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Dental crowns

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https://www.readbyqxmd.com/read/29676971/conservative-treatment-of-a-complicated-crown-root-fracture-using-adhesive-fragment-reattachment-and-composite-resin-restoration-two-year-follow-up
#1
A V Martins, R C Albuquerque, L D Lanza, Ê L Vilaça, Nrfa Silva, A N Moreira, R R da Silveira
Crown-root fracture is one of the most challenging fracture types in the dental traumatology literature. Traumatized anterior teeth require quick functional and esthetic repair. In the case of a complex crown fracture of the maxillary left central incisor, requiring endodontic treatment, a fiber-reinforced post was used to create a central support stump to restore the dental morphology. This report describes the clinical procedures involved in the treatment. After two years of follow-up, the clinical and radiographic findings demonstrated that the adopted clinical protocol was successful and yielded healthy periodontal tissues with no signs of periradicular pathology...
May 2018: Operative Dentistry
https://www.readbyqxmd.com/read/29674734/convergence-angles-for-full-veneer-crown-preparation-completed-by-undergraduate-students-in-a-dental-teaching-hospital
#2
S S Virdee, L D Addy, P J Milward, C D Lynch
No abstract text is available yet for this article.
April 20, 2018: British Dental Journal
https://www.readbyqxmd.com/read/29673708/fractographic-analyses-of-failed-one-piece-zirconia-implant-restorations
#3
Marit Øilo, Dwayne Arola
BACKGROUND: Promising results of initial clinical trials with yttria-stabilized zirconia have led to more extensive use of zirconia in dental implant superstructures. The applications have extended to abutments and complex individually designed crown-abutment one-piece structures. Little is known about their clinical success and the primary cause of failures. PURPOSE: The aim of this study was to identify the cause of fracture of retrieved implant-retained one-piece prostheses that failed during clinical use...
April 16, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29673430/hypobaric-conditions-and-retention-of-dental-crowns-luted-with-manually-or-automixed-dental-cements
#4
Andrej M Kielbassa, Johannes A G Müller
BACKGROUND: There is only scant information on the influence of the hypobaric environment on luting agents and their efficacy on dental crown cementation. The objective of this study was to provide data on the retentive characters of two cements commonly used on implant abutment surfaces both under normal and under hypobaric conditions. METHODS: There were 56 implant abutments supplied with CAD/CAM milled zirconia oxide crowns. 1) A zinc phosphate cement (ZP), and 2) a resin-modified glass ionomer cement (RMGI), each mixed either A) manually or B) by means of automix capsules, were used for cementation...
May 1, 2018: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/29670720/clinical-and-radiographic-assessment-of-reasons-for-replacement-of-metal-ceramic-fixed-dental-prostheses-in-patients-referring-to-dental-school
#5
Roa'a Al Refai, Samah Saker
Background: The expected length of service and reasons for fixed dental prostheses (FDPs) replacement are a frequent inquiry by patients while the answers were mainly based on studies reports that was conducted outside the middle east region. This clinical and radiographic survey was constructed to assess and survey clinically and radiographically the reasons of replacement of metal-ceramic fixed dental prostheses, amongst patients reporting at dental school in Taibah University. Material and Methods: Between January and May 2016, 151 patients were recruited for this study...
January 2018: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/29670714/the-evaluation-of-root-fracture-with-cone-beam-computed-tomography-cbct-an-epidemiological-study
#6
Mehmet-Sinan Doğan, Michele Callea, Lindawati S Kusdhany, Ahmet Aras, Diah-Ayu Maharani, Masita Mandasari, Melissa Adiatman, Izzet Yavuz
Background: The aim of this study was evaluation of the cone-beam computed tomography (CBCT) image of 50 patients at the ages of 8-15 suspecting root fracture and root fracture occurred, exposed to dental traumatic. In additionally, this study was showed effect of crown fracture on root fracture healing. Material and Methods: All of the individuals included in the study were obtained images with the cone-beam computed tomography range of 0,3 voxel and 8.9 seconds...
January 2018: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/29667468/growth-hormone-receptor-gene-is-related-to-root-length-and-tooth-length-in-human-teeth
#7
Yu Hikita, Tetsutaro Yamaguchi, Daisuke Tomita, Mohamed Adel, Takatoshi Nakawaki, Koshu Katayama, Koutaro Maki, Ryosuke Kimura
OBJECTIVES: To examine the relationship between tooth length and growth hormone receptor (GHR) gene variants in a healthy Japanese population. MATERIALS AND METHODS: The subjects consisted of 193 Japanese adults (69 men, 124 women), aged 13 to 56 years. Genomic DNA was extracted from saliva and genotyped GHR rs6184 and rs6180 variants using the Taqman genotyping. Computed tomography (CT) images were acquired using a dental cone-beam CT scanner and reconstructed using open-source OsiriX medical image processing software...
April 18, 2018: Angle Orthodontist
https://www.readbyqxmd.com/read/29663972/a-multidisciplinary-approach-to-restore-an-unconventional-crown-removal-of-traumatized-permanent-central-incisors
#8
Richard E Campbell, Heather T Morris, Kyle T Reynolds, Elizabeth S Gosnell
A 13-year-old female presented with traumatized maxillary central incisors that had been endodontically treated. Five years later, at a different dental office, she had the clinical crowns removed, leaving subgingival margins. From the patient's history and our initial assessment, it seemed as if the teeth had been fractured and luxated but not avulsed. Endodontic posts with spot-welded orthodontic brackets were temporarily cemented to enable orthodontic extrusion. Once access to restorable margins was obtained, the temporary posts were removed and conventional fiber posts with interim composite crowns were placed...
January 15, 2018: Journal of Dentistry for Children
https://www.readbyqxmd.com/read/29663970/pediatric-dentists-treatment-planning-decisions-for-class-ii-carious-lesions-in-primary-molars
#9
Martha Holland, Caroline Carrico, Tiffany Williams
PURPOSE: To assess pediatric dentists' choice for restoring Class II carious lesions in primary molars. METHODS: A survey with eight cases of class II carious lesions was emailed to American Academy of Pediatric Dentistry members, who were asked to choose either a stainless steel crown (SSC) or composite resin as a final restoration, or no treatment. Treatment decisions were compared to evidence-based treatment recommendations. Repeated measures logistic regression was used to determine factors associated with treatment decisions...
January 15, 2018: Journal of Dentistry for Children
https://www.readbyqxmd.com/read/29663915/microleakage-of-cements-in-prefabricated-zirconia-crowns
#10
Paula Stepp, Brian R Morrow, Martha Wells, David A Tipton, Franklin Garcia-Godoy
PURPOSE: The purpose of this study was to investigate and compare microleakage of prefabricated posterior NuSmile® ZR and EZCrowns when cemented with BioCem and Ketac Cem dental cements. METHODS: Forty extracted permanent teeth (n equals 10 per group) were fitted for either NuSmile or EZCrowns prefabricated posterior zirconia crowns and cemented with BioCem or Ketac Cem, for a total of four groups. Crowned teeth were placed in Dulbecco's Phosphate Buffered Saline solution at 37 degrees Celsius for 24 hours...
March 15, 2018: Pediatric Dentistry
https://www.readbyqxmd.com/read/29663912/periodontal-impact-of-preformed-metal-crowns-on-permanent-molars-of-children-and-adolescents-a-pilot-study
#11
Aikaterini Koleventi, Dimitra Sakellari, Konstantinos N Arapostathis, Nikolaos Kotsanos
PURPOSE: When treating an early permanent molar with coronal malformation in children, as in severe molar incisor hypomineralization (MIH) cases, preformed metal crowns (PMCs) are a successful mid- to long-term restorative option. The purpose of this study was to evaluate possible changes in periodontal tissues and subgingival microbiota after PMC placement by way of a split-mouth study. METHODS: Fourteen healthy patients with a mean age of 10.6 (±4.2) years old, attending a university dental clinic, had one MIH severely affected permanent first molar restored with a PMC (study side), while the contralateral relatively healthy tooth was the control...
March 15, 2018: Pediatric Dentistry
https://www.readbyqxmd.com/read/29657498/odontometric-sex-estimation-from-clinically-extracted-molar-teeth-in-a-north-indian-population-sample
#12
Qutsia Tabasum, Jagmahender Singh Sehrawat, Manjit Kaur Talwar, Raj Kamal Pathak
Background: Different dental features have contributed significantly toward sex determination in the forensic anthropological contexts. Population-specific standards (discriminant functions or regression formulae) have been suggested for various population groups to identify the sex of an unknown individual from dental dimensions and other odontometric features. The main purpose of the present investigation was to examine the degree of sexual dimorphism exhibited by the human teeth of North Indians and identify importance as a forensic tool in sex determination...
September 2017: Journal of Forensic Dental Sciences
https://www.readbyqxmd.com/read/29657495/the-effects-of-temperature-on-extracted-teeth-of-different-age-groups-a-pilot-study
#13
Renjith George, Wesley Joel Tan, Agnes Liong Shih Yi, Preethy Mary Donald
Context: Type of dentition and age related changes may affect the behavior of dental hard tissues under thermal stress. Aim: This study was conducted to analyze the effects of varying temperatures on extracted teeth of different age groups in a simulated laboratory set up. Settings and Design: Experimental pilot study. Methods and Material: Extracted teeth from three age groups (deciduous, young permanent and adult permanent) were collected and were exposed to three different temperatures (400°C, 700°C and 1000°C) in a laboratory set up...
September 2017: Journal of Forensic Dental Sciences
https://www.readbyqxmd.com/read/29657361/cone-beam-computed-tomography-for-assessment-of-dens-invaginatus-in-the-polish-population
#14
T Katarzyna Różyło, Ingrid Różyło-Kalinowska, Magdalena Piskórz
Objectives: There are many developmental variations in the permanent dentition. Dens invaginatus can be recognized on many dental X-rays of affected patients, but not every image allows for assessment of the type of malformation. The aim of the present study was to assess the presence of dens invaginatus with radiological features using cone-beam computed tomography (CBCT). Methods: CBCT images of 33 patients were evaluated. Age, sex, side, lateralization, occurrence in a particular group of teeth, type of invagination, differentiation, and the consequences of these factors were analyzed...
2018: Oral Radiology
https://www.readbyqxmd.com/read/29651146/high-resolution-computed-tomographic-analysis-of-tooth-replacement-pattern-of-the-basal-neoceratopsian-liaoceratops-yanzigouensis-informs-ceratopsian-dental-evolution
#15
Yiming He, Peter J Makovicky, Xing Xu, Hailu You
The dental morphology and tooth replacement pattern of Liaoceratops yanzigouensis, the earliest known neoceratopsian, are important for our understanding of the evolution of the ceratopsian dental system. Here we describe the dental morphology and tooth replacement of Liaoceratops yanzigouensis based on high-resolution computed tomographic (CT) scan data of three specimens including the holotype, the first study for basal ceratopsian. The three-dimensional reconstructions reveal some important new information, including: three teeth in the premaxilla in one side, two more teeth in the dentary than in the maxilla, incipiently developed mesial grooves on some crowns, two generations of replacement teeth within some tooth families; and most functional teeth were under heavy resorption by the replacement process, but still remained functional...
April 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29643529/-retrospective-study-of-dental-treatment-under-general-anesthesia-of-62-disabled-children-and-adolescents
#16
N Wang, Y M Zhao
OBJECTIVE: To retrospectively figure out the oral health status, treatment and follow-ups after dental treatment under general anesthesia (DGA) of disabled children or adolescents. METHODS: Clinical data of disabled children or adolescents and normal children as control received DGA in the Department of Pediatric Dentistry, Peking University School and Hospital of Stomatology from August 2008 to September 2015 were recorded, including: gender, birth date, treatment date, disability type, oral health status before treatment, treatment content and follow-ups (in 1 year)...
April 18, 2018: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/29627209/digital-evaluation-of-absolute-marginal-discrepancy-a-comparison-of-ceramic-crowns-fabricated-with-conventional-and-digital-techniques
#17
Shanshan Liang, Fusong Yuan, Xu Luo, Zhuoren Yu, Zhihui Tang
STATEMENT OF PROBLEM: Marginal discrepancy is key to evaluating the accuracy of fixed dental prostheses. An improved method of evaluating marginal discrepancy is needed. PURPOSE: The purpose of this in vitro study was to evaluate the absolute marginal discrepancy of ceramic crowns fabricated using conventional and digital methods with a digital method for the quantitative evaluation of absolute marginal discrepancy. The novel method was based on 3-dimensional scanning, iterative closest point registration techniques, and reverse engineering theory...
April 5, 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29625251/the-influence-of-temporomandibular-joint-movement-parameters-on-dental-morphology
#18
Luminita Oancea, Roxana Stegaroiu, Corina Marilena Cristache
Association between tooth morphology, occlusal relations and mandibular condyle/glenoid fossa morphology is still a controversial issue in dentistry. The aim of the present study was to examine the influence of three important articular parameters on the dental morphology and the crown volume, quantifying the variation for each tooth group: incisor, canine, premolar and molar. MATERIALS AND METHODS: All maxillary teeth from a set of basic study models were prepared for zirconia single crowns...
April 3, 2018: Annals of Anatomy, Anatomischer Anzeiger: Official Organ of the Anatomische Gesellschaft
https://www.readbyqxmd.com/read/29621687/viscoelastic-finite-element-analysis-of-residual-stresses-in-porcelain-veneered-zirconia-dental-crowns
#19
Jeongho Kim, Sukirti Dhital, Paul Zhivago, Marina R Kaizer, Yu Zhang
The main problem of porcelain-veneered zirconia (PVZ) dental restorations is chipping and delamination of veneering porcelain owing to the development of deleterious residual stresses during the cooling phase of veneer firing. The aim of this study is to elucidate the effects of cooling rate, thermal contraction coefficient and elastic modulus on residual stresses developed in PVZ dental crowns using viscoelastic finite element methods (VFEM). A three-dimensional VFEM model has been developed to predict residual stresses in PVZ structures using ABAQUS finite element software and user subroutines...
March 21, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29615324/comparing-the-accuracy-trueness-and-precision-of-models-of-fixed-dental-prostheses-fabricated-by-digital-and-conventional-workflows
#20
Ji-Young Sim, Yeon Jang, Woong-Chul Kim, Hae-Young Kim, Dong-Hwan Lee, Ji-Hwan Kim
PURPOSE: This study aimed to evaluate and compare the accuracy. METHODS: A reference model was prepared with three prepared teeth for three types of restorations: single crown, 3-unit bridge, and inlay. Stone models were fabricated from conventional impressions. Digital impressions of the reference model were created using an intraoral scanner (digital models). Physical models were fabricated using a three-dimensional (3D) printer. Reference, stone, and 3D printed models were subsequently scanned using an industrial optical scanner; files were exported in a stereolithography file format...
March 31, 2018: Journal of Prosthodontic Research
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