Reshma Mohan
@drreshma.squarespace.com
Assistant Professor, Department of Orthodontics and Dentofacial Orthopaedics
Dr Reshma Mohan
Scopus Publications
Scholar Citations
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Scopus Publications
Reshma Mohan and Ravindra Kumar Jain
Maad Rayan Publishing Company
Background. The present study evaluated and compared the surface roughness (SR) of five different types of orthodontic archwires made by two different manufacturers. Methods. In this in vitro study, 10 samples of five different archwires comprising of three types of shape memory wires, SmartArch (Ormco), Damon (Ormco), Heat-activated NiTi (HANT) (G&H Orthodontics), Stainless Steel wire (SS) (Ormco), and conventional NiTi (G&H Orthodontics) were examined by atomic force microscopy (AFM). The processing of 3D images was carried out using Gwyddion software, from which the root mean square (rms), the roughness average (Ra), and the maximum height (mh) of the scanned surface profile were documented. The data were analyzed with one-way ANOVA followed by post hoc Tukey tests for intergroup comparisons. Results. The mean SR of SS wires was the least (Ra=8.70±0.17), followed by NiTi wires (10.29±2.00) with a significant difference between them (P<0.05). Among the three shape-memory wires, the HANT wires had the least SR (Ra=22.97±16.56) compared to SmartArch wires (Ra=25.55±3.78) and Damon wires (Ra=25.67±4.54), but the difference was not significant (P>0.05). Conclusion. The SS wires by Ormco had the least SR followed by G&H orthodontics NiTi wires. The three different shape-memory wires tested had no significant difference in SR values.
Reshma Mohan, Ravindra Kumar Jain, and Arthi Balasubramaniam
Universidade Estadual de Campinas
Buccolingual position of teeth could affect the prevalence of alveolar bone defects. Presence of alveolar defects may have a deleterious effect on orthodontic treatment. The aim was to assess the prevalence and extent of dehiscence and fenestration in Class I hyperdivergent subjects and correlate it with buccolingual inclinations(BL) of maxillary first molar teeth. Methods: This retrospective study involved 80 CBCTs of class I hyperdivergent subjects divided into two groups - group A (n=33) buccolingual inclination >9º and group B (n=47) buccolingual inclination <9º. Prevalence and extent of alveolar bone dehiscence and fenestrations were measured in CBCTs using OSIRIX Lite software. Descriptive statistics, Mann Whitney U test and Spearman correlation were done for evaluating intergroup differences and correlation with Buccolingual inclination. Results: Overall prevalence of dehiscence and fenestration in maxillary first molars was 60.95% and 5% respectively. In the buccal alveolar bone, prevalence of dehiscence was highest in group A (84.6%) for 16 and in the lingual alveolar bone prevalence of dehiscence was highest in group B (71.4%) for 26 . On intergroup comparison, the extent of lingual alveolar bone dehiscence (26) in group B was significantly higher (p value <0.05) than in group A. No significant correlation between the extent of dehiscence and fenestration with buccolingual inclination of molar teeth was noted. Conclusion: Molar teeth with BL inclinations of more than 9º had higher prevalence of dehiscence on the buccal side and molar teeth with BL inclinations less than 9 degrees had more dehiscence on the lingual side. But no significant correlation of BL inclination with prevalence and extent of dehiscence and fenestration was noted.
Reshma Mohan, Ravindra Kumar Jain, and Nivethigaa Balakrishnan
GP Innovations Pvt. Ltd.
The present study aims to assess the correlation between maturation stages of the middle phalanx of the third finger and calcification stages mandibular of the third molar in 9-16 years old children in the South Indian population. A total of 39 subjects between the age of 9-16 years were included for this study. Their pretreatment digital panoramic and hand-wrist radiographs were retrieved from the DIAS software provided by Saveetha Dental College and Hospital, Chennai, TamilNadu, India. These records were analyzed with the help of Demirjian index, used for mandibular third molar maturation stage, and Modified MP3 method, used for Middle phalanx maturation stage. Pearson's Chi-Square tests were done to analyze the association between Mp3 stages and mandibular third molar calcification stages. The statistical tests were performed in SPSS software. The results of this study showed that there is a statistically significant association between Demirjian index and modified MP3 stages in both females (p<0.002) and males (p<0.000). Within the limitations of this study, it was concluded that calcification stages of the lower third molar could be used as a supportive tool to assess maturation. As third molars are known to have many alterations, individual variation should be taken under consideration.