Mohammad Karim Soltani; Sadegh Barkhori; Yoones Alizadeh; Farzaneh Golfeshan
Abstract
Background: Brackets’ debonding without any damage to the teeth is very important.
Objectives: The aim of this study was to compare the debonding characteristics of the metal conventional and self-ligating brackets.
Patients and Methods: 69 maxillary premolars were randomly assigned in 3 groups. ...
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Background: Brackets’ debonding without any damage to the teeth is very important.
Objectives: The aim of this study was to compare the debonding characteristics of the metal conventional and self-ligating brackets.
Patients and Methods: 69 maxillary premolars were randomly assigned in 3 groups. Metal brackets of Damon, In Ovation and conventional systems were bonded to the teeth. The brackets were debonded with debonding pliers. Debonding strengths, adhesive remnant index, and enamel damage were evaluated. A Zwick model universal testing machine was used to measure debonding strengths. The debonding strength values were statistically analyzed by one sided analysis of variance while the increase in the enamel crack numbers and length and the remained adhesive index were analyzed by chi-square test.
Results: The means of the debonding strength in the brackets of in ovation, damon and conventional systems were 15.22, 11.4 and 8.67 MPa respectively. Significant differences were observed regarding debonding strength between three types of brackets (all: P < 0.001). After debonding of in ovation, damon and stainless steel brackets; the increased numbers of the enamel cracks were noted in 26.06%, 21.74% and 17.39% cases respectively. Also, the increased cracks lengths were demonstrated in 47.83%, 39.13%, and 30.43% cases. No significant differences were observed regarding the increase of the enamel cracks number and length and the amounts of residual adhesive on the teeth.
Conclusions: The debonding characteristics of the metal self-ligating were comparable to the conventional brackets.
Navid Hosseini; Saeide Talezade; Soghra Yassaie; Zahra Moradi
Abstract
Background: Many studies have been conducted in Iran to know the prevalence of malocclusions and orthodontics needs but no study so far has been conducted in Yazd.
Objectives: The aim of this study was to determine the prevalence of anterior open bite (AOBO) among 11 - 12 years old school-aging children ...
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Background: Many studies have been conducted in Iran to know the prevalence of malocclusions and orthodontics needs but no study so far has been conducted in Yazd.
Objectives: The aim of this study was to determine the prevalence of anterior open bite (AOBO) among 11 - 12 years old school-aging children in Yazd, Iran.
Patients and Methods: A total number 550 (278 boys and 272 girls) school aging children between 11 - 12 years old with permanent dentition were selected in this study from Yazd, Iran. The subjects were randomly selected, and none had received previous orthodontic treatment. Clinical examinations were carried out by one trained and calibrated examiner. The occlusal anteriorposterior sagital relationship were assessed based on the angle classification and also the vertical anterior relationship. The statistical software SPSS version 22 was used for the analysis different parameters as gender and age.
Results: AOB was present in 2.9% of subjects. 2.1% of the male and 3.6% of the females students in the sample were affected with anterior open bite. The prevalence of class I, class II and class III malocclusion with AOB was 1.7%, 3.2%, 21.4%, respectively.
Conclusions: This study shows that 2.9% of children examined had anterior open bite malocclusion which required treatment.
Fariborz Jafarpour; Gary A. Estomaguio; Elaheh Vahid Dastjerdi; Sepideh Soheilifar
Abstract
Background: Facial morphology of Asians differs from those of whites and blacks. However, none of the available studies had assessed nasal morphology in Asians with different skeletal malocclusions.
Objectives: The aim of this study was to compare cephalometric nose morphology among Filipino female ...
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Background: Facial morphology of Asians differs from those of whites and blacks. However, none of the available studies had assessed nasal morphology in Asians with different skeletal malocclusions.
Objectives: The aim of this study was to compare cephalometric nose morphology among Filipino female and male adults with skeletal class I, II and III relationship.
Patients and Methods: All patients were of Filipino background and had a lateral cephalogram as part of orthodontic records. Upper and lower facial height, nose height, nose length, nose tip projection, were measured in cephalograms.
Results: Facial height did not differ significantly in genders and malocclusions. There was not any statistically significant differences in linear measurement of the nose among various malocclusion, while, nose length and height were greater in males and nose tip projection was larger in females.
Conclusions: Filipino males have longer nose with less prominent tip in comparison with females. Angular measurements of nose are larger in class II malocclusion in comparison with class I and class III.
Mahtab Nouri; Sohrab Asefi
Abstract
Introduction: The role of nasal septum in development of the maxilla after birth remains to be a question. Study of monozygotic twins may elucidate the role of epigenetic factors in growth and development of craniofacial structures.
Case Presentation: Herein, we report a case of 16 year-old male monozygotic ...
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Introduction: The role of nasal septum in development of the maxilla after birth remains to be a question. Study of monozygotic twins may elucidate the role of epigenetic factors in growth and development of craniofacial structures.
Case Presentation: Herein, we report a case of 16 year-old male monozygotic twins with Angle class III malocclusion and high angle facial pattern. One of them (patient M.H) had a history of mid-face trauma at the age of 6. Radiographic and clinical examinations revealed significant nasal septum deviation and the patient demonstrated nasal airway obstruction on the right side. The effects of this traumatic injury and the consequences of septal deviation were evident both clinically and radiographically at the age of 16. Increased airway resistance caused by septal deviation significantly affected the arch form and the configuration of the nose. The overall facial growth pattern is predetermined genetically but vertical dimension of the face may be more influenced by the environmental factors.
Conclusions: Patients should be carefully monitored after trauma to the nose and face and any deviation in the facial structure should be treated promptly in order to prevent asymmetries.
Valiollah Arash; Farhad Sobouti; Sina Haghanifar; Iman Dabbaghian; Ali Bijani; Reza Alizadeh Navaei
Abstract
Background: Maxillary molar distalization with intraoral or extraoral appliances is a common treatment modality in non-extraction treatment plan.
Objectives: In this study, an appliance with hyrax screw was used for maxillary molar distalization. Our purpose was to evaluate the amount of molar distalization, ...
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Background: Maxillary molar distalization with intraoral or extraoral appliances is a common treatment modality in non-extraction treatment plan.
Objectives: In this study, an appliance with hyrax screw was used for maxillary molar distalization. Our purpose was to evaluate the amount of molar distalization, type of molar movement, effects on anterior teeth, and amount of changes in lower anterior facial height.
Patients and Methods: 24 class II patients (13 females, 11 males) with bilateral half cusp class II molar relationship were participated. The appliance was made by hyrax screw for producing distalization force. Pre and post distalization lateral cephalometric radiographs and dental casts were evaluated. Lateral cephalograms and study models were obtained before treatment and after 12 weeks activation of the appliance (one turn per week).
Results: Cephalometric measurement demonstrated that, first molars tipped 2.9 degrees and displaced 1.76 mm. First premolar and upper incisor tipped 3.4 and 4.2 degrees, displaced 2.9 and 2.4 mm respectively. All of these results were statistically significant. The mean of maxillary first molars distaliztion was 2.6 mm per side in approximately four month. The mean of first maxillary molars tip was 3.93˚ and the mean of anchorage loss at the first premolars was 1.95 mm, but the crowns tipped 3.45˚ mesially. Lower anterior facial height (ANS-GN) and mandibular plan angle (GO-GN) increased, 0.7 ± 0.21 mm and 0.76 ± 0.32 degree, respectively, but were statistically insignificant.
Conclusions: It can be concluded that proposed appliance can correct class II molar relationship. Molars displaced distally by bodily movement and tipping.
Aydin Sohrabi; Ali Rafighi; Seyed Hossein Moslemzadeh; Saeid Foroughi Moghaddam; Farzaneh Rasouli
Abstract
Background: After completion of orthodontic treatment, the retention phase is necessary for premolar teeth to preserve them in an ideal esthetic and functional relationship and to counteract the inherent tendency of teeth to return to their previous positions. Different fixed and removable retainers ...
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Background: After completion of orthodontic treatment, the retention phase is necessary for premolar teeth to preserve them in an ideal esthetic and functional relationship and to counteract the inherent tendency of teeth to return to their previous positions. Different fixed and removable retainers are used to prevent relapse in the anterior segment of the dental arch. Retainers that are bonded to 6 anterior teeth, i.e. flexible spiral wires (FSW), are more commonly used. In addition, extended bonded retainers are used to keep the extraction space closed, which are bonded to premolars in addition to anterior teeth. In orthodontic treatments involving tooth extraction, the inability of retainers to prevent the re-opening of the extraction space will result in some periodontal and occlusion problems and patient dissatisfaction.
Objectives: Therefore, the present study evaluated the ability of extended fixed retainers in comparison to FSW retainers, along with overnight use of removable retainers, to prevent re-opening of the extraction space.
Patients and Methods: Thirty-one patients (60 quadrants) were included in this study after obtaining informed consent. Convenient sampling technique was use to assign patients to two group with 13 and 27 quadrants. In group 1, an extended fixed retainer (from the second premolar on one side to the second premolar on the other side) and in group 2 FSW retainer (from the canine tooth on one side to the canine tooth on the other side) in association with overnight use of Hawley plaque were administered. Opening of the interdental space was evaluated by measuring the distance between the mandibular second premolar and first molar on each side in both groups using a leaf gauge at baseline and 2 and 6 months after placing the retainers in the oral cavity. Wilcoxon’s test was used to compare the spaces between the mandibular second premolar and first molar in each group at each time interval. Mann-Whitney U test was used to compare changes in interdental spaces between the two retainer types.
Results: The interdental spaces decreased from the time of debonding up to two months after debonding, which was statistically significant in the FSW + Hawley group (P = 0.21). During the next 4 months, the space remained unchanged in the extended FSW group and slightly increased in the FSW + Hawley group, which was not significant. In general, the interdental space decreased from the debonding session up to six months later, which was not statistically significant (P = 0.91).
Conclusions: Both extended fixed retainer and fixed retainer in association with the overnight use of Hawley restrainer were successful in keeping the extraction space closed in fixed orthodontic patients during the first 6 months.
Ankita Ashok Sawant; Shubhangi Ameet Mani
Abstract
Background: It is generally believed that a straight profile is more attractive than a convex class II or concave class III profiles, however, there are certain gender differences, as slightly convex facial profiles are considered attractive in females, while straighter profiles are preferred in males.
Objectives: ...
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Background: It is generally believed that a straight profile is more attractive than a convex class II or concave class III profiles, however, there are certain gender differences, as slightly convex facial profiles are considered attractive in females, while straighter profiles are preferred in males.
Objectives: The goal of this study was to compare facial profile attractiveness changes of patients treated with twin block appliance assessed by orthodontist and other dental specialist.
Patients and Methods: The patient sample comprised 10 patients who undergo orthodontics treatment with Twin Block appliance. Triplets of facial profile photographs of the patients were randomly divided into two sets (before T0, after treatment T1). Two groups selected: 10 orthodontist and 10 dental specialist from different other branches (Excluding oral maxillofacial surgeons) in rural dental college were selected. Each judge independently ranked both sets of photographs using visual analog scale (VAS) with an interval of 1 week between ratings.
Results: On average, both orthodontists and other dental specialist found an improvement in facial profile attractiveness through Twin Block appliances treatment (VAS- T0 - T1 = 1.4 ± 3.2 cm). However, the individual perception of attractiveness varied greatly in the two groups. For time periods (T0- T1), lower VAS ratings were given by other specialist than by orthodontists.
Conclusions: Other dental specialist rated facial profiles more critically than orthodontist. Twin block therapy in patients generally improves profile attractiveness, which is appreciated by all dentists.
Nasrin Farhadian; Amirfarhang Miresmaeili; Vahid Mollabashi
Abstract
Introduction: Complications to force eruption of impacted teeth may arise from several reasons including ankylosis, dilaceration, and/or some barriers in the eruption pathway. Treatment time prolongation without obvious clinical progress gradually decreases the patient compliance. In this paper we present ...
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Introduction: Complications to force eruption of impacted teeth may arise from several reasons including ankylosis, dilaceration, and/or some barriers in the eruption pathway. Treatment time prolongation without obvious clinical progress gradually decreases the patient compliance. In this paper we present a non-conventional method to forced eruption of an impacted maxillary canine.
Case Presentation: A-21-year old girl presented with missing of teeth No 17, 12, 22, 27, 38, 37, 47, 48 and labially impaction of both maxillary canine was prepared for treatment through apically position flap for exposure of the both canines. Using standard edgewise 0.18 appliance and conventional elastic traction the right maxillary canine erupted to its normal position after about 18 months but the other tooth had not responded favorably to this technique. There was no signs of ankylosis, a titanium bone screw was placed in the labial cortical bone and mesial of the malposed canine. A spring is made of 0.017” × 0.025” SS wire with two helixes that delivered about 100 g force and 400 gr.mm activation moment to labial bracket on malposed canine crown. The force exerted on mini implant will be balanced with a force and moment on malposed tooth very similar to type IV Burston classification. After about 5 months the tooth had reached to its final occlusal position.
Conclusions: The appliance used for this patient brought the impacted canine into the arch without any more force on the neighbor teeth. Two point contact of the spring arm by bending the wire over the head of the mini implant made it possible to apply buccolingual crown torque.
