Fracture classification includes large loss and chipped cases.

The Plaque Index scores of all teeth, including those treated with crowns (FGC group) and their symmetrical, healthy counterparts (control group), were evaluated and recorded, both before and after the application of the fiberglass crowns. The plaque Index was evaluated using the criteria established by Silness and Löe, with scores assigned as follows; 0 (the best): no plaque, 1: a film of plaque adhering to the free gingival margin and adjacent area of the tooth, 2: moderate accumulation of soft deposits within the gingival pocket, or the tooth and gingival margin which can be seen with the naked eye and, 4 (the worst): abundance of soft matter within the gingival pocket and/or on the tooth and gingival margin. In the evaluation of the periodontal index, plaque control was carried out by utilizing a plaque-disclosing agent.

Parental satisfaction was assessed for appearance, color, shape, size, and durability according to Roberts et al.'s criteria. A 1-5 scale was used with 1=very dissatisfied and 5=very satisfied.