Basanta Shrestha - Academia.edu (original) (raw)

Uploads

Papers by Basanta Shrestha

Research paper thumbnail of Prevalence of Malocclusion among High School Students in Kathmandu Valley

Research paper thumbnail of Orthodontic Treatment of Anterior Dental Open Bite with Drawbridge Effect: A Case Report

Orthodontic Journal of Nepal, 2013

A young lady presented to Department of Orthodontics with a chief complain of gap between upper a... more A young lady presented to Department of Orthodontics with a chief complain of gap between upper and lower front teeth. On analysis she had Class I dental and skeletal malocclusion with proclined and forwardly placed incisors, and open bite. The treatment was carried out with extraction of all four first premolars and retraction was done with the help of mini-implant screws. Successful correction of open bite was achieved with “drawbridge effect”. DOI: http://dx.doi.org/10.3126/ojn.v3i1.9286 Orthodontic Journal of Nepal, Vol.3, No.1, 2013: 69-72

Research paper thumbnail of Shear bond strength of a bracket-bonding system cured with a light-emitting diode or halogen-based light-curing unit at various polymerization times

Clinical, cosmetic and investigational dentistry, 2018

To determine and compare the shear bond strength (SBS) of bracket-bonding system cured with light... more To determine and compare the shear bond strength (SBS) of bracket-bonding system cured with light-emitting diode (LED) and halogen-based light-curing unit at various polymerization times. Ninety six human maxillary premolar teeth extracted for orthodontic purpose were divided into four groups, according to the light-curing unit and exposure times used. In the halogen group, the specimens were light cured for 20 and 40 seconds. In the LED group, the specimens were light cured for 5 and 10 seconds. Stainless steel brackets were bonded with Enlight bonding system, stored in distilled water at 37°C for 24 hours and then submitted to SBS testing in a universal testing machine at a crosshead speed of 0.5 mm/minute. Adhesive remnant index (ARI) was used to evaluate the amount of adhesive remaining on the teeth determined by stereomicroscope at 10× magnification. The highest mean SBS was obtained with the halogen 40 seconds (18.27 MPa) followed by halogen 20 seconds (15.36 MPa), LED 10 seco...

Research paper thumbnail of Mixed dentition space analysis among Nepalese Brahmins/Chhetris

BMC Oral Health, 2016

Background: Mixed dentition space analysis forms an important part of orthodontic diagnosis and t... more Background: Mixed dentition space analysis forms an important part of orthodontic diagnosis and treatment planning. Regression equations are widely used for mixed dentition analysis which can vary among races. This study aimed to find out the new regression equation in estimating the size of unerupted canines and premolars for Nepalese Brahmins/Chhetris. Methods: Hundred Nepalese Brahmins/Chhetris (50 males and 50 females) who met our criteria were selected among the patients attending to the Orthodontic OutPatient Department, Institute of Medicine, Kathmandu. The mesiodistal widths of all mandibular permanent incisors; maxillary and mandibular canines and premolars were measured and analyzed. The results were also compared with predicted values from the Moyers and the Tanaka and Johnston methods. Correlation and linear regression analyses were performed between the predicted and actual tooth sizes for Nepalese Brahmins/Chhetris and standard regression equations were developed. Results: No significant differences were observed when the sum of canine and premolars of one quadrant is compared between sides and sex. Significant and high positive correlations were found between the mandibular incisors and the combined mesiodistal widths of the canines and premolars for the maxillary (r = 0.72) and mandibular (r = 0.73) segments. Significant differences were observed between the measured values from this study and from Moyers (50 % and 75 % probability) and Tanaka-Johnston methods. Conclusions: The equations and charts commonly used for North American children (50 th or 75 th percentile) did not accurately predict for our sample, so new regression equations and tables were developed for Nepalese Brahmins/Chhetris children.

Research paper thumbnail of Maxillary Impacted Canines: A Clinical Review

Orthodontic Journal of Nepal, 2013

Impacted teeth are those with a delayed eruption time or that are not expected to erupt completel... more Impacted teeth are those with a delayed eruption time or that are not expected to erupt completely based on clinical and radiographic assessment. Palatal displacement of the maxillary canines is defined as the developmental dislocation to a palatal site often resulting in tooth impaction requiring surgical and orthodontic treatments. Impacted permanent maxillary canine occur in 1-2% of the population. The Occurrence of impacted permanent maxillary canines are; 85% palatal and 15% labial. The prevalence of palatally displaced canines (PDC) fluctuates between 0.8-5.2%. Palatally erupting or impacted maxillary canines occur twice often in females than males, and are five times more common in Caucasians than Asians. Of all patients with maxillary impacted canines, 8% have bilateral impactions.DOI: http://dx.doi.org/10.3126/ojn.v3i1.9285 Orthodontic Journal of Nepal, Vol.3, No.1, 2013: 63-68

Research paper thumbnail of Assessment of skeletal maturation with permanent mandibular second molar calcification stages among a group of Nepalese orthodontic patients

Clinical, Cosmetic and Investigational Dentistry, 2016

Background: Assessment of growth status of a patient is a key component in orthodontic diagnosis ... more Background: Assessment of growth status of a patient is a key component in orthodontic diagnosis and treatment planning for growing patients with skeletal discrepancy. Skeletal maturation based on hand-wrist radiograph and cervical vertebral maturation (CVM) are commonly used methods of growth assessment. Studies have shown that stages of dental calcification can also be used to assess skeletal maturation status of an individual, whereas other studies have suggested that the relationship between dental calcification and skeletal maturation should be interpreted with caution owing to racial variation. Objective: To evaluate the relationship between permanent mandibular second molar calcification stages and skeletal maturity assessed by CVM among a group of Nepalese orthodontic patients. Materials and methods: One hundred and sixty-eight digital radiographs (84 orthopantomograms and 84 lateral cephalograms) were obtained from the records of 84 patients who sought orthodontic treatment in Orthodontic and Dentofacial Orthopaedic Unit, Department of Dentistry, Institute of Medicine, Kathmandu. Two parameters were used in this study, namely, CVM stages from lateral cephalogram and Demirjian index (DI) stages from orthopantomogram. The evaluation of digital radiographs was carried out on a computer screen with a resolution of 1,280×800 pixels. The association between DI stages of permanent mandibular second molar and CVM stages was assessed. Results: A statistically significant association was found between DI and CVM stages for both male and female subjects with Pearson's contingency coefficient value of 0.751 and 0.766 for male and female subjects, respectively. Conclusion: Skeletal maturation can be reliably assessed with dental calcification stages of permanent mandibular second molar for Nepalese orthodontic patients.

Research paper thumbnail of Prevalence of Malocclusion Among Medical Students in Institute of Medicine, Nepal: A Preliminary Report

Orthodontic Journal of Nepal, 2013

DOI: http://dx.doi.org/10.3126/ojn.v1i1.9362 Orthodontic Journal of Nepal Vol.1(1) 2011: 24-27

Research paper thumbnail of Prevalence of Malocclusion among High School Students in Kathmandu Valley

Research paper thumbnail of Orthodontic Treatment of Anterior Dental Open Bite with Drawbridge Effect: A Case Report

Orthodontic Journal of Nepal, 2013

A young lady presented to Department of Orthodontics with a chief complain of gap between upper a... more A young lady presented to Department of Orthodontics with a chief complain of gap between upper and lower front teeth. On analysis she had Class I dental and skeletal malocclusion with proclined and forwardly placed incisors, and open bite. The treatment was carried out with extraction of all four first premolars and retraction was done with the help of mini-implant screws. Successful correction of open bite was achieved with “drawbridge effect”. DOI: http://dx.doi.org/10.3126/ojn.v3i1.9286 Orthodontic Journal of Nepal, Vol.3, No.1, 2013: 69-72

Research paper thumbnail of Shear bond strength of a bracket-bonding system cured with a light-emitting diode or halogen-based light-curing unit at various polymerization times

Clinical, cosmetic and investigational dentistry, 2018

To determine and compare the shear bond strength (SBS) of bracket-bonding system cured with light... more To determine and compare the shear bond strength (SBS) of bracket-bonding system cured with light-emitting diode (LED) and halogen-based light-curing unit at various polymerization times. Ninety six human maxillary premolar teeth extracted for orthodontic purpose were divided into four groups, according to the light-curing unit and exposure times used. In the halogen group, the specimens were light cured for 20 and 40 seconds. In the LED group, the specimens were light cured for 5 and 10 seconds. Stainless steel brackets were bonded with Enlight bonding system, stored in distilled water at 37°C for 24 hours and then submitted to SBS testing in a universal testing machine at a crosshead speed of 0.5 mm/minute. Adhesive remnant index (ARI) was used to evaluate the amount of adhesive remaining on the teeth determined by stereomicroscope at 10× magnification. The highest mean SBS was obtained with the halogen 40 seconds (18.27 MPa) followed by halogen 20 seconds (15.36 MPa), LED 10 seco...

Research paper thumbnail of Mixed dentition space analysis among Nepalese Brahmins/Chhetris

BMC Oral Health, 2016

Background: Mixed dentition space analysis forms an important part of orthodontic diagnosis and t... more Background: Mixed dentition space analysis forms an important part of orthodontic diagnosis and treatment planning. Regression equations are widely used for mixed dentition analysis which can vary among races. This study aimed to find out the new regression equation in estimating the size of unerupted canines and premolars for Nepalese Brahmins/Chhetris. Methods: Hundred Nepalese Brahmins/Chhetris (50 males and 50 females) who met our criteria were selected among the patients attending to the Orthodontic OutPatient Department, Institute of Medicine, Kathmandu. The mesiodistal widths of all mandibular permanent incisors; maxillary and mandibular canines and premolars were measured and analyzed. The results were also compared with predicted values from the Moyers and the Tanaka and Johnston methods. Correlation and linear regression analyses were performed between the predicted and actual tooth sizes for Nepalese Brahmins/Chhetris and standard regression equations were developed. Results: No significant differences were observed when the sum of canine and premolars of one quadrant is compared between sides and sex. Significant and high positive correlations were found between the mandibular incisors and the combined mesiodistal widths of the canines and premolars for the maxillary (r = 0.72) and mandibular (r = 0.73) segments. Significant differences were observed between the measured values from this study and from Moyers (50 % and 75 % probability) and Tanaka-Johnston methods. Conclusions: The equations and charts commonly used for North American children (50 th or 75 th percentile) did not accurately predict for our sample, so new regression equations and tables were developed for Nepalese Brahmins/Chhetris children.

Research paper thumbnail of Maxillary Impacted Canines: A Clinical Review

Orthodontic Journal of Nepal, 2013

Impacted teeth are those with a delayed eruption time or that are not expected to erupt completel... more Impacted teeth are those with a delayed eruption time or that are not expected to erupt completely based on clinical and radiographic assessment. Palatal displacement of the maxillary canines is defined as the developmental dislocation to a palatal site often resulting in tooth impaction requiring surgical and orthodontic treatments. Impacted permanent maxillary canine occur in 1-2% of the population. The Occurrence of impacted permanent maxillary canines are; 85% palatal and 15% labial. The prevalence of palatally displaced canines (PDC) fluctuates between 0.8-5.2%. Palatally erupting or impacted maxillary canines occur twice often in females than males, and are five times more common in Caucasians than Asians. Of all patients with maxillary impacted canines, 8% have bilateral impactions.DOI: http://dx.doi.org/10.3126/ojn.v3i1.9285 Orthodontic Journal of Nepal, Vol.3, No.1, 2013: 63-68

Research paper thumbnail of Assessment of skeletal maturation with permanent mandibular second molar calcification stages among a group of Nepalese orthodontic patients

Clinical, Cosmetic and Investigational Dentistry, 2016

Background: Assessment of growth status of a patient is a key component in orthodontic diagnosis ... more Background: Assessment of growth status of a patient is a key component in orthodontic diagnosis and treatment planning for growing patients with skeletal discrepancy. Skeletal maturation based on hand-wrist radiograph and cervical vertebral maturation (CVM) are commonly used methods of growth assessment. Studies have shown that stages of dental calcification can also be used to assess skeletal maturation status of an individual, whereas other studies have suggested that the relationship between dental calcification and skeletal maturation should be interpreted with caution owing to racial variation. Objective: To evaluate the relationship between permanent mandibular second molar calcification stages and skeletal maturity assessed by CVM among a group of Nepalese orthodontic patients. Materials and methods: One hundred and sixty-eight digital radiographs (84 orthopantomograms and 84 lateral cephalograms) were obtained from the records of 84 patients who sought orthodontic treatment in Orthodontic and Dentofacial Orthopaedic Unit, Department of Dentistry, Institute of Medicine, Kathmandu. Two parameters were used in this study, namely, CVM stages from lateral cephalogram and Demirjian index (DI) stages from orthopantomogram. The evaluation of digital radiographs was carried out on a computer screen with a resolution of 1,280×800 pixels. The association between DI stages of permanent mandibular second molar and CVM stages was assessed. Results: A statistically significant association was found between DI and CVM stages for both male and female subjects with Pearson's contingency coefficient value of 0.751 and 0.766 for male and female subjects, respectively. Conclusion: Skeletal maturation can be reliably assessed with dental calcification stages of permanent mandibular second molar for Nepalese orthodontic patients.

Research paper thumbnail of Prevalence of Malocclusion Among Medical Students in Institute of Medicine, Nepal: A Preliminary Report

Orthodontic Journal of Nepal, 2013

DOI: http://dx.doi.org/10.3126/ojn.v1i1.9362 Orthodontic Journal of Nepal Vol.1(1) 2011: 24-27