Volume-6, Issue-12, December 2020

Abstract

Objective: The aims of this study isto evaluate the inter-premolar width changes in the mandible using three different commercial orthodontic arch wires. 

Subjects and methods: Thirty patients including both males and females have been allocated in this study. Three orthodontic wires including NiTi, copper NiTi, and Beta-Titanium wires had been used. A special observational technique including cbct had been used to make an evaluation for the interpremolar width before and after the aligning stage. 

Results: The results showed a highly significant increase in post-treatment inter premolar width in CNA and NITI groups; compared to Cu NITI group; with highly significant statistical difference (p < 0.01 respectively). 

Conclusion: The present study showed that there is a high significant increase in the inter-premolar width in the mandible, when comparing the wires in the groups (NiTi, CNA, and copper niti). Also, the gender of the patient does not seem to have an impact of the gender on post-treatment efficacy of each wire.

Keywords: Mandible, Commercial Arch Wires, NiTi, copper NiTi, Beta-Titanium wires.

References

Keywords: Mandible, Commercial Arch Wires, NiTi, copper NiTi, Beta-Titanium wires.

Abstract

The world is witnessing an invasion from a new corona virus, which resulted in more than one million of deaths. Most of the sectors such industrial, economy, and tourism are facing a crisis, hence the workers in the field of medicine, considered to be the barrier to fight this invasion. This new virus seems to have two main transmission routes: direct and contact, which it will open a high chance of infection among professional health providers, especially, surgeons and dentists. Maxillofacial and dental surgeons, considered to be essential professional health experts that perform, multiple surgeries and dental procedures every day, consequently, these professions will exhibit a high risk of getting infected by Covid19, due to that, this review article aimed to discuss the possible ways that it may help in optimizing the level of infection control.

Keywords: Covid 19, corona virus, Maxillofacial Surgeries, health providers, dental surgeons.

References

Keywords: Covid 19, corona virus, Maxillofacial Surgeries, health providers, dental surgeons.

Abstract

In this study, ginkgo powder was used as the research object, and neutral protease and flavor protease were selected to study the degree of hydrolysis of ginkgo protein. Using single factor test and orthogonal test, the results show that the addition amount of neutral protease is 1.6mg/ml, pH is 7.0, enzymolysis temperature is 44oC, and the reaction time is 4h, the best hydrolysis degree is 4.68%; flavor; The added amount of protease is 7.2mg/ml, pH is 6.5, enzymolysis temperature is 55oC, and the reaction time is 6h. The best hydrolysis degree is 24.95%; finally, the ginkgo polypeptide is obtained by separation and purification by 3kDa filter membrane. The yield rate was 8.73%, and the obtained filtrate was concentrated by a rotary evaporator to prepare a polypeptide concentrate.

Keywords: Ginkgo peptide; Enzyme hydrolysis; Membrane separation and purification.

References

Keywords: Ginkgo peptide; Enzyme hydrolysis; Membrane separation and purification.

Abstract

The demands for orthodontic treatment are in continuous increasing, hence producing an ideal treatment plan need to cover all stages of the treatment carefully, especially the retention and stabilization stage. As, any changing in the arch width through changing the inter-molar width will lead to impair the stabilization of the arch and will lead to relapse. Due to that, the present study performed to evaluate the inter-molar width of the mandible using three different commercial orthodontic wires. Thirty patients had been allocated in this study, using a cone beam computed tomography to create an assessment for the inter-molar width. It concluded that there is an increase in the inter-molar width between pre-treatment and after finishing of aligning stage, also there is a highly significant increase in post-aligning stage between the three groups.

Keywords: Inter-molar width changes, Orthodontic Arch Wires, retention stage, stabilization stage, NiTi wires.

References

Keywords: Inter-molar width changes, Orthodontic Arch Wires, retention stage, stabilization stage, NiTi wires.