Gholamreza Shirani; Amir Jalal Abbasi; Simin Zahra Mohebbi; AmirHossein Mirhashemi
Abstract
Objective: This study aimed to evaluate the association between orthodontic treatment and success of alveolar cleft bone grafting performed in oral and maxillofacial surgery department of Shariati hospital at least one year after operation.Materials and Methods: The patient’s records and their ...
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Objective: This study aimed to evaluate the association between orthodontic treatment and success of alveolar cleft bone grafting performed in oral and maxillofacial surgery department of Shariati hospital at least one year after operation.Materials and Methods: The patient’s records and their post-operative radiographs were studied to assess their age, gender, cleft type (unilateral or bilateral), grafting time (secondary, tertiary), orthodontic treatment (No, Yes) and height of bony bridge. The success was defined as a proportion of at least ¾ for the remaining bone in new radiograph to post-operative bone bridge height. Results: Mean age of the patients was 18 years with a range of 10 to 29 years. From the total patients, 52% (n=28) were male and 48% (n=26) were female, 54% had unilateral and 46% had bilateral alveolar cleft. Among the patients, 20 cases (37%) had secondary and 34 had tertiary bone grafting. In general, 59% (n=32) of the patients, had successful alveolar bone grafting. Out of the total 54 patients, 28 cases (52%) were under supervision and treatment of orthodontist. Logistic regression model showed that presence of orthodontic treatment was associated with higher graft success. Conclusion: Treatment of Cleft lip and palate needs comprehensive surgical and orthodontic management and all the patients must be under supervision and treatment of orthodontists to take benefit of the surgical treatment.
Valiollah Arash; Abdolmajid Alizadeh
Abstract
Aim: There are currently many patients who need orthodontic treatment. Given the high expense of orthodontic therapy and the fact that orthodontic brackets are recyclable elements, this study was carried out to compare the shear Bond strength of new and recycled brackets in vitro.materials and Method: ...
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Aim: There are currently many patients who need orthodontic treatment. Given the high expense of orthodontic therapy and the fact that orthodontic brackets are recyclable elements, this study was carried out to compare the shear Bond strength of new and recycled brackets in vitro.materials and Method: Thirty healthy extracted first premolars without cracks or decay were selected. the teeth were randomly assigned to two groups and etched by 37% phosphoric acid for 30 seconds. An icy surface was obtained and brackets (018 standard Dentaurum)were assigned equally to two groups of 15 new and recycled brackets each. After 500 round thermo-cycling in temperatures between 5°C and 55°C, shear bond strength was obtained by dividing the force by bracket cross-sector. The Adhesive Remnant Index (ARI) and the Enamel detachment index (EDI) were evaluated.
Results: Average shear Bond strengths for the new and recycled brackets were 17.5717±7.3929 Mpa and 16.6811±5.3899 Mpa, respectively. There were no significant and differences in Bond strength between two brackets. Furthermore, no significant difference was observed in EDI and ARI ratios.Conclusion: With respect to shear Bond strength, recycled brackets may be a viable option for fixed orthodontic treatment in clinical practice.
Ladan Eslamian; Kaveh Alavi; Sanaz Mehdizadeh
Abstract
Aim: Understanding or self-image about beauty of teeth has been considered as the most common reasons for referrals to orthodontic treatment. The aim of this study was to evaluate the Expectations and self-concepts of patients referred for orthodontic treatment in a private office and Shahid Beheshti, ...
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Aim: Understanding or self-image about beauty of teeth has been considered as the most common reasons for referrals to orthodontic treatment. The aim of this study was to evaluate the Expectations and self-concepts of patients referred for orthodontic treatment in a private office and Shahid Beheshti, Dental School.Materials and Methods: To evaluate patient's expectations and self concept, a questionnaire consisting of 13 close and 2 open questions was prepared. To determine whether the problems of patients are realistic, an orthodontist visited all patients and recorded the findings on a structured questionnaire. In addition some variables that might influence the score that Petients and recorded to evaluate their own dental beauties were analyzed. To analyze the data, Chi-square, t test, ANOVA, Kappa statistic and multi-variable linear regression model were used.Results: Totally 252 individuals (92 males and 160 females) were evaluated. The girls thought treatment times was longer and the cost was very higher. One- third thought they need other dental treatment. The patients were often sent by doctors or dentist than their friends or family. 24.4% of patients who had TMD problems, mentioned them as the cause of their orthodontic treatment. The patients grades to selected C1 I pictures, had significant differences with each other (P<0.001).Conclusion: The individuals image of his teeth was influenced by external, functional and social factors.
Allahyar Geramy; Reza Jelodar; Hasan Salehi
Abstract
Aim: The aim of this study was to assess the effects of different loop forms in continuous arch technique on its force characteristics in the anterior retraction arch wires.Material and Method: Six 3D finite element models were designed of an anterior retraction arch wire formed and included four average ...
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Aim: The aim of this study was to assess the effects of different loop forms in continuous arch technique on its force characteristics in the anterior retraction arch wires.Material and Method: Six 3D finite element models were designed of an anterior retraction arch wire formed and included four average sized anterior brackets and the palatal wall of the bracket slot of the canines. The models were similar except for the height and angle of the loop legs. The left side loop was kept constant in all stages of the study while modifying the right side loop height or vertical leg's angulations. SolidWorks 2006 was selected for the modeling phase and ANSYS Workbench Ver. 11.0 for the calculations. Mesializing force on molar, medially directed force on canine, and anterior retraction forces were evaluated.Results: According to the results, loop height in one side cannot affect the other side loop force characteristic directly; A gradual increase of the force difference between two side of the anterior retraction arch wire is shown. The mesializing force on molar is also increased with almost the same manner. The other findings related to loop leg divergence shows a difference between two sides but the differences are almost the same with varying degrees of divergence. Although the forces are not the same in both sides but the difference remained almost constant.
Conclusion: Arch wires may seem to be symmetric but may act asymmetric. Difference in anterior teeth retraction may be due to some asymmetries in arch wire fabrication which needs further considerations.
Tahereh Hosseinzadeh-Nik; Shahin Nouroozi; Darab Gholami-Borrujeni; Negin Shahsavari
Abstract
Objective: An orthodontic treatment planning program in a specific society requires information on the orthodontic treatment needs of the population. The aims of this study were to compare the student, parent and clinician normative need and demand for orthodontic treatment between 12 and 17 years old ...
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Objective: An orthodontic treatment planning program in a specific society requires information on the orthodontic treatment needs of the population. The aims of this study were to compare the student, parent and clinician normative need and demand for orthodontic treatment between 12 and 17 years old groups in a sample of Iranian students using the IOTN.
Material and Methods: A sample of 846 students including 419 students of 12 years old and 427 students of 17 years old was selected randomly from schools in Abade. A questionnaire of family socioeconomic status was proposed to the parents. All the students were examined according to the Aesthetic and Dental Health components (AC and DHC) of Index of Orthodontic Treatment Need. Students' and parents' perceived need was also assessed using AC. Then the measurements of IOTN in both groups were compared in each component and the demands of each group were also compared with each other.
Results: According to DHC classification, 22.3% of 12 years old students and 18.7% of 17 years old students were categorized in the "no need" group; 29.5% of 12 years old and 35.6% of 17 years old students in the "border line" group and 48.2% of 12 years old group and 45.7% of 17 years old group in the "definite need" group. According to AC, in 12 years old students, the "no need", "border line" and "definite" groups included 61.9 %, 29% and 9.1% of students in turn. On the other hand, the same categories in 17 years old students assessed by the dentist were 66%, 30.2% and 3.7% respectively. (p<0.05).
Conclusion: The treatment need based on DHC and AC scores of IOTN did not differ between 12 and 17 years old groups significantly but the demand for orthodontic treatment in "definitive need" category was more in 12 years old group.
Susan Sadeghian
Abstract
Aim: The purpose of this study was toevaluate the relationship between the ultrasonographic thickness of masseter muscle and the width of dental arches.Materials and Methods: The sample comprised of 44 persons (22males, 22females), who did not undergo orthodontic treatment and they had at least 28 teeth ...
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Aim: The purpose of this study was toevaluate the relationship between the ultrasonographic thickness of masseter muscle and the width of dental arches.Materials and Methods: The sample comprised of 44 persons (22males, 22females), who did not undergo orthodontic treatment and they had at least 28 teeth with CL 1 occlusion. The thickness of the masseter muscle was measured ultrasonografically with the muscles both in relaxation and under contraction. Maxillary and madibular inter-molar and inter-canine width were measured with an digital caliper for the distance between the palatal surfaces of the permanent first molar and cingulumes of canines.Results: There was a significant association between mandibular inter-molar width and sex (PV=0.037). Masseter muscle thickness in both sides and either in relaxation or contraction showed a direct significant association with sex (PV=0.001). Maxillary inter-molar and inter- canine and mandibular inter-canine width showed a direct significant association with masseter thickness during contraction in tight side (PV=0.037), whereas in relaxation no statistically significant relationship was found (PV =0.07).Conclusions: The fmdings of this study indicated that the thickness and functional capacity of the masseter muscle may be considered as one of the factors influencing the width of the maxillary dental arch and inter canine mandibular dental arch width.
Zohre Tabatabaei; Mohammad Danesh Ardakani
Abstract
Failure of multiple teeth eruption is a rare dental anomaly. Various local, systemic or genetic factors implicated in this condition, or it may be an Idiopathic phenomenon. Here we describe an Iranian young female with multiple teeth impaction who is free from any systemic disease or syndromic condition. ...
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Failure of multiple teeth eruption is a rare dental anomaly. Various local, systemic or genetic factors implicated in this condition, or it may be an Idiopathic phenomenon. Here we describe an Iranian young female with multiple teeth impaction who is free from any systemic disease or syndromic condition. This patient was managed successfully by interdisciplinary treatment. Based on clinical presentation and radiographic examination this paper discusses the differential diagnosis and management of this case.
Mohammad Hossein Toode Zaeim; Soghra Yassaei; Hoori Mir Mohamad Sadeghi; Valiollah Rafiei
Abstract
Aim: A high percentage of the problems in finishing phase are due to tooth size imbalances that can be diagnosed in initial stages of treatment. The purpose of present study is to evaluate the frequency of anterior tooth size discrepancies by Bolton Analysis among class I, II and III malocclusions.Materials ...
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Aim: A high percentage of the problems in finishing phase are due to tooth size imbalances that can be diagnosed in initial stages of treatment. The purpose of present study is to evaluate the frequency of anterior tooth size discrepancies by Bolton Analysis among class I, II and III malocclusions.Materials and methods: The mesio-distal widths of six anterior teeth in 90 paired casts of patients (class I, II, and III), who were selected non-randomly, were measured. Chi-square test was performed to compare the frequency of anterior tooth size discrepancies between the three malocclusion groups. Analysis of variance was used to compare the mean anterior Bolton ratios as a function of skeletal anterior-posterior malocclusions and both genders. Mean mesio-distal width of six anterior teeth were compared by Analysis of variance in 3 skeletal malocclusion groups. Statistical differences were determined at the 95% confidence level.Results: Discrepancy was greater in class I and III than in class II. No sex difference was shown to exist in Bolton anterior ratio. mesio-distal width of upper laterals had greater variation coefficient.
Conclusion: Difference of mean anterior tooth size discrepancies among three skeletal class I, II and III malocclusions were not statistically significant.
Masoud Davoudian
Abstract
Introduction: Cephalometric radiographs have become an indispensable tool in the orthognathic setting. Traditionally, cephalometric images have been analyzed by manually tracing the radiograph, which was time-consuming. The development of computer technology has made digital tracing possible. The purpose ...
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Introduction: Cephalometric radiographs have become an indispensable tool in the orthognathic setting. Traditionally, cephalometric images have been analyzed by manually tracing the radiograph, which was time-consuming. The development of computer technology has made digital tracing possible. The purpose of this study was to examine and compare the reliability and reproducibility of digitization using Viewbox imaging software (version 3.0) with traditional manual technique.Materials and methods: The sample consisted of cephalograms from 30 randomly selected patients after orthodontic treatment. Twenty one cephalometric measurements calculated by 1 operator, both manually and with digital tracing software. Measurement error was assessed for each method by duplicating measurements of 15 randomly selected radiographs and by using Pearson's coefficient of determination. A paired t-test was used to detect differences between the manual and the digital method.Results: An overall greater variability in the digital cephalometric measurements was found. Differences between the two methods for saddle angle, gonial angle, nasolabial angle and upper lip to E line were statistically significant (P<0.05), but the last one showed a mean difference lower than two units.Conclusions: The two tracing methods provide accurate and similar clinical results except for some measurements, especially nasolabial angle; therefore, version 3.0 of this digital cephalometric software can be reliably chosen as a routine diagnostic tool with knowledge of its limited errors.
Ahmad Sodagar; Sepideh Arab
Abstract
Aim: Accurate information about the normal dentofacial pattern of the patients' ethnic group is of critical importance for diagnosis and treatment planning. The aim of this study was to determine hard tissue cephalometric norms for Iranian adolescents.Materials and Methods: Cephalometric radiographs ...
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Aim: Accurate information about the normal dentofacial pattern of the patients' ethnic group is of critical importance for diagnosis and treatment planning. The aim of this study was to determine hard tissue cephalometric norms for Iranian adolescents.Materials and Methods: Cephalometric radiographs of 60 Iranian adolescents (38 girls and 22 boys) were analyzed regarding 4 common cephalometric analyses. Mean values and standard deviations were compared with those of original analyses.Results: Average Iranian adolescents revealed more protrusive maxillary and mandibular incisors, flatter mandibular plane with a tendency to deep bite and more acute gonial angle. SNA and SNB were less in Iranian sample. In addition, posterior to anterior facial height ratio was higher in Iranians.Conclusion: Some hard tissue cephalometric norms are specific for racial groups. More protrusive incisors in Iranians might indicate more possibility of non-extraction treatment planning for this population.
