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Journal articles on the topic 'Retromolar space, lateral cephalogram'
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Jakovljevic, Aleksandar, Emira Lazic, Ivan Soldatovic, Nenad Nedeljkovic, and Miroslav Andric. "Radiographic assessment of lower third molar eruption in different anteroposterior skeletal patterns and age-related groups." Angle Orthodontist 85, no. 4 (September 22, 2014): 577–84. http://dx.doi.org/10.2319/062714-463.1.
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ABSTRACT Objective: To analyze radiographic predictors for lower third molar eruption among subjects with different anteroposterior skeletal relations and of different age groups. Materials and Methods: In total, 300 lower third molars were recorded on diagnostic digital orthopantomograms (DPTs) and lateral cephalograms (LCs). The radiographs were grouped according to sagittal intermaxillary angle (ANB), subject age, and level of lower third molar eruption. The DPT was used to analyze retromolar space, mesiodistal crown width, space/width ratio, third and second molar angulation (α, γ), third molar inclination (β), and gonion angle. The LC was used to determine ANB, angles of maxillar and mandibular prognathism (SNA, SNB), mandibular plane angle (SN/MP), and mandibular lengths. A logistic regression model was created using the statistically significant predictors. Results: The logistic regression analysis revealed a statistically significant impact of β angle and distance between gonion and gnathion (Go-Gn) on the level of lower third molar eruption (P < .001 and P < .015, respectively). The retromolar space was significantly increased in the adult subgroup for all skeletal classes. The lower third molar impaction rate was significantly higher in the adult subgroup with the Class II (62.3%) compared with Class III subjects (31.7%; P < .013). Conclusion: The most favorable values of linear and angular predictors of mandibular third molar eruption were measured in Class III subjects. For valid estimation of mandibular third molar eruption, certain linear and angular measures (β angle, Go-Gn), as well as the size of the retromolar space, need to be considered.
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Bronoosh, Pegah, and Leila Khojastepour. "Analysis of Pharyngeal Airway Using Lateral Cephalogram vs CBCT Images: A Cross-sectional Retrospective Study." Open Dentistry Journal 9, no. 1 (July 31, 2015): 263–66. http://dx.doi.org/10.2174/1874210601509010263.
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Background : As the basic biological relationship of form and function, changes in the normal pattern of nasopharyngeal space can profoundly affect the development of the craniofacial growth. The lateral cephalogram, part of the patient’s normal records for orthodontic treatment, may show some of these changes either at the initial examination or later during treatment. The validity of the information the lateral cephalogram may present, have been questioned previously. The aim of this study was to assess correlation between the area and the volume measurements of pharyngeal airway size in a lateral cephalogram and a 3-dimensional (3D) cone-beam computed tomography (CBCT) scan in adolescent subjects. Materials and Methods : CBCT scan and a lateral cephalogram of 35 subjects which were taken within 1 week were included in this study. Airway area of the region of interest from the lateral cephalogram and airway volume over the same of region of interest from the CBCT scan were assessed for all patients. The correlation between the area and the volume measurements were evaluated statistically by Pearson’s correlation coefficient test. Mann Whitney U Test was used for comparing the area and the volume measurements in different sex. Results : Strong correlation was found between lateral cephalogram and CBCT measurements of pharyngeal airway. (r=0.831). Conclusion : Pharyngeal airway area on a lateral cephalogram is correlated strongly with volumetric data on CBCT images. Henceforth the use of CBCT images for volume measurements in orthodontic patients can aid in the better evaluation of airways and acted as a diagnostic instrument in this area.
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Balashova, M. E., Z. S. Khabadze, I. A. Voronov, I. N. Bagdasarova, and N. N. Fedotova. "Reliability of lateral cephalometric radiographs in the assessment of the upper airway: a systematic review." Endodontics Today 19, no. 2 (July 13, 2021): 126–31. http://dx.doi.org/10.36377/1683-2981-2021-19-2-126-131.
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Relevance. The problem of respiratory diseases has been studied for a long time by many specialists and remains relevant to this day. This problem has been of interest to researchers for many years due to several factors. In many studies, it was demonstrated, that a signifcant relationship exist between the upper airway condition and jaw growth, craniofacial skeleton and TMJ dysfunction. Lateral cephalometric radiographs (LCRs) have been used to assess skull parameters, jaw bones and teeth, the morphology of the upper airway, the severity of airways obstruction and adenoid size. The present study aimed to determine the reliability of LCRs compared to CBCT in the assessment of the upper respiratory tract in order to determine which variables are reliable for potential use in clinical diagnosis.Aim. To analyze the literature on the effectiveness of the using Lateral Cephalogram in the assessment of the upper airway.Materials and methods. Electronic search of articles was carried out using search engines and databases: Cyberleninka, eLIBRARY, Google Scholar, Pub Med, SCOPUS. The publication date criterion was selected from January 2010 to January 2021. The electronic search was conducted using the following keywords: lateral cephalogram, upper airway, cone-beam computed tomography. A total of 10 studies from the literature met the selection criteria.Results. CBCT provides a good estimate of the transverse dimensions and volumetric measurement of the airway space. Linear measurements of CBCT and LCRs were quite reliable and reproducible. The most diffcult to study and differentiate area is the oropharynx, the variability of the pharyngeal segment cannot be predicted by LCs. LCRs method is advisable for adenoid pathology diagnosis due to its fnancial acceptability and availability. The cephalometric headflm provides a good general overall indicator for nasopharyngeal airway patency, adenoidal hypertrophy.Conclusions. The traditional lateral cephalogram remains not only a standard, reproducible and cost-effective diagnostic method in orthodontics, but also a reliable initial tool for screening upper airway obstruction, studying the nasopharyngeal morphology and assessment of adenoid size. Based on our results, the measurement of the nasopharyngeal space on lateral cephalograms can be used as an initial screening method to estimate the nasopharynx volumes. The results demonstrate that a lateral cephalogram can provide valuable information about the severe limitations and nasopharyngeal morphology
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Rai, S., M. Kaur, and S. Kaur. "Comparison of reliability of lateral cephalogram and computed tomography for assessment of airway space." Nigerian Journal of Clinical Practice 17, no. 5 (2014): 629. http://dx.doi.org/10.4103/1119-3077.141431.
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KavithaGiri, NanithaLakshmi, MSudhaa Mani, SYasmeen Ahamed, and G. Sivaraman. "Evaluation of central obesity, increased body mass index, and its relation to oropharyngeal airway space using lateral cephalogram in risk prediction of obstructive sleep apnea." Journal of Pharmacy And Bioallied Sciences 13, no. 5 (2021): 549. http://dx.doi.org/10.4103/jpbs.jpbs_566_20.
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AlSaty, Ghaddy, Mary Burns, and Peter Ngan. "Effects of maxillomandibular advancement surgery on a skeletal Class III patient with obstructive sleep apnea: A case report." APOS Trends in Orthodontics 11 (July 9, 2021): 161–68. http://dx.doi.org/10.25259/apos_191_2020.
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This case report describes the successful surgical treatment of a patient diagnosed with obstructive sleep apnea (OSA). A 55-year-old Caucasian male patient with a body mass index (BMI) of 25.6 kg/m2 sought treatment with a chief concern of excessive daytime sleepiness and fatigue. An initial polysomnography report showed moderate OSA with an apnea-hypopnea index (AHI) of 21.2 events/h, and Epworth Sleepiness Score (ESS) of 12/24. The patient was initially prescribed with CPAP treatment but was unable to tolerate treatment after a few months. Clinical and radiographic examination revealed a concave facial profile with maxillary retrognathism. Intraoral examination revealed generalized gingival recession, missing upper lateral incisors and lower first premolars, anterior crossbite, and maxillary transverse deficiency with bilateral posterior crossbite. The lateral cephalogram showed a narrow posterior airway space at the level of the base of the tongue. The patient was treated with maxillomandibular advancement (MMA) surgery to improve airway obstruction. Results showed balanced facial esthetic and stable occlusion with a complete resolution of the patient’s OSA and a post-operative improvement of AHI from 21.2 to 0.7 events/h and ESS from 12/24 to 3/24. The lowest oxyhemoglobin saturation during sleep was improved to 97%, and the BMI decreased from 25.6 to 25.2 kg/m2. These results suggest that MMA surgical procedure can be used as a definitive treatment for patients with maxillomandibular deficiency and OSA.
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Rai, Shalu, Sandeep Kaur, Abhishek Sinha, Vikas Ranjan, Deepankar Mishra, and Sapna Panjwani. "A lateral cephalogram study for evaluation of pharyngeal airway space and its relation to neck circumference and body mass index to determine predictors of obstructive sleep apnea." Journal of Indian Academy of Oral Medicine and Radiology 27, no. 1 (2015): 2. http://dx.doi.org/10.4103/0972-1363.167062.
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Sapkota, Manish Raj, Shishir Bhatta, Sujita Shrestha, and Rabindra Man Shrestha. "Position of Impacted Mandibular Third Molar in different Skeletal Facial Types." Orthodontic Journal of Nepal 7, no. 2 (June 8, 2018): 15–19. http://dx.doi.org/10.3126/ojn.v7i2.20154.
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Introduction: Variation in growth pattern in different facial forms affect the space available for tooth eruption, therefore the mandibular third molar impaction has correlation with different skeletal facial types.Objective: To determine the position of impacted mandibular third molar in different skeletal facial types in Nepalese samples.Materials & Method: This cross sectional study was carried out on pre-treatment lateral cephalogram and orthopantomogram records of 207 orthodontic patients visiting Kantipur Dental College and Hospital. Age range of the sample was 16-33 years. Various facial forms were determined with the help of mandibular plane angle (SN-GoGn); for which Nemoceph software was used. Beta angle was used to determine the angle of impaction of mandibular third molar. Impaction pattern was classified as per Pell & Gregory and Winter’s system. SPSS version 20 was used for statistical analysis.Result: Overall rate of mandibular third molar impaction was 63.77% (11.11% unilateral and 52.66% bilateral impaction). The most common type of impaction bilaterally was mesioangular based on Winter’s classification, Class II Position B based on Pell & Gregory’s classification. Higher rate of mandibular third molar impaction was found in dolichofacial type of face (49.2%).Conclusion: Decreased mandibular third molar impactions are seen in brachyfacial type compared to mesofacial and dolichofacial types
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Viqar, Sana, Sadia Rizwan, Syed Shah Faisal, and Syed Sheeraz Hussain. "The Frequency of Mandibular Third Molar Impaction in Different Types of Vertical Skeletal Faces." Journal of the Pakistan Dental Association 30, no. 02 (May 29, 2021): 118–23. http://dx.doi.org/10.25301/jpda.302.118.
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OBJECTIVE: To determine the frequency of mandibular third molar impaction in different vertical skeletal facial types. METHODOLOGY: Data was collected using pre-treatment records including orthodontic files, pre-treatment lateral cephalograms and OPGs of 90 orthodontic patients. Patients from both genders were included. The age group of selected patients was 18-30 years. Vertical skeletal malocclusion was measured using facial angle and mandibular plane angle on cephalogram to group the subjects into Mesiofacial, Brachyfacial and Dolichofacial patients. Third molar eruption status was assessed using OPG. RESULTS: Results showed that erupted third molars were mostly found in brachyfacial patients. Among 32 erupted mandibular third molars, 16 belong to brachyfacial, 11 belonged to mesiofacial and 5 belonged to dolichofacial group. Complete impaction of mandibular third molar was most common among dolichofacial patients. Among 29 completely impacted mandibular third molars, 14 belong to dolichofacial, 9 belonged to mesiofacial and 6 belonged to brachyfacial group. No significant difference was found for partially impacted third molars among the three groups of facial types. There was higher prevalence of mandibular third molar impaction in females as compared to males. CONCLUSION: Frequency of third molar impaction was found to be highest in dolichofacial patients and lowest in brachyfacial patients due to forward direction of mandibular growth contributing to greater resorption of the anterior border of ramus and the additional space required for third molar eruption.
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Tassoker, Melek, Hatice Kok, and Sevgi Sener. "Is There a Possible Association between Skeletal Face Types and Third Molar Impaction? A Retrospective Radiographic Study." Medical Principles and Practice 28, no. 1 (October 31, 2018): 70–74. http://dx.doi.org/10.1159/000495005.
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Objective: Third molar impaction is seen much more than impaction of any other tooth as they are the last teeth to erupt. Inadequate retromolar space and the direction of eruption may be contributing factors. The aim of this study was to investigate the relationship between third molar impaction and different skeletal face types. Subjects and Methods: Panoramic and lateral cephalometric radiographs of 158 orthodontic patients (aged 19–25 years) were retrieved from the archived records of the Necmettin Erbakan University Faculty of Dentistry, Konya, Turkey. Third molar impaction was classified on the basis of Winter’s classification. The skeletal facial type was determined by a measure of the angle created by the lines Ba-Na and Pt-Gn. The mean was 90 ± 2 and this value was regarded as mesofacial. An angle of > 93° was regarded as brachyfacial and an angle of < 87° as dolichofacial. Results: The overall presence of mandibular and maxillary third molar impactions was 65.2 and 38.6%, respectively. Although there was a statistically significant difference between different skeletal facial types and mandibular third molar impaction (p < 0.05), no statistically significant differences were observed between different skeletal facial types and maxillary third molar impaction (p > 0.05). Brachyfacials demonstrated a lower prevalence of third molar impaction than dolichofacials. Conclusions: Different skeletal face types were associated with mandibular third molar impaction. Brachyfacials, who have a greater horizontal facial growth pattern than dolichofacials, showed a lower prevalence of impacted mandibular third molars.
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Hartati, Sri, Heryumani JCP, and Kuswahyuning Kuswahyuning. "Perubahan Posisi Mandibula pada Perawatan Kamuflase Maloklusi Kelas III Skeletal." Majalah Kedokteran Gigi Indonesia 20, no. 2 (December 1, 2013): 140. http://dx.doi.org/10.22146/majkedgiind.7675.
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Maloklusi kelas III skeletal pada umumnya memiliki hubungan rahang yang prognatik, yaitu mandibula terletak lebih maju dari maksila. Perawatan kamuflase non pembedahan pada pasien dewasa dengan maloklusi kelas III memerlukan pencabutan dua gigi premolar mandibula atau empat gigi premolar untuk memberikan ruang retraksi gigi incisivus mandibula. Prinsip perawatan teknik Begg adalah mekanisme gaya differensial dengan menggunakan gaya yang ringan dan kontinyu. Penggunaan elastik intermaksiler kelas III menyebabkan ekstrusi gigi molar atas, retrusi gigi insisivus bawah, rotasi mandibula searah jarum jam dan perubahan posisi kondilus. Penelitian ini bertujuan untuk mengetahui perubahan linier dan anguler posisi mandibula pada perawatan kamuflase maloklusi kelas III skeletal setelah dilakukan perawatan ortodontik dengan teknik Begg. Penelitian dilakukan pada 20 pasang sefalogram lateral dari subjek laki-laki dan perempuan usia 18-25 tahun yang memenuhi kriteria penelitian. Seluruh subjek yang dirawat dengan teknik Begg disertai pencabutan dua gigi premolar pertama bawah. Perubahan posisi mandibula ditentukan dengan perubahan titik Pg dan Pg. terhadap sumbu X dan sumbu Y sedangkan perubahan anguler dengan melihat perubahan sudut Y-axis. Data yang diperoleh dianalisisi dengan paired t test. Hasil penelitian perubahan posisi mandibula setelah perawatan ortodontik kamuflase dengan alat cekat teknik Begg menunjukkan perubahan yang bermakna (p<0,05). Titik Pg mengalami pergeseran ke arah posterior dan inferior dan sudut Y-axis mengalami peningkatan berarti terjadi rotasi searah jarum jam.Skeletal Class III malocclusion generally has prognatic jaw relationship. The mandibular is more forward than the maxilla. Camouflage non-surgical treatment in adult patients with Class III malocclusion required extraction of two mandibular premolars or four premolar teeth to give a space of mandibular incisors teeth retraction. The Begg technique treatment principle is the mechanism of differential force using light and continuous force. The use of inter-maxillary elastic Class III causes the extrusion of upper molars, retrusion of lower incisors, clockwise rotation of the mandible and changing of condyle position. This research aims to determine the linear changing and angular position of the mandible on the camouflage treatment of skeletal Class III malocclusion after orthodontic treatment with Begg technique. The research was conducted on 20 pairs of lateral cephalogram of men and women aged 18-25 years who met the research criteria. All subjects were treated with Begg technique with extraction of two lower first premolars. The changing of mandibular position is determined by changing the point Pg and Pg. to X axis and Y axis, while the angular changing is determined by looking at the changing of Y-axis. The obtained data were analysed with paired t test analysis. The results show that there are significant changes in mandibular position after camouflage orthodontic treatment with fixed appliance of Begg technique (p<0,05). Pg point is shifted towards the posterior and inferior, and Y-axis angle increases. It means that the clockwise rotation has happened.
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Urbaniak-Malinowska, Gabriela, Marta Gibas-Stanek, Stephen Williams, and Bartłomiej Loster. "Dental and skeletal changes after intra-oral molar distalization using a “Distal Driver” appliance: a pilot study." Journal of Stomatology 69, no. 6 (December 31, 2016): 695–711. http://dx.doi.org/10.5604/00114553.1230590.
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Introduction. Loss of space in the maxillary arch is a frequent consequence of early loss of deciduous molars indicating distalisation of the mesialised molar tooth. A number of methods using either extra-oral appliances or intra oral appliances of various types have been suggested. While extra-oral appliances exert a high but intermittent force many of the intraoral ones deliver a modest, though constant, force and demands no patient cooperation. Aim of study. To investigate the effect of an intra-oral fixed appliance (Distal Driver) based on a NiTi spring incorporating also a standardised anchorage unit on the position of the maxillary first molar as well as on the facial skeleton and the dentition in general. Material and methods. The experimental group comprised 6 child patients exhibiting a distal molar relationship (Unilateral or Bilateral) of at least ½ premolar unit. The mesialised molars were distalised by means of a “Distal driver” exerting a force of 150 gm for a period of 3-4 weeks. Anchorage was created by a fixed modified palatal bar cemented on the premolars supporting an acrylic palatal button ad modum Nance. The clinical situation was recorded before and after molar distalisation by means of study casts, cephalograms, panoramic radiographs as well as intra-oral photographs. The distalisation of the molars as well as the effect on anchorage teeth was quantitated on digital models derived from the plaster casts. Evaluation of the observed distal and vertical changes in molar position was performed on the lateral cephalogram. Results. Cast analysis showed a clear distalising effect on the maxillary first molars ranging from 1.25 mm to 6.18 mm as well as mesial movement of the premolar anchorage teeth from 0.46 mm to 5.55mm. The cephalometric analysis revealed a first molar distalisation of 0.9 mm to 5.6 mm though again with a mesial movement of the first premolar varying from 0.5 mm to 3.7 mm. A clear distal tipping of the first and second molars simultaneously with a mesial tipping of the first premolars was also recorded. Conclusion. The Distal Driver constitutes an efficient method of maxillary molar distalisation though is often accompanied by a distal rotation of these teeth and a mesial tipping of the anchorage premolars. Careful monitoring of anchorage loss is necessary if good results are to be achieved.
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Bikash Maiti, Soumendu. "Cephalometric Interincisal Angle and Mandibular Variations Among Snorers and Non-Snorers Among North India Population: A Cross Sectional Study." Journal of Dentistry and Oral Sciences, October 10, 2020. http://dx.doi.org/10.37191/mapsci-2582-3736-3(1)-065.
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Introduction: Snoring which falls within the spectrum of sleep-related breathing disorders considered to be a common symptom of airway obstruction. Over the years, lateral cephalometric radiography has become one of the standard diagnostic tools to evaluate skeletal and soft tissue abnormalities contributing to obstruction, and have been the most common imaging method in evaluating patients with sleep-disordered breathing (SDB). Aim: To analyze the pharyngeal space in the retroglossal region and the region of hypopharynx at the level of epiglottis as well as its relation with the height and weight of the individuals. Materials And Methods: The study was conducted among 60 participants age 21-50 years and was equally divided into snorers and non-snorers. Lateral cephalogram was taken maintaining the exposure parameters and DIGORA software was used for soft tissue parameters. The parameters analyzed were an interincisal angle, angle of the mandible and height of the ramus. Results: Interincisal angle was found to be more among snorers as compared to non-snorers (p<.05), whereas the angle of the mandible and height of the ramus was found to be less among snorers as compared to non-snorers and was found to be statistically significant.
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Huang, Liping, and Xuemei Gao. "The interaction of obesity and craniofacial deformity in obstructive sleep apnea." Dentomaxillofacial Radiology, November 5, 2020, 20200425. http://dx.doi.org/10.1259/dmfr.20200425.
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Objective: Both obesity and craniofacial deformity are important etiologies of obstructive sleep apnea (OSA). The present research aimed to explore their interaction and different impacts on OSA severity. Methods: A total of 207 consecutive OSA patients (169 males, 38 females) were included in the research. Based on the body mass index (BMI) value, patients were divided into 77 normal-weight patients (BMI <24 kg m−2), 105 overweight patients (24 ≤ BMI<28 kg m−2) and 26 obese patients (BMI ≥28 kg m−2). All accepted overnight polysomnography and standard lateral cephalogram. Cephalometric measurements involved 25 cephalometric variables. The correlations between these cephalometric variables, BMI and the apnea-hypopnea index (AHI) were evaluated. Results: For the whole sample after controlling for gender and age, stepwise regression analysis showed that the factors affecting AHI were increased BMI, narrowing posterior airway space, inferior displacement of hyoid and elongation of the tongue. When grouped by BMI, normal-weight group exhibited with more reduced maxillary length and mandible length, and steeper mandible plane than overweight and obese patients (p < 0.0167). Obese group showed least skeletal restriction and most prominent soft tissues enlargement (p < 0.0167). However, these skeletal indexes were not statistically correlated with AHI. Conclusions: Obesity and skeletal malformations were both etiological factors of OSA, but obesity seemed to have a greater influence on AHI severity in all kinds of obese and thin OSA patients. Only in normal-weight group, it was affected by both cephalometric variables and BMI.
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Mondal, Samit, Kasturi Mukherjee, and Manas Banerjee. "THREE DIMENSIONAL ASSESSMENT OF MOVEMENT OF SKELETALLY ANCHORED MOLARS DURING LEVELING AND ALIGNMENT STAGE OF FIXED ORTHODONTIC MECHANOTHERAPY." INTERNATIONAL JOURNAL OF SCIENTIFIC RESEARCH, May 1, 2021, 50–54. http://dx.doi.org/10.36106/ijsr/1219466.
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Introduction- Alignment and leveling has been dene as “The tooth movement needed to achieve passive engagement of a plain arch wire of 0.019x0.025 dimension having standard arch form in to a correctly placed 0.022˝ bracket system.''Anchorage is an important consideration in the alignment and leveling stage of orthodontic treatment. Loss of anchorage during this stage is to be considered in the three planes of space. Aims and objectives - Three dimensional assessment of the position of skeletally anchored rst molar teeth and three dimensional assessment of the position of rst molar teeth anchored with conventional trans palatal arch using lateral cephalogram and study models, at the end of leveling and alignment stage of xed orthodontic mechanotherapy and its comparison with pretreatment position.Utimately to nd out by comparing the above measurements whether skeletally anchored molars offer more anchorage than molars anchored with conventional transpalatal arches. Materials and methods- These 30 patients were asked to participate in this study out of which 20 consented. All pre-treatment(T ) patient records were made: o study models, standard lateral cephalograms (Satlec – Pano D), extra oral and intra oral photograph. Miniscrew anchored transpalatalarch (MATPA) was placed in 12 patients(group I) and conventional transpalatal arch in 8 patients (group II). 0.022” stainless steel M.B.T. prescription brackets and tubes ( Nu- Edge, TP Orthodontics) were used and treatment mechanics described by Mc. Laughin, Bennet and Trevisi were followed in all patients. Result - This study attempted a 3-dimensional assessment of molar movement during alignment and leveling stage. The mini screw anchored trans palatal arch (MATPA) was found to offered better anchorage than the conventional trans palatal arch (TPA) .In the sagittal plane angular and linear measurements were found to have signicantly changed after leveling and alignment for conventional TPA group whereas no signicant difference were found in MATPA group. In the vertical plane, the perpendicular distance of the mesiobuccal cusp tip to the platal plane was found to be signicantly changed in conventional TPA group whereas no signicant change was measured in MATPA group. ConclusionMiniscrew anchored trans palatal arch offered better anchorage control of maxillary rst molar teeth in sagittal, vertical and transverse plane, during the leveling & alignment stage of xed orthodontic mechanotherapy, when compared with conventional trans palatal arch.