İbrahim Yavuz

Investigation of the Changes in the Positions of Upper and Lower Incisors, Overjet, Overbite, and Irregularity Index in Subjects with Different Depths of Curve of Spee

The aim of this study was to investigate the relationship between the depth of the curve of Spee and positions of upper and lower incisors, overjet, overbite, and anterior lower crowding. The material consisted of lateral head films and dental casts of 137 untreated adolescent subjects, 76 girls and 61 boys, aged 13 to 16 years. The subjects were divided into three groups with normal Spee, flat Spee, and deep Spee and were compared with one another. Differences between the Spee groups and between sexes were assessed by means of analysis of variance and a post hoc multiple comparison test. In addition, correlation coefficients between the depth of curve of Spee and other variables were calculated. Finally, cephalometric measurements for all subjects were subjected to a multiple regression analysis, with the depth of curve of Spee as the dependent variable. The results showed that there were no statistically significant differences in the positions of upper and lower incisors and anterior lower crowding among the Spee groups. However, overjet and overbite demonstrated significant differences among the groups. Statistically significant correlations were found between the depth of curve of Spee and overjet and overbite. Multiple linear regression analysis revealed that chronological age and all other variables used in the study could account for only 28.7% of the total variance of the curve of Spee. The overbite alone explained 17.3% of the total variance of the curvature.

Longitudinal Posteroanterior Changes in Transverse and Vertical Craniofacial Structures Between 10 and 14 Years of Age

Longitudinal growth changes in the transverse and vertical craniofacial dimensions occurring between 10 and 14 years of age were evaluated in 22 female and 23 male subjects. All subjects were healthy, had a clinically acceptable occlusion, and had not received orthodontic or orthopedic therapy before. Serial cephalometric radiographs were taken at ages 10, 11, 12, and 14 years. In studying the P-A cephalograms, seven transverse and five vertical measurements were used. The effects of age and sex on the transverse and vertical growth of the craniofacial structures were investigated by means of analysis of variance and Bonferroni multiple comparison test. The results of the study revealed that all measurements studied were affected by age, and cranial, facial, nasal, and maxillary widths were affected by sex. The most pronounced age-related increases occurred in the mandibular width for transverse measurements and in the total facial height for vertical measurements in both sexes during this study.

Face mask therapy effects in two skeletal maturation groups of female subjects with skeletal Class III malocclusions.

OBJECTIVE To examine the effects of face mask therapy in adolescent and young adult female subjects with skeletal Class III malocclusion characterized by maxillary retrognathism. MATERIALS AND METHODS The material consisted of pretreatment and posttreatment lateral cephalometric radiographs of 28 subjects with Class III malocclusions treated with a face mask. Twenty-eight patients age 10 to 16 years were divided into two groups: the adolescent group (15 female patients) and the young adult group (13 female patients). Within group and between group comparisons were made by paired t-test and Students t-test, respectively. RESULTS Forward displacement of the maxilla and clockwise rotation of the mandible occurred in both the adolescent and young adult groups. Maxillary-mandibular relationship exhibited an increase in the ANB angle and Wits appraisal, and the soft-tissue changes resulted in a more convex profile. The maxillary incisors moved forward while the mandibular incisors moved backward. CONCLUSIONS Face mask therapy improves skeletal Class III malocclusions by a combination of skeletal and dental changes. Although early treatment may be most effective, face mask treatment can provide a viable option for older children as well.

Nonsurgical rapid maxillary expansion effects on craniofacial structures in young adult females. A bone scintigraphy study.

OBJECTIVE To evaluate the skeletal effects of nonsurgical rapid maxillary expansion (RME) on craniofacial structures with bone scintigraphy in young adult female subjects. MATERIALS AND METHODS The material of the present study consists of scintigraphic records taken from 17 early adult females treated with RME. All patients had a bilateral posterior crossbite, transverse maxillary deficiency, deep palatal vault, and dental crowding at the beginning of the treatment. The age range of the patients was 16.1 to 18.8 years, and the mean age was 17.3 +/- 0.86 years. Bone scintigraphy records were obtained before RME (T1), during the splitting of the midpalatal suture (T2), and after the end of active widening period (T3). Repeated measure analysis of variance was used to assess the differences between the periods. In addition, Bonferroni multiple comparison tests were applied to the measurements at which F values were found to be statistically significant. RESULTS According to the statistical analysis, significant activity changes were found in all regions studied and in all slices. The metabolic activity in all regions showed significant increases up to the separation of the midpalatal suture (T1-T2), whereas the metabolic activity exhibited a remarkable decrease (T2-T3) after the opening of the midpalatal suture. CONCLUSIONS Scintigraphic records revealed an increase in the regions of interest scores during RME in all regions and all slices. Therefore, it can be speculated that RME has had not only dental effects but also skeletal effects on young adult patients.

Effects of rapid maxillary expansion with a memory palatal split screw on the morphology of the maxillary dental arch and nasal airway resistance

The purpose of this study was to investigate the effects of rapid maxillary expansion (RME) with a memory palatal split screw on the morphology of the maxillary dental arch and nasal airway resistance (NAR). The material consisted of the rhinomanometric records and study models of 15 patients (8 females and 7 males) with mean age of 12.89 ± 1.20 years. Data were collected before expansion (T1), immediately after expansion (T2), and after a retention period of 6 months (T3). Maxillary expansion was completed within 8 days in all subjects. The data were analysed by analysis of variance. The least significant difference test was also used to determine between which periods the changes in the measurements were significant. Statistical analyses showed that NAR decreased (P < 0.01) and intermolar and interpremolar distances increased (P < 0.001) significantly at all observation periods, except between T2 and T3. RME using a memory palatal split screw is effective for improvement of nasal respiration via a widening effect on the nasal cavity.

Effects of face mask treatment with and without rapid maxillary expansion in young adult subjects

OBJECTIVES To investigate the skeletal, dental, and soft tissue effects of the face mask (FM) treatment with and without rapid maxillary expansion (RME) in young adult subjects with maxillary retrognathia. MATERIALS AND METHODS Pretreatment and posttreatment cephalometric radiographs from 32 subjects who had a skeletal Class III malocclusion were analyzed. The subjects were divided into two groups: FM group (N  =  17; 3 male and 14 female subjects; mean [SD] age 14.47 [0.89] years) was treated with FM only, while the RME+FM group (N  =  15; 3 male and 12 female subjects; mean [SD] age 14.67 [1.28] years) was treated with both FM and RME. Ten cephalometric linear and nine angular variables were measured to assess dentofacial changes. Within-group and between-group comparisons were determined by a paired t-test and Students t-test, respectively. RESULTS Forward displacement of the maxilla and a clockwise rotation of the mandible occurred in both groups. The maxillary-mandibular relationship improved and soft tissue changes resulted in a more convex profile. The maxillary incisors were more proclined in the FM group than in the RME+FM group, the only difference between the two groups. Notably, the mandibular incisors moved backward in both groups. CONCLUSIONS Forward movement of the maxilla can be obtained in young adults after face mask treatment. However, there was no difference in this phenomenon between the FM and RME+FM groups.

Cervical Headgear Effects on the Morphology of the Cervical Vertebrae and Cervical Posture

OBJECTIVE To test the hypothesis that use of cervical headgear has an important effect on the morphology of the cervical vertebrae and cervical posture. MATERIALS AND METHODS The material consisted of pretreatment and posttreatment lateral cephalograms and initial hand-wrist films of 30 subjects who were receiving cervical headgear therapy. Preobservation and postobservation control cephalograms and preobservation hand-wrist films of 15 untreated subjects served as controls. The average treatment time for the treatment group was 9.06 +/- 1.02 months, and the average observation period for the control group was 10.0 +/- 1.1 months. A paired t-test was applied to compare the changes occurring during the examination and observation periods in both groups. In addition, Students t-test was performed to assess the differences between the groups. RESULTS The results of the paired t-test showed that within each group there were statistically significant differences in the majority of measurements concerning the morphology of the cervical vertebrae, whereas the measurements concerning cervical posture showed no significant changes in either group. According to the results of the Students t-test, however, no statistically significant changes between the treatment and control group were present except with regard to two measurements. CONCLUSIONS Changes in the cervicovertebral morphology in the treatment group were achieved more by growth than by cervical headgear treatment. Although high individual variations were found in postural variables, cervical posture did not change over a period of 9 months either in the treatment group or in the control group.

Palatinale gömülü maksiller kanin dişlerin sabit ve hareketli apareyler ile sürdürülmesi: olgu sunumu

Ust cene on bolge dislerinin surme bozukluklari, yuz estetigini olumsuz yonde etkileyen bir klinik problemdir. Gomulu dislerin ark icindeki ideal yerlerine ortodontik olarak surdurulmesi ve dizilmesi hastaya daha iyi bir gulumseme saglamaktadir. Bu amac dogrultusunda, klinisyenin en iyi ortodontik mekanigi secmesi gerekmektedir. Bu calismada palatinale gomulu maksiller kaninlerin surdurulmesi amaciyla kullanilan ortodontik ve cerrahi tedavi secenekleri anlatilmis ve palatinal pozisyonda gomulu maksiller kanin dislerinin sabit ve hareketli ortodontik aygitlarla surduruldugu iki olgu ve bu mekaniklerin avantaj ve dezavantajlari sunulmustur. Sunulan ikinci olguda retansiyon kroseleri ve helikal springleri olan basit ve etkili muteharrik aparey ile gomulu dislerin surduruldugu yeni bir yontem anlatilmistir. Anahtar kelimeler: Palatinale gomulu maksiller kaninler, ortodontik surdurme, sabit ortodontik mekanikler, hareketli ortodontik apareyler, avantaj ve dezavantaj. Abstract Eruption anomalies of maxillary anterior teeth are clinical problem which effects facial esthetics. Forced eruption and alignment of impacted teeth into the arch is the best treatment approach and supply a more estetic smile for patient. For this purpose, clinician should be selecting the best ideal orthodontic mechanics. In this study presented that orthodontics and surgery treatment options was evaluated used for forced eruption of palatally impacted maxillary canines and on two cases that is forced eruption of palatally impacted maxillary canines used with fixed and removable orthodontics mechanics and explain that advantages and disadvantages of this mechanics. In the present two case explained new method that is an effective and simple removable appliance for the forced eruption of impacted teeth which included retention clasps and a helical spring. Key words: Palatally impacted maxillary canines, forced eruption, fixed orthodontic mechanics, removable orthodontic appliance, advantage and disadvantages