Dentistry and Medical Research最新文献_第8页

Evaluation of the core thickness and resin cement on the fracture strength of zirconia-based multilayer computer-aided design/computer-aided manufacturing ceramic crowns 锆基多层计算机辅助设计/计算机辅助制造陶瓷冠芯厚度及树脂胶结对其断裂强度的影响

Dentistry and Medical Research Pub Date : 1900-01-01 DOI: 10.4103/DMR.DMR_33_18

İ. Kavut, Şafak Külünk

{"title":"Evaluation of the core thickness and resin cement on the fracture strength of zirconia-based multilayer computer-aided design/computer-aided manufacturing ceramic crowns","authors":"İ. Kavut, Şafak Külünk","doi":"10.4103/DMR.DMR_33_18","DOIUrl":"https://doi.org/10.4103/DMR.DMR_33_18","url":null,"abstract":"Aim: The purpose of this study was to evaluate the effect of thickness of zirconia core and different resin cements on the fracture strength of veneered zirconia crowns designed by multilayer technique. Materials and Methods: Forty metal dies were constructed to replica maxillary molar. Forty zirconia cores (Sirona inCoris ZI) were designed and constructed (inLab 4.4) with different thicknesses. The thickness of zirconia core was selected as 0.5 and 0.7 mm. Forty Feldspathic ceramic (VITABLOCS Mark II) veneers were fabricated (inLab 4.4) onto the zirconia cores. The zirconia cores were divided into two subgroups, and veneers were cemented with one of the following resin cement: self-cure, self-adhesive resin cement with light-cured option (Multilink N), and a dual-cure resin cement (Panavia F 2.0). Then, crowns were cemented to the metal dies. All the specimens were subjected to thermal cycling 5000 times (5°C–55°C ± 2°C, immersion time: 30 s). A universal testing machine was used for fracture strength test at a crosshead speed of 1 mm/min. The data were analyzed with one-way analysis of variance (α = 0.05). Stereomicroscopy was used to evaluate the failure modes and surface structure. Results: Zirconia core thickness and resin cement material affected the fracture strength (P","PeriodicalId":413497,"journal":{"name":"Dentistry and Medical Research","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131928117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Treatment modalities in zygomatic complex fractures: A prospective short clinical study 颧骨复合体骨折的治疗方式:一项前瞻性短期临床研究

Dentistry and Medical Research Pub Date : 1900-01-01 DOI: 10.4103/2348-1471.124998

Ramesh Candamourty, V. Narayanan, M. Baig, Muthusekar, Manoj K. Jain, R. Babu

{"title":"Treatment modalities in zygomatic complex fractures: A prospective short clinical study","authors":"Ramesh Candamourty, V. Narayanan, M. Baig, Muthusekar, Manoj K. Jain, R. Babu","doi":"10.4103/2348-1471.124998","DOIUrl":"https://doi.org/10.4103/2348-1471.124998","url":null,"abstract":"Introduction: Zygomatic complex fractures or the tetrapod fractures are common to occur followed by the nasal bone fractures because of its prominent location. At the same time, it is difficult to obtain perfect reduction and contour postoperatively because of its complex involvement with four bones namely maxillary, temporal, orbital and greater wing of sphenoid bone. Various classifications have been put forward for better understanding and planning of treatment protocol. Aim: This study aims at comparing the following variables after reduction and fixation of fracture zygomatic complex; 1. Esthetics 2. Restoration of anatomical form 3. Occlusion 4. Function 5. Neurological deficits. Materials and Methods: Twenty patients were selected following a clinical and radiographic examination of fracture of the zygomatic complex. Reduction techniques used were Gillie's, Dingman's lateral eyebrow, and upper buccal sulcus approaches. Fixation was done at single-point or two-point or three-point protocol by transosseous wiring or miniplate osteosynthesis. Results: Among the twenty cases treated, all were males. Age distribution of the patients was between 20-60 years with a mean age of 39.5 years. There was facial asymmetry in four cases postoperatively and two among them did not follow postoperative instructions. Conclusions: Closed reduction namely Gillie's temporal approach was found to be the best reduction technique and the protocol of three point, miniplate fixation was effective in terms of stability and relapse.","PeriodicalId":413497,"journal":{"name":"Dentistry and Medical Research","volume":"715 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115126846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Aggressive fibromatosis of the infratemporal region 颞下区侵袭性纤维瘤病

Dentistry and Medical Research Pub Date : 1900-01-01 DOI: 10.4103/2348-1471.124999

Samir Ahmed, R. Pramod, Sharan J Shetty, Pramod S Ingaleshwar

引用次数: 3

Waterpipe smoking: A traditional health hazard passed through generations 水烟管:世代相传的传统健康危害

Dentistry and Medical Research Pub Date : 1900-01-01 DOI: 10.4103/DMR.DMR_5_19

A. Raj, S. Patil, K. Awan

引用次数: 2

Towards designing effective scientific research 走向设计有效的科学研究

Dentistry and Medical Research Pub Date : 1900-01-01 DOI: 10.4103/2348-1471.125001

K. Abdalla

引用次数: 0

Awareness of Oral Health Changes during Menstruation: A Questionnaire-Based Survey among Adolescent Girls 青春期女孩月经期间口腔健康变化意识的问卷调查

Dentistry and Medical Research Pub Date : 1900-01-01 DOI: 10.4103/DMR.DMR_41_18

Sheiba Gomes, Sandhya Tamgadge, S. Acharya, Prem R. Thapar, Rutika R Patil, S. Khanapure

引用次数: 2

The Journey begins here 旅程从这里开始

Dentistry and Medical Research Pub Date : 1900-01-01 DOI: 10.4103/2348-1471.124984

S. Peeran

引用次数: 4

Genotoxicity evaluation of locally produced nano-hydroxyapatite-silica: An in vitro study using the bacterial reverse mutation test 本地生产的纳米羟基磷灰石-二氧化硅的遗传毒性评价:使用细菌反向突变试验的体外研究

Dentistry and Medical Research Pub Date : 1900-01-01 DOI: 10.4103/DMR.DMR_39_18

N. Ghani, Aifa Nadhirah Muhammad Sazri, Chan Yunn Yee, Norhayati Luddin, K. Ponnuraj

{"title":"Genotoxicity evaluation of locally produced nano-hydroxyapatite-silica: An in vitro study using the bacterial reverse mutation test","authors":"N. Ghani, Aifa Nadhirah Muhammad Sazri, Chan Yunn Yee, Norhayati Luddin, K. Ponnuraj","doi":"10.4103/DMR.DMR_39_18","DOIUrl":"https://doi.org/10.4103/DMR.DMR_39_18","url":null,"abstract":"Background: Nanohydroxyapatite-silica (nanoHA-Silica) has been produced by one-pot sol-gel technique. The material when incorporated into commercial Glass Ionomer Cement (GIC) was found to exhibit higher Vickers hardness, compressive strength, and flexural strength compared to conventional GIC. However, before starting to be used and exposed to the human cell, every material product should undergo for genotoxic evaluation. Thus, the objective of this in vitro study was to evaluate the genotoxicity of locally produced nanoHA-Silica under bacterial reverse mutation assay (Ames test). Materials and Methods: Four Salmonella typhimurium strains TA98, TA102, TA1535, and TA1537 were incubated with nanoHA-Silica in the presence and absence of exogenous metabolic activation system (S9) at five different concentrations (0.3125, 0.625, 1.25, 2.5, and 5 mg/plate) along with appropriate positive and negative controls. The assessment of the results was based on the number of revertant colonies in each plate, and the results were regarded as mutagenic when the number of revertant colonies was more than two-fold of the negative control. Results: There was no significant increase in the number of revertant colonies corresponding to the increase in the concentrations of the test substance for all the five bacterial strains treated with or without S9. Conclusion: NanoHA-Silica-GIC was non-genotoxic and had no mutagenic potential under present test conditions.","PeriodicalId":413497,"journal":{"name":"Dentistry and Medical Research","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124146813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3