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https://www.readbyqxmd.com/read/29779288/-advances-in-surgical-techniques-of-periodontal-corticotomy
#1
Si-Yu Wang, Zhen-Dong Wang, Bin Yan
The number of adults seeking orthodontic treatment is increasing. Shortening the course of orthodontic treatment has become a research hotspot in recent years. Methods of accelerating tooth movement have been reported. Theoretical and clinical studies have confirmed that periodontal corticotomy is effective in accelerating tooth movement and increasing osteogenic potential. Many surgical techniques of periodontal corticotomy have been developed. This review summarizes the history of periodontal corticotomy and the development of the surgical techniques in recent years, thereby providing references for the clinical application of corticotomy...
April 1, 2018: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/29771300/evaluation-of-orthodontically-induced-external-root-resorption-following-orthodontic-treatment-using-cone-beam-computed-tomography-cbct-a-systematic-review-and-meta-analysis
#2
Aikaterini Samandara, Spyridon N Papageorgiou, Ioulia Ioannidou-Marathiotou, Smaragda Kavvadia-Tsatala, Moschos A Papadopoulos
Background: Orthodontically induced external root resorption (OIRR) is a pathologic consequence of orthodontic tooth movement. However, the limitations of two-dimensional radiography suggest that cone beam computed tomography (CBCT) with its three-dimensional capabilities might be more suitable to assess OIRR. Objective: The aim of this study was to assess in an evidence-based manner data on linear or volumetric OIRR measurements of permanent teeth by means of CBCT, during and/or after the end of orthodontic treatment...
May 15, 2018: European Journal of Orthodontics
https://www.readbyqxmd.com/read/29765918/comparative-tomographic-study-of-the-maxillary-central-incisor-collum-angle-between-class-i-class-ii-division-1-and-2-patients
#3
Murilo Fernando Neuppmann Feres, Bianca Santana Rozolen, Adel Alhadlaq, Thamer A Alkhadra, Tarek El-Bialy
INTRODUCTION: It has been reported that Class II, division 2 maxillary central incisors frequently demonstrate increased collum angles, which indicates an excessive palatal "bend" of the crown. However, evidence supporting such observation is mostly derived from radiographic studies. OBJECTIVE: The objective of this study was to evaluate and compare the collum angle of maxillary central incisors in Class I, Class II, division 1, and Class II, division 2 cases using cone-beam computed tomography...
2018: Journal of Orthodontic Science
https://www.readbyqxmd.com/read/29761497/vibration-enhances-pge-2-il-6-and-il-8-expression-in-compressed-hpdl-cells-via-cyclooxygenase-pathway
#4
Pussadee Phusuntornsakul, Suwanna Jitpukdeebodintra, Prasit Pavasant, Chidchanok Leethanakul
BACKGROUND: Although vibration combined with orthodontic force may accelerate orthodontic tooth movement, little is known about the mechanisms that regulate the associated cellular responses. The propose of this study was to investigate whether mechanical vibration combined with compressive force regulates COX-2/PGE2 , IL-6 and IL-8 mRNA and protein expression in human periodontal ligament (hPDL) cells via the cyclooxygenase pathway. METHODS: The primary cultured hPDL cells were exposed to mechanical vibration, compressive force or a combination of both mechanical vibration and compressive force at 24, 48, 72 h...
May 14, 2018: Journal of Periodontology
https://www.readbyqxmd.com/read/29746360/laxative-induced-contact-dermatitis
#5
Jennifer E Melvin, Robert W Hickey
A 5-year-old female with Charcot-Marie-Tooth neuropathy and a history of constipation presented to the emergency department with a new blistering buttocks rash, which was initially concerning for nonaccidental burn. Upon further investigation, it was found that Ex-Lax had been given to the patient for constipation. This had resulted in a bowel movement, which led to an irritant dermatitis. The patient was eventually diagnosed with senna-induced erosive diaper dermatitis. This case report highlights the importance of a thorough history and physical examination to prevent an unnecessary child abuse work-up...
May 9, 2018: Pediatric Emergency Care
https://www.readbyqxmd.com/read/29745813/pleiotropic-function-of-dlx3-in-amelogenesis-from-regulating-ph-and-keratin-expression-to-controlling-enamel-rod-decussation
#6
Olivier Duverger, Maria I Morasso
DLX3 is essential for tooth enamel development and is so far the only transcription factor known to be mutated in a syndromic form of amelogenesis imperfecta. Through conditional deletion of Dlx3 in the dental epithelium in mouse, we have previously established the involvement of DLX3 in enamel pH regulation, as well as in controlling the expression of sets of keratins that contribute to enamel rod sheath formation. Here, we show that the decussation pattern of enamel rods was lost in conditional knockout animals, suggesting that DLX3 controls the coordinated migration of ameloblasts during enamel secretion...
December 2018: Connective Tissue Research
https://www.readbyqxmd.com/read/29743384/temporal-change-in-the-occlusal-vertical-dimension-and-its-involvement-in-modulation-of-jaw-movement-in-bite-reduced-animals
#7
Hiroshi Matoba, Hayato Kanayama, Takafumi Kato, Mohammad Z Hossain, Junichi Kitagawa, Yoshie Takehana, Kazuhiro Yamada, Yuji Masuda
The occlusal vertical dimension (OVD) in guinea pigs is maintained by tooth eruption and grinding. It has been reported that the experimentally raised OVD recovers to the innate OVD within a few days in guinea pigs. However, the mechanisms underlying OVD adjustment are not entirely understood. This study thus aimed to clarify whether the experimentally reduced OVD would recover. Bite-reduced guinea pigs were created by applying bilateral intermaxillary elastics for 10 days. Guinea pigs without elastics were used as a control...
May 10, 2018: Journal of Oral Science
https://www.readbyqxmd.com/read/29734391/vibration-paradox-in-orthodontics-anabolic-and-catabolic-effects
#8
Mani Alikhani, Sarah Alansari, Mohammad A Hamidaddin, Chinapa Sangsuwon, Bandar Alyami, Soumya N Thirumoorthy, Serafim M Oliveira, Jeanne M Nervina, Cristina C Teixeira
Vibration in the form of High Frequency Acceleration (HFA) is anabolic on the craniofacial skeleton in the absence of inflammation. Orthodontic forces trigger an inflammation-dependent catabolic cascade that is crucial for tooth movement. It is unknown what effect HFA has on alveolar bone if applied during orthodontic treatment. The objectives of this study are to examine the effect of HFA on the rate of tooth movement and alveolar bone, and determine the mechanism by which HFA affects tooth movement. Adult Sprague Dawley rats were divided to control, orthodontic force alone (OTM), and different experimental groups that received the same orthodontic forces and different HFA regimens...
2018: PloS One
https://www.readbyqxmd.com/read/29732306/the-effectiveness-of-corticotomy-and-piezocision-on-canine-retraction-a-systematic-review
#9
REVIEW
Nita Viwattanatipa, Satadarun Charnchairerk
The aim of this systematic review was to evaluate the effectiveness and complications of corticotomy and piezocision in canine retraction. Five electronic databases (PubMed, SCOPUS, Web of Science, Embase, and CENTRAL) were searched for articles published up to July 2017. The databases were searched for randomized control trials (RCTs), with a split-mouth design, using either corticotomy or piezocision. The primary outcome reported for canine retraction was either the amount of tooth movement, rate of tooth movement, or treatment time...
May 2018: Korean Journal of Orthodontics
https://www.readbyqxmd.com/read/29732305/cone-beam-computed-tomography-based-diagnosis-and-treatment-simulation-for-a-patient-with-a-protrusive-profile-and-a-gummy-smile
#10
Shunsuke Uesugi, Toshihiro Imamura, Satoshi Kokai, Takashi Ono
For patients with bimaxillary protrusion, significant retraction and intrusion of the anterior teeth are sometimes essential to improve the facial profile. However, severe root resorption of the maxillary incisors occasionally occurs after treatment because of various factors. For instance, it has been reported that approximation or invasion of the incisive canal by the anterior tooth roots during retraction may cause apical root damage. Thus, determination of the position of the maxillary incisors is key for orthodontic diagnosis and treatment planning in such cases...
May 2018: Korean Journal of Orthodontics
https://www.readbyqxmd.com/read/29730290/cystathionine-gamma-lyase-h-2-s-contributes-to-osteoclastogenesis-during-bone-remodeling-induced-by-mechanical-loading
#11
Shenzheng Mo, Yongmei Hua
Hydrogen sulfide (H2 S), a gaseous signaling molecule produced by cystathionine γ-lyase (CSE) and cystathionine β-synthase (CBS), influences bone remodeling in many ways. Osteoclasts play an important role in bone remodeling during tooth movement induced by mechanical loading, which increases the rate of tooth movement. Recently, we found that osteoclasts could produce H2 S. However, whether H2 S modulates bone remodeling by affecting osteoclasts remains unclear. In this study, we found that CSE-H2 S was a dominant H2 S generating system in osteoclasts, while CBS did not generate H2 S...
May 3, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29729043/intra-and-inter-tooth-variation-in-strontium-isotope-ratios-from-prehistoric-seals-by-laser-ablation-la-mc-icp-ms
#12
A Glykou, G Eriksson, J Storå, M Schmitt, E Kooijman, K Lidén
RATIONALE: Strontium isotope ratios (87 Sr/86 Sr) in modern-day marine environments are considered to be homogeneous (~0.7092). However, in the Baltic Sea, the Sr ratios are controlled by mixing seawater and continental drainage from major rivers discharging into the Baltic. This pilot study explores if variations in Sr can be detected in marine mammals from archaeological sites in the Baltic Sea. METHODS: 87 Sr/86 Sr ratios were measured in tooth enamel from three seal species by laser ablation (LA)-MC-ICP-MS...
May 4, 2018: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/29728549/an-evaluation-of-mandibular-dental-and-basal-arch-dimensions-in-class-i-and-class-ii-division-1-adult-syrian-patients-using-cone-beam-computed-tomography
#13
Layal H Al-Hilal, Kinda Sultan, Mohammad Y Hajeer, Ghiath Mahmoud, Abdulrahman A Wanli
Aim: The aim of this study is (1) to inspect any difference in mandibular arch widths between males and females in class I and class II division 1 (class malocclusions using cone-beam computed tomography (CBCT), (2) to compare the mandibular dental and basal widths between the two groups, and (3) to investigate any possible correlation between dental and basal arch widths in both groups. Materials and methods: The CBCT images of 68 patients aged between 18 and 25 years consisted of 34 class I (17 males and 17 females) and 34 class (17 males and 17 females) who were recruited at the Department of Orthodontics, University of Damascus Dental School (Syria)...
April 1, 2018: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/29720661/earliest-known-hominin-activity-in-the-philippines-by-709-thousand-years-ago
#14
T Ingicco, G D van den Bergh, C Jago-On, J-J Bahain, M G Chacón, N Amano, H Forestier, C King, K Manalo, S Nomade, A Pereira, M C Reyes, A-M Sémah, Q Shao, P Voinchet, C Falguères, P C H Albers, M Lising, G Lyras, D Yurnaldi, P Rochette, A Bautista, J de Vos
Over 60 years ago, stone tools and remains of megafauna were discovered on the Southeast Asian islands of Flores, Sulawesi and Luzon, and a Middle Pleistocene colonization by Homo erectus was initially proposed to have occurred on these islands1-4 . However, until the discovery of Homo floresiensis in 2003, claims of the presence of archaic hominins on Wallacean islands were hypothetical owing to the absence of in situ fossils and/or stone artefacts that were excavated from well-documented stratigraphic contexts, or because secure numerical dating methods of these sites were lacking...
May 2, 2018: Nature
https://www.readbyqxmd.com/read/29720325/histological-evaluation-of-periodontal-ligament-in-human-after-orthodontic-treatment-with-piezosurgery-and-monolateral-tooth-dislocation-and-ligament-distraction-technique-a-first-morphologic-and-histologic-evaluation
#15
D Bertossi, P F Galzignato, G Conti, U Luciano, A Gualdi, C Corega, P Faccioni, D Donadello, L Lanaro, E Grendene, A Sbarbati, D De Santis, R Nocini, P F Nocini
Traditional orthodontic tooth movement is based on the concept that application of a protracted force causes alveolar bone remodelling and adaptive changes in periodontal and dental tissues. Thus, if orthodontic tooth movement is described as a biological bone reaction to orthodontic forces mediated by the periodontal ligament (PDL), this event involves a series of sophisticated signal transduction processes that allows the PDL compression with specific histologic and biomolecular modifications. However, the preservation of the integrity of the PDL is generally difficult to achieve when it is associated with a long duration of orthodontic treatment...
March 2018: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/29714068/effects-of-different-force-magnitudes-on-corticotomy-assisted-orthodontic-tooth-movement-in-rats
#16
Kriangkrai Kraiwattanapong, Bancha Samruajbenjakun
OBJECTIVES: To investigate the effects of light and heavy forces with corticotomy on tooth movement rate, alveolar bone response, and root resorption in a rat model. MATERIALS AND METHODS: The right and left sides of 40 male Wistar rats were randomly assigned using the split-mouth design to two groups: light force with corticotomy (LF) and heavy force with corticotomy (HF). Tooth movement was performed on the maxillary first molars using a nickel-titanium closed-coil spring delivering either 10 g (light force) or 50 g (heavy force)...
May 1, 2018: Angle Orthodontist
https://www.readbyqxmd.com/read/29706515/puncture-and-pull-biomechanics-in-the-teeth-of-predatory-coelurosaurian-dinosaurs
#17
Angelica Torices, Ryan Wilkinson, Victoria M Arbour, Jose Ignacio Ruiz-Omeñaca, Philip J Currie
The teeth of putatively carnivorous dinosaurs are often blade-shaped with well-defined serrated cutting edges (Figure 1). These ziphodont teeth are often easily differentiated based on the morphology and density of the denticles [1, 2]. A tearing function has been proposed for theropod denticles in general [3], but the functional significance of denticle phenotypic variation has received less attention. In particular, the unusual hooked denticles found in troodontids suggest a different feeding strategy or diet compared to other small theropods...
April 23, 2018: Current Biology: CB
https://www.readbyqxmd.com/read/29706215/longitudinal-eruptive-and-posteruptive-tooth-movements-studied-on-oblique-and-lateral-cephalograms-with-implants
#18
Xiaoyun Zhang, Sheldon Baumrind, Gui Chen, Huizhong Chen, Yi Liang, Tianmin Xu
INTRODUCTION: The purpose of this study was to investigate the eruptive and posteruptive tooth displacements of untreated growing subjects longitudinally and the potential connections between posteruptive displacement of the maxillary and mandibular first molars and skeletal facial growth. METHODS: The sample comprised 11 series of right 45° oblique cephalograms and lateral cephalograms of untreated children with metallic implants of the Björk type obtained from the archives of a growth study...
May 2018: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/29706213/influence-of-orthodontic-mini-implant-penetration-of-the-maxillary-sinus-in-the-infrazygomatic-crest-region
#19
Xueting Jia, Xing Chen, Xiaofeng Huang
INTRODUCTION: Mini-implants are widely used for predictable tooth movements, but insertion is often restricted by anatomic structures. The aims of this study were to investigate the incidence of penetration of mini-implants into the sinus and the relationship between penetration depth and sinus tissue. METHODS: Data from 32 patients who received mini-implants in the infrazygomatic crest were collected from a data base. The success rate of mini-implants was determined by clinical retrospective analysis...
May 2018: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/29706211/age-dependent-biologic-response-to-orthodontic-forces
#20
Mani Alikhani, Michelle Y Chou, Edmund Khoo, Sarah Alansari, Rachel Kwal, Tali Elfersi, Abdullah Almansour, Chinapa Sangsuwon, Mohammed Al Jearah, Jeanne M Nervina, Cristina C Teixeira
INTRODUCTION: Orthodontic tooth movement results from increased inflammation and osteoclast activation. Since patients of all ages now routinely seek orthodontics treatment, we investigated whether age-dependent biologic responses to orthodontic force correlate with the rate of tooth movement. METHODS: We studied 18 healthy subjects, adolescents (11-14 years) and adults (21-45 years), with Class II Division 1 malocclusion requiring 4 first premolar extractions...
May 2018: American Journal of Orthodontics and Dentofacial Orthopedics
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