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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: 25 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
Frictional Resistance in Self-ligating Orthodontic Brackets and Conventionally Ligated Brackets (An In Vitro Study)

Authors: Fadhil Y Jasim --- Lara R Al-Banaa
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2013 Volume: 13 Issue: 23 Pages: 524-529
Publisher: Mosul University جامعة الموصل

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Abstract

This study was aimed to compare static frictional forces generated by 3 types of brackets (conventional, active self-ligating and passive self-ligating) combined with 3 different sizes of stainless steel wire. Material and Methods: The sample consisted of three types of brackets (Equilibrium 2, Empower, discovery sl) with a slot size 0.022 inch were coupled with 0.020, 0.018×0.025 and 0.019×0.025 inches stainless steel wires, The testing model consists of 6 brackets used to represent lower anterior teeth. Ten tests were carried out for each group of bracket-wire combination in dry state, frictional force were measured by tensile testing machine. A significant P value of 0.05 was predetermined. Results: self-ligating brackets produced significantly lower value (P ≤0.05) of mean of static friction than elastomerically tied conventional bracket. The frictional force increased proportionally to the wire size. Conclusions: The method of ligation appears to be the primary variable responsible for the frictional resistance generated by these types of brackets

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