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https://www.readbyqxmd.com/read/29447759/ecomorphological-analysis-of-bovid-mandibles-from-laetoli-tanzania-using-3d-geometric-morphometrics-implications-for-hominin-paleoenvironmental-reconstruction
#1
Frances L Forrest, Thomas W Plummer, Ryan L Raaum
The current study describes a new method of mandibular ecological morphology (ecomorphology). Three-dimensional geometric morphometrics (3D GM) was used to quantify mandibular shape variation between extant bovids with different feeding preferences. Landmark data were subjected to generalized Procrustes analysis (GPA), principal components analysis (PCA), and discriminant function analysis (DFA). The PCA resulted in a continuum from grazers to browsers along PC1 and DFA classified 88% or more of the modern specimens to the correct feeding category...
January 2018: Journal of Human Evolution
https://www.readbyqxmd.com/read/29447757/using-the-covariation-of-extant-hominoid-upper-and-lower-jaws-to-predict-dental-arcades-of-extinct-hominins
#2
Stefanie Stelzer, Philipp Gunz, Simon Neubauer, Fred Spoor
Upper and lower jaws are well represented in the fossil record of mammals and are frequently used to diagnose species. Some hominin species are only known by either their maxillary or mandibular morphology, and in this study, we explore the possibility of predicting their complementary dental arcade shape to aid the recognition of conspecific specimens in the fossil record. To this end, we apply multiple multivariate regression to analyze 3D landmark coordinates collected on associated upper and lower dental arcades of extant Homo, Pan, Gorilla, Pongo, and Hylobates...
January 2018: Journal of Human Evolution
https://www.readbyqxmd.com/read/29433862/three-dimensionally-printed-bioactive-ceramic-scaffold-osseoconduction-across-critical-sized-mandibular-defects
#3
Christopher D Lopez, J Rodrigo Diaz-Siso, Lukasz Witek, Jonathan M Bekisz, Bruce N Cronstein, Andrea Torroni, Roberto L Flores, Eduardo D Rodriguez, Paulo G Coelho
BACKGROUND: Vascularized bone tissue transfer, commonly used to reconstruct large mandibular defects, is challenged by long operative times, extended hospital stay, donor-site morbidity, and resulting health care. 3D-printed osseoconductive tissue-engineered scaffolds may provide an alternative solution for reconstruction of significant mandibular defects. This pilot study presents a novel 3D-printed bioactive ceramic scaffold with osseoconductive properties to treat segmental mandibular defects in a rabbit model...
March 2018: Journal of Surgical Research
https://www.readbyqxmd.com/read/29401707/in-vivo-evaluation-of-3d-printed-polycaprolactone-scaffold-implantation-combined-with-%C3%AE-tcp-powder-for-alveolar-bone-augmentation-in-a-beagle-defect-model
#4
Su A Park, Hyo-Jung Lee, Keun-Suh Kim, Sang Jin Lee, Jung-Tae Lee, Sung-Yeol Kim, Na-Hee Chang, Shin-Young Park
Insufficient bone volume is one of the major challenges encountered by dentists after dental implant placement. This study aimed to evaluate the efficacy of a customized three-dimensional polycaprolactone (3D PCL) scaffold implant fabricated with a 3D bio-printing system to facilitate rapid alveolar bone regeneration. Saddle-type bone defects were surgically created on the healed site after extracting premolars from the mandibles of four beagle dogs. The defects were radiologically examined using computed tomography for designing a customized 3D PCL scaffold block to fit the defect site...
February 4, 2018: Materials
https://www.readbyqxmd.com/read/29396606/3d-printed-models-in-mandibular-reconstruction-with-bony-free-flaps
#5
Banaszewski Jacek, Pabiszczak Maciej, Pastusiak Tomasz, Buczkowska Agata, Kuczko Wiesław, Wichniarek Radosław, Górski Filip
The aim of the study was to compare two types of mandible reconstructive operations with scapula and fibula free flaps: procedures with 3-D models from thermoplastic materials and conventional planning surgeries. 8 patients were treated due to an advanced oral cavity squamous cell carcinoma. In four patients with a mandibular defect, a physical 3-D model consisting of the reconstructed and unaffected sites was prepared for a reconstruction protocol. The 3-D models were designed based to high resolution CT scans...
February 2, 2018: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/29390315/management-strategy-in-patient-with-familial-gigantiform-cementoma-a-case-report-and-analysis-of-the-literature
#6
REVIEW
Hong-Wei Wang, Chun-Yue Ma, Xing-Jun Qin, Chen-Ping Zhang
RATIONALE: Familial gigantiform cementoma (FGC) is a rare benign autosomal dominant fibrocemento-osseous lesion generally limited to the facial bones, typically in the anterior portion of the mandible; it is often associated with abnormalities of the long bones and prepubertal pathologic fractures. Owing to the small number of such patients, a uniform treatment criterion has not been established. This paper presents a patient with FGC who was treated in our department, and offers a systematic review of the patients reported in the literature...
December 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29383005/a-cost-effective-in-house-positioning-and-cutting-guide-system-for-orthognathic-surgery
#7
Peter McAllister, Melanie Watson, Ezra Burke
Introduction: Technological advances in 3D printing can dramatically improve orthognathic surgical planning workflow. Custom positioning and cutting guides enable intraoperative reproduction of pre-planned osteotomy cuts and can result in greater surgical accuracy and patient safety. Objectives: This short paper describes the use of freeware (some with open-source) combined with in-house 3D printing facilities to produce reliable, affordable osteotomy cutting guides...
March 2018: Journal of Maxillofacial and Oral Surgery
https://www.readbyqxmd.com/read/29381618/cone-beam-computed-tomography-based-three-dimensional-mcnamara-cephalometric-analysis
#8
Rodrigo Mologni Gonçalves Dos Santos, José Mario De Martino, Francisco Haiter Neto, Luis Augusto Passeri
This article introduces a method that extends the McNamara cephalometric analysis to produce 3-dimensional (3D) measurement values from cone-beam computed tomography images. In the extended method, the cephalometric landmarks are represented by 3D points; the bilateral cephalometric landmarks are identified on both sides of the skull; the cephalometric lines, with the exception of the facial axis, are represented by 3D lines; the cephalometric planes, with the exception of the facial plane, are represented by planes; the effective mandibular length, the effective midfacial length, and the lower anterior facial height are measured as 3D point-to-point distances; the nasion perpendicular to point A, the pogonion to nasion perpendicular, the upper incisor to point A vertical, and the lower incisor to point A-pogonion line are measured each as components of a vector; the facial axis angle is measured as a line-to-plane angle; and the mandibular plane angle is measured as a plane-to-plane angle...
January 19, 2018: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/29378985/evaluation-of-accessory-mental-foramina-morphology-with-cone-beam-computed-tomography
#9
M Gümüşok, Z Z Akarslan, A Başman, Ö Üçok
BACKGROUND: Accessory mental foramen (AMF) is the extra mental foramen (MF) located in the mandible. The recognition of AMF is important to avoid complications during surgical procedures involving MF and cheeks. AIM: This study aimed to determine the prevalence, localization, and size of AMF by using cone-beam computed tomography (CBCT). MATERIALS AND METHODS: CBCT images of 645 patients over 13-14 years (male 281; female 364) were retrospectively evaluated...
December 2017: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/29356920/3d-accuracy-of-implant-positions-in-template-guided-implant-placement-as-a-function-of-the-remaining-teeth-and-the-surgical-procedure-a-retrospective-study
#10
Sigmar Schnutenhaus, Cornelia Edelmann, Heike Rudolph, Jens Dreyhaupt, Ralph G Luthardt
OBJECTIVE: The aim of this study was to investigate differences between the virtually planned and clinically achieved implant positions in completely template-guided implantations as a function of the type of edentulous space, the residual natural dentition, and the surgical implementation. MATERIALS AND METHODS: Fifty-six patient cases with a total of 122 implants were evaluated retrospectively. The implantations were completely template-based. The data of the planned implant positions were overlaid with the actual clinical implant positions, followed by measurements of the 3D deviations in terms of coronal (xc) and apical distance, height (xh), and angulation (ang) and statistical analysis...
January 22, 2018: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29341976/cone-beam-ct-assessment-of-the-position-of-the-medial-lingual-foramen-for-dental-implant-placement-in-the-anterior-symphysis
#11
Arturo Sanchez-Perez, Paula Boix-Garcia, Pía Lopez-Jornet
OBJECTIVES: To determine the position of the mandibular medial lingual foramen with cone-beam CT (CBCT) 3D imaging modalities when implants are to be placed in the anterior symphysis of the mandible. MATERIALS AND METHODS: A total of 111 CBCTs were considered acceptable and analyzed. The variables measured were as follows: (1) length of the outlet duct; (2) distance from the canal to the buccal cortex; (3) distance from the canal to the inferior cortex; (4) distance from the canal to the lingual cortex; (5) distance from the canal to the alveoli of the nearest tooth in dentate patients and distance from the canal to the marginal crest in edentulous patients; (6) angle of the duct to the horizontal Frankfurt plane; (7) diameter of the exit orifice; and (8) output level of the socket in relation to the teeth and the presence of bifurcations...
February 2018: Implant Dentistry
https://www.readbyqxmd.com/read/29335485/electron-beam-melting-in-the-fabrication-of-three-dimensional-mesh-titanium-mandibular-prosthesis-scaffold
#12
Rongzeng Yan, Danmei Luo, Haitao Huang, Runxin Li, Niu Yu, Changkui Liu, Min Hu, Qiguo Rong
The study was designed to fulfill effective work-flow to fabricate three-dimensional mesh titanium scaffold for mandibular reconstruction. The 3D titanium mesh scaffold was designed based on a volunteer with whole mandible defect. (1) acquisition of the CT data; (2) design with computer aided design (CAD) and finite element analysis (FEA). The pore size and intervals with the best mechanic strength was also calculated using FEA. (3) fabrication of the scaffold using electron beam melting (EBM); (4) implantation surgery...
January 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29330958/do-muscles-constrain-skull-shape-evolution-in-strepsirrhines
#13
Anne-Claire Fabre, Jonathan M G Perry, Adam Hartstone-Rose, AuróLien Lowie, Andy Boens, MaÏtena Dumont
Despite great interest and decades of research, the musculoskeletal relationships of the masticatory system in primates are still not fully understood. However, without a clear understanding of the interplay between muscles and bones it remains difficult to understand the functional significance of morphological traits of the skeleton. Here, we aim to study the impacts of the masticatory muscles on the shape of the cranium and the mandible as well as their co-variation in strepsirrhine primates. To do so, we use 3D geometric morphometric approaches to assess the shape of each bone of the skull of 20 species for which muscle data are available in the literature...
February 2018: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/29310359/natural-teeth-retained-splint-based-on-a-patient-specific-3d-printed-mandible-used-for-implant-surgery-and-vestibuloplasty-a-case-report
#14
Helin Xing, Jinshuang Wu, Lei Zhou, Sefei Yang
RATIONALE: With respect to improving the quality of oral rehabilitation, the management of keratinized mucosa is as important as bone condition for implant success. To enhance this management, a natural teeth-retained splint based on a patient-specific 3-dimensional (3D) printed mandible was used in vestibuloplasty to provide sufficient keratinized mucosa around dental implants to support long-term implant maintenance. PATIENT CONCERNS: A 28-year-old male patient had a fracture of the anterior andible 1 year ago, and the fracture was treated with titanium...
December 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29304428/approach-towards-the-porous-fibrous-structure-of-the-periodontal-ligament-using-micro-computerized-tomography-and-finite-element-analysis
#15
J Ortún-Terrazas, J Cegoñino, U Santana-Penín, U Santana-Mora, A Pérez Del Palomar
The periodontal ligament (PDL) is a porous and fibrous soft tissue situated around the tooth, which plays a key role in the transmission of loads from the tooth to the alveolar bone of the mandible. Although several studies have tried to characterize its mechanical properties, the behaviour of this tissue is not clear yet. In this study, a new simulation methodology based on a material model which considers the contribution of porous and fibrous structure with different material model formulations depending on the effort direction is proposed...
December 28, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29275154/three-dimensional-growth-pattern-of-the-rat-mandible-revealed-by-periodic-live-micro-computed-tomography
#16
Hak-Jin Kim, Kyeong-Mee Park, Hye-Jin Tak, Ji Wook Choi, Sang-Hoon Kang, Wonse Park, Sang-Hwy Lee
OBJECTIVE: We wanted to evaluate the three-dimensional (3D) mandibular growth of Sprague-Dawley rats from 4th to 16th postnatal weeks with periodic and live micro-computed tomographic scanning. DESIGN: Twenty Sprague-Dawley rats were used for micro-CT scanning from 4th to 16th postnatal weeks. After 3D reconstruction of rat mandible, we performed the linear and angular measurements and the superimposition of the 3D models to evaluate the mandibular growth of rat...
December 16, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/29260271/reconstruction-of-mandibular-contour-using-individualized-high-density-porous-polyethylene-medpor%C3%A2-implants-under-the-guidance-of-virtual-surgical-planning-and-3d-printed-surgical-templates
#17
Yu Wang, Yiqun Zhang, Zhen Zhang, Xiang Li, Jianwei Pan, Jihua Li
BACKGROUND: The mandibular contour plays a significant role in the beautiful and youthful look but the reconstruction remains a challenging problem. The objective of this study was to evaluate the use of individualized high-density porous polyethylene (Medpor®) implants for comprehensive reconstruction of mandibular contour with the aid of computer-aided design/computer-aided manufacturing (CAD/CAM). METHODS: From 2010 to 2014, 12 patients with mandibular contour deformities were enrolled in our retrospective study...
December 19, 2017: Aesthetic Plastic Surgery
https://www.readbyqxmd.com/read/29258172/development-and-assessment-of-a-3d-printed-scaffold-with-rhbmp-2-for-an-implant-surgical-guide-stent-and-bone-graft-material-a-pilot-animal-study
#18
Ji Cheol Bae, Jin-Ju Lee, Jin-Hyung Shim, Keun-Ho Park, Jeong-Seok Lee, Eun-Bin Bae, Jae-Won Choi, Jung-Bo Huh
In this study, a new concept of a 3D-printed scaffold was introduced for the accurate placement of an implant and the application of a recombinant human bone morphogenetic protein-2 (rhBMP-2)-loaded bone graft. This preliminary study was conducted using two adult beagles to evaluate the 3D-printed polycaprolactone (PCL)/β-tricalcium phosphate (β-TCP)/bone decellularized extracellular matrix (bdECM) scaffold conjugated with rhBMP-2 for the simultaneous use as an implant surgical guide stent and bone graft material that promotes new bone growth...
December 16, 2017: Materials
https://www.readbyqxmd.com/read/29243681/conservative-management-of-large-mandibular-dentigerous-cysts-with-a-novel-approach-for-follow-up-two-case-reports
#19
Ieva Gendviliene, Paul Legrand, Laura Ferreira Pinheiro Nicolielo, Deepti Sinha, Yannick Spaey, Constantinus Politis, Reinhilde Jacobs
BACKGROUND: Dentigerous cysts are odontogenic cysts of the jaws accounting for approximately 24% of all epithelium-lined jaw cysts. Rarely, these cysts can become extremely large causing additional symptoms, while challenging treatment. This article represents a novel approach for radiological treatment follow up of large dentigerous cysts. MATERIAL AND METHODS: Dentigerous cysts were treated by marsupialization, using dedicated obturators and enucleation of the cyst afterwards...
2017: Stomatologija
https://www.readbyqxmd.com/read/29236918/peri-implant-assessment-via-cone-beam-computed-tomography-and-digital-periapical-radiography-an-ex-vivo-study
#20
Nicolau Silveira-Neto, Mateus Ericson Flores, João Paulo De Carli, Max Dória Costa, Felipe de Souza Matos, Luiz Renato Paranhos, Maria Salete Sandini Linden
OBJECTIVES: This research evaluated detail registration in peri-implant bone using two different cone beam computer tomography systems and a digital periapical radiograph. METHODS: Three different image acquisition protocols were established for each cone beam computer tomography apparatus, and three clinical situations were simulated in an ex vivo fresh pig mandible: buccal bone defect, peri-implant bone defect, and bone contact. Data were subjected to two analyses: quantitative and qualitative...
November 2017: Clinics
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