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Feasibility of using Latex Examination Gloves as Dental Dam: A Tensile Strength Study 使用乳胶检查手套作为牙坝的可行性:抗拉强度研究
Pub Date : 2015-09-01 DOI: 10.24191/cos.v2i0.17521
Bam Sabri, Nhm Radzi, Fza Hadi, IH Ismail
Objective: To evaluate feasibility of hand gloves as a rubber dam isolation alternative, in respect of physical properties. Materials and Methods: A randomized controlled trial study design was used. Three types of gloves were tested with two types of a rubber dam used as the control group. Cut-out pattern of dumb-bell shapes were made from 35 samples for each type of groups and tensile strength were tested using Universal Testing Machine and the Trapezium X software. All tests for physical requirements were performed in accordance with American Society for Testing and Materials D412, Standard Test Methods for Vulcanized Rubber and Thermoplastic Rubbers and Thermoplastic Elastomers-Tension. Findings were analyzed by analysis of variance (ANOVA) and differences were compared using a Tukey-Kramer interval calculated at the 0.05 significance level. Results: Heavy gauge rubber dam has the highest Mean (calculated at the 0.05 significance level) except for maximum stress calculated at entire area. Medium-gauge rubber dam has significantly higher tensile strength (44.5075 N/mm2) when compared to heavy-gauge rubber dam (35.7787 N/mm2) although it was 0.09mm thinner. Discovery 2020 Powder Free Latex Examination Gloves with tensile strength value of 28.5922 N/mm2 (±3.27366) is more than the minimum requirement specified by American Federal Specification ZZ-R90B Rubber Dam (Dental, 1985) (4000 pounds per square inch or 27.6 N/mm2). For all variable tested, all groups are significantly different from each other. The mean square between the groups was quite large. Conclusion: This study shows that there are significant differences between the physical strength of latex gloves when compared to rubber dam. However, the comparison between thickness and tensile strength among various rubber dam, did not correspond proportionately. Only one type of rubber gloves met the minimum requirement but that is just one aspect. In view of these mixed results, more research is needed before we can conclude that it is feasable that we use hand gloves to replace rubber dam.
目的:从物理性能方面评价手套作为橡胶坝隔离替代品的可行性。材料与方法:采用随机对照试验设计。测试了三种类型的手套,两种类型的橡胶坝作为对照组。采用通用试验机和Trapezium X软件对各类型组35个样品进行哑铃形状的裁剪,并进行拉伸强度测试。所有物理要求的试验均按照美国试验和材料学会D412《硫化橡胶、热塑性橡胶和热塑性弹性体-张力的标准试验方法》进行。结果采用方差分析(ANOVA)进行分析,差异采用Tukey-Kramer区间进行比较,显著性水平为0.05。结果:除全面积最大应力外,厚板橡胶坝的平均值最高(以0.05显著性水平计算)。中等规格橡胶坝的抗拉强度(44.5075 N/mm2)明显高于厚规格橡胶坝(35.7787 N/mm2),但厚度仅为0.09mm。Discovery 2020无粉乳胶检测手套抗拉强度值为28.5922 N/mm2(±3.27366),超过美国联邦规范ZZ-R90B橡胶坝(牙科,1985)规定的最低要求(4000磅每平方英寸或27.6 N/mm2)。对于所有被测变量,各组之间存在显著差异。两组之间的均方相当大。结论:本研究表明乳胶手套与橡胶坝的物理强度存在显著差异。但不同类型橡胶坝的厚度与抗拉强度的对比并不成正比。只有一种橡胶手套符合最低要求,但这只是一个方面。鉴于这些喜忧参半的结果,在我们得出用手套代替橡胶坝是否可行的结论之前,还需要更多的研究。
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引用次数: 0
Blending the Appearance of All-Ceramic Crowns in Fluorosis Condition with Direct Chair-Side Technique 氟中毒全瓷冠外观与直接椅侧技术的融合
Pub Date : 2015-09-01 DOI: 10.24191/cos.v2i0.17526
Sma Ghani, Asaz Saifudin, Main Zari, TA Mustaza
Dental fluorosis incidence had been reported to be affecting children widely, especially in water-fluoridated area. As these children grow into young adults, perceived aesthetic problems arise mainly due to their concern with generalized mottled and stained teeth appearance. Fixed prosthodontics treatment involving single anterior tooth in patients with generalized fluorosis condition had been found challenging due to aesthetic restorability to blend with fluorosis condition. Clinical considerations: A simplified procedural direct chair-side technique of mimicking fluorosis condition onto anterior all-ceramic crowns are discussed in this paper. The mimicked fluorosis is reversible and has the opportunity to be adjusted according to the patient’s fluorosis condition thus hindering the need to redo the crown in the future. Conclusions: The appearance of anterior all-ceramic crowns with direct chair-side staining technique provided blended and harmonized well with the dental fluorosis condition in both patients thus, giving natural looking smile.
据报道,氟牙症的发病率广泛影响儿童,特别是在水氟化地区。随着这些孩子成长为年轻人,审美问题的出现主要是由于他们对牙齿外观的普遍斑点和染色的关注。广泛性氟中毒患者单前牙的固定修复治疗由于美观的可恢复性与氟中毒的融合而具有挑战性。临床注意事项:本文讨论了一种简化的直接椅侧技术,在前牙全瓷冠上模拟氟中毒的情况。模拟氟中毒是可逆的,并且有机会根据患者的氟中毒情况进行调整,从而避免了将来重做冠的需要。结论:采用直接椅侧染色技术的前牙全瓷冠的外观与氟斑牙患者的情况融合协调,使患者的笑容看起来自然。
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引用次数: 0
Detail Reproduction of Elastomeric Materials: Effect of Viscosity and Groove Geometry 弹性材料的细节再现:粘度和沟槽几何形状的影响
Pub Date : 2015-09-01 DOI: 10.24191/cos.v2i0.17523
Nzn Mahmood, N. Kasim, M. Azuddin, Nla Kassim
Objective: To evaluate the effect of type of viscosity and groove on surface detail reproduction of elastomeric impression materials. Methods: Two polyvinylsiloxane and polyether elastomeric impression materials were investigated. An aluminium cylindrical reference block with V- and U-shaped grooves of 1 mm and 2 mm in depth was machined using CAD-CAM system. Impressions of the block were taken to produce 35 master dies. Each die was immersed in distilled water for 5 minutes prior to impression making. Surface topography of the dies and impressions were captured using Alicona Imaging System. Mean difference in depth between the master dies and corresponding impressions’ grooves were analyzed. Results: Type of viscosities and groove showed significant main effects on surface detail (p < .01), but no significant interaction was observed between the two (p > .01). Express™ putty/light exhibited the lowest mean difference in depth for all grooves. The highest mean difference for U1 (38.3μm ± 21.55), U2 (52.96μm ± 30.39),V1 (45.02μm ± 34.82) and V2 (58.44μm ± 44.19) was obtained from Impregum medium, Aquasil medium, Impregum™ heavy/light and Impregum™ heavy/light groups respectively. Conclusion: Express putty/light-bodied material produced the best surface detail, and Ushaped groove showed superior detail reproduction.
目的:探讨黏度和凹槽类型对弹性体印模材料表面细节再现的影响。方法:对聚乙烯烷和聚醚两种弹性体印模材料进行了研究。采用CAD-CAM系统加工了深为1mm和2mm的V形槽和u形槽的铝制圆柱形参考块。该块的印痕被用来生产35个主模具。每个模具在压模前浸泡在蒸馏水中5分钟。使用Alicona成像系统捕获模具和压痕的表面形貌。分析了主模与相应模槽的平均深度差。结果:黏度类型和凹槽对表面细节有显著的主要影响(p < 0.01),但两者之间没有显著的交互作用(p > 0.01)。Express™腻子/light在所有凹槽中表现出最小的平均深度差异。Impregum培养基、Aquasil培养基、Impregum™重/轻和Impregum™重/轻组的平均差异最大,分别为U1 (38.3μm±21.55)、U2 (52.96μm±30.39)、V1 (45.02μm±34.82)和V2 (58.44μm±44.19)。结论:速成腻子/轻质材料的表面细节效果最好,Ushaped槽的表面细节再现效果较好。
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引用次数: 0
Adopting Law School Pedagogy into Teaching and Learning of Dentistry - My Melbourne Experience 将法学院教学法运用到牙科教学中——我在墨尔本的经验
Pub Date : 2015-09-01 DOI: 10.24191/cos.v2i0.17527
M. Ahmad
Adopting Law School Pedagogy into Teaching and Learning of Dentistry - My Melbourne Experience
将法学院教学法运用到牙科教学中——我在墨尔本的经验
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引用次数: 0
Assessment of Interradicular Spaces for Miniscrew Placement in Class I Subjects 对一级学科微型实习的根际空间评估
Pub Date : 2015-09-01 DOI: 10.24191/cos.v2i0.17522
N. Al-Jaf, Rma Wahab, Mia Hassan
Objectives: To assess interradicular spaces of maxilla and mandible in subjects with class I sagittal skeletal relationship as an aid for miniscrew placement. Materials and Methods: The study was carried out using cone-beam computed tomography (CBCT) images of 47 adult subjects with class I skeletal relationship. Interradicular spaces were obtained at the alveolar processes from first premolar to second molar at 2 different vertical levels (6 and 8mm) from the cementoenamel junction (C.E.J). Results: In the maxilla, the highest interradicular space existed between second premolar and first molar. In the mandible, the highest interradicular space existed between first and second molar. All mandibular measurements were higher than their respective maxillary measurement. Generally, availability of interradicular space increases apically in both arches, but the difference is not significant. In the maxilla, male subjects’ measurement were significantly higher at 8 mm level between second premolar and first molar and between first and second molar Conclusions: Interradicular spaces in the maxillary and mandibular alveolar spaces are available for miniscrew placement. In both arches, a more apical location provides more interradicular space. However, careful planning is needed to avoid sinus perforation.
目的:评估具有I类矢状骨关系的上颌和下颌骨的根间间隙作为微型支架放置的辅助。材料与方法:采用锥束计算机断层扫描(CBCT)对47例具有I类骨骼关系的成人受试者进行研究。第一前磨牙至第二磨牙的牙槽突在距牙髓-牙釉质交界处(C.E.J) 2个不同垂直水平(6和8mm)处获得根际间隙。结果:上颌第二前磨牙与第一磨牙之间的牙根间隙最大。下颌第一磨牙和第二磨牙之间的牙根间隙最大。所有下颌骨测量值均高于各自的上颌测量值。一般情况下,根间空间的可用性在两个弓的顶端增加,但差异不显著。在上颌,男性受试者在第二前磨牙与第一磨牙之间以及第一磨牙与第二磨牙之间的测量值明显高于8 mm水平。结论:上颌和下颌牙槽间隙的根间间隙可用于微型支架的放置。在两个弓中,更顶端的位置提供了更多的根间空间。然而,需要仔细计划以避免鼻窦穿孔。
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引用次数: 0
Muscular Pain Among Dentists - A Pilot Study 牙医肌肉疼痛的初步研究
Pub Date : 2015-09-01 DOI: 10.24191/cos.v2i0.17524
F. Sabirin, SS Ahmad, Wzaw Kamarudin
Background: Muscular pain is the most common symptom associated to muscular skeletal disorders (MSDs). Dentists were exposed to ergonomic hazards while treating the patients. Without proper dental ergonomics, they are predisposed to the MSDs. Objective: This present study was designed to analyse the prevalence of muscular pain among practising dentists in Universiti Teknologi MARA (UiTM) and its relatedness to ergonomic factors. Methodology: A total of 25 dentists were participated in this pilot study. The inclusion criteria include working experience of at least six months and those who were readily diagnosed with musculoskeletal disorders were excluded. A self-administered questionnaire was employed to gather demographic information and close ended (“yes” or “no”) questions were asked to assess the muscular pain experienced in the last 12 months. The collected data were then analysed statistically. Result: The result showed a 100% response rate. 92% of the respondents were reported to experience muscular pain, particularly on the upper body parts. Only maintenance of same postures without microbreaks and performing torsions or cervical flexions to improve vision of oral cavity correlate significantly (P<0.05) to the presence of muscular pain that respondent experienced. However, age, nature of work and high woking hours per week does not correlate to the muscular pain. Conclusion: The prevalence of muscular pain among dentists in UiTM is high which indirectly suggested the lack of dental ergonomic awareness and practice in their routine at work.
背景:肌肉疼痛是肌肉骨骼疾病(MSDs)最常见的症状。牙医在治疗病人时暴露在人体工程学危害中。没有适当的牙科人体工程学,他们倾向于msd。目的:本研究旨在分析意大利理工大学(Universiti technologii MARA, UiTM)执业牙医肌肉疼痛的患病率及其与人体工程学因素的关系。方法:共有25名牙医参与了这项初步研究。纳入标准包括至少六个月的工作经验,那些容易被诊断为肌肉骨骼疾病的人被排除在外。采用自我管理的问卷收集人口统计信息,并询问封闭式(“是”或“否”)问题,以评估过去12个月经历的肌肉疼痛。然后对收集到的数据进行统计分析。结果:有效率为100%。据报道,92%的受访者感到肌肉疼痛,尤其是上半身。仅维持相同的姿势,不进行微折断,并进行扭转或颈椎屈曲以改善口腔视力与被调查者所经历的肌肉疼痛的存在显著相关(P<0.05)。然而,年龄、工作性质和每周工作时间长与肌肉疼痛无关。结论:UiTM牙科医生肌肉疼痛的发生率较高,间接说明其在日常工作中缺乏对口腔人体工程学的认识和实践。
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引用次数: 0
Physicochemical and Antioxidant Properties of Malaysian Tualang Honey on Long Term Storage 马来西亚土朗蜂蜜长期贮藏的理化及抗氧化特性
Pub Date : 2014-09-01 DOI: 10.24191/cos.v1i0.17530
RK Kishore, S. Nasar, P. Viji, CK Lim, A. Halim
Honey is a rich source of natural nutrients. Its production is a slow, natural process with the pace of which varies seasonally. However, based on recent reports, we hypothesize that the long-term storage of processed honey, even under the most appropriate storage conditions, results in a deterioration of its quality. To test our hypothesis, we collected Tualang honey samples harvested during the years 2005, 2008, 2009 and 2010 and tested various parameters including physicochemical properties and also performed comparative analyses of antioxidant capacities to assess its medicinal values. Our results indicate that, upon long-term storage, the quality of honey samples deteriorates, as observed in our TH 2008 and TH 2005 year honey samples, which showed unacceptable quality based on the recommended criteria of free acidity (71.34±1.31 meq/kg), moisture (27.72%), diastase activity (3.38±0.34 Goth scale) and hydroxymethylfurfural (HMF) (449.89±3.23 mg/kg) by Codex and European Commission Regulation. A significant (p<0.05) decrease in antioxidant properties were also observed. In the present study, we show that, even after appropriate processing, most of the quality parameters of honey decrease, which suggest that these parameters could otherwise be used as markers to assess the age of the honey.
蜂蜜是天然营养物质的丰富来源。它的生产是一个缓慢而自然的过程,其速度随季节而变化。然而,根据最近的报告,我们假设长期储存加工过的蜂蜜,即使在最合适的储存条件下,也会导致其质量恶化。为了验证我们的假设,我们收集了2005年、2008年、2009年和2010年收获的土朗蜂蜜样品,测试了各种参数,包括物理化学性质,并进行了抗氧化能力的比较分析,以评估其药用价值。我们的研究结果表明,经过长期储存,蜂蜜样品的质量会恶化,正如我们在2008年和2005年的蜂蜜样品中观察到的那样,根据国际食品法典和欧盟委员会法规推荐的游离酸度(71.34±1.31 meq/kg)、水分(27.72%)、淀淀酶活性(3.38±0.34 Goth标度)和羟甲基糠醛(HMF)(449.89±3.23 mg/kg)标准,蜂蜜样品的质量不合格。抗氧化性能显著降低(p<0.05)。在本研究中,我们发现,即使经过适当的处理,蜂蜜的大多数质量参数也会下降,这表明这些参数可以作为评估蜂蜜年龄的标记。
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引用次数: 0
Shear Bond Strength of Orthodontic Brackets Bonded with Different Curing Methods 不同固化方法粘结正畸托槽的剪切粘结强度
Pub Date : 2014-09-01 DOI: 10.24191/cos.v1i0.17531
FI Bahnasi, NM Abdullah, M. Hassan
Objectives: To evaluate the effect of light-cure devices and curing times on the shear bond strength (SBS) of orthodontic brackets. Material and Methods: 60-extracted human premolars were divided into 6-groups of 10-teeth each and bonded with stainless-steel brackets by using 3M Unitek Transbond XT composite. Specimens were cured with halogen, LED and plasma arc lights with two different times for each. The specimens were subjected to shear force till debond with a crosshead speed of 1mm/min and tested after 5min. The stress was calculated and data were subjected to statistical analysis. Results: one-way ANOVA and Dunnett T3 post hoc comparison test were used. There were no significant differences between the 6 groups (p < 0.05). Conclusions: all curing light methods with loading force after 5 min achieved SBS more than the normal range; therefore, arch wire can be inserted at the same visit using any of tested curing light device or curing time.
目的:评价光固化装置和固化时间对正畸托槽剪切粘结强度(SBS)的影响。材料与方法:将拔除的60颗人前磨牙分为6组,每组10颗牙,采用3M Unitek Transbond XT复合材料粘接不锈钢托槽。用卤素灯、LED灯和等离子弧灯分别固化2次。试件以1mm/min的十字速度承受剪切力直至脱落,5min后进行试验。计算了应力,并对数据进行了统计分析。结果:采用单因素方差分析和Dunnett T3事后比较检验。6组间比较差异无统计学意义(p < 0.05)。结论:加载荷5 min后,所有光固化方法的SBS均大于正常范围;因此,拱丝可以在同一次访问中使用任何被测试的固化光装置或固化时间插入。
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引用次数: 0
Review of BP Measurement in Clinical and Research 血压测量在临床和研究中的进展
Pub Date : 2014-09-01 DOI: 10.24191/cos.v1i0.17528
F. Sabirin
Review of BP Measurement in Clinical and Research
血压测量在临床和研究中的进展
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引用次数: 0
Occlusal Features of 12 Years Old Malaysian Malay Schoolchildren in Shah Alam 沙阿南12岁马来西亚马来学童的咬合特征
Pub Date : 2014-09-01 DOI: 10.24191/cos.v1i0.17529
Mtm Elfseyie, NM Abdullah, M. Hassan
Objectives: To assess the occlusal features, tongue habits, lip competence and their gender dimorphism in 12 years old Malaysian Malay school-children. Materials and methods: The method involved clinical examination of 208 subjects from public schools in Shah Alam, Selangor, Malaysia. Occlusal status was assessed according to Angle classification. The following features were also assessed and recorded: overjet, overbite, traumatic overbite, crowding, spacing, midline diastema, cross bite, scissors bite, dental midline shifts, canine displacement, missing teeth, traumatically fractured teeth, tongue thrust and lip competence. Descriptive statistics were used for all measurements; Chi-square was used to assess gender differences. Results: Class I malocclusion is most prevalent in boys and girls (44.0% and 43.8% respectively), followed by Class III malocclusion (31% in boys and 30.4% in girls). Anterior crowding was found in 69.7% of the sample while anterior spacing was found in 30.8%. Incompetent lips were more common in boys than girls. Conclusions: The prevalence of malocclusion in this age group may warrant the need for more preventive and interceptive measures in dental and oral health planning.
目的:探讨12岁马来西亚马来学龄儿童的咬合特征、舌习惯、唇部能力及其性别二态性。材料和方法:方法涉及马来西亚雪兰莪州沙阿南公立学校208名受试者的临床检查。根据角度分类评估咬合状态。还评估并记录了以下特征:覆盖、覆盖咬合、外伤性覆盖咬合、拥挤、间距、中线间隙、交叉咬合、剪刀咬合、牙齿中线移位、犬齿移位、缺牙、外伤性断牙、舌推力和嘴唇能力。所有测量均采用描述性统计;采用卡方法评估性别差异。结果:男孩和女孩中I类错牙合发生率最高(分别为44.0%和43.8%),其次是III类错牙合(男孩31%,女孩30.4%)。69.7%的样本出现前牙拥挤,30.8%的样本出现前牙间距。不称职的嘴唇在男孩中比女孩更常见。结论:该年龄组错牙合的患病率可能需要在牙齿和口腔健康规划中采取更多的预防和拦截措施。
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引用次数: 4
期刊
Compendium of Oral Science
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