Introduction: Direct and indirect bonding has revolutionized clinical orthodontics by reducing chair-side time and enhancing patient comfort. Clinicians often hesitate to bond molars due to ambiguity on shear bond strength. This study was conducted to compare shear bond strengths of two commercially available bondable molar tubes. And asses mesh if the mesh design had a role to play in differences in shear bond strength. Materials & Method: 30 extracted maxillary molars were divided into Group I and II (n=15).Group I bonded with Victory series MBT (3M Unitek). And Group II bonded with Ortho classic proprietary Pad- Lok (Navy orthodontics). Teeth were mounted on a jig and Shear Bond Strength was evaluated on an Instron universal testing machine at a cross head speed of 1mm/minute. They were also subjected to scanning microscopic examination to check the base pattern. Result: Shear bond strength of navy orthodontic tubes were (18.0675+/- 4.0187 MPa) was significantly higher than 3M victory series (8.93 +/2.493MPa). Unpaired T-test shows a higher significant difference in SBS between two groups at 1% of significance. SME showed that navy orthodontic tube base was pad-lock mesh design, while 3M was a single mesh base design. Conclusion: 3M victory series molar tube exhibited a near ideal while other sample showed far higher shear bond strength than recommended. Higher values may result in enamel fracture.

Introduction: Fixed orthodontic procedures such as separator placement, archwire placement andactivations, application of orthopaedic forces, and debonding of brackets produce pain in patients.This study was conducted to assess pain and oral health-related quality of life among patientsundergoing orthodontic treatment. Methods: This descriptive cross-sectional study was conducted among 152 orthodontic patients ofa teritary care center from January 2019 to October 2019 after receiving ethical approval from theInstitutional Review Committee (Ref. no. 2311201813). Convenience sampling method was done toselect the participants. Oral health-related quality of life using “Oral Health Impact Profile-14” andpain experienced during the first month of fixed orthodontic treatment were assessed. Data analysisfor calculation of frequency and proportion was done in Statistical Package of Social Sciences. Results: Mean pain score of the study participants was 5.05±2.07 and their mean oral health impactwas 12.71±7.27. Most of the study participants 86 (56.58%), had experienced moderate pain due toorthodontic treatment. Out of the reported impacts, 134 (88.2%) had painful aching in mouth and 127(83.6%) had difficulty during eating. Least impact was seen in alteration of taste 35 (23%). Conclusions: The pain intensity experienced by patients was variable. Most participants hadmoderate pain but few patients perceived no pain at all. The participants had at least one or otheroral health impacts due to fixed orthodontic treatment. Orthodontists should counsel the patientsregarding possible discomfort so that there is no discontinuation of treatment due to pain.

Introduction: Pulp stones are foci of calcification in the dental pulp. During the orthodontic tooth movement, a complex series of tissue reaction occurs. Studies show that the orthodontic force application may cause pulpal changes like pulpal calcifications. Hence; we assessed the prevalence of prevalence of dental pulp stones in patients undergoing orthodontic treatment. Materials and Method: A total of 50 patients who were scheduled to undergo non-extraction orthodontic treatment were included. Pre-treatment and Post-treatment radiographs were taken in all the patients. Evaluation of the permanent molars (maxillary and mandibular) was done, both pre-treatment and post-treatment. Interpretation of the radiographs was done by skilled and experienced oral radiologists. Diagnosis of pulp stones was done when definite radiopaque bodies as dental pulp stones were noted as present or absent. All the results were recorded in Microsoft excel sheet. Results: At pre-treatment time, prevalence of pulp stones was found to be 26 percent, while at post-treatment time, the overall prevalence of pulp stones was found to be 48 percent. Significant results were obtained while comparing the pretreatment and post-treatment prevalence of pulp stones. Conclusion: Formation of pulp stones might be triggered under the effect of orthodontic trea

Background: Mandibular retrusion is the main cause of Skeletal Class II malocclusion characterized by skeletal retrusion of mandible with skeletal or dentoalveolar protrusion of maxillary. Objectives: This study was conducted to evaluate effect of treatment with twin-block appliances on pharyngeal dimensions. Methodology: This study was conducted in in the Department of Orthodontics & Dentofacial Orthopedics in Kathmandu Medical College. Twenty patients of age group 7 to 14 years with skeletal class II malocclusion with mandibular retrusion were selected. Variables evaluated were depth of nasopharynx; height of nasopharynx; depth of oropharynx; depth of hypopharynx; soft palate length; soft palate thickness and soft palate inclination. The lateral cephalograms were obtained for all subjects before the start of treatment and after a follow-up period of approximately three months in treatment. Results: Results showed that depth of nasopharynx increased by 1 mm, height of nasopharynx increased by 0.78 mm, depth of nasopharynx increased by 1.97 mm, depth of hypopharynx increased by 0.79 mm, soft palate length decreased by 4 mm, soft palate thickness increased by 2 mm and soft palate inclination decreased by 7.01 mm. The results for depth of pharynx and soft palate thickness were statistically significant. Conclusion: This study concluded that the use of twin block appliance for class II patients corrects sagittal dimension of oropharynx and hypopharynx. Early intervention for mandibular retrognathism in class II malocclusion helps enlarge the airway dimensions and decrease potential risk of obstructive sleep apnea syndrome for growing patients in the future.

Objective: The objective of the study undertaken was to evaluate if geometric and mathematical relationship of Nose and Nasal Architecture of female population of three ethnic groups of Nepal . Methods: Sample consisted total of 135 Nepalese females in age group of 18-25 years belonging to three ethnic groups of Nepal . Each group comprised of 45 females. For the study extra oral facial photographs were obtained in Frontal View, Profile View ,Sub MentoVertex View (Basal View). Evaluations were done using the Goode Method and Fomans Method. Results: Nasal Projection in tarai region females had maximum projection of the nose (61% ± 8) followed by Hilly females (60% ± 5.50) and least projection of nose was found in mountainous region females (50% ± 7). Nasal Projection showed no significant difference in hilly and tarai Nepalese females but shows significant difference between hilly and mountainous region and mountainous region and tarai females. Analysis of nasal architecture revels that mountainous region nose were shorter and broader than hilly and tarai region females Conclusions: Evaluation of nasal architecture reveals that shape of nasal dorsum was straight in all three groups of Nepalese females studied. Columella to Lobe relationship showed that Columella was longest in tarai region females followed by hilly region females and shortest in mountainous region females.