Dental Materials
Sherin Johnson; Sameena Begum; SM Laxmikanth; Raghunandan Chunduri; Khadeer Riyaz; Anju Varughese
Abstract
Aim: This study evaluated the effect of physical and chemical sterilization techniques on the fracture resistance of mini-implants.Methods: Thirty-two titanium mini-implants of 1.5 x 8 mm were randomly divided into four groups: control, steam sterilized, dry heat sterilized, and chemically sterilized. ...
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Aim: This study evaluated the effect of physical and chemical sterilization techniques on the fracture resistance of mini-implants.Methods: Thirty-two titanium mini-implants of 1.5 x 8 mm were randomly divided into four groups: control, steam sterilized, dry heat sterilized, and chemically sterilized. The samples were then tested in the air for fracture resistance using a universal testing machine. A tangential load was applied to the head of the mini-implant with a 1 mm/min crosshead speed after blocking each of them in the machine. Also, the maximum load was recorded previous to screw fracture. he Kruskal-Wallis test and Mann-Whitney post hoc test were used for data analysis.Results: The results of this study demonstrated the mean fracture resistance difference between the four groups was statistically significant at p<0.001. Moreover it was showed the control group had significantly higher mean fracture resistance compared to dry heat and chemically sterilized groups at p=0.001 and p=0.009 respectively. This was followed by the stem sterilized group demonstrating significantly higher mean fracture resistance as compared to dry heat and chemically sterilized groups at p=0.001 and p=0.01 respectively. Later, the chemically sterilized group also showed significantly higher mean fracture resistance as compared to the dry heat group at p=0.002. However, no significant difference was observed between the control and stem sterilized groups (p=0.29).Conclusion: The steam sterilized group demonstrated the highest fracture resistance that was followed by the chemically sterilized group, and the least with the dry heat sterilized group.
Dentofacial Orthopedics
Farzin Heravi; Farzaneh laalalizadeh; Majid Ghanbarzadeh; Mahsa Ghorbani
Abstract
Aim: Maxillary transverse deficiencies pose significant challenges in orthodontics, necessitating effective treatment methods. Traditional approaches like rapid maxillary expansion (RME) have demonstrated limitations, especially in skeletally mature patients. Skeletal anchorage-based expansion methods, ...
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Aim: Maxillary transverse deficiencies pose significant challenges in orthodontics, necessitating effective treatment methods. Traditional approaches like rapid maxillary expansion (RME) have demonstrated limitations, especially in skeletally mature patients. Skeletal anchorage-based expansion methods, such as miniscrew-assisted rapid maxillary expansion (MARME), have emerged as viable alternatives, offering advantages in terms of reduced dental side effects and improved stability.Report of a Case: A 14-year-old female presented with a severely constricted maxillary arch and intricate occlusal issues. This case report details the utilization of MARME as a treatment modality. Miniscrews were strategically placed by an orthodontist specialist, and the expansion process was carefully monitored. Post-treatment outcomes revealed a significant increase in midpalatal suture opening width, showcasing the effectiveness of MARME. Cone beam computed tomography images demonstrated a notable expansion of the transverse dimension, leading to improved occlusal relationships.Conclusion: Skeletal anchorage-based expansion, particularly MARME, stands out as a preferred method for addressing maxillary constriction in adolescents. This case serves as an illustration of the feasibility and distinctive advantages of Temporary Anchorage Devices (TADs) in the context of maxillary expansion for skeletally mature patients.
Atefe Saffar Shahroudi; Behrad Tanbakuchi
Abstract
Context: Temporary anchorage devices (TADs) have been introduced to orthodontic treatment for enhancing anchorage control. It is claimed that they are not disposable and can be used several times after sterilization process. However, the question is whether this repeated sterilization has any effect ...
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Context: Temporary anchorage devices (TADs) have been introduced to orthodontic treatment for enhancing anchorage control. It is claimed that they are not disposable and can be used several times after sterilization process. However, the question is whether this repeated sterilization has any effect on the properties of these devices. This study was done to review the available articles that had addressed various aspects of this issue.Evidence Acquisition: The authors searched several electronic data bases including PubMed, Google Scholar, Scopus and Embase with several key words related to orthodontic temporary anchorage devices and sterilization. The relevant articles were reviewed and categorized in the following subjects: mechanical properties, primary stability and clinical success, and histologic and microscopic characteristics. Results: Sterilizing the temporary anchorage devices seems not to affect the mechanical properties of these devices.
Conclusions: In terms of primary stability, and clinical success, very few studies are available. Histologic and microscopic evaluations showed some alteration in the surface characteristics of TADs including some mineral precipitation.
