Multichannel computed tomography versus cone-beam computed tomography: linear accuracy of in vitro measurements of the maxilla for implant placement.

Purpose: Accurate measurement of alveolar bone and adjacent anatomic structures is of paramount importance in implant insertion. This study was conducted to compare the linear measurement accuracy of 64-channel computed tomography (CT) and cone-beam CT (CBCT).

Materials And Methods: Twenty-seven sites were marked on three dry human skulls, with the positions of the buccal and palatal fiducial markers ensuring the representation of one plane by each buccal-palatal pair.

Assessment of the golden ratio in pleasing smiles.

Aims: The golden ratio is a guideline to help harmoniously restore or replace missing teeth. However, this concept is controversial. This study assesses the validity of the golden ratio between the widths of the maxillary anterior teeth in individuals presenting with an attractive/nonattractive smile.