Background: The worldwide incidence of oral health among the autistic children has been found to be poor for various reasons. Risk of dental caries and gingivitis is expected to be higher in these patients due to improper brushing and flossing because of the difficulties of the trainers and parents encounter when they brush the children’s’ teeth. They tend to pouch food inside the mouth instead of swallowing it due to poor tongue coordination, thereby increasing the susceptibility to caries. Communication and behavioural problems pose the most significant challenges in providing oral care. Objective: The purpose of this study was to examine the oral health status and dental needs of autistic children in Bangladesh. Methods: This case control study was carried out among 2-13 years old children with special health-care needs. The study was conducted in the Department of Orthodontics of Bangabandhu Sheikh Mujib Medical University (BSMMU), Dhaka from the period of August to December 2017. A total of 130 children having ASD and aged between 2 -13 years were taken as cases and 182 gender-matched healthy children were taken as control. Cases were taken from BSMMU and other two autism centres. Controls were taken from a neighborhood school. Oral lesions were evaluated using standard international diagnostic criteria. Association of food habits and oral hygiene status were assessed among the study subjects. Dental status was evaluated using DMFT/dmft index according to the World Health Organization oral health surveys. Gingival health status were assessed using the Oral hygiene index of Loe and Silness, while the papillary bleeding index were assessed by employing the papillary bleeding index of Miihleman to ascertain the oral hygiene status. Results: The mean age was found 8.72±3.40 years in the case group and 10.26±1.36 years in control group. Chi square test showed significant associations with the participants’ consumption of having more soft foods, presence of papillary bleeding and presence of decayed teeth with their oral hygiene status. Conclusion: As data regarding oral health among autistic children are not available presently in Bangladesh. So, it is difficult for comparison of children having disabilities with those of healthy group. For planning and providing effective dental health care services for the children with autistic disorders. Bangladesh Med Res Counc Bull 2020; 46(2): 90-98

The decision forutilization of a space of a retained deciduous molar to alleviate crowding in late mixed dentition is one of the critical aspects in orthodontic treatment.Hence, the aimof the treatment hereis to use the extraction spaces properly to relieve severe crowding and align both the arches to the point where a stable overjet/overbite exist. This case report presenting a 13-year-old female adolescent with severe crowding in both upper and lower jaw and a convex profile. Although she was initially anxious to extract her teeth to treat her case but also she was looking for desirable results. The case was later treated in a conventional orthodontic approach with extraction ofthree 1stpremolars. It was quite challenging to make the best use of the space of missing lower right 2nd premolar after extraction of deciduous second molar on that sideto relieve severe crowding. However; at the end of the treatment, the patient expressed satisfaction with the results- proper bite, smile and most importantly esthetics. This case report demonstrates successful treatment of an adolescent patient with severe crowding by proper utilization of the extraction spaces. Bangladesh Journal of Medical Science Vol.19(4) 2020 p.763-768

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Background: Light-cured bonding systems have been widely accepted among orthodontists. Various light curing units are available now. Recently, the light emitting diode (LED) has been introduced alongside halogen light curing units. There is lack of information on the advantages and disadvantages of different light curing systems. The aim of this in vitro study was to compare the shear bond strength of orthodontic brackets and adhesive remnant index (ARI) of an adhesive cured with two different orthodontic light sources i.e. LED and halogen. Methods: Forty four (22 in each group) extracted human premolars without any defects were etched with 37% phosphoric acid and cleansed with water spray and air dried. The sealant (Ortho Solo) was applied on the tooth surface and the brackets were bonded using adhesive (Enlight). Adhesives were cured with Halogen (Litex) and LED (D-LUX) for 40 seconds. Then the specimens were debonded later using a universal testing machine, with crosshead speed of 0.2 mm/min until the brackets were detached. Adhesive remnant index (ARI) scores were assessed under stereomicroscope at ×10 magnification. Results: The shear bond strength in Halogen group was 19.73 ± 3.44 MPa and in the LED group 20.81±3.02 MPa which is little higher than halogen group. The proportion of being adhesive remaining index for ARI Score 1 in Halogen group was 5 (22.7%) and in LED group 7 (31.8%). While ARI Score 2 in the Halogen group was 13 (59.1%) compared to LED group 8 (36.4%). However, ARI Score 3 in Halogen group was 4 (18.2%) and in LED group 7 (31.8%). The overall model showing no significant difference. Conclusion: Within limitations, this in vitro study showed the shear bond strength of orthodontic adhesives cured with a LED was statistically equivalent to those cured with a halogen light curing unit. There were significant differences in the ARI scores of the light-curing units tested. LED light-curing units can be suggested for the polymerization of orthodontic bonding adhesives because it showed a balanced effect on ARI index. Bangladesh Med Res Counc Bull 2019; 45: 17-22

:Objectives : To study the variations in arch length among different classes of dento-alveolar malocclusion in the permanent dentition. Materials and Methods: Both male and female Bangladeshi subjects with permanent dentition who attended during 1st July 2007 to 1st January 2011 to the Department of Orthodontics , BSMMU for treatment were included in this study. Dental arch length were measured from dental casts of the permanent dentition of 96 Bangladeshi subjects of which 48 male, 48 female, 24 class 1, 24 class 2 div. I, 24 class 2 div. II, 24 class III. Arch length was measured by adapting a length of brass wire (diameter 0.5 mm) on the maxillary and mandibular arches.