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Article
The laboratory dental cutting rates in comparison with the clinical dental cutting rates and the cutting rates on a new suggested training block

Author: Angham Ghiath Al-Hashimi انغام غيث الهاشمي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2012 Volume: 24 Issue: 1 Pages: 1-5
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Preclinical cavity preparation performed in the laboratory on different types of typodont mannequinteeth that keep changing in chemistry and properties by the manufacturer ,while clinical cavity preparationperformed on natural teeth of well known chemistry and properties without a transitional format, the aim of thisstudy was to compare the laboratory dental cutting rates with the clinical dental cutting rates and the cutting rateson a new suggested transitional training blockMaterials and methods: the cutting rates were evaluated on 30 artificial teeth and 30 natural teeth the roots weresectioned and the crowns were embedded in acrylic blocks (25x25x15 mm) exposing the flat labial surface, thespecimens were divided according to the cutting equipment and the type of the exposed labial surfaces into:Group 1: the previous laboratory dental cutting (10 original Frasaco/Nissin dental product)Group 2: the current laboratory dental cutting (10 Frasaco Dent Iran)Group 3: dental cutting on anew suggested training block (10 denture teeth –Pigeon teeth China)Group 4: low speed clinical dental cutting (10 dentin specimens)The cutting was performed in all the above groups with stainless steel fissure bur and low speed hand pieceGroup 5: high speed clinical dental cutting on dentin (10 dentin specimens)The cutting was performed with carbide fissure bur and turbineGroup 6: high speed clinical dental cutting on enamel (10 enamel specimens)The cutting was performed with diamond fissure bur and turbine.The cutting rates (mm/sec)were recorded and statistically analyzed using ANOVA test and t-testResults: the results showed there was no significant difference between group 3and the mean of the clinical dentalcutting (group 4, 5&6),a significant differences were presented between group 1Vs group 3 and between group 1 Vsthe mean of the clinical dental cutting(group 4,5&6),while group 2 showed a highly significant difference Vs group 1and a very highly significance difference Vs group 3 and the mean of the clinical dental cutting(group 4,5&6)Conclusion: The previous laboratory dental cutting was much closer to the clinical dental cutting (slightly slower)While the current laboratory dental cutting far away (too fast)from the clinical dental cutting .Furthermore the dentalcutting on the new suggested training block comparable to the clinical dental cutting


Article
Effect of Lace Back on Amount of Anchorage Loss Using Labial and Lingual Technique. (An in vitro Study)

Author: Omar H AL-Luazy
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2013 Volume: 13 Issue: 26 Pages: 366-371
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: Evaluate the amount of anchorage loss of the lower posterior teeth 2nd premolar and first molar when used as anchorage teeth for retraction of canine bilaterally by using lace back technique after extraction of first premolar in sever crowding cases. Materials and Methods: Two groups of brackets, one of them labial (conventional) were bonded on the labial aspect of metal teeth except 4 4 typodont by special adhesive and other groups lingual brackets also bonded in the same teeth lingual surface and two types of light or low gauge arch wire Niti , twisted multi strand for sliding the canines retraction by using elastomeric ring with ligature wire active lace back once with labial and other with lingual technique. Results: There is no significant difference between twisted multi strand wire when ligated on the teeth in both lingual technique and labial technique. Significant difference when used Niti wire on lingual technique when compared with the same type of wire when ligated on labial technique and significant difference with twisted multi strand when ligated on teeth in lingual technique. Conclusion: Anchorage loss decreases with twisted multi strand wire because the friction increased between arch wire and base of bracket in both labial and lingual technique and decreased with Niti wire specially when used in lingual techniques .

Keywords

Typodont --- Friction --- Anchorage --- Lingual --- crowding.


Article
Effect of Bracket’s Slot Size on Canine Position and Space Closure Rate (A Typodont Study)

Authors: Khudair A Al-Jumaili --- Abdulrahman I Ali
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2014 Volume: 14 Issue: 28 Pages: 60-69
Publisher: Mosul University جامعة الموصل

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Abstract

This study aimed to determine the effect of newly introduced 0.020” slot size brackets on di-mensional positions and space closure ratio of mandibular canine. Material and Methods: The study includes six groups according to slot sizes (0.018”, 0.020” and 0.022”) and materials of canine retrac-tion (elastomeric power chain and closed coil spring). A 200 gm of retraction force was used on 0.017” X 0.025” stainless steel wire ligated to brackets by elastomeric ligatures along 13 mm available space. After immersion of the typodont in water bath with (50-55) C for 5 minutes, the rate of space closure were measured in millimeter using vernier (from the distal wings of canine bracket and the mesial wings of the second premolar), In both vertical and horizontal directions, digital images were taken by camera and the angle between canine extension bar )C B) and bite plane extension bar (BPB) was measured by protractor to determine tipping and rotation.Results: The results showed that 0.022” slot bracket groups had highest amount of rate of space clo-sure tipping and rotation, while 0.020” slot brackets groups had higher space closure rate than 0.018” slot brackets groups. Conclusions: bracket slot 0.022” groups showed higher tipping, rotation and space closure rate, while 0.020” slot brackets groups had higher rate of space closure with same or bet-ter rotation and tipping control in comparison with 0.018” slot bracket groups


Article
A Comparative Assessment of Space Closure Utilizing by Lingual and Conventional Brackets

Authors: Omar H. Alluazy --- Hakam H. Sabah --- Saba H. Al–Zubaidi --- Mustafa M. Al-Sultan
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2014 Volume: 14 Issue: 29 Pages: 220-227
Publisher: Mosul University جامعة الموصل

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Abstract

AIMS:To assess the effect of system type on the amount of space closure when equal force use on each system and to compare the amount of rotation and tipping generated by lingual and conventional brackets. Materials and Methods: A mandibular typodont system with Class I wax form and set of metal teeth were used in this study. After removing the second premolar bilaterally, each tooth of the anterior teeth and canines were bonded with two bracket systems , preadjusted Roth stainless steel 0.022x0.030 inch conventional (labial) brackets (CoBS group) and lingual brackets (LiBS group) except right first premolar were bonded with lingual bracket (LIBS group) and left first premolar were bonded with labial bracket (CoBS group). Bite plane extension bar (BPB) and canine extension bar (CB) were constructed bilaterally for the measurement of first premolars tipping and rotation. A 200gm. of force applied by close coil spring to retract the first premolars bilaterally . After immersion of the typodont in water bath with 50-550 C for 5 minutes, the rate of space closure , tipping and rotation of first premolars were measured. Results: A statistical analysis (independent-samples t-test) used in this study, there was a significant difference between the two system groups (CoBS group and LiBS group). The LiBS group had a significant higher amount of tooth movement, and higher degree of rotation. For the tipping, the CoBS group had the higher level of tipping with a non-significant difference with LiBS group. Conclusions: The outcomes of this study showed that the higher rate of space closure and rotation were associated with LiBS group, while there is a nonsignificant difference in the amount of tipping between the two groups. So, Lingual appliance was appeared to be very effective method for tooth sliding during fixed orthodontic treatment.


Article
Determination of the Effect of Conventional Elastomeric Ligature of Different Ligation techniques versus Nonconventional type on Canine Position using Frictional Mechanics (Typodont Study)

Author: Zaid S Tawfek
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2013 Volume: 13 Issue: 26 Pages: 358-365
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: To evaluate the effect of different ligature types and ligation techniques on the rate of space closure, tipping and rotation of canine after sliding. Materials and Methods: The total number of the samples were 50 sample classified under five groups according to the method and type of ligation; the first group: preformed stainless steel ligature wire (SL), the second group: preformed stainless steel kobayashi ligature wire (KL), the third group: elastomeric ligature in figure – O (EO), the fourth group: elastomeric ligature in figure – 8 (E8) and the fifth group: non-conventional Slide Leone elastomeric ligature (NE). A typodont used in this study with preadjusted Roth stainless steel brackets 0.022×0.030 inch and a stainless steel orthodontic arch wire 0.017×0.025 inch. A bite plane extension bar (BPB) and canine extension bar (CB) are constructed for the measurement of canine tipping and rotation. A 180 gm. of force applied by short continuous elastomeric power chain to retract the right canine. After immersion of the typodont in water bathe with 50-55 0C for 5 minutes, the rate of space closure were measured in millimeter using vernier (from the distal wings of canine bracket and the mesial wings of the second premolar), the tipping and rotation were measured by taking a photograph to the typodont using digital camera, with transvers projection (for tipping) and occlusal projection (for rotation) from right side (directly toward the right canine), then the angle between (BPB) and (CB) measured directly on the photograph using Protractor. Results: A statistical analysis (descriptive statistics, ANOVA and Duncan Multiple Analysis Range Test) used in this study, for the rate of space closure the results showed that there is a significant difference between the five groups at p ≤ 0.001, the NE group had the highest amount of tooth movement while KL group had the lowest level, for the tipping; the NE group had the highest level of tipping while SL, KL and E8 groups had the lowest level with a non-significant difference between them, for the rotation; the results showed that NE group had the highest level of rotation, while KL group had the lowest level. Conclusions: The higher rate of space closure, the higher rotational degree and the higher tipping degree were associated with NE group, while KL group had shown the lowest rate of space closure and the lowest rotational degree. The lowest degree of tipping was associated with the SL, KL and E8 groups.

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