Anila charles - Academia.edu (original) (raw)
Papers by Anila charles
Orthodontists are confronted with an increasing number of medically compromised patients who requ... more Orthodontists are confronted with an increasing number of medically compromised patients who require proper alignment for esthetics and oral rehabilitation. The present review is regarding the current knowledge of the most common systemic and local diseases on the outcome of orthodontic treatment, Fortunately in orthodontics complications are infrequent and are of minor consequence, nevertheless the practitioner should understand and have a basic knowledge and understanding of the disease and its impact on the oral cavity as it is essential to recognize oral signs and symptoms of undiagnosed medical problems too.
International Journal of Orofacial Research, 2017
It is important for orthodontists to make every effort to develop a harmonious balance that will ... more It is important for orthodontists to make every effort to develop a harmonious balance that will produce the most attractive smile possible for each patient treated. A smile usually translates a common man emotional intelligence and expresses his feeling in a unique fashion Thus, he seeks the orthodontist to improve the esthetics and especially the smile. The success of smile design is determined by the patient's profile and the orthodontist's esthetic goals and skill so as to re-establish patients' expectations. This article enlights the overview few characteristics for a balanced smile.
SRM Journal of Research in Dental Sciences, 2017
Background and Aim: An inordinate percentage of orthodontic patients present with Class II mandib... more Background and Aim: An inordinate percentage of orthodontic patients present with Class II mandibular deficient problems. Mandibular deficiency is one of the major risk factors for developing obstructive sleep apnea (OSA). If functional appliance therapy for mandibular development also increases the pharyngeal airway dimensions the risk for developing OSA in these patients will be minimized. The aim of the present study is to evaluate the changes in the sagittal pharyngeal airway dimensions (SPAD) after twin-block functional appliance therapy in adolescent patients with mandibular retrognathism, utilizing linear, and area measurements. Materials and Methods: A total of 14 patients with an age range of 12–14 years, both the genders having skeletal Class II malocclusion with a deficient mandible were selected and twin-block functional therapy was initiated. Lateral cephalograms were taken at the start of functional jaw orthopedic treatment (time point T1) and at its completion (time p...
Dental Research Journal, 2018
Background: The purpose of the study was to evaluate and to compare the shear bond strength (SBS)... more Background: The purpose of the study was to evaluate and to compare the shear bond strength (SBS), adhesive remnant index, and surface roughness of the samples bonded after etching with phosphoric acid and erbium, chromium-doped: Yttrium scandium-gallium-garnet (Er, Cr: YSGG) laser. Materials and Methods: In the present analytical/descriptive study, 90 premolars extracted for orthodontic purposes were used, out of which 75 were randomly divided into five groups where five different methods were used to prepare the enamel for bonding; etching with 37% phosphoric acid for 15 s, irradiation with Er, Cr: YSGG laser at 1 watt for 10 s and 20 s, and irradiation with Er, Cr: YSGG laser at 1.5 watt for 10 s and 20 s. Following this, metal brackets were bonded with Transbond XT. Brackets were debonded 24 h, later and SBS were measured, and adhesive remnant index scores were measured. The remaining 15 teeth were used for surface evaluation of these five groups using three-dimensional optical ...
Orthodontists are confronted with an increasing number of medically compromised patients who requ... more Orthodontists are confronted with an increasing number of medically compromised patients who require proper alignment for esthetics and oral rehabilitation. The present review is regarding the current knowledge of the most common systemic and local diseases on the outcome of orthodontic treatment, Fortunately in orthodontics complications are infrequent and are of minor consequence, nevertheless the practitioner should understand and have a basic knowledge and understanding of the disease and its impact on the oral cavity as it is essential to recognize oral signs and symptoms of undiagnosed medical problems too.
CONTEXT Bonding procedures are time consuming and debonding of brackets is a common problem encou... more CONTEXT Bonding procedures are time consuming and debonding of brackets is a common problem encountered in orthodontics. AIMS The purpose of this in vitro study was to evaluate the shear bond strength (SBS) with different enamel pretreatment (acid etching, air abrasion, and bur abrasion) to enhance the bonding performance. SUBJECTS AND METHODS A total of 60 extracted premolars for orthodontic purposes were randomly assigned to three groups based on conditioning method: Group I - conventional etching with 37% phosphoric acid; Group II - air abrasion with 50 μm aluminum oxide; and Group III - bur abrasion with diamond fissure (#330, MANI, Dia-Burs, New Jersey, USA). After storing the specimens for 24 h in distilled water at 37°C, SBS was measured with Universal testing machine (Lloyd Universal testing machine-Model No. L.R 100K, UK). The shear force at a crosshead speed of 1 mm/min was transmitted to brackets. The adhesive remnant index (ARIs) scores were recorded after bracket failur...
Background: Skin is the largest human organ, which performs a dynamic role in life. The ectoderma... more Background: Skin is the largest human organ, which performs a dynamic role in life. The ectodermal layers of the skin found on the palm with intricate lines are stable throughout life and have grabbed scientific attention. Any disturbances during their formation might possibly have the likelihood of a person developing malocclusion. Aims and Objectives: The aims of this study were to evaluate and compare the dermatoglyphic pattern with various skeletal malocclusions. Materials and Methods: The study was carried out on 40 outpatients reported with an age group of 18–20 years divided into four groups as follows: Group: I – 10 (Class I occlusion), Group: II – 10 (skeletal Class I malocclusion), Group: III – 10 (skeletal Class II malocclusion), and Group: IV – 10 (skeletal Class III malocclusion). The fingerprints were recorded using scanner exclusively designed for diagnostic purpose of the study. The collected data were analyzed using SPSS statistics software Version 23.0 to find whic...
Aim: The high incidence of nickel (Ni) allergy and the increasing use of Ni-containing dental bio... more Aim: The high incidence of nickel (Ni) allergy and the increasing use of Ni-containing dental biomaterials have been of growing concern. The purpose of this investigation was to analyze and evaluate the rate of Ni ion release from different types arch wires used in orthodontics. Materials and Methods: Four groups of arch wires (nickel titanium [NiTi], SS, Cu NiTi and ion implanted NiTi) with twelve samples were stored in artificial saliva with a pH 5.6-7.0 thermostated at (36.5°C) and tested at different intervals i.e., 7th day, 14th day, and 21st day. The amount of Ni and Ti ions released from the sample were evaluated using an atomic adsorption spectrophotometer. The solution was replaced with a fresh bottle to avoid sediments. Results: Statistical analysis was performed by nonparametric tests (Student's paired t-test, one-way analysis of variance and multiple comparison test by Tukey “Honestly significant difference”). The statistical package SPSS PC plus (version 4.0.1) was ...
Indian journal of dental research : official publication of Indian Society for Dental Research
Bonding procedures are time consuming and debonding of brackets is a common problem encountered i... more Bonding procedures are time consuming and debonding of brackets is a common problem encountered in orthodontics. The purpose of this in vitro study was to evaluate the shear bond strength (SBS) with different enamel pretreatment (acid etching, air abrasion, and bur abrasion) to enhance the bonding performance. A total of 60 extracted premolars for orthodontic purposes were randomly assigned to three groups based on conditioning method: Group I - conventional etching with 37% phosphoric acid; Group II - air abrasion with 50 μm aluminum oxide; and Group III - bur abrasion with diamond fissure (#330, MANI, Dia-Burs, New Jersey, USA). After storing the specimens for 24 h in distilled water at 37°C, SBS was measured with Universal testing machine (Lloyd Universal testing machine-Model No. L.R 100K, UK). The shear force at a crosshead speed of 1 mm/min was transmitted to brackets. The adhesive remnant index (ARIs) scores were recorded after bracket failure. Descriptive statistics, multipl...
Indian Journal of Dental Research
Dental research journal
The purpose of the study was to evaluate and to compare the shear bond strength (SBS), adhesive r... more The purpose of the study was to evaluate and to compare the shear bond strength (SBS), adhesive remnant index, and surface roughness of the samples bonded after etching with phosphoric acid and erbium, chromium-doped: Yttrium scandium-gallium-garnet (Er, Cr: YSGG) laser. In the present analytical/descriptive study, 90 premolars extracted for orthodontic purposes were used, out of which 75 were randomly divided into five groups where five different methods were used to prepare the enamel for bonding; etching with 37% phosphoric acid for 15 s, irradiation with Er, Cr: YSGG laser at 1 watt for 10 s and 20 s, and irradiation with Er, Cr: YSGG laser at 1.5 watt for 10 s and 20 s. Following this, metal brackets were bonded with Transbond XT. Brackets were debonded 24 h, later and SBS were measured, and adhesive remnant index scores were measured. The remaining 15 teeth were used for surface evaluation of these five groups using three-dimensional optical profiler. The results of the SBS te...
Contemporary clinical dentistry
The aim of this study was to compare the rate of canine retraction, the anchorage loss, and the c... more The aim of this study was to compare the rate of canine retraction, the anchorage loss, and the change in the inclination of the first molars between molar and mini-implant anchorage. (1) To compare the rate of canine retraction between conventional molar anchorage and mini-implant anchorage in the maxilla and mandible. (2) To compare the amount of anchor loss between mini-implant-anchored and molar-anchored sides during canine retraction in the maxilla and mandible. Ten patients were included in the study. The implants were loaded immediately by applying a force of 100 g. Measurements were made in the pre-retraction and post-retraction lateral cephalograms. A line drawn vertically from the sella-nasion plane through the distal pterygomaxillary point was used as a reference line. The mean rates of canine retraction were 0.95 and 0.82 mm/month in maxilla on the implant and molar sides, respectively, and were 0.81 and 0.76 mm/month in mandible on the implant and molar sides, respectiv...
International Journal of Dental Sciences and Research, Jan 23, 2014
Severe orthodontic problem that could neither be treated with growth modification or camouflage o... more Severe orthodontic problem that could neither be treated with growth modification or camouflage often requires combined surgical and orthodontic treatment. As the envelope of discrepancy indicate the limitation in orthodontics a multidisciplinary approach is mandatory while treating a skeletal Class III malocclusion in adults. This case reports describes the management of a 22 year old female patient with skeletal class III malocclusion and mild facial asymmetry treated with a non extraction approach, Decompensation was done before surgery followed by a bilateral sagittal split osteotomy. In reviewing the patient, the goals set at the beginning of treatment were successfully achieved, providing the patient with adequate masticatory function and pleasant facial esthetics.
SRM Journal of Research in Dental Sciences, 2013
International Journal of Dental Sciences and Research, 2014
Orthodontists are confronted with an increasing number of medically compromised patients who requ... more Orthodontists are confronted with an increasing number of medically compromised patients who require proper alignment for esthetics and oral rehabilitation. The present review is regarding the current knowledge of the most common systemic and local diseases on the outcome of orthodontic treatment, Fortunately in orthodontics complications are infrequent and are of minor consequence, nevertheless the practitioner should understand and have a basic knowledge and understanding of the disease and its impact on the oral cavity as it is essential to recognize oral signs and symptoms of undiagnosed medical problems too.
Journal of International Society of Preventive and Community Dentistry, 2014
Aim: The high incidence of nickel (Ni) allergy and the increasing use of Ni-containing dental bio... more Aim: The high incidence of nickel (Ni) allergy and the increasing use of Ni-containing dental biomaterials have been of growing concern. The purpose of this investigation was to analyze and evaluate the rate of Ni ion release from different types arch wires used in orthodontics. Materials and Methods: Four groups of arch wires (nickel titanium [NiTi], SS, Cu NiTi and ion implanted NiTi) with twelve samples were stored in artificial saliva with a pH 5.6-7.0 thermostated at (36.5°C) and tested at different intervals i.e., 7 th day, 14 th day, and 21 st day. The amount of Ni and Ti ions released from the sample were evaluated using an atomic adsorption spectrophotometer. The solution was replaced with a fresh bottle to avoid sediments. Results: Statistical analysis was performed by nonparametric tests (Student's paired t-test, one-way analysis of variance and multiple comparison test by Tukey "Honestly significant difference"). The statistical package SPSS PC plus (version 4.0.1) was used for data processing and statistical analysis. Results showed significantly statistical influence on the release amount of Ni and Ti ions. Large variation in concentration of Ni released from brackets and bands combined. However, the amount of Ni ions released in all test solutions diminished with time and was below the critical value necessary to induce allergy and below daily dietary intake level. Conclusions: The daily release of NiTi, SS, Cu NiTi and ion implanted NiTi by an orthodontic appliance in acid pH, particularly favorable to corrosion, was well below that ingested with a normal daily diet. It is therefore concluded that the quantities of metal ions released in our experimental conditions should not be cause for concern in utilizing the appliance.
Orthodontists are confronted with an increasing number of medically compromised patients who requ... more Orthodontists are confronted with an increasing number of medically compromised patients who require proper alignment for esthetics and oral rehabilitation. The present review is regarding the current knowledge of the most common systemic and local diseases on the outcome of orthodontic treatment, Fortunately in orthodontics complications are infrequent and are of minor consequence, nevertheless the practitioner should understand and have a basic knowledge and understanding of the disease and its impact on the oral cavity as it is essential to recognize oral signs and symptoms of undiagnosed medical problems too.
International Journal of Orofacial Research, 2017
It is important for orthodontists to make every effort to develop a harmonious balance that will ... more It is important for orthodontists to make every effort to develop a harmonious balance that will produce the most attractive smile possible for each patient treated. A smile usually translates a common man emotional intelligence and expresses his feeling in a unique fashion Thus, he seeks the orthodontist to improve the esthetics and especially the smile. The success of smile design is determined by the patient's profile and the orthodontist's esthetic goals and skill so as to re-establish patients' expectations. This article enlights the overview few characteristics for a balanced smile.
SRM Journal of Research in Dental Sciences, 2017
Background and Aim: An inordinate percentage of orthodontic patients present with Class II mandib... more Background and Aim: An inordinate percentage of orthodontic patients present with Class II mandibular deficient problems. Mandibular deficiency is one of the major risk factors for developing obstructive sleep apnea (OSA). If functional appliance therapy for mandibular development also increases the pharyngeal airway dimensions the risk for developing OSA in these patients will be minimized. The aim of the present study is to evaluate the changes in the sagittal pharyngeal airway dimensions (SPAD) after twin-block functional appliance therapy in adolescent patients with mandibular retrognathism, utilizing linear, and area measurements. Materials and Methods: A total of 14 patients with an age range of 12–14 years, both the genders having skeletal Class II malocclusion with a deficient mandible were selected and twin-block functional therapy was initiated. Lateral cephalograms were taken at the start of functional jaw orthopedic treatment (time point T1) and at its completion (time p...
Dental Research Journal, 2018
Background: The purpose of the study was to evaluate and to compare the shear bond strength (SBS)... more Background: The purpose of the study was to evaluate and to compare the shear bond strength (SBS), adhesive remnant index, and surface roughness of the samples bonded after etching with phosphoric acid and erbium, chromium-doped: Yttrium scandium-gallium-garnet (Er, Cr: YSGG) laser. Materials and Methods: In the present analytical/descriptive study, 90 premolars extracted for orthodontic purposes were used, out of which 75 were randomly divided into five groups where five different methods were used to prepare the enamel for bonding; etching with 37% phosphoric acid for 15 s, irradiation with Er, Cr: YSGG laser at 1 watt for 10 s and 20 s, and irradiation with Er, Cr: YSGG laser at 1.5 watt for 10 s and 20 s. Following this, metal brackets were bonded with Transbond XT. Brackets were debonded 24 h, later and SBS were measured, and adhesive remnant index scores were measured. The remaining 15 teeth were used for surface evaluation of these five groups using three-dimensional optical ...
Orthodontists are confronted with an increasing number of medically compromised patients who requ... more Orthodontists are confronted with an increasing number of medically compromised patients who require proper alignment for esthetics and oral rehabilitation. The present review is regarding the current knowledge of the most common systemic and local diseases on the outcome of orthodontic treatment, Fortunately in orthodontics complications are infrequent and are of minor consequence, nevertheless the practitioner should understand and have a basic knowledge and understanding of the disease and its impact on the oral cavity as it is essential to recognize oral signs and symptoms of undiagnosed medical problems too.
CONTEXT Bonding procedures are time consuming and debonding of brackets is a common problem encou... more CONTEXT Bonding procedures are time consuming and debonding of brackets is a common problem encountered in orthodontics. AIMS The purpose of this in vitro study was to evaluate the shear bond strength (SBS) with different enamel pretreatment (acid etching, air abrasion, and bur abrasion) to enhance the bonding performance. SUBJECTS AND METHODS A total of 60 extracted premolars for orthodontic purposes were randomly assigned to three groups based on conditioning method: Group I - conventional etching with 37% phosphoric acid; Group II - air abrasion with 50 μm aluminum oxide; and Group III - bur abrasion with diamond fissure (#330, MANI, Dia-Burs, New Jersey, USA). After storing the specimens for 24 h in distilled water at 37°C, SBS was measured with Universal testing machine (Lloyd Universal testing machine-Model No. L.R 100K, UK). The shear force at a crosshead speed of 1 mm/min was transmitted to brackets. The adhesive remnant index (ARIs) scores were recorded after bracket failur...
Background: Skin is the largest human organ, which performs a dynamic role in life. The ectoderma... more Background: Skin is the largest human organ, which performs a dynamic role in life. The ectodermal layers of the skin found on the palm with intricate lines are stable throughout life and have grabbed scientific attention. Any disturbances during their formation might possibly have the likelihood of a person developing malocclusion. Aims and Objectives: The aims of this study were to evaluate and compare the dermatoglyphic pattern with various skeletal malocclusions. Materials and Methods: The study was carried out on 40 outpatients reported with an age group of 18–20 years divided into four groups as follows: Group: I – 10 (Class I occlusion), Group: II – 10 (skeletal Class I malocclusion), Group: III – 10 (skeletal Class II malocclusion), and Group: IV – 10 (skeletal Class III malocclusion). The fingerprints were recorded using scanner exclusively designed for diagnostic purpose of the study. The collected data were analyzed using SPSS statistics software Version 23.0 to find whic...
Aim: The high incidence of nickel (Ni) allergy and the increasing use of Ni-containing dental bio... more Aim: The high incidence of nickel (Ni) allergy and the increasing use of Ni-containing dental biomaterials have been of growing concern. The purpose of this investigation was to analyze and evaluate the rate of Ni ion release from different types arch wires used in orthodontics. Materials and Methods: Four groups of arch wires (nickel titanium [NiTi], SS, Cu NiTi and ion implanted NiTi) with twelve samples were stored in artificial saliva with a pH 5.6-7.0 thermostated at (36.5°C) and tested at different intervals i.e., 7th day, 14th day, and 21st day. The amount of Ni and Ti ions released from the sample were evaluated using an atomic adsorption spectrophotometer. The solution was replaced with a fresh bottle to avoid sediments. Results: Statistical analysis was performed by nonparametric tests (Student's paired t-test, one-way analysis of variance and multiple comparison test by Tukey “Honestly significant difference”). The statistical package SPSS PC plus (version 4.0.1) was ...
Indian journal of dental research : official publication of Indian Society for Dental Research
Bonding procedures are time consuming and debonding of brackets is a common problem encountered i... more Bonding procedures are time consuming and debonding of brackets is a common problem encountered in orthodontics. The purpose of this in vitro study was to evaluate the shear bond strength (SBS) with different enamel pretreatment (acid etching, air abrasion, and bur abrasion) to enhance the bonding performance. A total of 60 extracted premolars for orthodontic purposes were randomly assigned to three groups based on conditioning method: Group I - conventional etching with 37% phosphoric acid; Group II - air abrasion with 50 μm aluminum oxide; and Group III - bur abrasion with diamond fissure (#330, MANI, Dia-Burs, New Jersey, USA). After storing the specimens for 24 h in distilled water at 37°C, SBS was measured with Universal testing machine (Lloyd Universal testing machine-Model No. L.R 100K, UK). The shear force at a crosshead speed of 1 mm/min was transmitted to brackets. The adhesive remnant index (ARIs) scores were recorded after bracket failure. Descriptive statistics, multipl...
Indian Journal of Dental Research
Dental research journal
The purpose of the study was to evaluate and to compare the shear bond strength (SBS), adhesive r... more The purpose of the study was to evaluate and to compare the shear bond strength (SBS), adhesive remnant index, and surface roughness of the samples bonded after etching with phosphoric acid and erbium, chromium-doped: Yttrium scandium-gallium-garnet (Er, Cr: YSGG) laser. In the present analytical/descriptive study, 90 premolars extracted for orthodontic purposes were used, out of which 75 were randomly divided into five groups where five different methods were used to prepare the enamel for bonding; etching with 37% phosphoric acid for 15 s, irradiation with Er, Cr: YSGG laser at 1 watt for 10 s and 20 s, and irradiation with Er, Cr: YSGG laser at 1.5 watt for 10 s and 20 s. Following this, metal brackets were bonded with Transbond XT. Brackets were debonded 24 h, later and SBS were measured, and adhesive remnant index scores were measured. The remaining 15 teeth were used for surface evaluation of these five groups using three-dimensional optical profiler. The results of the SBS te...
Contemporary clinical dentistry
The aim of this study was to compare the rate of canine retraction, the anchorage loss, and the c... more The aim of this study was to compare the rate of canine retraction, the anchorage loss, and the change in the inclination of the first molars between molar and mini-implant anchorage. (1) To compare the rate of canine retraction between conventional molar anchorage and mini-implant anchorage in the maxilla and mandible. (2) To compare the amount of anchor loss between mini-implant-anchored and molar-anchored sides during canine retraction in the maxilla and mandible. Ten patients were included in the study. The implants were loaded immediately by applying a force of 100 g. Measurements were made in the pre-retraction and post-retraction lateral cephalograms. A line drawn vertically from the sella-nasion plane through the distal pterygomaxillary point was used as a reference line. The mean rates of canine retraction were 0.95 and 0.82 mm/month in maxilla on the implant and molar sides, respectively, and were 0.81 and 0.76 mm/month in mandible on the implant and molar sides, respectiv...
International Journal of Dental Sciences and Research, Jan 23, 2014
Severe orthodontic problem that could neither be treated with growth modification or camouflage o... more Severe orthodontic problem that could neither be treated with growth modification or camouflage often requires combined surgical and orthodontic treatment. As the envelope of discrepancy indicate the limitation in orthodontics a multidisciplinary approach is mandatory while treating a skeletal Class III malocclusion in adults. This case reports describes the management of a 22 year old female patient with skeletal class III malocclusion and mild facial asymmetry treated with a non extraction approach, Decompensation was done before surgery followed by a bilateral sagittal split osteotomy. In reviewing the patient, the goals set at the beginning of treatment were successfully achieved, providing the patient with adequate masticatory function and pleasant facial esthetics.
SRM Journal of Research in Dental Sciences, 2013
International Journal of Dental Sciences and Research, 2014
Orthodontists are confronted with an increasing number of medically compromised patients who requ... more Orthodontists are confronted with an increasing number of medically compromised patients who require proper alignment for esthetics and oral rehabilitation. The present review is regarding the current knowledge of the most common systemic and local diseases on the outcome of orthodontic treatment, Fortunately in orthodontics complications are infrequent and are of minor consequence, nevertheless the practitioner should understand and have a basic knowledge and understanding of the disease and its impact on the oral cavity as it is essential to recognize oral signs and symptoms of undiagnosed medical problems too.
Journal of International Society of Preventive and Community Dentistry, 2014
Aim: The high incidence of nickel (Ni) allergy and the increasing use of Ni-containing dental bio... more Aim: The high incidence of nickel (Ni) allergy and the increasing use of Ni-containing dental biomaterials have been of growing concern. The purpose of this investigation was to analyze and evaluate the rate of Ni ion release from different types arch wires used in orthodontics. Materials and Methods: Four groups of arch wires (nickel titanium [NiTi], SS, Cu NiTi and ion implanted NiTi) with twelve samples were stored in artificial saliva with a pH 5.6-7.0 thermostated at (36.5°C) and tested at different intervals i.e., 7 th day, 14 th day, and 21 st day. The amount of Ni and Ti ions released from the sample were evaluated using an atomic adsorption spectrophotometer. The solution was replaced with a fresh bottle to avoid sediments. Results: Statistical analysis was performed by nonparametric tests (Student's paired t-test, one-way analysis of variance and multiple comparison test by Tukey "Honestly significant difference"). The statistical package SPSS PC plus (version 4.0.1) was used for data processing and statistical analysis. Results showed significantly statistical influence on the release amount of Ni and Ti ions. Large variation in concentration of Ni released from brackets and bands combined. However, the amount of Ni ions released in all test solutions diminished with time and was below the critical value necessary to induce allergy and below daily dietary intake level. Conclusions: The daily release of NiTi, SS, Cu NiTi and ion implanted NiTi by an orthodontic appliance in acid pH, particularly favorable to corrosion, was well below that ingested with a normal daily diet. It is therefore concluded that the quantities of metal ions released in our experimental conditions should not be cause for concern in utilizing the appliance.