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Odontology

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https://www.readbyqxmd.com/read/28421361/erratum-to-a-comparative-study-of-the-bone-contact-to-zirconium-and-titanium-implants-after-8%C3%A2-weeks-of-implantation-in-rabbit-femoral-condyles
#1
Abdullah Aldosari AlFarraj, Anil Sukumaran, Mohammad D Al Amri, Aja Bart Van Oirschot, John A Jansen
No abstract text is available yet for this article.
April 18, 2017: Odontology
https://www.readbyqxmd.com/read/28389977/micro-computed-tomography-analysis-of-early-stage-bone-healing-using-micro-porous-titanium-mesh-for-guided-bone-regeneration-preliminary-experiment-in-a-canine-model
#2
Yunia Dwi Rakhmatia, Yasunori Ayukawa, Yohei Jinno, Akihiro Furuhashi, Kiyoshi Koyano
The aim of this study was to evaluate the amount of bone formation beneath a defect area after treatment with titanium mesh membranes with different thicknesses and pore sizes alone or in combination with bone graft to induce bone formation during the early stage of healing time. The mandibular premolars were extracted bilaterally from three adult beagle dogs, and 8-mm-diameter bone defects were created on the buccal site of the premolar regions. Hydroxyapatite bone graft substitute was applied in the defect site unilaterally, and other site was left empty...
April 7, 2017: Odontology
https://www.readbyqxmd.com/read/28386653/cell-viability-and-hemocompatibility-evaluation-of-a-starch-based-hydrogel-loaded-with-hydroxyapatite-or-calcium-carbonate-for-maxillofacial-bone-regeneration
#3
Juan Carlos Flores-Arriaga, Amaury de Jesús Pozos-Guillén, Diana María Escobar-García, Christian Grandfils, Bernardino Isaac Cerda-Cristerna
The objective of this study is to evaluate the cell viability and hemocompatibility of starch-based hydrogels for maxillofacial bone regeneration. Seven starch-based hydrogels were prepared: three loaded with 0.5, 1 and 2% calcium carbonate (Sigma Aldrich, St. Louis, MO, USA); three loaded with 2, 3 and 4% hydroxyapatite (Sigma Aldrich); and one not loaded as a control. A 10 M NaOH was then added to induce hydrogel formation. Human osteoblasts were cultured on each hydrogel for 72 h. An MTS assay (Cell Titer96; PROMEGA, Madison, WI, USA) was used to assess cell viability...
April 6, 2017: Odontology
https://www.readbyqxmd.com/read/28382581/the-prominent-proteins-expressed-in-healthy-gingiva-a-pilot-exploratory-tissue-proteomics-study
#4
Emre Yaprak, Murat Kasap, Gürler Akpınar, Sibel Kayaaltı-Yüksek, Alper Sinanoğlu, Nil Guzel, Husniye Demirturk Kocasarac
Gingiva is a unique tissue which protects the underlying periodontal tissues from consistent mechanical and bacterial aggressions. Molecular analysis of gingiva is likely to improve our understanding of the underlying biological processes at work. The aim of this preliminary exploratory study is to analyze the proteomic profile of healthy gingiva and to detect prominently expressed proteins. Gingival tissue samples were obtained from periodontally healthy individuals who underwent surgical crown lengthening procedure...
April 5, 2017: Odontology
https://www.readbyqxmd.com/read/28342006/potential-synergistic-effects-of-a-mixture-of-mineral-trioxide-aggregate-mta-cement-and-bacillus-subtilis-in-dental-caries-treatment
#5
Shunya Oka
Bacillus subtilis is nonpathogenic in humans and produces a number of useful substances and, therefore, this bacterium is used in probiotic therapy. There have been trials of B. subtilis for patients with periodontitis, but not for patients with caries. Similarly, mineral trioxide aggregate (MTA) cement has been widely used for endodontic treatment, but there are few reports of its use for caries. Therefore, examinations were performed regarding the benefits of addition of B. subtilis to MTA cement for treatment of dental caries...
March 24, 2017: Odontology
https://www.readbyqxmd.com/read/28321585/a-comparative-study-on-7-year-results-of-all-on-four%C3%A2-immediate-function-concept-for-completely-edentulous-mandibles-metal-ceramic-vs-bar-retained-superstructures
#6
Mustafa Ayna, Aydin Gülses, Yahya Acil
The study aims to document the clinical outcomes over a 7-year period of two techniques used for the rehabilitation of edentulous mandibles according to the "All-on-Four™" concept: (1) fixed complete-arch prostheses fabricated with metal-ceramic implant-supported fixed prosthesis with a titanium framework and all-ceramic crowns and (2) bar-retained implant-supported removable prosthesis with acrylic resin prosthetic teeth. The study was performed on 32 patients who received immediately loaded "All-on-Four™" fixed mandibular prostheses...
March 20, 2017: Odontology
https://www.readbyqxmd.com/read/28321584/antimicrobial-efficacy-and-mechanical-properties-of-bac-modified-hard-and-soft-denture-liners
#7
Pinar Altinci, Murat Mutluay, Eva Söderling, Arzu Tezvergil-Mutluay
This study investigated the antimicrobial efficacy and mechanical strength of hard and soft denture liners modified with benzalkonium chloride (BAC). The specimens (1 mm thickness, 8 mm diameter) were prepared by mixing 0.5, 1, 2 and 5 wt% BAC with soft (Sofreliner Medium, Tokuyama) and hard (Rebase II, Tokuyama) denture liners (n = 5/group). BAC was not added to the controls. Candida albicans ATCC 28366 (A 550 = 0.5) and Streptococcus mutans Ingbritt suspensions (A 550 = 0.35) were pipetted onto the specimens, and incubated for 4 h...
March 20, 2017: Odontology
https://www.readbyqxmd.com/read/28299554/comparison-of-different-techniques-for-removal-of-calcium-hydroxide-from-straight-root-canals-an-in-vitro-study
#8
Anne-Kathrin Pabel, Michael Hülsmann
To compare four different techniques for removal of calcium hydroxide from straight root canals. The present study used the design suggested by Lee et al. (Int Endod J 37:607-612, 32) and van der Sluis et al. (Int Endod J 40:52-57, 17). One-hundred and ten extracted human teeth with straight root canals were prepared to ISO-size 50 and split longitudinally. Two lateral grooves were prepared, filled with calcium hydroxide and the root halves reassembled in a muffle. Calcium hydroxide was removed using one of five techniques: (1) passive ultrasonic irrigation, (2) hydrodynamic irrigation using RinsEndo(®), (3) sonic irrigation using the EndoActivator(®), (4) motor-driven plastic brush (CanalBrush™), and (5) manual irrigation with a syringe as the control group...
March 15, 2017: Odontology
https://www.readbyqxmd.com/read/28275876/the-prevalence-and-morphological-types-of-non-carious-cervical-lesions-nccl-in-a-contemporary-sample-of-people
#9
Yuriko Igarashi, Satoru Yoshida, Eisaku Kanazawa
Non-carious cervical lesions (NCCLs) were examined in 6541 extracted human teeth and classified based on the morphology of the lesions. As a result, NCCLs were found on 38.7% of teeth (41.6% on maxillary teeth and 36.0% on mandibular teeth), and were most frequent on canines and first premolars. According to the new method of classification, the morphology of NCCLs was classified both by the surface contour (SC) and by the cross-sectional contour (CC). Three types of NCCLs appeared to be dominant. The causes of these NCCLs were discussed based on their morphologies, positions where these NCCLs were frequently found, and the results of previous studies...
March 8, 2017: Odontology
https://www.readbyqxmd.com/read/28233070/evaluation-of-chemerin-and-its-receptors-chemr23-and-ccrl2-in-gingival-tissues-with-healthy-and-periodontitis
#10
Erkan Özcan, N Işıl Saygun, Rahşan Ilıkçı, Yıldırım Karslıoğlu, Uğur Muşabak, Sait Yeşillik
Chemerin is a chemoattractant protein that directs inflammatory cells that express its receptor chemokine receptor-like 1 (ChemR23) towards sites of inflammation. C-C chemokine receptor-like 2 (CCRL2), is the other receptor of chemerin, improves the interaction between chemerin and ChemR23. The aim of this study was to evaluate the expression of chemerin and its receptors in gingival tissues with healthy and periodontitis. Tissue biopsy samples were obtained from 20 patients with chronic periodontitis and from the gingiva of 20 healthy individuals undergoing a crown lengthening process...
February 23, 2017: Odontology
https://www.readbyqxmd.com/read/28220264/treatment-of-stage-ii-medication-related-osteonecrosis-of-the-jaw-with-necrosectomy-and-autologous-bone-marrow-mesenchymal-stem-cells
#11
Pit Jacob Voss, Akihiko Matsumoto, Esteban Alvarado, Rainer Schmelzeisen, Fabian Duttenhöfer, Philipp Poxleitner
Treatment strategies for medication-related osteonecrosis of the jaw (MRONJ) remain controversial. Although the AAOMS suggests a conservative approach, a surgical management with necrosectomy is often required when conservative management has failed. Moreover, recent studies have shown promising results using an early stage surgical treatment. Over the past decade, cell-based bone regeneration utilizing bone marrow mesenchymal stem cells (MSCs) received increased attention. MSCs are known to promote wound healing and induce new bone formation in compromised tissue...
February 20, 2017: Odontology
https://www.readbyqxmd.com/read/28215005/effect-of-bite-openings-and-mandibular-protrusion-on-genioglossus-muscle-activity-in-healthy-adults-with-oral-appliance
#12
Jianlan Long, Toru Ogawa, Toshimi Ito, Michikazu Matsuda, Wei Li, Haiyang Yu, Keiichi Sasaki
Oral appliance (OA) can effectively treat obstructive sleep apnea; however, numerous types of oral appliances and designs are variable and the precise mechanisms behind differences in treatment outcomes are uncertain. The objective of this study was to evaluate the effects of different degrees of mandibular position [4° of bite openings (BO): 2, 4, 8 and 12 mm; and protrusion (P): 0, 50%, MAX], for both the upright and supine positions: BO2 mm_P0%, BO4 mm_P0%, BO4 mm_P50%, BO4 mm_PMAX, BO8 mm_P0%, BO12 mm_P0%; with an OA on the: (1) activity of the genioglossus (GG) muscle by electromyogram, (2) inspiration by airflow sensor, and (3) recording mandibular movements (incisor and mandibular condyle point) in each position...
February 18, 2017: Odontology
https://www.readbyqxmd.com/read/28197773/change-in-tongue-pressure-in-patients-with-head-and-neck-cancer-after-surgical-resection
#13
Yoko Hasegawa, Kazuma Sugahara, Tatsuyuki Fukuoka, Shota Saito, Ayumi Sakuramoto, Nobuhide Horii, Saori Sano, Kana Hasegawa, Yuta Nakao, Tomoki Nanto, Kanenori Kadoi, Kuniyasu Moridera, Kazuma Noguchi, Kazuhisa Domen, Hiromitsu Kishimoto
Tongue pressure is reportedly associated with dysphagia. This study investigated relationships among characteristics of head and neck cancer, tongue pressure and dysphagia screening tests performed in patients with head and neck cancer during the acute phase after surgical resection. Fifty-seven patients (36 men, 21 women; age range 26-95 years) underwent surgical resection and dysphagia screening tests (Repetitive Saliva Swallowing Test, Water Swallowing Test, Modified Water Swallowing Test and Food Test) and pre- and postoperative measurement of tongue pressure at 5 time points (preoperatively, and 1-2 weeks and 1, 2, and 3 months postoperatively)...
February 14, 2017: Odontology
https://www.readbyqxmd.com/read/28194543/a-comparative-study-of-the-bone-contact-to-zirconium-and-titanium-implants-after-8%C3%A2-weeks-of-implantation-in-rabbit-femoral-condyles
#14
Abdullah Aldosari AlFarraj, Anil Sukumaran, Mohammad D Al Amri, Aja Bart Van Oirschot, John A Jansen
Zirconium (Zr) has been found to have comparable characteristics to titanium with a favorable modulus of elasticity. In addition, the release of Zr-ions of a Zr implant is supposed to further increase the bone-to-implant response. Therefore, the objective of this study is to compare the bone contact to Zr and Ti implants in the femoral trabecular bone of rabbits. In addition, implants provided with a hydroxyapatite (HA) coating were included, as such a coating was proven before to enhance the secondary implant stability...
February 13, 2017: Odontology
https://www.readbyqxmd.com/read/28160094/marginal-adaptation-and-microleakage-of-a-bulk-fill-composite-resin-photopolymerized-with-different-techniques
#15
Vania Stephanie Sánchez Gamarra, Gilberto Antonio Borges, Luiz Henrique Burnett Júnior, Ana Maria Spohr
The purpose of this study was to investigate the marginal adaptation and microleakage of SonicFill composite with different photopolymerization techniques. Class II cavities were prepared in 40 premolars and divided into groups according to the photopolymerization technique (n = 10): G1:1200 mW/cm(2) for 20 s; G2:1200 mW/cm(2) for 40 s; G3:Soft-start with 650 mW/cm(2) for 5 s and 1200 mW/cm(2) for 15 s; G4:Soft-start with 650 mW/cm(2) for 10 s and 1200 mW/cm(2) for 30 s. The cavities were restored with OptiBond FL adhesive and SonicFill...
February 3, 2017: Odontology
https://www.readbyqxmd.com/read/28150182/changes-in-mandibular-movement-during-chewing-of-different-hardness-foods
#16
Marie Komino, Hiroshi Shiga
In order to clarify the change in mandibular movement during chewing of foods with different hardness, 20 healthy subjects were asked to chew 3 types of gummy jellies (containing 6, 8, and 10% gelatin), and the masseter muscular activity and the mandibular movement were recorded. The indicators representing the muscular activity (integral value of masseter muscular activity), the mandibular movement (opening distance, masticatory width, cycle time, opening maximum velocity and closing maximum velocity), and the stability of masticatory movement were calculated, respectively, and compared among the three foods...
February 1, 2017: Odontology
https://www.readbyqxmd.com/read/27655624/periodontal-tissue-repair-after-sealing-of-the-gap-in-vertical-root-fracture
#17
Tsutomu Sugaya, Mahito Tomita, Youji Motoki, Khurshiduz Zaman, Hirofumi Miyaji, Masamitsu Kawanami
The aim of this study was to determine whether sealing of fracture gap using adhesive resin through the root canal can prevent inflammation of periodontal tissue, and resealing the incompletely sealed fracture gap from outside can resolve such inflammation in experimentally created vertical root fractures. Vertical root fractures were created in incisor of beagles. In the experimental group, the fracture gap was sealed through the root canal with adhesive resin. After 5 weeks, sites with the clinical attachment level ≥4 mm were further divided randomly into the poor-replanting group and the poor-untreated group...
April 2017: Odontology
https://www.readbyqxmd.com/read/27456685/the-influence-of-cyclic-stress-on-surface-properties-of-soft-liners
#18
M Murat Mutluay, Arzu Tezvergil-Mutluay
Soft polymers used under tissue-supported prostheses have limited service life because of surface degradation. PURPOSE: This paper evaluates the changes in surface properties and softness of soft relining materials after cyclic loading in water. MATERIALS AND METHODS: 3 polysiloxane (Silagum AM Comfort, Molloplast B, Mollosil Plus) and 2 acrylic-based (Vertex Soft, Astron LC Soft) proprietary soft relining materials and a vinyl polysiloxane (Imprint 2 Garant) as the reference impression material evaluated...
April 2017: Odontology
https://www.readbyqxmd.com/read/27456684/stain-susceptibility-of-composite-and-ceramic-cad-cam-blocks-versus-direct-resin-composites-with-different-resinous-matrices
#19
Amal Alharbi, Stefano Ardu, Tissiana Bortolotto, Ivo Krejci
To evaluate the stain susceptibility of CAD/CAM blocks and direct composite after long term exposure to various staining agents. 40 disk-shaped samples were fabricated from each of nine materials; six CAD/CAM (Vitablocs Mark II, Paradigm MZ100, Experimental Vita Hybrid Ceramic, Vita Enamic, Experimental Kerr and Lava Ultimate) and three direct composites (Filtek Supreme, Venus Diamond and Filtek Silorane). Samples were randomly divided into five groups (n = 8) according to different staining solutions (distilled water, tea, red wine, coffee and artificial saliva)...
April 2017: Odontology
https://www.readbyqxmd.com/read/27456682/histochemical-study-of-rabbit-medial-pterygoid-muscle-during-postnatal-development
#20
Keisuke Saito, Takumi Morita, Hiroki Takasu, Kozue Kuroki, Takuya Fujiwara, Katsunari Hiraba, Shigemi Goto
The medial pterygoid muscle is a layered structure like the masseter muscle. This study aimed at investigating the regional differences in fiber type composition and fiber diameter of the medial pterygoid muscle in the rabbit from birth until 33 weeks of age. Histochemical analysis of the medial pterygoid muscle was performed during five developmental stages (4, 9, 12, 18, and 33 weeks after birth) in 30 male Japanese white rabbits. Six fiber types (I, IC, IIC, IIA, IIAB, and IIB) were identified by mATPase staining...
April 2017: Odontology
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