Treatment Effects of the MARA and CombiHeadgear Appliances on Patients with Class II Malocclusions PDF Download
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Author: Marcelo Kegler
Publisher:
ISBN:
Category : Malocclusion
Languages : en
Pages : 36
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Book Description
The purpose of the present study was to evaluate cepalometrically the overall changes produced by these treatment modalities (MARA and CombiHeadgear) and compare their treatment effects to each other and to an untreated class II control group.
Author: Marcelo Kegler
Publisher:
ISBN:
Category : Malocclusion
Languages : en
Pages : 36
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Book Description
The purpose of the present study was to evaluate cepalometrically the overall changes produced by these treatment modalities (MARA and CombiHeadgear) and compare their treatment effects to each other and to an untreated class II control group.
Author: Eva-Maria Moll
Publisher:
ISBN:
Category :
Languages : en
Pages : 69
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Book Description
AbstractIntroduction: Class II malocclusions represent one of the most prevalent forms of malocclusion encountered in routine orthodontic practice. In order to correct a Class II malocclusion, miscellaneous orthopedic functional appliances with a broad spectrum of diverse appliance designs have been continuously developed. While the Twin Block is known as one of the best researched functional appliances, only few studies have evaluated the treatment efficacy of the Mandibular Anterior Repositioning Appliance (MARA) since its development in 1991. Thus, the purpose of this retrospective study was to evaluate and compare the skeletal and dentoalveolar effects of the Twin-block and the Mandibular Anterior Repositioning Appliance (MARA) in the treatment of adolescent patients with Class II malocclusions compared to controls. Materials and Methods: The present retrospective study was carried out on three samples: a Twin Block sample, a MARA sample, and a control sample.^The study was based on the evaluation of the lateral cephalometric radiographs of a total of 96 cases at T1 (pre-functional treatment), as well as at T2 (post-functional treatment/ equivalent timeframe in controls). The Twin Block sample with 37 cases represented the largest sample, consisting of 24 females and 13 males. It was treated by the inventor Dr. Clark in his private practice in Fife, Scotland, UK. The average age for the Twin Block group at T1 is 11 years of age. The MARA group consisted of a total of 34 cases: 16 females and 18 males. The average age of the MARA sample at T1 was consistent with the Twin Block sample (11 years of age). The MARA sample was respectively treated by its inventor Dr. Toll, Bad Soden, Germany. The control group was based on 25 cases (12 female and 13 male) obtained from the Michigan growth study. The untreated control group was matched to the MARA sample.^Lateral cephalometric radiographs were taken at the beginning of treatment (T1) and post-functional treatment (T2). Cephalometric changes were evaluated using the Clark analysis including 27 measurements. The MARA, and the control sample were evaluated by an independent commercial company, Rocky Mountain Data Systems, using Joe Ceph by Rocky Mountain Orthodontics. The Twin-Block sample was analyzed by Dr. Clark using Quick CephTM. Results: The results showed that sagittal correction of Class II appeared to be mainly achieved by dental changes, being accompanied by skeletal adaptation. A positive influence of the position of point Pogonion could be achieved in both groups resulting in a considerable decrease of the facial convexity. Skeletal alterations that contributed to skeletal adapations mainly took place in the mandibular ramus, while these changes were significant different form the controls.^No significant alteration of the mandibular plane angle could be determined in all three groups. The current study showed a lower incisors flaring of 5. 47 degree with the MARA appliance and 2. 11 degree with the Twin Block. The effects on the upper incisors varied between the two functional appliances. Slight protrusion of the upper incisors took place with the MARA (+5. 06 degree) and a significant retroclination occurred with the Twin Block ( -12. 42 degree). Accordingly, the interincisal angle decreased in the Twin Block sample and increased on the other hand with the MARA. No significant change of the incisor position of the controls was present. Incisor overjet decreased of about 7. 03 mm in the Twin Block group and 2. 46 mm in the MARA sample. Incisor overbite decreased about 1. 34 mm with the Twin Block and 2. 92 mm with the MARA. Molar relation was corrected in both functional groups resulting in a Class I relation, while no change appeared in the control sample.^While a slight distalizing effect on the upper first molars could be seen in the Twin Block sample ( -0. 06 mm), no such effect could be determined for the MARA appliance (+0. 96 mm). Conclusion: Both appliances resulted in a Class I relationship. Skeletal changes were very similar in both appliances. Overall the Twin Block seemed to be slightly superior to the MARA appliance. Key words: Fixed functional appliance; Twin Block; MARA; Class II malocclusion; Clark analysis.
Author: David C. Freeman
Publisher:
ISBN:
Category : Malocclusion
Languages : en
Pages : 174
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Author: Matthew W. Kotyk
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
The purpose of this study was to retrospectively assess the long term dental and skeletal treatment and growth changes in growing patients with Class II malocclusions treated with the van Beek Headgear Activator (vBHGA) appliance followed by comprehensive fixed orthodontic appliance treatment. A retrospective chart review was undertaken on 40 consecutively treated subjects who were then compared to matched growing untreated control subjects from the Burlington Growth Study and growth forecast simulations. Lateral cephalometric radiographs were used to determine dental, skeletal and growth changes between each treatment phase. Phase 1 vBHGA appliance treatment produced skeletal and dental Class II correction via restraint of maxillary anterior growth, increased mandibular anterior growth, counter clockwise palatal plane rotation, retroclination and retraction of the upper incisors, and proclination and protrusion of the lower incisors resulting in reduced overjet and overbite. The favourable skeletal and dental changes from vBHGA treatment were maintained after the completion of the second treatment phase. The vBHGA appliance was effective in correcting Class II malocclusions by producing favourable skeletal and dental treatment effects in both jaws that were maintained after the completion of phase 2 treatment, in stark contrast to published randomized clinical trials. Success with the vBHGA and potentially other growth modification appliances could be related to patient compliance, timing of the individual's growth spurt, length of phase 1 treatment, and continued orthopedic retention between the first and second phases of treatment.
Author: Rano Burton
Publisher:
ISBN:
Category : Malocclusion
Languages : en
Pages : 120
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Author: Tiffany Rachelle McClaran
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Abdulfatah Hanoun
Publisher:
ISBN:
Category :
Languages : en
Pages : 91
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Book Description
Introduction: Class II malocclusions are of interest to the practicing orthodontists because they constitute a significant percentage of the cases they treat. Over the years, a substantial number of approaches and appliances had been developed for Class II malocclusion treatment. The concept of fixed functional appliance such as Forsus appliance was suggested as an option to overcome the lack of compliance with some patients. Many studies were published about Twin Block but only few studies have evaluated the treatment effects of the Forsus Appliance. Objectives: This study will evaluate the effects of the Forsus appliance in comparison with Twin Block appliance and a non-treated control group for the treatment of Class II malocclusion. Methods: The present retrospective study was carried out on three groups: Twin Block group (37 subjects, mean age 11. 2 Y), Forsus group (30 subjects, mean age 12. 9 Y), and a non-treated control group (25 subjects, mean age 12. 6 Y). The study was based on the evaluation of the lateral cephalometric radiographs of pre-treatment, as well as at T2 (posts appliance removal/ equivalent timeframe in controls. Cephalometric changes were evaluated using the Clark analysis including 27 measurements. Results: The results showed that sagittal correction of Class II appeared to be mainly achieved by dentoalveolar change changes only in Forsus group. The Twin Block appliance therapy was able to induce both skeletal and dentoalveolar changes. A favourable influence on the facial convexity could be achieved in both groups. In the Twin Block group, skeletal alterations that contributed to skeletal correction mainly took place in the mandibular ramus, while these changes were significant different form the controls. The effects on the upper incisors varied between the two functional appliances. Large significant upper incisors retroclination occurred with the Twin Block ( -12. 42 degree) while - 4℗ʻ only observed in Forsus group. The lower incisors were proclined slightly more in Forsus than Twin Block group. No significant change of the incisor position of the controls was present. Incisor overjet reduction was larger in amount in Twin Block (7. 03 mm) and 4 mm in the Forsus group. The overjet correction was about 60% of the initial overjet in both experimental groups. Molar relation was corrected in both functional groups resulting in a Class I relation, while no change appeared in the control sample.
Author: Jeryl D. English
Publisher: Elsevier Health Sciences
ISBN: 0323186971
Category : Medical
Languages : en
Pages : 368
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Book Description
With a concise, focused review of orthodontic concepts and current clinical information, including diagnosis, treatment planning, and clinical treatment, MOSBY'S ORTHODONTIC REVIEW is the resource you need to achieve the best results for success on competency examinations as well as excellent clinical outcomes. From foundational concepts to more subjective areas of treatment planning and clinical treatment, this book includes a wealth of information from distinguished educators, recent graduates, and practicing professionals to help you prepare for the NBDE, Part II and the ABO written and clinical examinations. This title includes additional digital media when purchased in print format. For this digital book edition, media content is not included. Content is designed to prepare you for the NBDE, Part II and the ABO written and clinical examinations to help you achieve the best results. Detailed illustrations provide a visual guide to conditions, techniques, diagnoses, key concepts, and more with case study photos that detail treatment from a patient’s initial exam to completion. Proven question and answer format covers the key information for each topic and helps prepare you for certification exams.
Author: Michael L. Gorlovsky
Publisher:
ISBN:
Category : Jaws
Languages : en
Pages : 96
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Book Description
Background and significance . Class II malocclusion is observed in 15% of the population. Adolescent patients with mandibular deficiency can be treated with functional appliances, like the mandibular anterior repositioning appliance (MARA) or the Twin-Block appliance (TB). Clinically, the TB appliance seems to facilitate better vertical development than the MARA because it allows for molar eruption. Purpose . To compare vertical development between patients treated with MARA or TB appliance. Methods . Records of patients treated with MARA (n=25) and those treated with TB (n=28) obtained from a private practice. Cephalometric X-rays were analyzed at (T1) and at (T2). Results from the two groups were compared using independent groups t-test. Results . Treatment with MARA resulted in less vertical development. Conclusion . Patients with a deep bite should be treated using a Twin-Block appliance to allow for molar eruption. Patients with a normal or open bite should be treated using a MARA to limit further vertical development.
Author: Babak Yousefi
Publisher:
ISBN:
Category :
Languages : en
Pages : 59
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Book Description
The effect of the Bimler appliance on the treatment of Class II division I malocclusion is largely unknown, as few if any, independent studies have evaluated the effect of this specific appliance on Class II division I patients. The objective of the present study was to determine the clinical, and skeletal effects of the Bimler functional appliance when it is used to treat Class II division I malocclusions. The data for the present study were obtained from the records of patients treated by Dr Bimler in his private practice which is located in Wiesbaden in Germany. All of the class II division I cases used in the present study were selected randomly from the records compiled by Dr Bimler himself. The Cases were selected until a sufficient number (n=30) of records were collected. The records were selected to represent both sexes (14 males, and 16 females). Cephalometric measurements were made on radiographs taken at the commencement of treatment (T1) and as well as at the completion of treatment (T2). Nine linear and seven angular measurements were evaluated in this study. The average age of all of the patients was nine years and eight months, with the males being approximately two and one half months older than females when treatment was started. Treatment duration was approximately two and one half years for all of patients with the treatment for the male's lasting several weeks longer than the treatment for the females. This difference was not statistically significant (P=0.05). Each mean change was tested using a paired Student's t-test where the null hypothesis was that no change took place in each parameter from T1 to T2. In addition a test was done to determine if the amount of change that occurred was statistically different between the males and the females. Statistically significant changes associated with the Bimler treatment were observed for ten of the 16 measurements recorded. These measurements included the angle ANB, U1-L1 and U1-SN, the linear measurements Co-A, Co-Gn, Ar-Gn, ANS-Me, Wits, L1-Apo and Overjet. In no determination was there a statistically significant difference (ps0.05) between the males and the females. In this study it was concluded that: The clinical overjet was decreased by the increased forward growth of the mandible and by dentoalveolar changes. The Bimler appliance appears to have mainly skeletal effects with a few smaller, but significant, dentoalveolar effects. The appliance had little or no effect on the maxillary skeletal structures.
