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Dental errors

Biser Stoichkov, Dimitar Kirov
OBJECTIVE: Fracture of osseointegrated dental implants is the most severe mechanical complication. The aim of the present study was to analyze possible causative factors for implant body fracture. METHOD AND MATERIALS: One hundred and one patients with 218 fitted implants and a follow-up period of 3 to 10 years were studied. Factors associated with biomechanical and physiologic overloading such as parafunctional activity (eg, bruxism), occlusion, and cantilevers, and factors related to the planning of the dental prosthesis, available bone volume, implant area, implant diameter, number of implants, and their inclination were tracked...
February 12, 2018: Quintessence International
Nicholas G Norvell, Tom V Korioth, David R Cagna, Antheunis Versluis
STATEMENT OF PROBLEM: Artificial markers called fiducials are commonly used to orient digitized surfaces for analysis. However, when these markers are tangible and placed in the region of interest, they may alter surface topography and influence data analysis. PURPOSE: The purpose of this in vitro study was to apply a modified digital surface fitting method based on anatomic landmarks to evaluate denture accuracy and to use 2 different denture processing techniques to evaluate the method...
February 8, 2018: Journal of Prosthetic Dentistry
Temitope A Esan, Lynne A Schepartz
The accuracies of the original Demirjian, modified Demirjian and Willems dental age estimation methods were compared for a Black Southern African population to determine their usefulness for forensic and anthropological purposes. Data were collected using a community-based prospective study design. Panoramic radiographs of seven left mandibular teeth from 540 children aged 5-15.99 years were scored using the three methods. Obtained estimates were compared to the chronological ages and mean absolute errors were calculated...
February 1, 2018: Legal Medicine
Mohammed Hussein M Alsharbaty, Marzieh Alikhasi, Simindokht Zarrati, Ahmed Reza Shamshiri
PURPOSE: To evaluate the accuracy of a digital implant impression technique using a TRIOS 3Shape intraoral scanner (IOS) compared to conventional implant impression techniques (pick-up and transfer) in clinical situations. MATERIALS AND METHODS: Thirty-six patients who had two implants (Implantium, internal connection) ranging in diameter between 3.8 and 4.8 mm in posterior regions participated in this study after signing a consent form. Thirty-six reference models (RM) were fabricated by attaching two impression copings intraorally, splinted with autopolymerizing acrylic resin, verified by sectioning through the middle of the index, and rejoined again with freshly mixed autopolymerizing acrylic resin pattern (Pattern Resin) with the brush bead method...
February 9, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
Verónica San José, Carlos Bellot-Arcís, Beatriz Tarazona, Natalia Zamora, Manuel O Lagravère, Vanessa Paredes-Gallardo
Background: To compare the reliability and accuracy of direct and indirect dental measurements derived from two types of 3D virtual models: generated by intraoral laser scanning (ILS) and segmented cone beam computed tomography (CBCT), comparing these with a 2D digital model. Material and Methods: One hundred patients were selected. All patients' records included initial plaster models, an intraoral scan and a CBCT. Patients´ dental arches were scanned with the iTero® intraoral scanner while the CBCTs were segmented to create three-dimensional models...
December 2017: Journal of Clinical and Experimental Dentistry
Alexandros Mandalidis, Antonios Topalidis, Evangelos A Voudrias, Nikolaos Iosifidis
The overall objective of this work is to determine the composition, characterization and production rate of Greek dental solid waste (DSW). This information is important to design and cost management systems for DSW, for safety and health considerations and for assessing environmental impact. A total of 141 kg of DSW produced by a total of 2542 patients in 20 dental practices from Xanthi, Greece was collected, manually separated and weighed over a period of four working weeks. The waste was separated in 19 sub fractions, which were classified in 2 major categories, according to Greek regulations: Domestic-type waste comprising 8% and hazardous waste comprising 92% by weight of total DSW...
February 1, 2018: Waste Management
Paul S Petrungaro, Santiago Gonzalez, Carlos Villegas
As dental implants become more popular for the treatment of partial and total edentulism and treatment of "terminal dentitions," techniques for the management of the atrophic posterior maxillae continue to evolve. Although dental implants carry a high success rate long term, attention must be given to the growing numbers of revisions or retreatment of cases that have had previous dental implant treatment and/or advanced bone replacement procedures that, due to either poor patient compliance, iatrogenic error, or poor quality of the pre-existing alveolar and/or soft tissues, have led to large osseous defects, possibly with deficient soft-tissue volume...
February 2018: Compendium of Continuing Education in Dentistry
M A Chaudhary, H M Liversidge
BACKGROUND: Visibility of the periodontal ligament of mandibular third molars (M3) has been suggested as a method to estimate age. AIM: To assess the accuracy of this method and compare the visibility of the periodontal ligament in the left M3 with the right M3. The sample was archived panoramic dental radiographs of 163 individuals (75 males, 88 females, age 16-53 years) with mature M3's. MATERIALS AND METHODS: Reliability was assessed using Kappa...
December 1, 2017: Journal of Forensic Odonto-stomatology
A Lo Giudice, R Fastuca, M Portelli, A Militi, M Bellocchio, P Spinuzza, F Briguglio, A Caprioglio, R Nucera
AIM: To evaluate the methodological feasibility of a RCT comparing skeletal changes of nasal cavity size obtained with RME and SME, assessed via CBCT. MATERIALS AND METHODS: Twenty Caucasian children with a mean age of 10.4 years were recruited and allocated to receive RME (10 subjects, mean age 10.4 years) or SME (10 subjects, mean age 10.5 years). INCLUSION CRITERIA: constricted maxillary arch, upper and lower first molars erupted, unilateral or bilateral posterior crossbite...
December 2017: European Journal of Paediatric Dentistry: Official Journal of European Academy of Paediatric Dentistry
P K Shah, B S Chong
OBJECTIVE: To develop a web-based tool to facilitate identification, evaluation and management of teeth requiring endodontic treatment. MATERIALS AND METHODS: Following a literature search and thorough analysis of existing case difficulty assessment forms, the web-based tool was developed using an online survey builder (Qualtrics, Qualtrics Lab, UT, USA). Following feedback from a pilot study, it was refined and improved. A study was performed, using the updated version (EndoApp) on a cohort (n = 53) of dental professionals and dental students...
January 25, 2018: Clinical Oral Investigations
Eduarda Helena Leandro Nascimento, Hugo Gaêta-Araujo, Maria Fernanda Silva Andrade, Deborah Queiroz Freitas
OBJECTIVES: The aims of this study are to identify the most frequent technical errors in endodontically treated teeth and to determine which root canals were most often associated with those errors, as well as to relate endodontic technical errors and the presence of coronal restorations with periapical status by means of cone-beam computed tomography images. METHODS: Six hundred eighteen endodontically treated teeth (1146 root canals) were evaluated for the quality of their endodontic treatment and for the presence of coronal restorations and periapical lesions...
January 21, 2018: Clinical Oral Investigations
Chenxin Wang, Yi Liu, Siwei Wang, Yong Wang, Yijiao Zhao
This study's aim was to develop and validate an approach to automatically extract and reconstruct three-dimensional (3D) digital root models from in vivo teeth based on the anatomical characteristics of the periodontal ligament using cone beam computed tomography (CBCT) data. Prior to undergoing dental extractions for orthodontic purposes, the CBCT data of each study participant were collected and imported into Mimics software to reconstruct 3D in vivo digital root models (test models). Twenty roots of 17 teeth extracted from the study's participants were scanned using a dental scanner to obtain 3D in vitro digital root models (reference models)...
January 10, 2018: Scientific Reports
Ting-Mao Sun, Ting-Hsun Lan, Chin-Yun Pan, Huey-Er Lee
No study has investigated the effect of learning curves on the accuracy of dental implant navigation systems. This study evaluated the accuracy of the dental implant navigation system and established the learning curve according to operation site and operating time. Each dental model was used for drilling 3 missing tooth positions, and a patient tracking module was created. The same dentist performed the drilling test for 5 sets of dental models. CT back scanning was performed on the dental models. Customized implants based on the drilled holes were inserted...
January 2018: Kaohsiung Journal of Medical Sciences
Xiaozhen Lin, Yi Sun, Xiaodong Han, Jing Wang, Ming Zhang, Limin Liang
The authors aimed to test the hypothesis that in orthognathic surgery the maxilla could be repositioned using spatial distances from Glabella to 3 maxillary dental landmarks as references. An asymmetric skeletal Class 3 malocclusion patient was involved and bimaxillary orthognathic surgery was planned. Virtual surgery was simulated and spatial distances from Glabella to midpoint of the upper dentition (U0) and bilateral medial-buccal cusp of the first molar (6L and 6R) were measured. These distances were used as the repositioning references and were imported intraoperatively into a digital caliper after the maxilla was mobilized, the repositioning of maxilla was manipulated till all the true spatial distances reached the references...
January 2018: Journal of Craniofacial Surgery
Mohd Yusmiaidil Putera Mohd Yusof, Nur Liyana Abdul Rahman, Amiza Aqiela Ahmad Asri, Noor Ilyani Othman, Ilham Wan Mokhtar
Purpose: This study was performed to quantify the repeat rate of imaging acquisitions based on different clinical examinations, and to assess the prevalence of error types in intraoral bitewing and periapical imaging using a digital complementary metal-oxide-semiconductor (CMOS) intraoral sensor. Materials and Methods: A total of 8,030 intraoral images were retrospectively collected from 3 groups of undergraduate clinical dental students. The type of examination, stage of the procedure, and reasons for repetition were analysed and recorded...
December 2017: Imaging Science in Dentistry
Amir H Abdi, Alan G Hannam, Ian K Stavness, Sidney Fels
Some of the jaw tracking methods may be limited in terms of their accuracy or clinical applicability. This article introduces the sphere-based registration method to minimize the fiducial (reference landmark) localization error (FLE) in tracking and coregistration of physical and virtual dental models, to enable an effective clinical analysis of the patient's masticatory functions. In this method, spheres (registration fiducials) are placed on the corresponding polygonal concavities of the physical and virtual dental models based on the geometrical principle that establishes a unique spatial position for a sphere inside an infinite trihedron...
December 15, 2017: Journal of Biomechanics
Kasper Stokbro, Torben Thygesen
PURPOSE: In orthognathic surgery, the repeatability of 3-dimensional (3D) measurements is limited by the need for manual reidentification of reference points, which can incorporate errors greater than 1 mm for every 4 repeated measurements. This report describes a semiautomatic approach to decrease the manual reidentification error. This study evaluated the repeatability of surgical outcome measurements using the semiautomatic approach. Furthermore, a step-by-step guide is provided to enable researchers and clinicians to perform the 3D analysis by themselves...
November 22, 2017: Journal of Oral and Maxillofacial Surgery
Sophia Hui Xin Yee, Roxanna Jean Esguerra, Amelia Anya Qin'An Chew, Keng Mun Wong, Keson Beng Choon Tan
PURPOSE: To evaluate the 3D static articulation accuracy of 3 model scanner-CAD systems (Ceramill Map400 [AG], inEos X5 [SIR], Scanner S600 Arti [ZKN]) using a coordinate measuring machine (CMM). Trueness and precision for each system will be reported in Part I. MATERIALS AND METHODS: The master model simulated a single crown opposing a 3-unit fixed dental prosthesis. Five mounted stone cast sets were prepared, and one set was randomly selected. Reference values were obtained by measuring interarch and interocclusal reference features with the CMM...
December 13, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
Wen Luo, Mojgan Naeeni, Suzanne Platten, Jinfang Wang, Jianing N Sun, Stephen Westland, Andrew Joiner
OBJECTIVES: To assess the robustness of a new custom built video-based digital imaging system (VDIS) for measuring tooth colour and whiteness under in vitro and in vivo conditions. METHODS: The VDIS imaging system was developed for tooth colour measurement and evaluated in vitro and in vivo. The in vitro validation used extracted human teeth (HT, n=14) stored in water and VITA Classical shade guide tabs (SG, n=16). These were measured by the VDIS at baseline, 5min, 2h, 1 week and 2 weeks to evaluate the system repeatability...
December 2017: Journal of Dentistry
Selina H Somji, Agnetha Valladares, Sun Ho Kim, Yung Cheng Paul Yu, Stuart J Froum
Sinus augmentation is a predictable procedure that is often required when restoring the posterior maxilla with dental implants. Even with high success rates, careful pre-surgical planning is crucial. A 3D model is a valuable aid for the clinician as it allows for pre-operative simulation, which can reduce surgical time, reduce the risk of intra-operative complications and decrease the potential for error. The aim of this case report is to focus on how such a model is useful when undertaking a sinus augmentation procedure with simultaneous implant placement...
December 2017: Singapore Dental Journal
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