Day 1 :
Keynote Forum
Yosef Wakjira
Student, National Taiwan University of Science and Technology.
Keynote: The Optimum Stress Distribution Under Different Implant Thread types and Osseointegration Conditions: A Finite Element Analysis
Biography:
Yosef Wakjira is a current graduate student at National Taiwan University of Science and Technology in Taiwan. He is studying his Masters in the Department of Mechanical Engineering and his research focuses on Dental Implant Biomechanics. He served as as Assistance Lecturer in Ethiopia.
Abstract:
The selection of optimum implant thread design plays a crucial role in the treatment. This study was undertaken to (i) Identify an optimum thread-shape design (ii) investigate the effects of various implant thread designs on stress distribution inside the bone implant-interface. (iii) Investigating Static, dynamic and fatigue behaviors of implants. Through FEA, Five implants with different thread shape designs were considered. The dimensions of implants were according to mechanical standards of commercial dental implant thread design. The implant modeling was done with the CATIA software & simulated in Abaqus software. Vertical loads of 150N were applied. The three dimensional model of bone is taken using Cone Beam Computerized Tomography (CBCT) and considered as Anisotropic and Osseo integration were simulated at various degrees. The FEA results demonstrated Von Mises stresses were more distributed in the mesiodistal direction. Maximum stresses were concentrated at the cortical bone and transferred to the first thread of the implant. Minimum Von Mises stresses were observed with Square thread design at the cortical bone. The Simulation shows that the least stresses were observed at the cancellous bone and maximum at the implant. The use of different thread designs and various osseointegration conditions did not affect the stress distribution patterns in the supporting bone. Buttress threads showed the most favorable results according to the predicted values of von Mises equivalent stress, pressure, different shear stresses, and micromotion.
- Dental Public Health
Session Introduction
Dina
Phd, Faculty of Dentistry, Cairo University-Egypt
Title: : Palatally erupted maxillary lateral incisors may be a causative factor of mandibular deficiency
Biography:
Dr Dina graduated from Faculty of Dentistry Cairo University in 2002 with high honors and 2nd ranking. She completed her residency and then enrolled in the department of Orthodontics as a resident for 3 years during which she completed her Master Degree. She then registered for her PhD and was awarded the degree in 2013. She has extensively lectured students at the dental school and has attended several local and international conferences/lectures.
Abstract:
The aim of this study was to evaluate the influence of palatally displaced maxillary incisors on mandibular growth in a group of Egyptian patients.
Material and Methods: The sample consisted of the digital lateral cephalograms of 24 patients with age range of 15-30 years during the permanent dentition stage. The radiographs were selected from the patient database of private practice in Cairo. The sample was divided into 2 groups each consisting of 12 patients. Group A had palatally displaced maxillary lateral incisors without crossbite. Group B had palatally displaced maxillary lateral incisors with crossbite. Cephalometric measurements were used to assess the anteroposterior skeletal malocclusion (SNA, SNB, ANB, Witts appraisal). Independent samples t-test was performed between two groups.
Results: Cephalometric measurements revealed statistically significant differences between groups A and B. Group A had skeletal Class II with retrognathic mandible while group B had skeletal Class I pattern with normal mandibular position. The maxilla was well positioned in relation to the cranial base. No statistically significant difference between genders was evident.
Conclusion: Palatally displaced maxillary lateral incisors without crossbite cause restraining effect on normal mandibular growth which results in skeletal Class II with mandibular deficiency.
- Orthodontics
Session Introduction
Negin Aliyari
DDS, Zanjan University of Medical Sciences School of Dentistry.
Title: Effects of cell phone use on salivary MDA (malondialdehyde) and LDH (lactate dehydrogenase) level in 18-40 years-old adults
Biography:
Negin Aliyari has completed her DDS at the age of 24 years from Zanjan University of Medical Sciences School of Dentistry. She perused many articles published from 2010 to 2019, about the effects of mobile phone usage on parotid gland secretion and recently has written a systematic review article about the effects of mobile phone radiation on human body. She has her passion of improving the oral healthcare. In her opinion, it’s really important to diagnose an oral lesion as soon as possible. According to various diagnostic application of saliva, it can offer distinctive advantages over serum.
Abstract:
As far as the increasing use of mobile phone as a source of non-ionizing electromagnetic radiation is concern, many side effects of this integral part of life is known on various human’s body systems and the oral cavity. Malondialdehyde and Lactate dehydrogenase are two biomarkers in saliva as oxidative stress indicators considered in this study. The existence of controversial results of many studies is another cause of this topic choice.
Unstimulated saliva sampling from 72 subjects in 3 groups with different mean time talking on the phone per day was done by spitting method. Then, the extracted saliva samples were imported to the MDA (E1371Hu) and LDH (E0747Hu) ELISA kit. Finally, the data were analysed by appropriate statistical tests. The mean concentration of MDA in group A, B and C was 22.37 11.3, 22.72 , and 21.16 . The mean LDH concentration of these 3 groups was 283.52 , 363.85 , 241.55 , respectively.The mean MDA/LDH concentration of salivary samples between the specified groups has been showed no significancy (p.value>0.05). There is no significant relationship between Salivary MDA/LDH concentrations and mobile phone talking time in 18 to 40 years-old adults. In other words, the exposure of human to cellphone radiations does not alter salivary MDA/LDH levels. However, we reported a strong relation between MDA and LDH concentration as two stress oxidative biomarkers.
- Endodontics
Session Introduction
Richard A Miller
DDS, Ohio State University
Title: Treating HALITOSIS: Myths, Cures, & Profit
Biography:
Richard A Miller DDS received his dental degree from Ohio State University in 1973. Since 1993, he has maintained a private practice specializing in the elimination of chronic halitosis. He has authored two books, the latest being Beating Bad Breath-The Cure.
As Director of the National Breath Center in Falls Church, VA, he has developed protocols for the diagnosis and treatment (cure) of halitosis. He has lectured at 9 major dentl meetings, including the Hinman Meeting, Dallas Mid-Winter, British Dental Association, and the American Academy of Cosmetic Dentistry
Abstract:
Halitosis is estimated to afflict 20-50% of the population and is the 3rd most common reason that brings people into a dental office. Research has shown that 85-90% of all bad breath originates in the oral cavity. Yet, the most common outcomes for patients seeking relief from their dentist is referral to a physician, referral to a periodontist, or the sale of oral care products. None of these outcomes eliminates bad breath. The research facts clearly show these approaches are highly unlikely to affect the problem let alone cure it.
The research on halitosis, extending over the last 100 years, clearly indicates that this problem can be eliminated with professional dental treatment. No longer using mouthwash cover-ups, nor the professional strength type that temporarily kill bacteria, the National Breath Center® has pioneered an approach that can be followed in every dental office with minimal investment in time and training and has been tested over 25 years with thousands of patients.
This seminar will provide the attendee with the information to implement the successful program developed at the National Breath Center into their own practice and ways will be given to create this total hygiene-driven practice.
Some of the topics covered will be:
Why Treat Halitosis?
A Cure, Not Just A Treatment
Why Is No One Curing Bad Breath?
Halitosis Cure and Prevention Is Values Driven
Diagnosis and Treatment of Halitosis
- Prosthodontics and Periodontics
Session Introduction
Pooya Fadaei
DDS, Yazd University of Medical science.Iran.
Title: Effect of Co2 laser (10.6 µm) and Remin Pro on remineralization of enamel white spot lesions
Biography:
Pooya Fadaei has completed his DDS at the age of 25 years from Yazd University of Medical science.Iran. He has published 1 paper in reputed journals and has another paper for submission.
Abstract:
Background and Aims: This study investigated the combined effect of Co2 laser irradiation and Remin Pro paste on treatment of enamel white spot lesions (WSLs).
Materials and Methods: Seventy-eight intact premolars were randomly assigned into six groups and then stored in a demineralizing solution to create WSLs. Afterwards the teeth in group 6 (negative control) remained untreated while groups 1 and 4 were exposed to Co2 laser irradiation (20 Hz, 1W, 30 seconds) and Remin Pro paste, respectively. In groups 2 and 3 teeth were exposed to laser either before (group 2) or after (group 3) Remin Pro application. Teeth in groups 1 to 5 were then immersed in artificial saliva for 90 days while subjected to fluoride mouthwash and weekly brushing. Finally, teeth were sectioned and Vickers microhardness was measured at the enamel surface and at 50,100 and 150μm from the surface. One sample of each group was also examined with scanning electron microscope (SEM). Data were analyzed by two-ways Analysis of variance (ANOVA) and Tukey test. The significance was set at 0.05.
Results: Laser irradiation followed by Remin Pro application (group 2) caused a significant increase in total WSLs’ microhardness compared to laser alone (group 1) and control groups (p<0.05). Microhardness at depths of 100 and 150 μm was also significantly greater in group 2 compared to those of group 3 and control groups (p<0.05).
Conclusion: Combined application of Co2 laser with Remin Pro paste, when laser is irradiated before the paste, is suggested for rehardening of WSLs.