INTRODUCTION To understand orthodontic tooth movement, a method of quantification of tooth position discrepancies in 3 dimensions is needed. Brackets and wires now can be fabricated by CAD/CAM technology on a setup made at the beginning of treatment, so that treatment should produce a reasonably precise duplicate of the setup. The extent of discrepancies between the planned and actual tooth mov...

Introduction: In orthodontic diagnosis and treatment planning it is an important goal to reach the best functional and esthetic results. However, during treatment planning the size of the teeth is a frequently ignored factor. The discrepancies of the mesiodistal widths of the teeth can be examined with the Bolton analysis. Our aim is to investigate whether the results described by Bolton are ap...

Question: Do the biomechanical properties of the diet influence the tooth shape of insectivores? We examined dietary ‘intractability’, the extent to which structural strength, toughness and stiffness of a food are increased, roughly equivalent to ‘hardness’. Hypotheses: The following three factors may cause discrepancies in tooth form in animals with different diets: (1) optional functional for...

introduction: marginal adaptation of cast restorations is essential for their long-term success. as dentists usually assign ditching of dies to laboratory technicians, and ditching has a significant effect on marginal adaptation, the aim of this study was to compare ditching by laboratory technicians and standard approach on marginal adaptation of cast restoration. materials and methods: in thi...

PURPOSE The aim of this study was to evaluate the repeatability of the digitizing of silicon rubber impressions of abutment teeth by using a white light scanner and compare differences in repeatability between different abutment teeth types. MATERIALS AND METHODS Silicon rubber impressions of a canine, premolar, and molar tooth were each digitized 8 times using a white light scanner, and 3D s...

Achieving metallic frameworks of single tooth restorations involves obtaining high precision parts. Adaptation accuracy is one of the main factors that influence single tooth restorations long-term reliability. The purpose of the study was to test innovative methods for adaptation accuracy evaluation of different single tooth cast restorations. Acrylic teeth were prepared for single tooth cast ...

PURPOSE The accuracy of a gypsum model (GM), which was taken using a conventional silicone impression technique, was compared with that of a polyurethane model (PM), which was taken using an iTero™ digital impression system. MATERIALS AND METHODS The maxillary first molar artificial tooth was selected as the reference tooth. The GMs were fabricated through a silicone impression of a reference...