Effects of different expansion appliances and surgical incisions on maxillary expansion: A finite element analysis.

Purpose: This study aims to assess the impact of different surgical techniques and three expansion appliances on maxillary expansion in adults using finite element analysis (FEA), with a focus on maxillary displacement and stress on surrounding structures.

Methods: Seven different FEA models were created to compare different surgical techniques and three different expansion appliances. Model I represented a bone-supported appliance without surgical assistance.

Color changes of nanocomposites used for clear aligner attachments: an in vitro study.

Purpose: The purpose of this study was to compare the color changes of two different nanocomposites used for two different designs of clear aligner attachments.

Methods: In all, 120 human premolars were embedded in 12 upper dental models with 10 premolars in each model. Models were scanned and attachments were digitally designed.