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Dental crowns

James Dudley
PURPOSE: The aim of this study was to quantify the coronal tooth structure reductions (CTSRs) resulting from a variety of different types of crown preparations performed by undergraduate dental students in a simulation clinic teaching program. MATERIALS AND METHODS: A total of 76 students each submitted 21 different crown preparations completed on typodont teeth, which were individually weighed and analyzed in relation to whole and sectioned reference teeth to calculate the CTSR resulting from each preparation...
February 15, 2018: International Journal of Prosthodontics
Ahmad Al Jaghsi, Reiner Biffar, Christiane Pink, Torsten Mundt
PURPOSE: To demonstrate how data collected using the computerized planimetric method (CPM) can be analyzed by providing an example in which the amount of plaque accumulation and the efficacy of the rotating needles device (RND) in cleaning specific parts of partial removable dental prostheses (PRDPs) were estimated. MATERIALS AND METHODS: Thirty-four participants wearing a total of 41 double-crown-retained PRDPs with veneered secondary crowns were included in this study...
February 15, 2018: International Journal of Prosthodontics
Cimara Fortes Ferreira, Mohamed Amer Shafter, Vinay Jain, Russel Anthony Wicks, Erno Linder, Carlos Alberto da Silva Ledo
BACKGROUND: Extruded cement during dental implant crown cementation may cause peri-implant diseases if not removed adequately. AIM: Evaluate the efficiency of removal of cement after cementation of implant crowns using an experimental "circular crisscross flossing technique (CCCFT) flossing technique, compared to the conventional "C" shape flossing technique (CSFT). MATERIAL AND METHODS: Twenty-four patients rendered 29 experimental and 29 control crowns...
February 13, 2018: Journal of Oral Implantology
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
Mario Beretta, Pier Paolo Poli, Sebastian Tansella, Carlo Maiorana
Insufficient crown height space, particularly in the interforaminal region of edentulous ridges with knife-edge morphology, may prevent successful prosthetic rehabilitation. Such conditions require osteoplasty, which might complicate computer-guided implant placement. This clinical report illustrates the treatment of a patient with complete edentulism rehabilitated with a mandibular implant-supported fixed dental prosthesis by using a virtually guided approach. Both alveolar ridge reduction and prosthetically driven implant insertions were computer-guided by surgical stents to increase accuracy and predictability...
February 8, 2018: Journal of Prosthetic Dentistry
Hester Hanegraef, María Martinón-Torres, Marina Martínez de Pinillos, Laura Martín-Francés, Amélie Vialet, Juan Luis Arsuaga, José María Bermúdez de Castro
OBJECTIVES: This study aims to explore the affinities of the Sima de los Huesos (SH) population in relation to Homo neanderthalensis, Arago, and early and contemporary Homo sapiens. By characterizing SH intra-population variation, we test current models to explain the Neanderthal origins. MATERIALS AND METHODS: Three-dimensional reconstructions of dentine surfaces of lower first and second molars were produced by micro-computed tomography. Landmarks and sliding semilandmarks were subjected to generalized Procrustes analysis and principal components analysis...
February 8, 2018: American Journal of Physical Anthropology
Helder Gomes Rodrigues, Raphaël Cornette, Julien Clavel, Guillermo Cassini, Bhart-Anjan S Bhullar, Marcos Fernández-Monescillo, Karen Moreno, Anthony Herrel, Guillaume Billet
Understanding the mechanisms responsible for phenotypic diversification, and the associated underlying constraints and ecological factors represents a central issue in evolutionary biology. Mammals present a wide variety of sizes and shapes, and are characterized by a high number of morphological convergences that are hypothesized to reflect similar environmental pressures. Extinct South American notoungulates evolved in isolation from northern mammalian faunas in highly disparate environments. They present a wide array of skeletal phenotypes and convergences, such as ever-growing dentition...
January 2018: Royal Society Open Science
Sadia Nasrin, Noriko Katsube, Robert R Seghi, Stanislav I Rokhlin
OBJECTIVES: The objective is to establish an approximate relative fatigue life estimation method under simulated mastication load for thin-walled monolithic restorations. METHODS: Experimentally measured fatigue parameters of fluormica, leucite, lithium disilicate and yttrium-stabilized zirconia in the existing literature were expressed in terms of the maximum cyclic stress and stress corresponding to initial crack size prior to N number of loading cycles to assess their differences...
February 2, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
Anne Duong, James Dudley
BACKGROUND: There is limited information regarding the profile and outcomes of implant treatment provided in the Australian public sector. This retrospective cohort study reviewed dental implant treatment completed at the Adelaide Dental Hospital over a 20 year period. METHODS: The database of implant treatment completed between 1996 and 2015 was analysed for patient, implant, prosthesis and operator specifics together with known implant status. RESULTS: Three hundred and twenty patients (mean age = 51...
February 3, 2018: Australian Dental Journal
R Pilo, M Folkman, A Arieli, S Levartovsky
The absolute marginal gap (AMG) precementation and postcementation and the retention of zirconia crowns cemented to standardized molar preparations (4×10) by self-adhesive resin cements (SARCs) were evaluated. The following SARCs were used: RelyX U-200 (RXU200; 3M ESPE, Seefeld, Germany), SmartCem 2 (SC2; Dentsply, Milford, DE, USA), and G-Cem Automix (GCA; GC, Alsip, IL, USA). The control adhesive resin cement was Panavia 21 (PAN; Kuraray Dental Co Ltd, Osaka, Japan). Twenty measuring locations at a constant interval along the margins were marked, and the AMG was measured by an image analysis system connected to a stereomicroscope (20×)...
February 2, 2018: Operative Dentistry
Song Xing, María Martinón-Torres, José María Bermúdez de Castro
This study provides new original data, including the endostructure of most Zhoukoudian H. erectus teeth preserved to date, since the publication of Black in 1927 and Weidenreich in 1937. The new evidence ratifies the similarities of Zhoukoudian with other East Asian mid-Middle Pleistocene hominins such as Hexian and Yiyuan, and allows defining a dental pattern potentially characteristic of this population commonly referred to as classic H. erectus. Given the possible chronological overlaps of classic H. erectus with other archaic Homo, the characterization of this group becomes a key issue when deciphering the taxonomy and evolutionary scenario of the Middle Pleistocene hominins in East Asia...
February 1, 2018: Scientific Reports
Mojtaba Mahmoudi, Ali Reza Saidi, Maryam Alsadat Hashemipour, Parviz Amini
In post-core crown restorations, the significant mismatch between stiffness of artificial crowns and dental tissues leads to stress concentration at the interfaces. The aim of the present study was to reduce the destructive stresses by using a class of inhomogeneous materials called functionally graded materials (FGMs). For the purpose of the study, a 3-dimentional computer model of a premolar tooth and its surrounding tissues were generated. A post-core crown restoration with various crown materials, homogenous and FGM materials, were simulated and analyzed by finite element method...
February 1, 2018: Computer Methods in Biomechanics and Biomedical Engineering
Fidele Nabbout, Pascal Baron
Aims and Objectives: The objective of this article is to focus on the dental anatomy, its influence on therapeutic choices, and decision in orthodontics. Materials and Methods: A sample of 80 subjects was selected and analyzed. Through the usage of the three-dimensional scanner with the C2000-Cepha and Cepha3DT software, it is now possible to calculate the volume and the dimensions of both crown and root of each tooth and compare them to the literature. Data were collected and statistically evaluated with the StatView software (version 5...
November 2017: Journal of International Society of Preventive & Community Dentistry
Gianfranco Cesaretti, Niklaus P Lang, Paolo Viganò, Franco Bengazi, Karol Alí Apaza Alccayhuaman, Daniele Botticelli
OBJECTIVE: To evaluate presumptive differences in osseointegration at implants supporting crowns that are physiologically loaded either immediately or 3 months after installation. MATERIAL AND METHODS: All premolars and first molars were extracted bilaterally in six dogs. After 3 months of healing, three implants were installed in the premolar region and two in the molar region in one side of the mandible. Likewise, after another 3 months, five implants were installed in the contralateral side, and impressions were taken bilaterally...
January 31, 2018: Journal of Oral Rehabilitation
Frank A Lopez, Michael Burton
No abstract text is available yet for this article.
February 1, 2018: Journal of the American Osteopathic Association
Kim Kniha, Karl Andreas Schlegel, Heinz Kniha, Ali Modabber, Friedrich Neukam, Kristian Kniha
PURPOSE: Soft tissue interactions with ceramic dental implants have previously been shown to have favorable esthetic outcomes. This study aimed to evaluate the papilla-crown proportion around zirconia implants in a 3-year follow-up study and the correlation between the gingival biotype and changes in papillary height. MATERIALS AND METHODS: This was a prospective study of 39 patients with 40 single-gap implants (Straumann PURE Ceramic ZLA Implant). The papilla-crown proportion was assessed after 3 months, 1 year, and 3 years...
January 28, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
Abdullah A Meshni, Mohammed M Al Moaleem, Khurshid A Mattoo, Esam Halboub, Saleh Mh Alharisi, Ali E Shatifi, Saeed A Al Amriee, Nabiel Al Ghazali
AIM: Post and core procedures are important clinical methods in routine dental practice. The present research aimed to radiographically assess the quality of post seating performed by undergraduate students at the College of Dentistry, Jazan University. MATERIALS AND METHODS: A total of 343 periapical X-rays of cemented posts (170 from males and 173 from females) were assessed. The assessment covered tooth type, arch, gender, type of post, length of post in relation to the crown and root lengths, the presence of any abnormality in post space, status of the remaining gutta-percha (GP), and the presence or absence of spaces between the end of post and GP...
January 1, 2018: Journal of Contemporary Dental Practice
Jessica A Yesensky, Rifat Hasina, Kristen E Wroblewski, Joseph Bellairs, Zhen Gooi, Vassiliki Saloura, Nicole A Cipriani, Everett E Vokes, Louis G Portugal, Tanguy Y Seiwert, Elizabeth D Blair, Nishant Agrawal
BACKGROUND: Oral cavity squamous cell carcinoma (SCC) arising in nonsmokers and nondrinkers remains poorly characterized. We hypothesized that these patients had prior exposure to metallic dental hardware. METHODS: We utilized a questionnaire querying the lifetime oral health status of 54 patients. Demographics and extensive oral health history were collected. RESULTS: The majority of patients (74%) had prior exposure to metallic dental hardware...
January 22, 2018: Head & Neck
J A Horst
Medical management of caries is a distinct treatment philosophy that employs topical minimally invasive therapies that treat the disease and is not merely prevention. This strategy is justified as an alternative or supplement to traditional care by significant disease recurrence rates following comprehensive operative treatment under general anesthesia. Silver diamine fluoride (SDF) is one agent to enable effective noninvasive treatment. The announcement of breakthrough therapy designation by the Food and Drug Administration (FDA) suggests that SDF may become the first FDA-approved drug for treating caries...
February 2018: Advances in Dental Research
João Malta Barbosa, Daniel Navarro da Rocha, Ronaldo Hirata, Gileade Freitas, Estevam A Bonfante, Paulo G Coelho
PURPOSE: To evaluate the probability of survival and failure modes of different external hexagon connection systems restored with anterior cement-retained single-unit crowns. The postulated null hypothesis was that there would be no differences under accelerated life testing. MATERIALS AND METHODS: Fifty-four external hexagon dental implants (∼4 mm diameter) were used for single cement-retained crown replacement and divided into 3 groups: (3i) Full OSSEOTITE, Biomet 3i (n = 18); (OL) OEX P4, Osseolife Implants (n = 18); and (IL) Unihex, Intra-Lock International (n = 18)...
January 17, 2018: Implant Dentistry
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