Ideal transverse position of mandibular first molars based on CBCT-derived alveolar bone coverage.

Background: In orthodontic treatment, transverse arch width often needs to be adjusted to correct anomalies such as posterior crossbite. Ideal transverse arch width at the first molars enabling long-term stability and periodontal health, however, requires sufficient posttreatment bony coverage buccally and orally of the tooth roots. Thus, the aim of this retrospective study was to determine the physiological alveolar bone thickness at the buccal and oral roots of the first mandibular molars in the general population using human CBCT scans assessing local and gender-specific differences.

Effect of tooth brush abrasion and thermo-mechanical loading on direct and indirect veneer restorations.

Objectives: This study investigated toothbrush abrasion and in vitro aging on ceramic (indirect technique) and composite veneers (direct technique).

Materials And Methods: Identical composite and individual human incisors were restored with industrially preformed composite veneers, indirectly produced ceramic veneers, and direct composite restorations. Surface roughness was determined before and after tooth brushing.