Department;
of;
Orthodontics,;
School;
of;
Stomatology,;
Jilin;
University,;
Changchun,;
China;
Department;
of;
Prosthodontics,;
School;
of;
Stomatology,;
Jilin;
University,;
Changchun,;
China;
Department;
of;
Oral;
Pathology,;
School;
of;
Stomatology,;
Jilin;
University,;
Changchun,;
China;