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Dental occlusion

Bernd Zimmer, Hiba Sino
PURPOSE: The objective of this investigation was to develop equations to describe the geometric relations among "targeted incisor inclinations" (tU1, tL1) accommodating different cephalometric norms (Ricketts, Bergen, etc.) with the "expected inclinations" (eU1, eL1), as they can be generated by bracket torque values according to Andrews, Roth, Ricketts, and MBT. METHODS: In its key parts, the present study is a theoretical work in which structural relationships are described using standard mathematical and geometric methodologies...
March 15, 2018: Journal of Orofacial Orthopedics, Fortschritte der Kieferorthopädie
Bruno Tochetto Primo, Leonardo Marcos Mezzari, Luís Carlos da Fontoura Frasca, Raquel Linderman, Elken Gomes Rivaldo
PURPOSE: To evaluate and compare the clinical and radiographic outcomes of mandibular rehabilitation with fixed prostheses on three implants with immediate versus delayed loading. MATERIALS AND METHODS: The sample comprised 21 patients who underwent treatment with immediate loading and 23 who received delayed loading. All had worn their prostheses for at least 18 months. Radiographic evaluation of bone loss was carried out in Adobe Photoshop CS5 by a single calibrated examiner using digitized panoramic radiographs...
March 15, 2018: International Journal of Oral & Maxillofacial Implants
H Andersson, L Sonnesen
AIMS: This was to compare sleepiness, occlusion, dental arch and palatal dimensions between children with attention deficit hyperactivity disorders (ADHD) and healthy children (control group). METHODS: 15 children with ADHD (10 boys, 5 girls, mean age 10.98 years) and 36 healthy age matched children (21 boys, 15 girls, mean age 10.60 years) were included. Intra-oral three-dimensional scans of the teeth and palate were performed to evaluate the occlusion, dental arch and palatal dimensions...
March 14, 2018: European Archives of Paediatric Dentistry: Official Journal of the European Academy of Paediatric Dentistry
Dauro Douglas Oliveira, Bruno Franco de Oliveira, Carolina Morsani Mordente, Gabriela Martins Godoy, Rodrigo Villamarim Soares, Paulo Isaías Seraidarian
The purpose of this paper is to present and discuss a simple and low-cost clinical approach to correct an asymmetric skeletal Class III combined to an extensive dental open bite that significantly compromised the occlusal function and smile aesthetics of an adult male patient. The patient did not accept the idealistic surgical-orthodontic treatment option, neither the use of temporary anchorage devices to facilitate the camouflage of the asymmetrical skeletal Class III/open bite. Therefore, a very simple and inexpensive biomechanical approach using sliding jigs in the mandibular arch was implemented as the compensatory treatment of the malocclusion...
March 12, 2018: Journal of Orthodontics
Woong Ki Kim, Sunjai Kim
STATEMENT OF PROBLEM: Because of their relatively small scanning area, intraoral scanners may result in less accurate fixed dental prostheses (FDPs) than do laboratory scanners. PURPOSE: The purpose of this in vitro study was to evaluate the accuracy of monolithic zirconia FDPs with different numbers of pontics fabricated with different impression techniques. MATERIAL AND METHODS: The mandibular right premolars and molars of an acrylic resin model were prepared to receive 4-unit FDPs...
March 8, 2018: Journal of Prosthetic Dentistry
Sergio Sambataro, Gabriele Cervino, Luca Fiorillo, Marco Cicciù
The present study aimed to find the proper distorotation of the upper first premolar to achieve the therapeutic ideal advocated for the stability of the human occlusion. Normal teeth were analyzed and occlusal photocopies of upper arch were made to perform the 2 measurements. The first parameter was the angle formed by the perpendicular to the wire through the buccal cusp and a line connecting the buccal and the lingual cusps of the upper first premolar. The second one was the angle from the buccal line and the sagittal plane of the model...
March 8, 2018: Journal of Craniofacial Surgery
Anas Imran Arshad, Mohammad Khursheed Alam, Mohammad Fadhli Khamis
OBJECTIVES: The aim of this study is to assess the treatment outcome of complete unilateral cleft lip and palate (CUCLP) patients using modified Huddart/Bodenham scoring system (MHB). To determine whether there is an association of congenital and postnatal factors with the treatment outcome. DESIGN: Retrospective observational study. SETTING: Two regional cleft-referral centers. MAIN OUTCOME MEASURES: In the current study, 101 pairs of dental models of non-syndromic CUCLP patients were retrieved from hospital archives...
January 1, 2018: Cleft Palate-craniofacial Journal
K H Bendixen, H Gjørup, L Baad-Hansen, J Dahl Hald, T Harsløf, M H Schmidt, B L Langdahl, D Haubek
BACKGROUND: Osteogenesis Imperfecta (OI) is characterized by a number of deviations in the orofacial region. The aims of the present study were to investigate the occurrence of temporomandibular disorders, to evaluate the psychosocial status, and to assess the dental occlusion in a population of adult OI patients. METHODS: Participants (n = 75) were classified with mild OI, type I (n = 56), or moderate-severe OI, type III and IV (n = 19). OI patients were examined according to the Research Diagnostic Criteria for Temporomandibular Disorders (axis I and II)...
March 7, 2018: BMC Oral Health
Marília Leão Goettems, Mariana Ourens, Laura Cosetti, Susana Lorenzo, Ramon Álvarez-Vaz, Roger Keller Celeste
This study aims to estimate orthodontic treatment need among 15-24 year-old individuals in Montevideo, Uruguay, and the association of occlusal traits with demographic, clinical and socioeconomic factors, considering a life course approach. A cross-sectional study using data from the First National Oral Health Survey in Uruguay was conducted. A two-stage cluster procedure was used to select a sample of 278 individuals in Montevideo. Household interviews and oral examinations were performed by six dentists. Dental Aesthetic (DAI) and Decayed Missing and Filled Teeth Indices (DMFT) were used to assess orthodontic treatment need and dental caries, respectively...
March 5, 2018: Cadernos de Saúde Pública
M Eichenberger, N Biner, M Amato, A Lussi, P Perrin
OBJECTIVES: To evaluate the impact of magnification aids on the precision of tooth preparation under simulated clinical conditions. METHODS AND MATERIALS: Two plastic blocks marked with a geometric shape were fixed in a dental phantom head: a circle as the distal surface of tooth 16 (UNS 3) and a y-shaped figure as the occlusal surface of tooth 36 (UNS 19). Sixteen dentists (mean age: 39 years; range: 26-67 years) prepared the geometric shapes from the inside to the boundary line with a cylindrical bur and water-cooling...
March 7, 2018: Operative Dentistry
Xuemei Zhang, Yinglian Zhou, Hulun Li, Rui Wang, Dan Yang, Bing Li, Jin Fu
Dental pulp stem cells (DPSCs) are considered as an ideal stem cell source for the treatment of neurological diseases. In this study, we evaluated the therapeutic potency of DPSCs and brain-derived neurotrophic factor (BDNF) in focal cerebral ischemia using animal models. Following middle cerebral artery occlusion (MCAO), rats were randomized into four groups: the BDNF, DPSCs, DPSCs+BDNF and the controls injected with saline. DPSCs were transplanted and BDNF was injected into the DPSCs+BDNF group via the tail vein...
February 28, 2018: International Journal of Molecular Medicine
Xiaoshan Wu, Lei Hu, Yan Li, Yang Li, Fu Wang, Ping Ma, Jinsong Wang, Chunmei Zhang, Canhua Jiang, Songlin Wang
The tooth root transmits and balances occlusal forces through the periodontium to the alveolar bone. The periodontium, including the gingiva, the periodontal ligament, the cementum and the partial alveolar bone, derives from the dental follicle (DF), except for the gingiva. In the early developmental stages, the DF surrounds the tooth germ as a sphere and functions to promote tooth eruption. However, the morphological dynamics and factors regulating the differentiation of the DF during root elongation remain largely unknown...
2018: International Journal of Medical Sciences
E Pollaris, M Haspeslagh, G Van den Wyngaert, L Vlaminck
BACKGROUND: Fissures of the occlusal surface of equine cheek teeth are commonly encountered during oral examination but their aetiology is unknown. OBJECTIVES: To examine the prevalence and characteristics of occlusal fissures in cadaver teeth. It is hypothesised that their prevalence is influenced by masticatory forces. Consequently, their possible association with wear disorders and occlusal angles were examined. STUDY DESIGN: Cross-sectional survey...
March 6, 2018: Equine Veterinary Journal
András Forster, Gábor Braunitzer, Máté Tóth, Balázs P Szabó, Márk Fráter
PURPOSE: Molar MOD (mesial-occlusal-distal) cavity preparation weakens relative cuspal stiffness by up to 63%, often resulting in cuspal fracture. This investigation inspects fracture resistance of MOD cavities restored using direct composite restoration. MATERIALS AND METHODS: 120 extracted, intact mandibular molars were selected. MOD cavities with different depth/wall thickness were prepared in 9 groups (n = 12): A: 3 mm/3.5 mm, B: 3 mm/2.5 mm, C: 3 mm/1.5 mm, D: 5 mm/3...
March 5, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
Yoko Yokoyama, Naoki Kakudate, Futoshi Sumida, Yuki Matsumoto, Valeria V Gordan, Gregg H Gilbert
We aimed to obtain greater understanding of dentists' distress when they diagnose and treat patients with temporomandibular disorders (TMD), and to explore ways in which TMD can be better treated.We conducted a cross-sectional study based on a questionnaire survey of dentists (n = 148). Dentists were queried using an open-ended questionnaire about distress they experienced when treating patients with TMD. Survey responses were analyzed using mixed methods. Associations between specific dentist and patient characteristics and types of distress were analyzed by one way analysis of variance and residual analysis...
January 2018: Medicine (Baltimore)
Philipp-Cornelius Pott, Michael Eisenburger, Meike Stiesch
PURPOSE: In literature, many studies compare survival rates of different types of FPDs. Most of them compared restorations, which originated from one university, but from different clinicians. Data about restoration survival rates by only one experienced dentist are very rare. The aim of this study was to evaluate the survival rate of allceramic FPDs without the blurring effects of different clinicians. MATERIALS AND METHODS: 153 veneeredzirconia FPDs were observed for follow-up...
February 2018: Journal of Advanced Prosthodontics
LiJun Sun, Hyeon-Shik Hwang, Kyung-Min Lee
INTRODUCTION: The purpose of this study was to examine changes in registration accuracy after including occlusal surface and incisal edge areas in addition to the buccal surface when integrating laser-scanned and maxillofacial cone-beam computed tomography (CBCT) dental images. METHODS: CBCT scans and maxillary dental casts were obtained from 30 patients. Three methods were used to integrate the images: R1, only the buccal and labial surfaces were used; R2, the incisal edges of the anterior teeth and the buccal and distal marginal ridges of the second molars were used; and R3, labial surfaces, including incisal edges of anterior teeth, and buccal surfaces, including buccal and distal marginal ridges of the second molars, were used...
March 2018: American Journal of Orthodontics and Dentofacial Orthopedics
Seyed Mostafa Mousavinasab, Mohammad Atai, Mehrdad Barekatain, Parisa Fattahi, Amir Fattahi, Vahid Rakhshan
Background: The aim of this study was to assess for the first time the effects of different amounts of ethanol solvent on the microtensile bond strength of composite bonded to dentin using a polyhedral oligomeric silsesquioxane (POSS)-incorporated adhesive. Materials and Methods: This experimental study was performed on 120 specimens divided into six groups (in accordance with the ISO TR11405 standard requiring at least 15 specimens per group). Occlusal dentin of thirty human molar teeth was exposed by removing its enamel...
January 2018: Dental Research Journal
Albert Ngo, Kenneth H Chan, Oanh Le, Jacob C Simon, Daniel Fried
Recent studies have shown that near-IR (NIR) imaging methods such as NIR reflectance can be used to image lesions on proximal surfaces, and optical coherence tomography (OCT) can be used to measure the depth of those lesions below the tooth surface. These imaging modalities can be used to acquire high contrast images of demineralized tooth surfaces, and 2-D and 3-D images can be extracted from this data. At NIR wavelengths longer than 1200-nm, there is no interference from stains and the contrast is only due to the increased light scattering of the demineralization...
January 2018: Proceedings of SPIE
Michèle Muller-Bolla, Fréderic Courson, Laurence Lupi-Pégurier, Corinne Tardieu, Shrisha Mohit, Pascal Staccini, Ana Miriam Velly
A split-mouth randomized clinical trial was carried out to assess the effectiveness of sealants in preventing carious ICDAS (International Caries Detection and Assessment System) 3-6 lesions within a 2-year follow-up. We evaluated the effectiveness of 2 types of resin-based sealants, with and without fluoride, their retention rates, and the caries risk factors related to their outcomes. The study included 663 tooth pairs in 400 children (aged 5-15 years) considered to be at high individual caries risk (ICR) and presenting permanent molars free of caries or affected by ICDAS 1-2 lesions...
March 1, 2018: Caries Research
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