research centers


Search results: Found 29

Listing 1 - 10 of 29 << page
of 3
>>
Sort by

Article
The variation of the cranial base param-eters in Class I, II and III skeletal relati-onships

Author: Hussain A Obaidi
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2007 Volume: 7 Issue: 9 Pages: 6-13
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

Aims: To detect the variation in cranial base parameters among the skeletal relationships of Class I, II and III for both sexes. Materials and Methods: The sample was consisted of 90 lateral cephalometric radiographs 30 for each class (Class I, II and III skeletal relationships of ANB angle 0–2, over 2 and less than 0 degree respectively). The radiographs were for Iraqi adolescents who live in Mosul City of age 15–18 years. The subjects were collected from the Department of Pedodontics, Orthodontics and Preventive dentistry, College of Dentistry, University of Mosul. The radiographs were traced to determine the ANB angle to group the sample into Class I, II and III skeletal relationships, the statistical analysis of cranial base lines (SN, SBa, SCo, SAr and SBa), and the cranial base angles (NSBa, SBaAr, SBaCo, SBaN) was carried out to find their variation among the three skeletal relationships. Results: Revealed that there was no significant difference at (p < 0.05) significant level between sexes. There were significantly increase in mean value of Class II in comparing to Class I and III skeletal relationships for both sexes in the cranial base parameters (lines SN, SBa, NBa, and angle NSBa) and insignificantly greater in the cranial base parameters (line SCo and angle SBaN). Conclusion: There were significantly differences among the Class I, II and III groups in the (SN, SBa, NBa and NSBa) parameters for males, while in females were in the (SN, SBa, NBa and NSBa) parameters. The sex variation was insignificant difference for all the parameters in the three skeletal group

Keywords


Article
Variation of facial heights among the Class I, II and III dentoskeletal relationships (Cephalometric study)

Author: Hussain A Obaidi
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2006 Volume: 6 Issue: 8 Pages: 98-105
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

Aims: To compare the anterior and posterior facial heights among the sexes and total sample. Mean while; to find the facial height variations among the Class I, II and III dentoskeletal groups. Materialsand Methods: The sample comprised of 32 lateral cephalometric radiographs (16 for each sex) for each of the Class I, II and III dentoskeletal relationships. The age of the sample subjects was 15–20years. The lateral cephalometric radiographs were traced. The total, upper and lower anterior facial heights and the total, upper and lower posterior facial heights were measured. Results: No significantdifferences among the both sexes and total sample for the dentoskeletal groups were demonstrated. All the facial heights appeared significantly greater in Class II group than Class I group except upperanterior, upper posterior and lower posterior facial heights and was significantly higher than Class III group in upper anterior, lower anterior and upper posterior facial height. Class III group displayedsignificantly lower value in total facial height than Class I group and significantly larger value in lower posterior facial height than of Class I group and Class II group. Conclusion: The facial heights are notaffected by the sex variation, but there are certain variations in facial heights among the dentoskeletal groups.


Article
Reliability of the S–N line

Author: Hussain A Obaidi
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2006 Volume: 6 Issue: 7 Pages: 35-41
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

Aim: To evaluate the degree of the reliability of the S–N reference line by using highly stable referencelines (vertical and horizontal cranial axes). Materials and Methods: The sample of the studycomprised of lateral cephalometric radiographs of patients 13–18 years, 12 males and 12 females foreach of the three skeletal relationships. The ANB angles were 0–2, more than 2 and less than zerorespectively. The method was conducted by localization of the anterior superior of anterior wall of sellaturcica point (As), which is stable at age 5–6 years, drawing the Vertical Cranial Axis (VCA) whichpass through the point As and tangent to the upper part of the anterior wall of the sella turcica (at leastfor 3 mm); then, drawing the Horizontal Cranial Axis (HCA), which is perpendicular to the VCA at theAs point. The deflection and the sagittal dimension of the S–N line were measured to evaluate thevariation in the location of the points S and N, which are the determinant of the S–N line. Results:Point N had significantly local variation between gender and among the three skeletal relationships, butthat point S had insignificant local variation between gender and among the three skeletal relationships.Conclusion: The S–N line is not stable due to unstability of the location of point N.


Article
Clinical evaluation of bonded brackets for three composite bonding systems

Author: Hussain A Obaidi
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2005 Volume: 5 Issue: 5 Pages: 52-56
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

Bonding the teeth with orthodontic brackets via orthodonticadhesive is essential stage in orthodontic treatment. But,still the failure bracket due to orthodontic or functional forcescould be the predominant problem through the orthodontictreatment, in addition to the enamel fracture; in cases the bracketfailed at the enamel–composite interface completely orpartially (scores 0, 1, 2) as suggested by Artun and Bergland.This study is a clinically attempt to evaluate the failure–bracket number and the bracket failure sites, for three orthodonticcomposite systems, which were two paste (Concise);nomix (Right ON) and light cure (Transbond). These adhesiveswere used in bonding a stainless steel brackets to the teethof adhesive system.The number of the failed brackets through 18 months oftreatment were recorded and the site of the failed bracketswere observed by magnifying lens (10×) and recorded accordingto the Artun and Bergland index.The results showed that there were no significant differencesof failed brackets at p < 0.05 and 0.01 levels amongthese three composite systems, but the Concise adhesive hadthe least failure–brackets.The failure sites of the failed brackets for the three bondingsystems were occurred at scores 2 and 3, while the Concisesystem had the highest percentage of score 3 site (80%)(composite bracket interface).


Article
Comparison Among Three Fixed Palatal Expander Appliances: An in Vitro Study

Author: Hussain A Obaidi
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2014 Volume: 14 Issue: 24 Pages: 37-46
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

To evaluate the effect of three different palatal expanders (Hyrax, Quad-Helix and W-Arch) on maxillary 1st premolar, 2nd premolar and 1st molar width changes. Materials and Methods: The sample consisted of three groups, the Hyrax (N=10), the Quad-Helix (N=10) and the W-Arch (N=10). Images were taken before and after expansion; analysis were made using Autodesk AutoCAD© pro-gram. One-way ANOVA and Duncan's multiple range tests were used (P ≤ 0.05). Results: Significant difference was found in the maxillary 1st premolar, 2nd premolar and 1st molar width changes between the Hyrax and the other two expanders, while there was no significant difference between the Quad-Helix and the W-Arch expanders. Conclusion: Maxillary arch width increases more consistently with the Hyrax expanders.

Keywords

Palatal expander --- Hyrax --- Quad-Helix --- W-Arch.


Article
Evaluation of Tipping, Rotation and rate of space Closure Rate of Canine Retraction by friction less orthodontic techniques (An In vitro Study(.

Authors: Hussain A Obaidi --- Omar Sabah
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2006 Volume: 6 Issue: SpIss Pages: S30-S37
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

To evaluate the effect of loops geometry (design) on the rate of space closure, degree of rotation, and degree of tipping. Materials and Methods: The sample consisted of 8 type of loops, namely vertical–loop, vertical with helix–loop, T–loop, readymade loop, PG (universal retraction spring)–loop, opus–loop, teardrop–loop, and L–loop. The method adapted in present study was carried out on Typodont simulation system. The data subjected to the descriptive and variance statistics at 0.05 significant level. Results: There was a significant difference between loops in rate of space closure, rotation and tipping. Vertical loops gave higher significance of rate of space closure and also higher significance degree of rotation and tipping when compared with other loops, while the readymade loop is lowest significance a rate of space closure but it gave low degree rotation and tipping. Although T– loop gave a rate of space closure less than vertical loops but it had the lowest significant degree of rotation and tipping. Conclusion: The T–loop is so more controls and simplest than other loops performing low significance of rotation and tipping tooth movements and achieving higher significance in rate of space closure


Article
Evaluation of the variation of skeletofacial angles(facial,mandibular,and gonial angles) among the pubertalage groups: (A cephalometric study).

Authors: Manar Y Abdul-Qadir --- Hussain A Obaidi
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2007 Volume: 19 Issue: 1 Pages: 101-106
Publisher: Baghdad University جامعة بغداد

Loading...
Loading...
Abstract

ABSTRACT
Background: The skeletofacial growth pattern changes among pubertal age could or could not associate with the change in skeletofacial angles. These angles have a definite influence on skeletal relationships. The aim of this study was to determine the variation in the skeletofacial angles among the four pubertal age groups.
Materials and method: The sample subjects were aged between 11-14 years. The criteria for the sample selection were normal class I molar occlusion with normal overbite and over jet (1- 4 mm), no detectable dental crowding or spacing, no rotations and no history of previous orthodontic treatment and/or craniofacial surgery. All the subjects were radiographed with lateral cephalometric films. The radiographs were traced and the skeletofacial angles were measured and the data were subjected to statistical analysis using the analysis of variance, Duncan multiple range test and t-test at p < 0.05 for gonial (Ar-Go-Me) and Mandibular plane angles (FH/GoMe).
Results: The facial angle (FH/NPog) showed no significant difference among the age groups in males only, while in females the facial angle displayed a significantly higher value at 13 years group as compared with both 11 years and 12 years groups. Comparison between the genders revealed a significantly lower value in males than females for the facial angle at 13 years group only.
Conclusion: The skeletofacial angles gonial and Mandibular plane angles demonstrated no significant change among the four age groups for both gender and no significant difference was noticed between males and females at 11, 12, and 14 years age groups for all angles.
Key words: skeletofacial angles, pubertal age. (J Bagh Coll Dentistry 2007; 19(1): 101-106).

Keywords


Article
Upper lip profile changes

Authors: Manar Y Abdul–Qadir --- Hussain A Obaidi
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2007 Volume: 7 Issue: 10 Pages: 153-159
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

Aims: To explore the upper lip thicknesses, height and it's relationship to the esthetic line. Materialsand Methods: The studying sample included 48, 41, 50 and 44 individuals of age 11, 12, 13 and 14years respectively. The subjects were Iraqi individuals of Class I normal occlusion, who live in centerof Mosul City. All subjects were radiographed with lateral cephalometric films, these films weretraced, the tracing included the upper lip thickness at skeletal points (A–A´ ), upper lip thickness atlabrale superius (Ls–Ls´), upper lip height at stromion superior to palatal plane and the upper liprelationship to the esthetic line. All these measurements were measured and then subjected to thestatistical analysis. Results: The results were demonstrated that the upper lip thickness (A–A`) and(Ls–Ls`) were only significant increase at 14 year age groups as compared with 11 years age group inmales. In female the upper lip thickness was only significant at 13 years group as compared with 11years age group, while the upper lip relationship to esthetic line showed only significantly greater valueat 14 years age group as compared with 13 years age group. Sex variation appeared a significantgreater value in male than female for the (Ls–E line) at 11 years age group, (A–A`) and (Ls–E line) at12 years age group, (Ls–Ls`) at 13 years age group and upper lip height at 14 years age group andupper lip height at 14 years age group. Conclusions: The soft tissue of upper lip profile parameterswere increased with increasing age group, and the upper lip significantly larger behind the esthetic linein female than male at 11, 12 and 14 years age groups.

Keywords

Endosteal Lip --- thickness --- height --- esthetic.


Article
The Mechanical Properties of the Extra Hard Spring Arch Wire Subjected to the Artificial Saliva

Authors: Sarmad S Al–Qassar --- Hussain A Obaidi
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2009 Volume: 9 Issue: 13 Pages: 131-135
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

Aims: To evaluate and compare the value of the mechanical properties of the extra hard spring stainless
steel arch wire immersed in artificial saliva. Materials and Methods: The sample consisted of 40
extra hard spring stainless steel arch wires (Remanium, 0.016&#8243; × 0.016&#8243;, Dentarum, Germany) divided
into; control wires group and experimental group (ten wires for each group). The experimental group
was immersed in artificial saliva (PH 6.75+ 0.015) ) and incubated at 37 for one, two and four weeks
respectively. The curve of tensile strength for the control and experimental groups was performed using
the tensile testing machine. The mechanical properties of the arch wire have been derived. The results
were analyzed using the statistics of descriptive, Anova and Duncan’s Multiple Range Analysis
tests. Results: The results showed that the mechanical properties (ultimate tensile strength, elastic
modulus, springiness (springback) ,elastic limit, plastic limit (ductility) of the extra spring hard stainless
steel arch wire significantly decrease as the immersion time in artificial saliva increase when compared
with the control group. Conclusions: It is recommended not utilize the extra spring hard stainless
steel arch wire for long periods during orthodontic treatments.

Keywords


Article
Shear and Tensile Strengths of The Bonded Bracket to The Ceramic Surface

Authors: Muzahim H Hanna --- Hussain A Obaidi
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2010 Volume: 10 Issue: 16 Pages: 254-259
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

Aims: To assess the shear and tensile strengths of the bonded bracket to the treated porcelain surface with hydrofluoric acid, and microetcher. Materials and Methods: The sample included 30 specimens of porcelain blocks (6 mm in diameter and 2mm thickness). The sample was grouped into three groups, 10 specimens for each group. The groups were: acid etched, microetched at 5mm distance, and micro-etched at 10mm distance. Stainless steel brackets (Roth System) were bonded to the treated porcelain surfaces using light cure Orthodontic composite resin. All the groups were thermocycled. The shear and tensile bond strengths of the bonded bracket were measured by using the shear and tensile Univer-sal testing machine. The results were analyzed statistically; that include: Descriptive, ANOVA and Duncan’s multiple analysis range testes at p&#8804; 0.05 significant level. Results: It was revealed that the shear and tensile bond strength values of the bonded brackets to porcelain surface treated with microet-cher at 5mm distance was greater significantly than that treated with acid etch, and microetched at 10mm distance. Conclusions: The porcelain surface treated with microetcher is strongly recommended for bonding orthodontic brackets.

Keywords

Listing 1 - 10 of 29 << page
of 3
>>
Sort by
Narrow your search

Resource type

article (29)


Language

English (29)


Year
From To Submit

2015 (2)

2014 (1)

2013 (1)

2011 (2)

2010 (1)

More...