Direct composite restorations are accepted as a treatment option for microdontia, which is a relatively prevalent condition that poses esthetic concerns. While free-hand composite placement is technique-sensitive and time-consuming, the resin composite injection technique is more straightforward and predictable. A fully digital workflow has been recently introduced, but the 3D-printed resin index is rigid and challenged by undercuts, as opposed to the silicone index. This case report presents a flexible 3D-printed resin index, which can accurately transfer the digitally simulated functional and esthetic form to the final restoration. In addition, a rigid stabilization holder was designed to stabilize the flexible index.

*Keiichi Hosaka DDS PhD Department of Regenerataive Dental Medicine Tokushima University Graduate School of Biomedical Sciences and Institute of Post LED Photonics Tokushima University Tokushima Japan

Antonin Tichy DDS PhD Institute of Dental Medicine 1st Faculty of Medicine of the Charles University and General University Hospital Prague Prague Czech Republic

Eiji Tanaka DDS PhD Department of Orthodontics and Dentofacial Orthopedics Tokushima University Graduate School of Biomedical Sciences Tokushima Japan

Kazuhide Yonekura DDS PhD Department of Regenerative Dental Medicine Tokushima University Graduate School of Biomedical Sciences and Institute of Post LED Photonics Tokushima University Tokushima Japan

Keiichiro Watanabe DDS PhD Department of Orthodontics and Dentofacial Orthopedics Tokushima University Graduate School of Biomedical Sciences Tokushima Japan

Kohei Kamoi RDT Department of Dental Laboratory Tokushima University Hospital Tokushima Japan

Masahiro Hiasa DDS PhD Department of Orthodontics and Dentofacial Orthopedics Tokushima University Graduate School of Biomedical Sciences Tokushima Japan

Masatoshi Nakajima DDS PhD Department of Regenerative Dental Medicine Tokushima University Graduate School of Biomedical Sciences Tokushima Japan

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