Comparison of Two GIC's in the Restoration of Posterior Class II Lesions in the Primary Dentition

Inclusion Criteria: * At least 1 and up to 3 primary molars with either International Caries Detection and Assessment System (ICDAS) lesions stage 2-5 or preexisting restorations requiring placement/replacement of Class II restorations * Defects limited to occlusal-proximal surface, with cavity sizes smaller than 3 mm mesio-distally and 3 mm in the occluso-cervical and bucco-lingual directions measured with a World Health Organization (WHO)-graded periodontal probe * Teeth should have both adjoining and their antagonist teeth present. After restoration the restored tooth should enable appropriate proximal contacts on both mesial and distal surfaces after setting of the class II restoration and be in occlusion with the antagonist tooth * Good access * Good general health (ASA I, II) * Good oral hygiene (OHI-S \< 1.9) * Guardians have given informed consent * Child is cooperative and assented Exclusion Criteria: * Known allergy/ sensitivity to GIC or other materials used in this study * Space maintainers or orthodontic appliances * Tooth has a caries lesion or restoration other than those included in the study * Tooth has pathological mobility * Tooth has preexisting developmental defects * Tooth with pulp exposure or indication for endodontic treatment * Pain, fistula or abscess related to the selected tooth * Obvious signs of parafunctional habits (e.g. bruxism) * Participation in another study * Incapable to participate in the recall visits at the university hospital