research centers


Search results: Found 11

Listing 1 - 10 of 11 << page
of 2
>>
Sort by

Article
Comparison Between Laceback and Tie-back in Sliding Mechanics (An in vitro study)

Author: Khawla M Awni
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2012 Volume: 12 Issue: 19 Pages: 148-152
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

ABSTRACTAims: The current study aims to investigate the rate of space closure, tipping and rotation of canine during its retraction by laceback and tieback using standard ceramic brackets along 2 types of arch-wires using typodont simulation system (Ormco). Materials and Methods: The standardization crite-ria were all typodont teeth situated in well aligned position, covered and immobilized by the acrylic bite except canine, laceback and tieback were used to slide the canine. Results: The present study showed that when slide the canine on 0.017x 0.025 inch archwire gave rise to significant decrease in the rate of space closure, degree of tipping and rotation as compared when sliding it on 0.020 inch archwire, also sliding the canine using laceback as a method of retraction gave rise to a significant decrease in the rate of space closure, degree of tipping and rotation as compared with tieback. Conclusions: It was concluded that canine retraction using laceback retraction method along 0.017x0.025 inch archwire gave rise to a significant decrease in the rate of space closure, degree of tipping and rotation.


Article
Comparison between Tanaka/Johnston and Boston University prediction approaches in a group of Iraqi pupils

Author: Khawla M Awni
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2005 Volume: 5 Issue: 6 Pages: 154-160
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

The purpose of this study was to compare two mixed dentitionprediction methods that do not require the use of periapicalradiographs of the unerupted permanent lower teeth.The two compared methods were the Tanaka/Johnston (T/J)and the Boston University (BU) prediction approaches.Study casts of 52 children (20 males and 32 females)were used; those children were selected from primary and secondaryschools located in different areas of Mosul City. Allsubjects have normal Class I molar relationship.The finding indicated that on the average the T/J approachoverestimated the tooth size of the unerupted teeth (mean+ SD = 1.02 + 1.07 mm). On the other hand, the BU approachunderestimated the tooth size of the unerupted teeth (mean +SD = –0.2 + 1.07 mm). The findings further indicated that therewere statistically significant correlation between the predictedand actual tooth size.The error involved in the use of the prediction equationswas expressed as the standard error of the estimate (SEE).The present findings indicated that the SEE for T/J predictionranged between 0.52–0.63 mm and the corresponding valuesfor BU equation ranged between 0.45–0.68 mm. Dependingon the stage of dental development; i.e., which deciduous andpermanent teeth are present, the T/J approach can be usedwhen the only permanent four mandibular incisors have completelyerupted, whereas the BU approach can be used whenall the deciduous (canines and first molars) are still present.


Article
The Relationship Between Incisor Crown Shape and Dental Crowding

Author: Khawla M Awni
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2012 Volume: 12 Issue: 20 Pages: 344-349
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

Aims: The aim of this study was to investigate if there is a correlation between the shape of the crowns of the incisors and crowding. Materials and Methods: Plaster models of 100 individuals having class I molar relationship were chosen .By using the irregularity index, 51 individuals (22 males and 29 fe-males) were considered to be the crowding group(irregularity index >3mm),and 49 individuals (23 males and 26 females) were considered to be the normal group(irregularity index< 3mm).The casts were selected from the POP department at the college of dentistry in Mosul University. Repeated mea-surements of the maximum mesiodistal width of the incisal and cervical areas of the incisors were tak-en by means of a vernier caliper and a ratios of these measurements were calculated. Results:The mean value for the crowding group was significantly higher in the incisal area of lower incisors and upper central incisors than corresponding values in the normal group. A significant correlation was present between upper irregularity index and upper lateral incisor mesiodistal width ratio. Conclusions: The lower incisors were more triangulary shaped in the crowding group than those in the normal one.

Keywords

Incisors --- crown shape --- crowding


Article
The Relation of Dentoskeletal Parameters with Mandibular Anterior Crowding in the Early Mixed Dentition

Author: Khawla M Awni
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2013 Volume: 13 Issue: 22 Pages: 333-339
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

Aims: The aims of this study were to evaluate the dental and skeletal parameters which might be associated with mandibular anterior crowding in the early mixed dentition and to determine if these parameters of patients with and without crowding differ. Materials and Methods: Study models and lateral cephalometric radiographs of 80 Iraqi children lived in the center of Mosul City (40 boys and 40 girls), were evaluated. The age ranged between 7-10 years .The casts were divided into two groups ; crowding and non crowding, the lengths and widths of the lower dental arches, dental and skeletal (linear and angular) cephalometric measurements were used to determine the effect of these measurements on mandibular anterior crowding. Results: Significant differences between crowding and non crowding groups were seen in many of dental and skeletal measurements particularly the angles measured the relation between the maxilla and mandible to the anterior cranial base, the length of the anterior and posterior cranial base and the angles measured the inclination of lower incisors to the mandibular plane. The correlation coefficients of the amount of crowding with all the measurements were studied. Some of them showed a positive correlation , while others showed a negative one. Conclusions: The current results suggested that besides tooth size and transverse arch dimensions, effective dentoskeletal measurements are also an important factors related to mandibular anterior crowding in the early mixed dentition.


Article
Dentoskeletal Parameters Comparison of Different Types of Overbite in Class I Occlusion (Lateral Cephalomtric Study)

Authors: Fadhil Y Jassim --- Khawla M Awni
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2014 Volume: 14 Issue: 24 Pages: 52-59
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

This study is intended to evaluate the skeletofacial and dental parameters in different types of overbite and to compare among them. Materials and Methods: It was carried out on a sample of 150 Iraqi adolescents (65 males and 85 females), aged (12-15) years with class I malocclusion have different overbite (open, normal and deep bites).The sample were selected according to certain criteria among the students of intermediate schools in the center of Mosul city. Lateral cephalometric radiograph was taken for each subject. Twenty-one cephalometric measurements (nine angular and twelve linear) and five ratios had been determined. Results: There are significant differences among the three types of overbite concerning total anterior facial height, upper anterior facial height and lower anterior facial height variables. Also, upper posterior dental height and lower posterior dental height show a significant difference between them. Anterior cranial base to mandibular plane angle, palato mandibular plane angle, occluso-mandibular plane angle, gonial angle and summation of posterior angles are significantly different among the different types of overbite in both sexes and the total sample. All skeletal and dental ratios are significantly different among the three types of overbite in both sexes and total sample. Conclusions: The study concludes that open bite group possesses significant higher values of total and lower anterior facial height, upper and lower posterior dental height, while deep bite group possesses significant higher value of upper anterior facial height.


Article
Validation of Tanaka and Johnston Method on Iraqi Population

Authors: Younis MS Hasan --- Khawla M Awni --- Hind T Jarjees
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2009 Volume: 9 Issue: 13 Pages: 17-23
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

Aims: To validate Tanaka and Johnston's analysis on (50) Iraqi patients (29 females and 21 males)
aged 14–22 years. The patients had normal class I molar relation ship with full permanent dentition.
Materials and Methods: Plaster models of 50 (14–22) years old patients were selected. Mesio–distal
crown diameter for maxillary and mandibular permanent teeth were measured. Statistical descriptive,
probability theory, correlation coefficients between individual and grouped teeth were calculated using
Tanaka and Johnston method. Results: Tanaka and Johnston's analysis tables, equations and approximations
were modified in order to improve the accuracy of the prediction. The correlation coefficients
found between the size of the permanent mandibular central incisors and maxillary first molars (1, 1, 6
and 6) and maxillary and mandibular canines and premolars were high (r = 0.62 and r = 0.67, respectively).
New, more accurate prediction tables applicable at earlier ages, and new regression equations
were constructed. In addition, new easier approximations were developed to allow the prediction of the
size of the unerupted maxillary canines and premolars by adding 5.6 mm to the half–widths of teeth 1,
1, 6 and 6. The analogous prediction of the size of unerupted mandibular canines and premolars was
obtained by adding 5.4 mm to the half widths of same teeth 1 ,1 , 6 and 6. Conclusions: The new analysis
prediction tables and new regression equations based on teeth 1 ,1, 6 and 6, which erupt earlier
than teeth used by Tanaka and Johnston, proved even more accurate than both previous equations.

Keywords


Article
An Evaluation of the Integumental Facial Profile and It's Relation to Underlying Structures

Authors: Enas T Muhseen --- Khawla M Awni --- Hind T Jarjees
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2011 Volume: 11 Issue: 17 Pages: 194-201
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

Aims : To evaluate the correlations between the skeletal measurements and soft tissue measurements in males and females. Materials and Methods: Eighty students (40 males and 40 females) were selected aged (12-14) years with class I normal occlusion from intermediate schools in Mosul City . A standar-dized lateral cephalometric radiograph was taken for each student, eighteen variables, 9 angular (6 ske-letal and 3 soft tissue ) and 9 linear (3 skeletal and 6 soft tissue) were used in this study. Results: In males, angle of facial convexity positively correlated with angle of skeletal convexity and negatively with the angle describes the relationship of the maxillary and mandibular bases in the sagittal planes.The length of mandibular corpus was positively correlated with upper lip thickness, lower lip thickness at labral inferius and upper lip height . Upper lip thickness at labral superius was positively correlated with angle defines the anteroposterior position of maxilla in relation to anterior cranial base and angle indicates the anteroposterior position of the mandible in relation to the anterior cranial base.Lower lip height was positively correlated with the mandibular plane angle .In females, angle of facial convexity was positively correlated with angle of skeletal convexity and negatively with the an-gle describes the relationship of the maxillary and mandibular bases in the sagittal planes. The angle measures the protrusion of upper lip relative to the inferior border of the nose was negatively correlated with angle of skeletal convexity and mandibular length and positively with angle describes the relation-ship of the maxillary and mandibular bases in the sagittal planes.Angle of skeletal convexity was posi-tively correlated with upper lip thickness at point A and upper lip thickness at labral superius . The mandibular plane angle was positively correlated with lower lip height. The angle describes the rela-tionship of the maxillary and mandibular bases in the sagittal planes was positively correlated with labiomental angle and negatively with upper lip thickness at labral superius . The mandibular length was negatively correlated with labiomental angle and positively with upper lip thickness at point A ,upper lip thickness at labral superius , lower lip thickness , soft tissue thickness at the chin , upper lip height and lower lip height . The length of the mandibular corpus was negatively correlated with labi-omantal angle and positively with upper lip thickness at point A and upper lip thickness at labral supe-rius .The length of the maxilla was positively correlated with upper lip thickness at point A , upper lip thickness at labral superius and lower lip thickness. Conclusions:There were no consistend correlations between soft and hard tissue structures , some are positively correlated others are negatively correlated and some of them are completely independent.

Keywords


Article
The Relation Between Cervical Vertebral Body Morphology and Craniofacial Parameters in Normal and Deep Bite Patients

Authors: Khawla M.Awni --- Hind T. Jarjees --- Enas T. Muhseen
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2015 Volume: 15 Issue: 27 Pages: 448-455
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

Aims: The aims of the present study were to describe the morphology of the cervical column in adult patients with a skeletal deep and normal bite occlusion, the prevalence of these morphology within them and to analyse the associations between the morphology of the cervical column and craniofacial parameters. Materials and Methods: The sample of this study composed of two groups, deep bite and normal over bite. The normal or control group composed of 50 adult subjects (25 males and 25 females) aged 18-25 years. The deep bite group composed of 59 adult subjects (20 males and 39 females) aged 18-25 years. Lateral cephalometric radiograph were taken for both normal and deep bite groups. We used 12 variables 11 angular and 1 linear measurements. The morphology of the cervical column was evaluated by visual inspection of the first five cervical vertebrae as they are normally seen in on a standardized lateral cephalometric radiograph. Results: In the skeletal deep bite group, 53.4 per cent had fusion of the cervical column and 23.2 per cent posterior arch deficiency (partial cleft). The fusion always occurred between C2 and C3. In the normal over bite group, 12.9 per cent fusion of the cervical column and 5.35 per cent of posterior arch deficiency, the fusion always occurred between C2 and C3. The significant correlations were seen between fusion and the angle between palatal plane and mandibular plane, the angle formed between the long axis of upper central incisor and palatal plane and the distance between the incisal edges of upper and lower central incisors, also the significant correlation between posterior arch deficiency and the angle between palatal plane and mandibular plane, the angle between the mandibular plane and chin line, gonial angle and the angle formed between the long axis of upper central incisor and palatal plane. Conclusions: The deep bite group had more deviations of the cervical column than the normal group. Our results showed that the craniofacial parameters, occlusion and malformations of the jaws were affected by morphological deviations of the upper cervical vertebrae including fusion and posterior arch deficiency.


Article
Evaluation of Rotation, Tipping and Extrusion During Canine Retraction by Sliding Mechanics Using Different Arch Wires

Authors: Mustafa M Hamed --- Hind T Jarjees --- Khawla M Awni
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2007 Volume: 7 Issue: SpIss Pages: S93-S102
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

Aims: To evaluate the amount of rotation, tipping and extrusion using different wires and to Estimate the difference in the amount of tipping, rotation and extrusion between Stainless steel and Teflon ligature in different wires. Materials and Methods: The standardizing criteria were all Typodont teeth situated in well–aligned, covered and immobilized by the acrylic bite except canine; The available space for canine sliding was (14 mm) measured by digital vernia. Elastic chain exerting 180 gm of force on canine measured carefully by tension gauge. In both vertical and horizontal direction a photographs that were taken for Typodont using digital camera. The angle between bite plane extension bar and Canine extension bar were (90o) measured by protractor directly on the photograph. Preformed band with its attachments, ready made stainless steel, composite coated and TMA arch wires all were (0.018×0.025) with the use of stainless steel and Teflon ligature, Standard titanium spring 11 mm length, Typodont components, within six types of connection the two types of ligation material had been applied to the three different wires then the 1st premolar space tend to be closed by distal canine displacement then the resultant rotation, tipping and extrusion were measured. Statistical Descriptive analysis: One–way and, Two–ways Analysis of Variance were done to detect the variability between methods and which is the best. Results: Three important results showed in the study: First, canine sliding over the composite coated arch wire with the use of stainless steel ligature gave rise to significant decrease in rotation, tipping and extrusion when compared with other methods. Second, stainless steel ligature when compared with Teflon ligature of the same corresponding method gave rise to a significant decrease in the degree of rotation tipping and extrusion. Third, Composite coated arch wires showed lowest degree of rotation then followed by TMA arch wires ordinarily this is due to their rough surface. The largest rotation seen in the stainless steel arch wire this is due to its smooth surface texture, and the same thing for the tipping of the composite coated wires that gave rise to the lowest degree of tipping followed by the stainless steel wires, these result possibly due to their stiffness then higher tipping seen at TMA wires ordinarily a result of their flexibility this sequence were the same for both types of ligations. Conclusions: Best method of space closure is the use of either composite coated arch wire or stainless steel arch wire with stainless steel ligature that give us highest resistance to tipping, lowest extrusion and relatively little rotation when compared with other methods.

Keywords

Rotation --- tipping --- extrusion


Article
Effect of chlorhexidine mouth wash and flouridated mouth wash on mechanical properties of orthodontic arch wires (An in vitro study)

Authors: Khawla M Awni --- Hind T Jarjees --- Hakam H Sabah
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2011 Volume: 11 Issue: SpIss Pages: S150-S159
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

Aims: The aims of the this study were to measure the effect of chlorhexidine and fluoridated mouth wash on mechanical properties of stainless steel and nickel titanium wires and to study the effect of three time intervals (3, 7, and 10 days) immersion on these mechanical properties. Materials and Methods: Two types of orthodontic wires were taken which included stainless steel and superelastic nickel titanium wires (Dentaurum, Germany). The 0.016×0.016 inch wires were selected. Each type of wires divided into seven groups; control group and six experimental groups in which the wires immersed in the chlorhexidine and fluoridated mouth wash for 3, 7, and 10 days and then the mechanical properties of wires (yield stress, ultimate tensile stress, modulus of elasticity) measured by using the universal tensile testing machine. Results: The results of the present study showed that a significant difference in the mechanical properties of both stainless steel and nickel titanium wires between the control group and experimental groups immersed in the fluoridated mouth wash and this decreased in the mechanical properties as immersion time increased. Also the results of the present study showed that a non significant difference in the mechanical properties of both stainless steel and nickel titanium wires between the control group and experimental groups immersed in the chlorhexidine mouth wash. Conclusions: The results of the present study indicated that the fluoridated mouth wash decreased the mechanical properties of stainless steel and nickel titanium wires and this degradation in mechanical properties could contributed to prolong orthodontic treatment. While the chlorhexidine has no effect on mechanical properties of stainless steel and nickel titanium wires

Listing 1 - 10 of 11 << page
of 2
>>
Sort by
Narrow your search

Resource type

article (11)


Language

English (11)


Year
From To Submit

2015 (1)

2014 (1)

2013 (1)

2012 (2)

2011 (2)

More...