International Arab Journal of Dentistry

Objectives: Dental Unit Waterlines (DUWL) have shown to be a perfect host for different pathogenic microorganisms. The purpose of this study was to analyze and compare the level of bacterial contamination in the output water of 2 types of DUWL. Methods: Dental unit water samples from the air/water syringe of the A-dec (A-dec™ Performer 200, Newberg, USA) DUWL type and KaVo (ESTETICA™ E30/E70/E80 Vision, Kavo, Biberach, Germany) type were collected and analyzed for total aerobic flora, Pseudomonas aeruginosa, faecal coliforms, total coliforms, faecal streptococci and sulfite-reducing anaerobic flora. Results: The bacteriological analysis of water samples shows the presence of bacterial contamination at high levels exceeding the standard safety guidelines of 100 CFU/mL set up by the American Dental Association (ADA) and accepted by the Centers for Disease Control and prevention (CDC) on the heterotrophic bacterial load. The data shows no statistically significant differences for all bacteriological parameters studied between the conventional A-dec DUWL type and the KaVo type that has an automated mode of decontamination. Conclusions: Despite all the disinfecting solutions considered to eradicate the bacterial proliferation in DUWL, the problem remains one of the greatest challenges in modern dentistry. Practitioners and medical staff should not underestimate the harmful consequences of this bacterial growth, not only on the health of their patients but also on their own health.

Khalil KHARMA

Louis HARDAN

Cynthia KASSIS

Rim BOURGI

Regina GEITANI

May MALLAH

Elie MAALOUF

Carina MEHANNA ZOGHEIB

Assessment and quantification of the microbial flora in the output water of two types of dental chairs: A comparative study

两种类型牙科椅出水微生物群落的评估与定量分析：一项比较研究

Objectives: to investigate the flexural strength of three materials commonly used for interim implant-supported fixed complete dentures (ISFCDs): conventional heat cure PMMA, CAD/CAM milled PMMA, and carbon fiber-reinforced PMMA. Methods: Sixty specimens (n=60) divided equally into three groups (heat cure, milled, carbon fiber) were prepared. Samples were inspected to ensure absence of voids or irregularities and when required, minor adjustments were made to adjust the dimensions. The samples underwent thermocycling (5-55°C for 2500 cycles) and were then tested using a three-point bend test. Results: There was a statistically significant difference between heat cure PMMA and carbon fiber PMMA (p&lt;0.001), between CAD-CAM resin and carbon fiber resin (p&lt;0.001). There was no significant difference between CAD-CAM and conventional PMMA resin (p&gt;0.05). Conclusions: as clinical implications, using carbon fiber is a viable treatment option for interim ISFCDs. Veneering the material with pink and white resin would improve the overall esthetics.

Jenny ABOU NADER

Carole ABI GHOSN

Paul BOULOS

Nancy CHEMALY

Jihad FAKHOURI

A comparison between the flexural strength of milled, conventional, and carbon fiber PMMA for interim implant supported fixed complete dentures: An In vitro study

临时种植支持固定全口义齿中研磨型、传统型和碳纤维PMMA弯曲强度的比较：一项体外研究

Objectives: The aim of this in-vitro study is to assess and compare the load capacity of teeth with canals prepared using progressive taper versus regressive taper. Methods: Twenty-seven extracted mandibular molars were categorized into three equal groups. The negative control group involved teeth that were accessed and restored with composite resin without canal preparation. The regressive canal preparation group used the TruNatomy file system, while the progressive canal preparation group employed the ProTaper Gold system. Subsequently, all samples underwent loading using a universal testing machine until tooth fracture occurred. The force required to fracture each tooth was recorded in Newton. Results: The highest value was found in samples without preparation 1009.68±57.28 N, followed by TN group 979.04±31.16 N, while the lowest value was found in PTG 966.47±17.51N. There was no significant difference between different groups (p=0.118). Conclusions: The root canal taper did not exert a significant influence on the longevity or fracture resistance of the tooth.

Mostafa M.A. ELKHOLY

Omar Mahmoud NOURELDIN

Hala Fayek KHALIL

Shehabeldin M. SABER

Does reduced taper canal preparation increase the load capacity of endodontically treated teeth?

减少锥度根管预备是否会提高根管治疗后牙齿的承载能力？

Objectives: The aim of the study was to determine the dynamic cyclic fatigue resistance (DCFR) of R-motion file and Protaper Next file (PTN) by differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). Methods: R-motion file (25/.06), PTN file (25/.06) were used and divided into 2 groups (n = 28) according to the file type. DCFR was performed using an artificial canal. Files were allowed to work until separation. The numbers of cycles to failure (NCF) and the time to fracture (TTF) were calculated. The files were subjected to DSC and SEM. Results: R-motion files had higher NCF and TTF compared to PTN files. SEM examination showed that all files showed ductile fracture. DSC of the R-motion file displayed Austenitic phase at body temperature) 37 ˚C) while PTN file failed to demonstrate any peaks within the applied heat range. Conclusions: R-motion files had higher CFR and TTF than PTN files. Conclusions: R-motion files had higher CFR and TTF than PTN files.

Rahma Mohamed ABDELSHAFY

Abeer Hashem MAHRAN

Mahmoud Mohamed FAHIM

Comparative study of dynamic cyclic fatigue resistance of two files with different kinematics

两种不同运动学文件动态循环疲劳抗性的比较研究

Objectives: The aim of this study is to determine which type of vertical relationship (between molar apices and the sinus floor) is correlated with the most favorable bone to implant contact (BIC). Methods: The CBCT database of the Faculty of Dental Medicine was used for datasets. For each dataset, a prosthetically-driven virtual implant placement was placed in the remaining interradicular bone. Potential BIC was measured using two different implant macrogeometries (straight and tapered). Results: The study included 20 maxillary molars with divergent root anatomy: 90% of the molars had a type II vertical relationship with the sinus floor, while only 10% had type III. Mean pBIC surface for second molars was significantly higher for straight implants compared to tapered implants. However, no significant differences in BIC% means between straight and tapered implants for any of the comparisons was found. Conclusions: Implant macrogeometry was found to have an impact on achieving higher pBIC values in certain situations, such as for second molars and type II relationship with the sinus floor. The study highlights the need for incorporating 3D software analysis in pre-operative surgical planning.

Nawal BABA

Nabil GHOSN

Abdel Rahman KASSIR

Lara NASR

Gabriel MENASSA

Carole CHAKAR

Bone to implant surface contact as a criterion for immediate implant placement with simultaneous sinus augmentation in the upper molars interradicular bone: A radiological CBCT study

上颌磨牙根间骨中即刻种植与同期上颌窦提升的骨-种植体表面接触作为评价标准：一项放射学CBCT研究

Publication Information	Publisher: Saint Joseph University of Beirut, Faculty of Dental Medicine，Publishing cycle: ，Journal Type: journal，Open Access Journals: No
Basic data	Year of publication: 2022，Proportion of original research papers: ，Self Citation Rate:， Gold OA Rate:

International Arab Journal of Dentistry

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Assessment and quantification of the microbial flora in the output water of two types of dental chairs: A comparative study

A comparison between the flexural strength of milled, conventional, and carbon fiber PMMA for interim implant supported fixed complete dentures: An In vitro study

Does reduced taper canal preparation increase the load capacity of endodontically treated teeth?

Comparative study of dynamic cyclic fatigue resistance of two files with different kinematics

Bone to implant surface contact as a criterion for immediate implant placement with simultaneous sinus augmentation in the upper molars interradicular bone: A radiological CBCT study

Assessment and quantification of the microbial flora in the output water of two types of dental chairs: A comparative study

A comparison between the flexural strength of milled, conventional, and carbon fiber PMMA for interim implant supported fixed complete dentures: An In vitro study

Does reduced taper canal preparation increase the load capacity of endodontically treated teeth?

Comparative study of dynamic cyclic fatigue resistance of two files with different kinematics

Bone to implant surface contact as a criterion for immediate implant placement with simultaneous sinus augmentation in the upper molars interradicular bone: A radiological CBCT study