The aim of the study was to apply an effective treatment protocol with low morbidity for children with syndromic and nonsyndromic micrognathia using curvilinear distractors, intraoral approach and early orthodontic treatment. We report 7 patients aged from 3 to 13 years with bilateral mandibular hypoplasia. These patients were characterized by severe malocclusion, esthetic facial deformation and respiratory disorders. In 3 patients mandibular hypoplasia was combined with anterior open bite. The intraoral surgical approach was used in all cases. Good functional and esthetic results were achieved during treatment. The less traumatic intraoral approach, curvilinear distractors, ultrasound callus formation control and early orthodontic treatment assure the good functional and esthetic results in severe cases facilitating the continuinty in complex rehabilitation of the growing child.
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http://dx.doi.org/10.17116/stomat201695237-47 | DOI Listing |
J Exp Psychol Gen
December 2024
Department of Cognitive Psychology, Institute of Psychology, Leiden University.
The U-shaped curve has long been recognized as a fundamental concept in psychological science, particularly in theories about motivational accounts and cognitive control. In this study ( = 330), we empirically tested the prediction of a nonmonotonic, curvilinear relationship between task difficulty and control adaptation. Drawing from motivational intensity theory and the expected value of control framework, we hypothesized that control intensity would increase with task difficulty until a maximum tolerable level, after which it would decrease.
View Article and Find Full Text PDFGeroscience
February 2024
Department of Psychology, Cornell University, Ithaca, NY, USA.
The cognitive aging process is not necessarily linear. Central task-evoked pupillary responses, representing a brainstem-pupil relationship, may vary across the lifespan. Thus we examined, in 75 adults ranging in age from 19 to 86, whether task-evoked pupillary responses to an attention task may serve in as an index of cognitive aging.
View Article and Find Full Text PDFJ Stomatol Oral Maxillofac Surg
February 2023
Department of Oral and Maxillofacial Surgery, Affiliated Stomatology Hospital of Guangzhou Medical University, Guangdong Engineering Research Center of Oral Restoration and Reconstruction, Guangzhou Key Laboratory of Basic and Applied Research of Oral Regenerative Medicine, NO.195-3 Dongfengxi Road, Guangzhou, Guangdong 510182, China. Electronic address:
Objectives: The semiburied design of the traditional internal distractor has a relatively high risk of infection and aesthetic problems. To reduce these potential risks, a modified internal distractor with design of pre-embedding curvilinear rail, drive screw, and universal joint was invented. Its stress distribution characteristics and the effect on curvilinear distraction osteogenesis (DO) in vivo were further tested.
View Article and Find Full Text PDFCleft Palate Craniofac J
July 2020
Bernard Sarnat Scholar of Craniofacial Research, Section of Plastic and Reconstructive Surgery, Department of Surgery, University of Chicago Medical Center, IL, USA.
Objective: To investigate airway morphology changes in patients with Pierre Robin sequence (PRS) pre-/post-mandibular distraction osteogenesis (MDO) and to compare morphologic changes to age-matched controls.
Design: Retrospective case-control study.
Setting: Urban, academic, tertiary medical center.
Ann Maxillofac Surg
January 2019
Department of Mechanical Engineering, University of Cape Town, Rondebosch, South Africa.
Background: Large surgical defects in the maxilla due to trauma or tumor are usually reconstructed with revascularized-free fibula flaps (RFFF). In the past, the use of curvilinear transport distraction osteogenesis (CTDO) has been shown to be an efficacious way in closing large defects in the maxilla, but it had limitations which have now been overcome by the present development. The present distractor is an improvement upon the previous three prototypes and employs the concept of tetrafocal distraction by means of hybridizing the bone with the tooth in the transport disc segment.
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