Objectives: The aim of the current study is to establish the reliability of linear cephalometric measurements made on mandibles and their respective 3D printed models created from different voxel resolutions from a cone beam CT machine. Materials and methods: Ten dry mandibles obtained from the Department of Oral Pathology, Radiology and Medicine at The University of Iowa College Of Dentistry were used for this study. All mandibles were scanned on the i-CAT FLX cone beam CT machine (Imaging Sciences International, LLC, Pennsylvania, USA) using voxel resolutions of .30mm, .25mm and .20 mm in a 16cm x 8cm field of view using 360° rotation. The 3D models were reconstructed and saved as .STL files using 3D Slicer software and send to a 3D printer for printing. Two observers measured the 10 mandibles and 30 3D printed models. The measurement were repeated on 50% of the samples after at least one week interval. Cronbach’s alpha and intraclass correlation coefficient were calculated to measure reliability. Results: Good to excellent interobserver and intraobserver reliability was achieved across most of the measurements. There was no difference in reliability across models made from different voxel sizes. Conclusion: The current study successfully showed that the reliability of measurements made on 3D printed models of dry skull mandibles created using fused deposition modeling technique using images of different voxel sizes from an i-CAT FLX CBCT machine are valid, reproducible, and reliable and can be used for diagnostic and clinical purposes.

Objetivo: El objetivo de este estudio fue evaluar la correlación entre el patrón esquelético y el patrón facial en radiografías cefalométricas en pacientes con deformidad dentofacial clase I y III. Materiales y métodos: El presente estudio fue de tipo transversal. La muestra estuvo constituida por 160 radiografías cefalométricas digitales (40 por cada género y clase). El análisis se realizó con la ubicación de los puntos cefalométricos con el programa VixWinPlatinium® según el análisis de Steiner para tejidos duros y Burstone - Legan para tejidos blandos. El análisis de datos se realizó mediante estadística descriptiva (media ±de) y la correlación de ambos análisis mediante Correlación de Pearson. Resultados: Los resultados indicaron que no existe correlación entre el patrón esquelético y facial en pacientes con deformidad dentofacial clase I. En hombres 0.15 (p= 0,353) y mujeres -0.12 (p= 0,433). Por otro lado, en pacientes con deformidad dentofacial clase III, sí se obtuvo correlación con 0.41 en mujeres (p= 0,08) y en hombres 0.32 (p=0,008). Conclusiones: Basado en los datos mencionados se puede determinar que el sexo no es un factor determinante para hallar el diagnóstico y tratamiento de pacientes con deformidades dentofaciales clase I y III. / Objective: The objective of this study was to evaluate the correlation between the skeletal pattern and the facial pattern in cephalometric radiographs in patients with dentofacial deformities class I and III. Materials and methods: The following was a cross-sectional or transverse study. The sample consisted of 160 digital cephalometric radiographs (40 for each gender and class). The analysis was performed by identifying locations of cephalometric points using the VixWinPlatinium ® program, then hard tissues were further evaluated according to the Steiner analysis and Burstone-Legan for soft tissues. The data analysis was performed by means of descriptive statistics (mean ± of) and the correlation of both analysis by means of Pearson correlation. Results: The results indicated that there is no correlation between the skeletal and facial pattern in patients with dentofacial deformity class I. In men 0.15 (p = 0.353) and women -0.12 (p = 0.433). On the other hand, in patients with dentofacial deformity class III, correlation was obtained with 0.41 in women (p = 0.08) and in men 0.32 (p = 0.008). Conclusions: Based on the aforementioned data, it can be determined that sex is not a determining factor to find the diagnosis and treatment of patients with dentofacial deformities class I and III. / Tesis

Thesis--University of Oklahoma. / Includes bibliographical references (leaves 64-65).

Thesis--University of Oklahoma. / Bibliography: leaves 97-101.

Bibliography: leaves 187-211. / 288 leaves : col. ill. ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / An observational retrospective study to determine if any difference exists in the soft tissue profile of Class II division 1 patients before and after treatment with three different functional appliances; the activator with headgear, the Clark Twin Block, and the Frankel. / Thesis (M.D.S.)--University of Adelaide, Dept. of Dentistry, 1999

Bibliography: leaves 187-211. / 288 leaves : col. ill. ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / An observational retrospective study to determine if any difference exists in the soft tissue profile of Class II division 1 patients before and after treatment with three different functional appliances; the activator with headgear, the Clark Twin Block, and the Frankel. / Thesis (M.D.S.)--University of Adelaide, Dept. of Dentistry, 1999

Thesis (D.M.) -- University of Adelaide, Dept. of Dental Science, 1962. / Typewritten. Includes bibliographical references.

Thesis (M.S.)--University of Michigan, 1983.

Thesis (M.S.)--University of Southern California, 1999. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Doktoravhandling--Copenhagen. / Bibliography: p. 97-[100].