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Dentist tooth 3d

Conrad Winkelmeyer, Stefan Wolfart, Juliana Marotti
STATEMENT OF PROBLEM: Under clinical circumstances, it can be challenging for a dentist to achieve an adequate tooth preparation, which is essential for the long-term success of fixed dental restorations. This is particularly true for zirconia restorations fabricated by computer-aided design and computer-aided manufacturing (CAD/CAM) because of the difficulties involved in the scanning and milling process. PURPOSE: The purpose of this retrospective study was to use a digital approach to evaluate dental tooth preparations for zirconia-based crowns and fixed dental prostheses (FDP) performed by general dental practitioners in Germany and to find out whether the type of prepared tooth or the type of restoration influenced the outcome...
May 26, 2016: Journal of Prosthetic Dentistry
Mohammad Naebi, Eshaghali Saberi, Sirous Risbaf Fakour, Ahmad Naebi, Somayeh Hosseini Tabatabaei, Somayeh Ansari Moghadam, Elham Bozorgmehr, Nasim Davtalab Behnam, Hamidreza Azimi
Background/Purpose. In terms of the detection of tooth diagnosis, no intelligent detection has been done up till now. Dentists just look at images and then they can detect the diagnosis position in tooth based on their experiences. Using new technologies, scientists will implement detection and repair of tooth diagnosis intelligently. In this paper, we have introduced one intelligent method for detection using particle swarm optimization (PSO) and our mathematical formulation. This method was applied to 2D special images...
2016: International Journal of Dentistry
Parinaz Mortaheb, Mehdi Rezaeian
Segmentation and three-dimensional (3D) visualization of teeth in dental computerized tomography (CT) images are of dentists' requirements for both abnormalities diagnosis and the treatments such as dental implant and orthodontic planning. On the other hand, dental CT image segmentation is a difficult process because of the specific characteristics of the tooth's structure. This paper presents a method for automatic segmentation of dental CT images. We present a multi-step method, which starts with a preprocessing phase to reduce the metal artifact using the least square support vector machine...
January 2016: Journal of Medical Signals and Sensors
Pit Voss, Ute Ludwig, Philipp Poxleitner, Veronika Bergmaier, Nora El-Shafi, Dominik von Elverfeldt, Vincent Stadelmann, Jan-Bernd Hövener, Tabea Flügge
OBJECTIVES: Bisphosphonate-associated osteonecrosis of the jaw (BP-ONJ) is a side effect of antiresorptive treatment that is increasingly prescribed for patients with osteoporosis or malignant diseases with bone metastases. Surgical treatment of BP-ONJ requires adequate pre-operative imaging. To date, CT is the imaging standard in clinical routine; however, defining the extent of the pathological area is difficult and soft tissues are poorly displayed. MRI with zero echo time (ZTE-MRI) to display hard tissues enables a precise display of calcified structures and soft tissues for the delineation of bone necrosis and soft-tissue reactions...
2016: Dento Maxillo Facial Radiology
J C Dubois, M Bessadet, E Nicolas
BACKGROUND: During its clinical practice, the dentist is often faced with issues concerning the determination of teeth shade. This step is considered sensitive by numerous clinicians and dental laboratories. The objective of this study was to test the ability of professional dentists to visually determine the teeth color. MATERIAL AND METHODS: Eleven dentists classified 35 unmarked samples according to their hue, chroma and value from 2 standardized tooth shade guides Ivoclar-Vivadent (Chromascop) et Vita (3D Master)...
September 2014: Odonto-stomatologie Tropicale, Tropical Dental Journal
Marcelo Mendes Pinto, Camila Haddad Leal de Godoy, Carolina Carvalho Bortoletto, Silvia Regina Garcia Olivan, Lara Jansiski Motta, Olga Maria Altavista, Katia Lumi, Ana Paula Taboada Sobral, Sandra Kalil Bussadori
BACKGROUND: Technological innovations in dental materials have been fueled by the desire of patients to improve the esthetics of their teeth. This emphasis on esthetics has led dentists to seek resources that respect the standards established by society, but without compromising the integrity of the teeth. METHODS/DESIGN: The aim of the proposed controlled clinical trial will be to assess colorimetric changes and increased dental sensitivity in adolescent patients submitted to tooth whitening with 6% and 7...
2014: Trials
Cooper M Logan, Katrina U Co, William A Fried, Jacob C Simon, Michal Staninec, Daniel Fried And, Cynthia L Darling
One major advantage of composite restoration materials is that they can be color matched to the tooth. However, this presents a challenge when composites fail and they need to be replaced. Dentists typically spend more time repairing and replacing composites than placing new restorations. Previous studies have shown that near-infrared imaging can be used to distinguish between sound enamel and decay due to the differences in light scattering. The purpose of this study was to use a similar approach and exploit differences in light scattering to attain high contrast between composite and tooth structure...
February 20, 2014: Proceedings—Society of Photo-Optical Instrumentation Engineers
S R Kwon, M Meharry, U Oyoyo, Y Li
AIM: To evaluate the efficacy of do-it-yourself (DIY) whitening as compared to conventional tooth whitening modalities using different shade assessment tools. METHODS AND MATERIALS: Extracted human molars (120) were randomly distributed to six groups (n=20). Whitening was performed according to manufacturer's directions for over-the-counter, dentist-dispensed for home use, and in-office whitening. DIY whitening consisted of a strawberry and baking soda mix. Additionally, negative and positive controls were used...
January 2015: Operative Dentistry
Gulden Sinmazisik, Goksu Trakyali, Bilge Tarcin
STATEMENT OF PROBLEM: The ability of dental technician students to match tooth shade with the Vita 3D-Master shade guide and Toothguide Training Box has not been investigated. PURPOSE: The purpose of this study was to evaluate and compare the shade-matching ability of dental technician students and graduate dentists using the Vita 3D-Master shade guide. MATERIAL AND METHODS: Twenty-nine dental technician students (DTS group) and 30 graduate dentists (GD group) participated in this study...
December 2014: Journal of Prosthetic Dentistry
Andreas Zenthöfer, Stefan Wiesberg, Achim Hildenbrandt, Gerhard Reinelt, Peter Rammelsberg, Alexander J Hassel
PURPOSE: Although the VITA 3D-Master (3D) shade guide offers improved shade-matching performance, many dental materials are only available in VITA Classical (VC) shades. This study aimed to clarify whether it is possible to convert 3D shades determined by observers into VC shades (indirect method) without adding a clinically significant error in comparison with direct shade determination using the VC shade guide. MATERIALS AND METHODS: Forty ceramic specimens were fabricated...
July 2014: International Journal of Prosthodontics
Luiz Renato Paranhos, Miller Zaroni, João Paulo de Carli, Roberta Okamoto, Lucas Villaça Zogheib, Fernando César Torres
AIM: The purpose of this study was to verify the association between the facial type and the morphology of the upper central incisor, to potentially provide a guide for artificial tooth selection in esthetic and prosthetic rehabilitation. MATERIALS AND METHODS: The sample consisted of 51 lateral teleradiographs (lateral cephalometric radiographs) and cast models of subjects with a naturally optimal occlusion and at least four of the six keys of Andrews, for optimal occlusion...
January 2014: Journal of Contemporary Dental Practice
Hong-Tzong Yau, Tsan-Jui Yang, Yi-Chen Chen
This paper proposes a full tooth reconstruction method by integrating 3D scanner data and computed tomography (CT) image sets. In traditional dental treatment, plaster models are used to record patient׳s oral information and assist dentists for diagnoses. However, plaster models only save surface information, and are therefore unable to provide further information for clinical treatment. With the rapid development of medical imaging technology, computed tomography images have become very popular in dental treatment...
May 2014: Computers in Biology and Medicine
P B Özat, İ Tuncel, E Eroğlu
Deficiencies in the human visual percep-tion system have challenged the efficiency of the visual shade-matching protocol. The aim of this study was to evaluate the repeatability and reliability of human eye in visual shade selection. Fifty-four volunteering dentists were asked to match the shade of an upper right central incisor tooth of a single subject. The Vita 3D-Master shade guide was used for the protocol. Before each shade-matching procedure, the definitive codes of the shade tabs were hidden by an opaque strip and the shade tabs were placed into the guide randomly...
December 2013: Journal of Oral Rehabilitation
S Jaussaud, S Guihard, C Niederst, C Borel, P Meyer, P Hémar, P Schultz, G Noël, A Féki
PURPOSE: We compared intensity-modulated radiotherapy and 3D-conformal irradiation in oropharyngeal cancers according to the requirement of dentists. MATERIAL AND METHODS: From the files of seven patients with cancer of the oropharynx, two dosimetry plannings for 3D-conformal radiotherapy and intensity-modulated radiotherapy with tomotherapy were performed. The dose distributions in the target volumes and organs at risk in relation to the dental sphere were compared...
July 2013: Cancer Radiothérapie: Journal de la Société Française de Radiothérapie Oncologique
J Strecha, R Jurkovic, T Siebert
UNLABELLED: Subject matter: The dentist has to deal with complicated cases of fused molars, which are rather rare and morphologically very varied. A wrong or incomplete diagnosis can considerably complicate a planned therapy. CASE REPORT: The authors describe a case of apical periodontal complication of fused teeth that had to be removed surgically. The upper 2nd molar fused with the impacted 3rd molar and was diagnosed for extraction. CONCLUSION: Even a careful diagnostic procedure and X-ray image sometimes may not indicate the exact location and mutual position of the fused teeth...
2012: Bratislavské Lekárske Listy
Yunzhu Qian, Xuefeng Zhou, Jianxin Yang
BACKGROUND/AIM: This paper explored the correlation between cuspal inclination and tooth cracked syndrome by measuring and reconstructing the cuspal inclinations of cracked maxillary first molars through three-dimensional (3D) finite element analysis (FEA). MATERIAL AND METHODS: The cuspal inclinations of 11 maxillary left first molars with cracked tooth syndrome and 22 intact controls were measured by 3D reconstruction. The mean values of each group were used to construct two 3D finite element models of maxillary first molar for comparing stress distribution under the loads of 200N at 0°, 45°, and 90°, respectively, to the tooth axis...
June 2013: Dental Traumatology: Official Publication of International Association for Dental Traumatology
Carla Vecchione Gurgel, Ana Lidia Soares Costa, Tatiana Yurico Kobayashi, Daniela Rios, Salete Moura Bonifacio Silva, Maria Aperecida de Andrade Moreira Machado, Thais Marchini Oliveira
Conventional radiographic images are frequently used to detect supernumerary teeth. However, recent developments in 3D imaging systems have enabled dentists to better visualize supernumerary teeth, with better contrast and more details. Cone beam computed tomography (CBCT) has improved diagnosis and treatment planning of patients with supernumerary teeth. The decision to use CBCT should be based on the diagnostic information required. This article presents three case reports of patients with supernumerary teeth to demonstrate the need for accurate diagnosis and treatment planning based on a comprehensive evaluation using CBCT...
May 2012: General Dentistry
Lieve Van Zeghbroeck
BACKGROUND: When elderly develop signs and symptoms of Alzheimer's disease they lose their independence and neglect dental hygiene. Dentists are increasingly confronted by seniors who are in need but who have limited access to dental care. Caretakers and family are also often confronted with behaviour problems besides the dental problems. OBJECTIVE: To report the importance of shorter and lower impact treatment for seniors when caretakers and family are confronted with a behavioural problem in addition to the dental problem...
June 2012: Gerodontology
Andreas P Litzenburger, Reinhard Hickel, Maria J Richter, Albert C Mehl, Florian A Probst
OBJECTIVES: The aim of this study was to compare the occlusal morphology of partial crown reconstructions made by dental technicians with reconstructions made by a fully automatic software process (biogeneric tooth model) in relation to the original natural tooth shape. MATERIAL AND METHODS: Stone replicas of natural teeth were measured three-dimensionally before preparing inlay and onlay cavities for ceramic restorations (n = 5). For each preparation, five reconstructions (in total n = 25) were made by five dental technicians...
March 2013: Clinical Oral Investigations
Susanne Wriedt, Jennifer Jaklin, Bilal Al-Nawas, Heiner Wehrbein
AIM: The purpose of this diagnostic cross-over study was to evaluate whether three-dimensional (3D) diagnostics (cone-beam computed tomography, CBCT) was superior to two-dimensional (2D) diagnostics (panoramic X-ray, OPG) in patients with impacted upper canines for assessing their position and the probability of their alignment. MATERIALS AND METHODS: Panoramic X-rays, CBCTs, and study casts of 21 patients with a total of 29 impacted maxillary canines were analyzed...
January 2012: Journal of Orofacial Orthopedics, Fortschritte der Kieferorthopädie
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