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Dental Software

Ling Chen, Yanqin Feng, Jianguo Sun
This paper discusses regression analysis of clustered failure time data, which occur when the failure times of interest are collected from clusters. In particular, we consider the situation where the correlated failure times of interest may be related to cluster sizes. For inference, we present two estimation procedures, the weighted estimating equation-based method and the within-cluster resampling-based method, when the correlated failure times of interest arise from a class of additive transformation models...
October 19, 2016: Lifetime Data Analysis
G F Ferrazzano, S Orlando, T Cantile, G Sangianantoni, B Alcidi, M Coda, S Caruso, A Ingenito
AIM: The elaboration of an experimental system to obtain reproducible and comparable photographs of the occlusal surface to monitor sealants retention. MATERIALS AND METHODS: An intraoral camera connected to a computer was used to obtain photos of the occlusal surfaces. A specific software was utilized to perform measurements on archived pictures. An experimental two-part system, consisting of a dental arch support and a camera support, connected to each other through holes and pins, was made to obtain a standardised and reproducible placement of the camera in the mouth...
September 2016: European Journal of Paediatric Dentistry: Official Journal of European Academy of Paediatric Dentistry
Harsh Pipalia, Praveen Ganesh, Samarth Shetty, Paul C Salins, Rohan Raut, Kiran Kumar Boyina
Three-dimensional virtual surgery programs are widely available for orthognathic surgery. The advent of imaging software programs has proved to be useful for diagnosis, treatment planning, outcome measurement, and three-dimensional surgical simulation. Complex maxillofacial malformations continue to present challenges in analysis and correction beyond modern technology. Orthomorphic correction for mandibular dysmorphology refers to basal bone movement without any change in dental component. The purpose of this paper is to present a virtual surgery planning for surgeons to perform the orthomorphic surgery with precision and quantification...
October 14, 2016: Journal of Craniofacial Surgery
Chris S Ivanoff, Krassimira Yaneva, Diana Luan, Bogomil Andonov, Reena R Kumar, Anirudha Agnihotry, Athena E Ivanoff, Dimitrios Emmanouil, Luiz Evaristo Ricci Volpato, Filip Koneski, Ilijana Muratovska, Huda A Al-Shehri, Sara M Al-Taweel, Michele Daly
BACKGROUND: Training culturally competent graduates who can practice effectively in a multicultural environment is a goal of contemporary dental education. The Global Oral Health Initiative is a network of dental schools seeking to promote global dentistry as a component of cultural competency training. OBJECTIVE: Before initiating international student exchanges, a survey was conducted to assess students' awareness of global dentistry and interest in cross-national clerkships...
October 18, 2016: International Dental Journal
H Wang, P J Lv, Y Wang, Y C Sun
OBJECTIVE: To quantitatively evaluate the assembly precision of fabricating complete denture by computer numerical control (CNC) in manufacturing dentition and baseplate separately plus adhesive molding. METHODS: The 3D surface data of a standard edentulous maxilla plaster cast model and the temporary base-plate were obtained using an Activity 880 3D scanner. The data (data1) of a complete denture were designed using a set of computer aided design (CAD) software developed by the research group of this study...
October 18, 2016: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
Miyuki Omori, Yuji Sato, Noboru Kitagawa, Yuta Shimura, Manabu Ito
BACKGROUND: Three-dimensional finite element analysis (FEA) is effective in analyzing stress distributions around dental implants. However, FEA of living tissue involves many conditions, and the structures and behaviors are complex; thus, it is difficult to ensure the validity of the results. To verify reproducibility and validity, we embedded implants in experimental models and constructed FEA models; implant displacements were compared under various loading conditions. METHODS: Implants were embedded in the molar regions of artificial mandibles to fabricate three experimental models...
December 2015: Int J Implant Dent
Mieszko Wieckiewicz, Natalia Grychowska, Marek Zietek, Wlodzimierz Wieckiewicz
Background. Addition silicones are popular as dental impression materials and are used in bite registration procedures. Objective. This study aimed to compare the postsetting elasticities and other mechanical properties of thirteen addition silicone interocclusal recording materials. Materials and Methods. The following materials were investigated: Colorbite D, Futar D, Genie Bite, Jet Blue Bite fast, Memoreg 2, O-Bite, Occlufast Rock, Omni-Bite Plus, Regidur i, Registrado X-tra, Regofix transparent, StoneBite, and Variotime Bite...
2016: BioMed Research International
Gerardo Mendoza-Azpur, Miguel Lau, Erick Valdivia, Jorge Rojas, Henry Muñoz, Myron Nevins
In oral rehabilitation, crown-to-root ratio is accepted as an indicator of bone loss, and this concept was transferred to implants. Recent studies have indicated that there is no significant difference between short and standard implants. The aim of this study was to compare marginal bone-level alteration through radiographic evaluation and clinical parameters between short and standard implants supporting single crowns. This prospective clinical trial study included 82 systemically healthy, nonsmoking subjects...
November 2016: International Journal of Periodontics & Restorative Dentistry
Fernanda P Bragatto, Mariliani Chicarelli, Amanda Vb Kasuya, Wilton M Takeshita, Liogi Iwaki-Filho, Lilian Cv Iwaki
INTRODUCTION: The golden proportion has been used in dentistry in an attempt to improve facial function and, possibly, esthetics by simplifying the diagnosis of facial and dental disharmony. The aim of this study is to analyze pre- and postoperative cephalometric tracings of lateral cephalograms of patients with class II and III deformities submitted to orthognathic surgery, and verify if the 13 dental-skeletal patterns (ratios), as defined by Ricketts, moved closer to or further away from the golden proportion...
September 1, 2016: Journal of Contemporary Dental Practice
Rohit Yadav, Kaushal Kishor Agrawal, Jitendra Rao, Mohd Anwar, Habib Ahmed Alvi, Kalpana Singh, D Himanshu
PURPOSE: To compare crestal bone loss around dental implants using a delayed loading protocol. Bone loss was compared in patients following conventional full thickness flap and flapless surgery in controlled type 2 diabetic patients. MATERIALS AND METHODS: Eighty-eight type 2 diabetic patients satisfying predetermined inclusion and exclusion criteria were selected for this single center, parallel group study after obtaining institutional review board approval and informed consent...
October 12, 2016: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
Yusuke Takahashi, Takao Watanabe, Akira Iimura, Osamu Takahashi
In this paper, using full-body CT images of elderly and advanced elderly Japanese cadavers, we measure maxillary and other paranasal sinus volumes in order to examine the effects of age, sex, presence or absence of maxillary molars, and other factors on changes to maxillary sinus volume. The research subjects consisted of 77 of 95 cadavers donated to the Kanagawa Dental University between 2012 and 2014, which average age was 82.6 ± 10 years (33 were male, average age 79.3 ± 8.3 years, and 44 were female, average age 85...
2016: Okajimas Folia Anatomica Japonica
Manjiri Joshi, Mansi Tailor
BACKGROUND: Oral cancer is a major health problem in tobacco users worldwide and is one of the ten most common cancers. India alone accounts for 1/3 rd of the world's oral cancer and has a high rate of potentially malignant disorders (PMDs). The most common predisposing factors are smoking, smokeless tobacco, betel nut in quid form (pan), alcohol, spicy food, and sharp broken tooth. There are various tobacco-associated lesions (TALs) which can be diagnosed at very early stage. This study was conducted to rule out association of smoking and smokeless tobacco with occurrence of TALs and its dose-response relationship...
July 2016: Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research
Y Wang, Y Lin, B Chen, Y Zhang, P Di, C Yi
Objective: To assess and compare the radiographic outcomes of immediate implant placement with two different loading timing. Methods: The involved cases were collected from Department of Implantology, Peking University School and Hospital of Stomatology. Patients recieved immediate implant placement during 2010 Aug to 2012 Dec. The cases admitted delayed restoration program were assigned to Group Ⅰ(18 patients with 21 implants), the cases admitted immediate restoration program were assigned to Group Ⅱ (16 patients with 22 implants)...
October 9, 2016: Zhonghua Kou Qiang Yi Xue za Zhi, Zhonghua Kouqiang Yixue Zazhi, Chinese Journal of Stomatology
Wojtek Libecki, Adham Elsayed, Sandra Freitag-Wolf, Matthias Kern
OBJECTIVE: The aim of this laboratory study was to evaluate the horizontal and vertical effects of the polymerization shrinkage of three-unit temporary fixed dental prostheses (FDPs) on the position of the prepared teeth. In addition, the reduction of these effects by using different fabrication techniques was evaluated. METHODS: A total of 192 temporary FDPs were fabricated using one methacrylate (MA) and two dimethacrylate (DMA) materials. Each material group (n=64) was divided into two groups according to the fabrication methods (M1: curing on the prepared teeth, M2: curing in a silicone mold)...
October 1, 2016: Dental Materials: Official Publication of the Academy of Dental Materials
S Barone, A Paoli, A V Razionale, R Savignano
Transparent and removable aligners represent an effective solution to correct various orthodontic malocclusions through minimally invasive procedures. An aligner-based treatment requires patients to sequentially wear dentition-mating shells obtained by thermoforming polymeric disks on reference dental models. An aligner is shaped introducing a geometrical mismatch with respect to the actual tooth positions to induce a loading system, which moves the target teeth toward the correct positions. The common practice is based on selecting the aligner features (material, thickness, and auxiliary elements) by only considering clinician's subjective assessments...
October 5, 2016: International Journal for Numerical Methods in Biomedical Engineering
Fernando R Carvalho, Débora A Lentini-Oliveira, Lucila Bf Prado, Gilmar F Prado, Luciane Bc Carvalho
BACKGROUND: Apnoea is a breathing disorder marked by the absence of airflow at the nose or mouth. In children, risk factors include adenotonsillar hypertrophy, obesity, neuromuscular disorders and craniofacial anomalies. The most common treatment for obstructive sleep apnoea syndrome (OSAS) in childhood is adeno-tonsillectomy. This approach is limited by its surgical risks, mostly in children with comorbidities and, in some patients, by recurrence that can be associated with craniofacial problems...
October 5, 2016: Cochrane Database of Systematic Reviews
Diego Lops, Edoardo Stellini, Luca Sbricoli, Niccolò Cea, Eugenio Romeo, Eriberto Bressan
PURPOSE: The aim of the present clinical trial was to analyze, through spectrophotometric digital technology, the influence of the abutment material on the color of the peri-implant soft tissue in patients with thin gingival biotype. MATERIAL AND METHODS: Thirty-seven patients received an endosseous dental implant in the anterior maxilla. At time of each definitive prosthesis delivery, an all-ceramic crown has been tried on gold, titanium and zirconia abutment. Peri-implant soft-tissue color has been measured through a spectrophotometer after the insertion of each single abutment...
October 3, 2016: Clinical Oral Implants Research
Marcelo Coelho Goiato, Rodrigo Antonio de Medeiros, Mariana Vilela Sônego, Taynara Maria Toito de Lima, Aldiéris Alves Pesqueira, Daniela Micheline Dos Santos
Short dental implants have been used as an attempt to avoid bone grafts surgery, however there are few literature reports that evaluate changes to their design. Therefore, the aim of this study was to assess the effect of different short implant design on stress distribution through photoelastic analysis. Six external hexagon (5 × 5 mm) short dental implants with different design were used. Each group was treated with a single crown and a three element fixed partial dental prosthesis, resulting in a total of 12 photoelastic models...
October 4, 2016: Journal of Medical Engineering & Technology
E Bocaege, S Hillson
OBJECTIVES: The investigation of the record of growth locked in dental enamel provides a unique opportunity to build a comprehensive picture of growth disruption episodes during childhood. This study presents a new methodological basis for the analysis of enamel growth disruptions (enamel hypoplasia) using incremental microstructures of enamel. METHODS: A three-dimensional technique based upon use of an Alicona 3D Infinite Focus imaging microscope and software is used to record developmental features in the enamel of human permanent mandibular lateral incisors of one individual from the Neolithic site of Çatalhöyük (Turkey)...
October 3, 2016: American Journal of Physical Anthropology
Mayara B V Mundim, Danilo R Dias, Ronaldo M Costa, Cláudio R Leles, Paulo M Azevedo-Marques, Rejane F Ribeiro-Rotta
BACKGROUND AND OBJECTIVES: Computer vision extracts features or attributes from images improving diagnosis accuracy and aiding in clinical decisions. This study aims to investigate the feasibility of using texture analysis of periapical radiograph images as a tool for dental implant treatment planning. METHODS: Periapical radiograph images of 127 jawbone sites were obtained before and after implant placement. From the superimposition of the pre- and post-implant images, four regions of interest (ROI) were delineated on the pre-implant images for each implant site: mesial, distal and apical peri-implant areas and a central area...
November 2016: Computer Methods and Programs in Biomedicine
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