Biomedical subjects

Hasan Babacan

Publications and source records attributed to Hasan Babacan.

9 recordsLinked to original sources

PubMed2007

Mesial migration effect on root morphology of mandibular third molars.

OBJECTIVE: To test the hypothesis that there is a relationship between forward mandibular third molar migration and root curvature of the mandibular third molars. MATERIALS AND METHODS: The study is comprised of 64 patients who had a history of unilateral mandibular first molar extraction before 16 years of age with no other missing teeth or prosthetic restorations in the mandible. The extraction space was fully or partly closed. The mean remaining space was 1.1 +/- 0.41 mm. The root angles for the mesial and distal roots of the mandibular third molars were measured on the panoramic radiographs by calculating the differences between the angle formed by the long axis drawn perpendicular to the occlusal plane of the crown of mandibular third molar and the central line of the lower one ninth of the root through the root apex. The differences between the extracted and nonextracted sides for mesial and distal roots were analyzed using a paired sample t-test. RESULTS: Both mesial and distal roots were approximately 8 degrees more vertical on the extraction sides than on the nonextraction sides. The differences were statistically significant. CONCLUSION: Mesial tooth migration of mandibular third molars reduces the amount of root curvature developing on this tooth.

Adolescent↗

PubMed2006

Correction of a mandibular lateral incisor-canine transposition.

Early diagnosis of a transposition can simplify the orthodontic correction. In this report, we describe the orthodontic management of a patient with mandibular right lateral incisor and canine transposition. Nonextraction therapy was performed with removable multibracket appliances. Natural tooth order was attained, and a symmetric and functional Class I occlusion was achieved.

Child↗

PubMed2006

Rapid maxillary expansion and surgically assisted rapid maxillary expansion effects on nasal volume.

The purpose of this study was to compare the effects of rapid maxillary expansion (RME) and surgically assisted rapid maxillary expansion (SARME) on nasal volume using acoustic rhinometric methods. Two groups of subjects were used in the study. Group 1 consisted of 10 subjects (mean age 12.30 +/- 0.82 years) who were treated with RME, and group 2 consisted of 10 subjects (mean age 18.70 +/- 2.54 years) who were treated by SARME. In both groups, all cases had a maxillary width deficiency with bilateral crossbites. Nasal volume records were taken by the same otorhinolaryngologist with an AR device. AR recordings were performed for each patient with and without the use of a decongestant. The first record was taken before expansion, and the second record was taken at the end of retention. The data for both groups were evaluated using Wilcoxon signed rank test and Mann-Whitney U-test. The nasal volume showed a significant increase in both the RME and the SARME groups (P < .05). The measurement with the use of decongestant was similar to that without use of decongestant on the both groups (P < .05), but the different increments in nasal volume between the RME and the SARME groups were not statistically significant. Although the mean ages between the RME and the SARME groups were different, the increase in nasal volume was similar in both groups.

Adolescent↗

PubMed2006

Impacted permanent first molars: two case reports.

Impaction of first permanent molars is an uncommon condition and few cases are reported in the literature. Two cases of a mandibular and a maxillary impacted first permanent molar are presented, their aetiology and treatment alternatives are discussed.

Adolescent↗

PubMed2005

Nasal airway changes due to rapid maxillary expansion timing.

The purpose of this study was to evaluate the effect of rapid maxillary expansion (RME) on nasal minimum cross-sectional area (MCA) using acoustic rhinometry (AR) in two groups of subjects who were treated before and after the pubertal growth spurt. The sample consisted of 29 patients with maxillary constriction and a control sample of 15 subjects. Both samples were divided into two groups according to individual skeletal maturation as assessed by the cervical vertebral maturation (CVM) method. Group I T (early-treated) consisted of 16 patients (eight girls and eight boys). Group I C (early-control) consisted of eight patients, and both groups had not reached the pubertal peak (CVM Stage 1-3). Group II T (late-treated) consisted of 13 patients (eight girls and five boys). Group II C (late-control) consisted of seven patients, and both groups were at a stage during or after the pubertal peak (CVM Stage 4-6). AR records were obtained for each treated subject before treatment (T1), after expansion (T2), and immediately after a three-month retention period (T3); only T1 and T3 records were obtained for controls. The overall increase in MCA was significantly greater in the early- and late-treated groups (group I T, group II T) as compared with the early and late controls. (group I C, group II C) (P < .05). The results of the present study suggest that even the overall (T1-T3) increase for MCA in group I T is greater (0.34 mm) than the increase for MCA in group II T (0.19 mm), but the difference was not significant (P > .05).

Adolescent↗

PubMed2004

A comparison of the effects of rapid maxillary expansion and fan-type rapid maxillary expansion on dentofacial structures.

The aim of this study was to evaluate and compare the sagittal, transverse, and vertical effects of rapid maxillary expansion (RME) and fan-type RME on dentofacial structures. The study group consisted of 34 patients, 14 boys and 20 girls (average age 12.5 years), selected without considering their skeletal class and sex. The fan-type RME group comprised 17 subjects, who had an anterior constricted maxilla with a normal intermolar width. The RME group comprised 17 other subjects, who had a maxillary transverse discrepancy with a posterior crossbite. The records obtained for each patient included a lateral and a frontal cephalometric film, upper plaster models, and occlusal radiograph obtained before treatment (T1), after expansion (T2), and immediately after a three-month retention period (T3). The data obtained from the evaluation of the records before and after treatment, after treatment and after retention, and before treatment and after retention were compared using paired t-test. Further comparisons between the groups were made using Student's t-test. There was significantly greater expansion in the intercanine than in the intermolar width in the fan-type RME group as compared with the RME group. Downward and forward movement of the maxilla was observed in both groups. The upper incisors were tipped palatally in the RME group, but they were tipped labially in the fan-type RME group. There was significantly greater expansion in the nasal cavity and maxillary width in the RME group as opposed to the fan-type RME group.

Biomechanical Phenomena↗

PubMed2004

The role of the headgear timer in extraoral co-operation.

The aim of this research was to study headgear co-operation using an objective measuring instrument, the Compliance Science System (CSS). Forty-six patients were included in the investigation, 32 girls and 14 boys (10-15 years of age; mean 13 years). The patients, who were not informed that they were being monitored, were instructed to wear the headgear, with an electronic module timer attached to the neckstrap, for 16 hours per day. At the end of 2 months (T1), the time for which the headgear was worn was measured. At this stage the patients were divided into two groups: group 1 (unco-operative patients) who wore the headgear for less than 16 hours per day, and group 2 (co-operative patients) who wore the headgear for at least 16 hours per day. Only the unco-operative patients were informed that they had been monitored, and a subsequent 4 month treatment period was initiated for both groups. The time was also measured at the end of the second (T2) and third (T3) 2 month treatment periods. The unco-operative patients increased their use of the headgear to approximately 4.5 to 6 hours per day (P < 0.05). All of the co-operative patients also used their headgear as recommended during the 4 month period.

Adolescent↗

PubMed2003

Pulpal blood flow: effects of corticotomy and midline osteotomy in surgically assisted rapid palatal expansion.

INTRODUCTION/PURPOSE: Surgically assisted rapid palatal expansion is used for the management of transverse maxillary deficiency in the early permanent dentition. The success depends on the maintenance of an adequate blood supply to the mobilized segments. The aim of this study was to assess the effects of corticotomy and midline osteotomy on the tooth pulpal blood flow. MATERIAL: Laser Doppler flowmetry was applied as a non-invasive and reliable technique for the assessment of pulpal blood flow in the maxillary centrals, canines and first molars. The blood flow was investigated pre- and postoperatively, on the first, third, and seventh postoperative days bilaterally in 13 cases. RESULTS: The results of this study indicate that ischaemia of the pulp can occur following osteotomy at the Le Fort I level. CONCLUSION: Corticotomy 5mm above the dental apices and separating the midpalatal suture did not have any serious effect on pulpal blood flow in this study.

Adolescent↗

PubMed2003

Orthodontic and orthopedic treatment of a patient with incontinentia pigmenti.

Incontinentia pigmenti is an uncommon, inherited disorder with predominantly ectodermal manifestations that is associated with skin (100%)), dental (90%), skeletal (40%), central nervous (40%), and ocular (35%) deformities. It is an X-linked dominant disease, usually lethal in males and occurring in female infants. The dental effects include delayed eruption, partial anodontia, microdontia, and cone or peg-shaped teeth. The dental, clinical, and radiological findings in a 16-year-old female are presented here. The patient had peg-shaped teeth and a unilateral maxillary transverse discrepancy associated with oligodontia in the maxillary and mandibular arches. Orthodontic treatment included rapid maxillary expansion and fixed orthodontic therapy for prosthetic purposes and elimination of the functional midline shift.

Adolescent↗