Comparison of facemask therapy effects using skeletal and tooth-borne anchorage:

ABSTRACT Objectives To investigate long-term outcomes of dentoskeletal changes induced by facemask therapy using skeletal anchorage in Class III patients and compare them to those of conventional tooth-borne anchorage. Materials and Methods This retrospective study included 20 patients who received facemask (FM) therapy with miniplates as anchorage for maxillary protraction (Miniplate/FM group, 10.6 ± 1.1 years old [mean ± SD]) and 23 patients who were treated with facemask with rapid maxillary expander (RME/FM group, 10.0 ± 1.5 years old [mean ± SD]). Dentoskeletal changes were evaluated using lateral cephalograms at pretreatment (T1), after facemask therapy (T2), and at the post-pubertal stage (T3). Cephalometric changes were compared between groups and clinical success rates at T3 were evaluated. Results SNA and A to N perpendicular to FH increased significantly more in the Miniplate/FM group than in the RME/FM group when comparing short-term effects of facemask therapy (T1–T2). ANB, Wits appraisal, Angle of convexity, mandibular plane angle, and overjet decreased significantly more in the RME/FM group than in the Miniplate/FM group after facemask therapy (T2–T3). A more favorable intermaxillary relationship was observed in the Miniplate/FM group than in the RME/FM group in long-term observations (T1–T3). Clinical success rate at T3 was 95% in the Miniplate/FM group and 85% in the RME/FM group. Conclusions Facemask therapy with skeletal anchorage showed a greater advancement of the maxilla and more favorable stability for correction of Class III malocclusion in the long-term than conventional facemask therapy with tooth-borne anchorage.

Assessement of the Nasal Shape after Orthognathic Maxillary Surgery

Background : Orthodontic and/or surgical modifications to the jawbone could undoubtedly have aesthetic effects on the shape or position of the nose.Aim : Cephalometric analysis was used to evaluate the aesthetic alterations (dimensional and positional) of the nose in this patients.he PIDAQ was cross-culturally adapted into Malay version by forward- and backward-translation processes, followed by psychometric validation.Methods : To compare cephalometric changes in the nose, a cross-sectional study was conducted from January to March 2019. A sample of 20 orthognathic patients was included in this study. Their mean age was 22.40 (+/-6.98 years). The amplitude of the surgical movements of all patients were measured, using measurements on profile teleradiographs and on photos of faces taken before and after surgery. The statestical analysis of cephalometric data before and after surgery was performed using the Wilcoxon test. The significance level was p≤0.05.Results : The results revealed that a significant reduction in the angular values of SNA (°) (p<0.001), GoGn/SN (°) (p=0.038), Occ/Sn (°) (p=0.007) and AoBo (mm) (p=0.025). No statistically significant differences were noted for specific cephamometric variables before and after surgery. For the comparison of facial photographs, all the values of the specific measurements before and after were significant with the exception of Prn - SN.Conclusion : The width of the base of the nasal wing increased, the displacement and the amount of rotation of the nasal tip also increased in most patients. In contrast, a drop in the X-axis to Prn distance was noted.

Comparison of cephalometric changes resulting from different upper incisor intrusion methods

Aim: The aim of this study was to provide intrusion of upper incisors with applying Connecticut Intrusion Arch (CIA) and Miniscrew and to evaluate the dental and skeletal cephalometric effects of these intrusion methods on individuals with deep bite caused by supraocclusion of upper incisors. Methodology: The study includes 40 adults, without making sexual distinction, who have at least 4 mm deep bite caused by supraocclusion of upper incisors. Two study groups each consisting 20 individuals formed as CIA and Miniscrew groups. Skeletal, dental, soft tissue measurements were done on lateral cephalograms and apical root resorption measurements were done on standard periapical radiographs that were taken from upper four incisor teeth. Statistically, Paired Student’s t-test was used in intragroup comparements and independent Student’s t-test was used in the investigation of differences between groups. Nevertheless, the concern of variables that seen as risk factors with the amount of resorption was investigated with Pearson correlation analysis. Results: Successful intrusion of four upper incisor teeth with CIA and Mini screw methods and in-significant difference was determined between two methods. Protrusion of upper and lower incisor teeth decrease in interincisal angle and overbite and increase in overjet was stated by intrusion at both of the methods. The decline of the mesiobuccal cusp of the upper first molar was observed in the CIA method. In soft tissue evaluation, decrease of upper lip length, upper lip thickness and distance of upper and lower lip to the Rickett’s plane was observed. Conclusion: The methods used for intrusion showed to cause similar ratio of root resorption. How to cite this article: Süer Tümen D, Hamamcı O. Comparison of cephalometric changes resulting from different upper incisor intrusion methods. Int Dent Res 2021;11(Suppl.1):177-94. https://doi.org/10.5577/intdentres.2021.vol11.suppl1.26 Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.

Value of Interceptive Orthodontic Treatment for the Management of Sleep Disordered Breathing: A Prospective Longitudinal Study

Background: The paediatric population has a high incidence of sleepdisordered breathing (SDB). One notable risk factor for SDB is the presence of craniofacial abnormalities. The aim of this study was to evaluate the prevalence of SDB by means of questionnaires in patients who received interceptive treatment, to determine whether there is a relationship between the nature and duration of treatment and the prevalence of SDB, and to correlate cephalometric changes with the type of orthopaedic treatment received and questionnaire results. Materials and Methods: Prospective study of 203 patients who required interceptive treatment. Two sleep questionnaires (the Paediatric Sleep Questionnaire (PSQ) and the Sleep Disturbance Scale for Children (SDSC)) were used which were completed by the parents at baseline (T1) and after completion of interceptive treatment (T2). The results of the questionnaires were analysed, grouped according to the type of treatment received and related to 12 cephalometric variables on cephalometric radiography at T1 and T2. Results: The prevalence of SDB at T1 was 21.2% according to PSQ and 33% according to SDSC. The mean age at T1 was 8.5 years and the mean duration of treatment was 13.8 months. Between 10.8% (PSQ) and 17.2% (SDSC) of patients showed improvement in SDB after interceptive treatment (p<0.05). Treatment led to statistically significant cephalometric changes in the variables of mandibular length, maxillary length and overbite, with no significant differences between treatment groups or in relation to questionnaire results. Conclusion: Interceptive treatment achieves significant improvements in SDB. The type and duration of treatment do not affect the prevalence of SDB, although RPE is associated with a higher rate of improvement. The improvement in SDB is independent from the type of treatment and the cephalometric changes effected.

Prognostic Indicators for Anterior Mandibular Repositioning in Adolescents with Class II Malocclusion: A Cross-Sectional Cephalometric Study

Objective: To investigate the cephalometric changes following anterior repositioning of the mandible for predicting the treatment effects in Class II adolescent patients. Study Design: Lateral cephalograms of 28 patients (ANB &gt; 4°) were taken in centric occlusion (CO) and edge-to-edge bite (EtoE) before orthodontic treatment. The patients were classified into two groups according to their mandibular plane angle [MPA; low MPA (LMPA) ≤ 28° and high MPA (HMPA) &gt; 28°]. Cephalometric changes of hard and soft tissues were measured and analyzed with an x-y cranial base coordinate system. Results: For CO to EtoE, there were no significant cephalometric changes between HMPA and LMPA, but the horizontal ratio of soft to hard tissue pogonion (H-Pog′/H-Pog) change was significantly greater with LMPA than with HMPA while the vertical ratio (V-Pog′/V-Pog) showed vice versa. For CO to EtoE, MPA showed significant correlations with H-Pog′/H-Pog and V-Pog′/V-Pog. Y-axis angle, V-Pog′/V-Pog and H-Pog′/H-Pog can be used as good tools to discriminate between HMPA and LMPA. Conclusion: Cephalometric findings for CO to EtoE may be useful in predicting the vertical and horizontal changes of hard and soft tissues with the treatment of growing adolescents having various vertical skeletal patterns of Class II malocclusion.