research centers


Search results: Found 8

Listing 1 - 8 of 8
Sort by

Article
Bone density determination for the maxilla and the mandible in different age groups by using computerized tomography (Part I)

Authors: Sarah M. Tewfiq سارة توفيق --- Hadeel A. Al- Hashimi هديل علي الهاشمي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2013 Volume: 25 Issue: 1 Pages: 164-170
Publisher: Baghdad University جامعة بغداد

Loading...
Loading...
Abstract

Background: Mini implant stability is primarily related to local bone density; no studies have evaluated bone densityrelated to mini implant placement for orthodontic anchorage between different age groups in the maxilla and themandible. The present research aims to evaluate side, gender, age, and regional differences in bone density of thealveolar bone at various orthodontic implant sites.Materials and method: Fifty three individuals who were divided into two groups according to their age into: group I(ages 16-20 years) and group II (ages 21-29 years) had subjected to clinical examination, then 64-multislicecomputed tomography scan data were evaluated and bone density was measured in Hounsfield unit at 102 points(51 in the maxilla and 51 in the mandible), and mean alveolar bone density was calculated at each site in the CTaxial plane.Results: No significant differences in bone density between the sides and gender were found. Generally, the bonedensity measurements of group I and II were not statistically different at almost most sites. The mean bone density ofthe alveolar cortical bone was greater in the mandible than in the maxilla and showed a progressive increase fromthe anterior to the posterior area, while in the maxilla the highest bone density was at the premolars region. Themaxillary tuberosity was the region with lowest bone density. Cancellous bone had almost comparable densitiesbetween the mandible and the maxilla and its density was less than those of cortical sites.Conclusion: When mini implants are indicated, no gender and side differences affect the success rate regardingbone density; while age and area should be considered when selecting and placing mini implants for orthodonticanchorage.


Article
Effect of Enamel Resin-Removal Methods on Tensile Bond Strength of Rebonded New Brackets

Author: Hakam H Sabah
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2013 Volume: 13 Issue: 21 Pages: 176-183
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

Aims: The objective of this study is to determine (1) the effect of different resin-removal methods on tensile bond strength (TBS) of rebonded new brackets (2) compare various methods of enamel resin-removal to define the best method that produces adequate bond strength (3) to compare the bond strength of newly bonded enamel (virgin enamel) with previously bonded enamel after resin removal from the enamel surface with different methods. Materials and Methods: Seventy human premolars were bonded with stainless steel new brackets, then the teeth were randomly assigned in to 7 groups, each group of 10 teeth. Group1 (control group) where TBS at the first debonding was evaluated (initial bond). Group2 brackets were debonded by bracket removal plier and the remnant adhesive removed by high-speed tungsten carbide bur (TCB) and rebonded with brackets as in initial bond, then the TBS were tested. Group3 as with group2 except that the remaining resin were removed by low-speed TCB . Group 4 as with group2 except that the remaining resin were removed by Diamond carbide Disk . Group 5 as with group2 except that the remaining resin were removed by a microetcher, Group 6 as with group 2 except that the remaining resin were removed manually by composite removing pliers, Group 7 as with group6 except that rebonding bracket without cleaning enamel with rubber cup and pumice. Results: All rotary instrument groups (G2, G3 and G4) showed significant increase in the TBS in comparing with the other groups (G1, G5, G6 and G7) also there were significant decrease in the TBS of the manually removal of adhesive remnant groups in comparing with control group, while there were no significant differences between microetcher group and control group with greater mean value for control group. Conclusions: The outcomes of this study showed that the use of the rotary instrument in the removal of adhesive remnant gives the highest tensile bond strength in compared with the other methods used in this study .


Article
The Effect of Insertion Angle on Primary Stability of Orthodontic Mini-implants "An Experimental in vivo Study"

Author: Saba H Al–Zubaidi
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2013 Volume: 13 Issue: 22 Pages: 327-332
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

Aims: To determine whether obliquely inserted mini-implants can be loaded immediately with light orthodontic force? And which mini-implants are more stable those with 90 degree or 60 degree insertion angles? Materials and Methods: three rabbits were used in this study. Sixteen mini-implants divided into 2 groups equally. The first group implanted in the rabbit’s tibia bone at 90 degree insertion angle and the second group implanted in the rabbit’s tibia bone at 60 degree insertion angle. The stability of mini-implants was measured using periotest device immediately before and after loading and after 2 weeks of loading period. The data were analyzed using descriptive statistic, Analysis of variance (ANOVA), Duncan Multiple analysis range test and student t-test. Result: mini-implants at 60 degree insertion angle can be loaded immediately with light orthodontic force. Also, those miniimplants having a significant greater stability before loading and after two weeks of loading period in comparison with mini-implants implanted at 90 degree angle. Conclusions: In clinical practice, miniimplants inclined to the bone surface at 60degree tend to have better primary stability and can be loaded immediately.


Article
The effect of orthodontic relapse on the proliferation of fibroblast and epithelial rests of Malassez in periodontal ligament of rat molars (A histopathological study)

Authors: Munad J. Al-Duliamy --- Ghada M. Mustafa --- Omar A. Kader
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2013 Volume: 25 Issue: 4 Pages: 114-119
Publisher: Baghdad University جامعة بغداد

Loading...
Loading...
Abstract

Background: Relapse of previously moved teeth, is major clinical problem in orthodontics with respect to the goals ofsuccessful treatment. This study investigated the effect of orthodontic relapse on the proliferation of fibroblast andepithelial rests of Malassez cells in periodontal ligament of rat molars.Materials and Methods: Sixteen ten-week- old male Wister rats were randomly divided into four groups composed offour animals each: Group I received no orthodontic force (control). In both Group II and Group III, uniformstandardized expansive springs were used for moving the maxillary first molars buccally for periods of one and threeweeks respectively. The spring initially generated an average expansive force of 20 g on each side. In Group IV thesprings were left for three weeks, until the maxillary first molars moved buccally, after that the springs were removedand the animals were scarified after three weeks of relapse tooth movement. After the humanly scarification ofanimals, each maxilla in all groups was dissected into two halves each half including the three maxillary molars andprocessed for histological examination. The number of both fibroblast and ERM cells in each cluster was counted inthe PDL of the pressure side of the mesio-buccal roots of the maxillary right and left first molars in all groups and thesurface areas of the ERM clusters were also measured in all groups.Results: The number of fibroblast was significantly increased at the end of active movement (Group III) andsignificantly very highly increased during the relapse period (Group IV). Regarding the ERM cells there werestatistically significant increase in both the number of cells in each ERM cluster and the surface areas of the ERMclusters in Group III and highly significant increase in Group IV, while Group II showed no significant differencesregarding all measurements.Conclusions: It was concluded that fibroblast and ERM cells may play an important role during orthodontic relapse


Article
Force decay of orthodontic elastomeric chains by using three different mechanisms simulating canine retraction

Authors: Nibras J. Mohammed نبراس محمد --- Mushriq F. Al-Janabi مشرق فوزي الجنابي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2013 Volume: 25 Issue: 1 Pages: 159-163
Publisher: Baghdad University جامعة بغداد

Loading...
Loading...
Abstract

Background: The ideal force-delivery system must: provide optimal tooth moving forces that elicit the desired effects,be comfortable and hygienic for the patient, require minimal operator manipulation and patient cooperation andprovide rapid tooth movement with minimal mobility during orthodontic therapy, the elastomeric chains have thegreatest potential to fulfill these requirements.Materials and Methods: This in vitro study was designed to determine the effect of three different mechanisms forcanine retraction : (6-3 , 6-5-3 and chain loop ) on the load relaxation behavior of three types of elastomeric chains :(maximum clear , maximum silver and extreme silver) from the same company (Ortho Technology company) withtwo different brand configurations: closed loop and open (short filament) chains under effect of time at (zero time,24hr., 7, 14 , 21 and 28 days) in artificial saliva.Results: Statistical analysis showed that there was a highly significant difference in the mean percentage forcedecay for the three different mechanisms (P≤ 0.001).For all the three types, the 6-3 mechanism had the smallestmean percentage force decay. There was a highly significant difference in the mean percentage force decay forthe different types (P≤ 0.001). For all three mechanisms, extreme silver elastomeric chains had the smallestpercentage force decay while maximum silver elastomeric chains had the highest percentage force decay.Conclusion: This study illustrated that for all the three types of elastomeric chains, the (6-3) mechanism had thesmallest mean percentage force decay. This finding suggests that it may be most efficient to retract a canine utilizingelastomeric chain directly from the molar hook to the canine bracket. The chain loop mechanism may not beindicated for space closure in vivo due to the excessive physiological force values involved with this mechanism


Article
The effect of different oral hygiene regimens on the quantity of cariogenic plaque on orthodontic bands with different attachments (A clinical photographic study)

Authors: Enas J. Almusawi ايناس الموسوي --- Hayder F. Saloom حيدر فاضل سلوم
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2013 Volume: 25 Issue: 2 Pages: 143-148
Publisher: Baghdad University جامعة بغداد

Loading...
Loading...
Abstract

Background: Fixed orthodontic appliances impede the maintenance of oral hygiene and result in plaqueaccumulation leads to enamel demineralization caused by acids produced by bacteria. Studies on plaque controlstrategies in orthodontic populations are limited. This might be caused by difficulties in the quantitative evaluation ofdental plaque because the teeth have various levels of bracket coverage, and different tooth sizes andmalocclusions, making the traditional categorical indices complex. The present study aims to evaluate the effect ofdifferent hygiene protocols on plaque quantity on bands with different attachments.Materials and method: Twenty patients had four bands within the orthodontic appliance. Then randomly divided intofour groups of hygiene regimens where group A used chlorhexidine dentifrice, group B used fluoridated dentifrice,group C used chlorhexidine mouthwash along with chlorhexidine dentifrice and group D used chlorhexidinemouthwash in addition to the fluoride dentifrice. Bands were removed four weeks after the appliance been in place,cut out carefully into 2 pieces from the center of the mesial and distal contact areas, biochemical test (clinprocarioL-pop) was applied then 80 digital photographs were obtained. Four areas of interest were estimated which aremesially and distally to each attachment (2 mm) in width each. Percentage of plaque in these areas was calculatedand statistically analyzed.Results: Side difference revealed that the plaque accumulated on the right sided bands more than the left, howeverthe difference was not significant. It was also found that the lower bands had insignificantly higher amount of plaquethan the upper ones.Conclusions: The four groups of oral hygiene regimens have no significant different effects on the plaque amount.Moreover, the oral hygiene maintenance is more difficult in the right side than the left side but the difference was notsignificant. The lower arch accumulated insignificantly more plaque than the upper. Also, difference in attachmentshas no influence on plaque amount


Article
Root resorption and anti-dentine antibody level in serum and saliva of well-controlled type Ι diabetic patients undergoing orthodontic treatment

Authors: Ayam A. H. Taha --- Esra H. Al- Hashemy
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2013 Volume: 25 Issue: 3 Pages: 134-141
Publisher: Baghdad University جامعة بغداد

Loading...
Loading...
Abstract

Background: Diabetic mellitus type Ι is a metabolic disorder of diverse etiological factors, characterized byhyperglycemia resulting from an absolute deficiency of insulin affected childhood and adolescent. Some of thesepatients seek an orthodontic care .The orthodontist who is treating these medically compromised patients shouldhave a working knowledge of the multitude of medically complex problems. This information will support and enablefor delivery of high standards of dental care in general and orthodontic care in particular. The aim of this study wasto analyze serum IgG levels and salivary secretory IgA (sIgA) levels in human dentine extract (HDE) before (T0) and 6months after (T6) orthodontic treatment and to correlate anti-HDE autoantibodies to root resorption in well-controlledtype Ι diabetic patients.Materials and methods: Sixty individuals, who were attending to Al-Mustansiriya National Diabetes Center from Aprilto October, 2012 and classified as well- controlled type Ι diabetic patients (HbA1c <8.5), were participating in thisstudy .The mean age of the whole samples was (15±1 SD ) years, thirty three of them(18 males and 15 females) werenot wearing orthodontic appliance and were selected as the controls, while twenty seven of them (12 males and 15females) were wearing orthodontic appliance . Periapical radiographs of the upper central incisors , unstimulatedsaliva and serum samples were obtained of all patients before(T0) and 6 months after(T6) orthodontic treatment.Anti-dentine antibody (Ab) levels were determined by mean of enzyme linked immune sorbant assay (ELISA)technique. At T6, root resorption was classified as grade 0 (no resorption), grade 1 (slight resorption), and grade 2(moderate to severe resorption). Chi square test and T- test were used to assess the association between qualitativeand quantitative results respectively ,while paired t- test was used to analyze the results before(T0) and 6 monthsafter(T6) orthodontic treatment. Differences were considered significant at P<0.05.Results: There was statistical significant difference in the level of (anti- dentine Ab) in saliva between the two studygroups at T0 and T6, its level was higher in the wearing group comparing with non wearing group, while it didn’t differin serum. In the wearing group, the level of anti -dentine antibody in serum and saliva significantly decreased at T6comparing with its level at T0. High level of the (anti -dentin Ab) shown in serum and saliva in grade 1 root resorption(R1) comparing with grade 0 root resorption (R0) at T0 and also at T6.Conclusions: The results of this study indicate that the anti -dentin antibody plays an important role in the detectionof root resorption during orthodontic treatment in well- controlled diabetic patients type Ι and its level is differentaccording to the grade of root resorption in both saliva and serum


Article
Effect of orthodontic tooth movement on salivary levels of Interleukin-1beta, Tumor Necrosis Factor-alpha, and Creactive protein

Authors: Noor Saadi --- Nidhal H. Ghaib نضال حسين غايب
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2013 Volume: 25 Issue: 4 Pages: 120-125
Publisher: Baghdad University جامعة بغداد

Loading...
Loading...
Abstract

Background: Orthodontic force is considered to stimulate cells in the periodontium to release many mediators suchas cytokines which play a responsible role for periodontal and alveolar bone remodeling, bone resorption and newbone deposition. Aim of this study was carried out to estimate changes of the (interleukin-one beta, tumor necrosisfactor – alpha and C-reactive protein) levels in unstimulated whole saliva during the leveling stage of orthodontictooth movement.Materials and methods: The sample consisted of thirty adult patients (12 males and 18 females) with ages ranges (19-23) years. Each sample had Class I and Class II malocclusion dental classification and required bilateral extraction oftheir maxillary first premolars, underwent a session of professional oral hygiene and received oral hygiene instructionsbefore and during the period of study, one month later fixed orthodontic appliance were placed in the upper archby using 0.014 nickel titanium arch wire. The unstimulated whole saliva was taken from each sample immediatelybefore placement of the appliance (baseline), and at (after1hour, after one week and after two week) followingplacement of the fixed orthodontic appliance. In addition the plaque index and gingival index were recordedduring the interval periods of this study to assess oral cleanliness. The interleukin – one beta and tumor necrosis factoralphawere determined by enzyme linked immunosorbent assay, while the C-reactive protein was determined bylatex agglutination.Results: The results of the present study found the mean value of both salivary (interleukin-one beta and tumornecrosis factor -alpha) were highest at (after1hour) followed by at (after one week) then at (after two week) thanthe baseline with highly statistical significant differences (P< 0.01) among males, females and total samples, inaddition there were no statistical significant differences between males and females (P>0.05). While the mean valuesof C-reactive protein were higher at (after 1hour) only with highly significant differences (P< 0.01) among femalesand total samples while only significant difference (P<0.05) for males, in addition there were no statistical significantdifferences between males and females. Regarding the correlation between salivary (interleukin – one beta andtumor necrosis factor -alpha), there were positive correlation between them at all periods of study. Moreover therewere positive correlation between salivary (interleukin – one beta and tumor necrosis factor -alpha) and salivary Creactiveprotein. On the other hand there were no association between the salivary (interleukin – one beta andtumor necrosis factor -alpha and C-reactive protein) and clinical parameter (plaque index and gingival index).Conclusion: From this clinical study we conclude that orthodontic force induces increasing the levels of (interleukin –one beta, tumor necrosis factor -alpha, C-reactive protein) in unstimulated whole saliva during orthodontic toothmovement.

Listing 1 - 8 of 8
Sort by
Narrow your search

Resource type

article (8)


Language

English (8)


Year
From To Submit

2013 (8)