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Luciane Macedo De Menezes - One of the best experts on this subject based on the ideXlab platform.
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metal ion quantification in the saliva of patients with Lingual Arch appliances using silver solder laser or tig welding
Clinical Oral Investigations, 2020Co-Authors: Helena Reis Souza Schacher, Luciane Macedo De MenezesAbstract:OBJECTIVES Quantify metal ion release in the saliva, considering that orthodontic appliances with soldered or welded parts may suffer corrosion and release metal ions into saliva, which can trigger adverse effects, such as hypersensitivity. METHODS Sixty-four patients were distributed into four groups: G1 (control), G2 (silver-soldered Lingual Arch), G3 (laser-welded Lingual Arch), and G4 (TIG-welded Lingual Arch). Saliva samples were collected at four different points and were analyzed for ion release with ICP-MS. RESULTS For Cr, Fe, Cu, and Sn ion concentrations among groups, there was no difference along collections and no statistically significant difference throughout collections for any group (P > 0.05, with release values between 3.3 and 4.2 μg/L for Cr, 201 and 314.8 μg/L for Fe, 23.1 and 40.7 μg/L for Cu, and 13 and 27.7 μg/L for Sn). For Ni, G4 showed an increased ion release at T2 (14.3 μg/L) and T4 (34.5 μg/L), values with an interaction effect (P 0.05). For Zn ions, there was a statistic difference from G4 to G1 and G2 (P = 0.007 and P = 0.019), with median values ranging from 741.7 to 963.4 μg/L for G4, and for Ag ions, from G4 to G2 and G3 (P < 0.001 for both), with lower medians for G4 (3.7-6.1 μg/L). For Cd ions there was a statistic difference from T1 to T4 in all groups (P = 0.016), with lower values for T4. CONCLUSIONS Different welding procedures may affect salivary ion concentrations. For most ions there was no significant increase comparing welding and comparing throughout points in the same group. Although TIG welding presented greater Ni ion release, this possibly occurred due to a bigger corrosion of the welded. CLINICAL RELEVANCE Determining the amount of released metal ions from the use of orthodontic appliances is relevant to ensure the safest method for patients. Welding procedures affect salivary ion concentrations, when comparing ion release triggered by one of the most common devices used for preventive/interceptive orthodontic treatments.
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Metal ion quantification in the saliva of patients with Lingual Arch appliances using silver solder, laser, or TIG welding
Clinical Oral Investigations, 2019Co-Authors: Helena Reis Souza Schacher, Luciane Macedo De MenezesAbstract:OBJECTIVES Quantify metal ion release in the saliva, considering that orthodontic appliances with soldered or welded parts may suffer corrosion and release metal ions into saliva, which can trigger adverse effects, such as hypersensitivity. METHODS Sixty-four patients were distributed into four groups: G1 (control), G2 (silver-soldered Lingual Arch), G3 (laser-welded Lingual Arch), and G4 (TIG-welded Lingual Arch). Saliva samples were collected at four different points and were analyzed for ion release with ICP-MS. RESULTS For Cr, Fe, Cu, and Sn ion concentrations among groups, there was no difference along collections and no statistically significant difference throughout collections for any group (P > 0.05, with release values between 3.3 and 4.2 μg/L for Cr, 201 and 314.8 μg/L for Fe, 23.1 and 40.7 μg/L for Cu, and 13 and 27.7 μg/L for Sn). For Ni, G4 showed an increased ion release at T2 (14.3 μg/L) and T4 (34.5 μg/L), values with an interaction effect (P 0.05). For Zn ions, there was a statistic difference from G4 to G1 and G2 (P = 0.007 and P = 0.019), with median values ranging from 741.7 to 963.4 μg/L for G4, and for Ag ions, from G4 to G2 and G3 (P
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Metal ion quantification in the saliva of patients with Lingual Arch appliances using silver solder, laser, or TIG welding
Clinical Oral Investigations, 2019Co-Authors: Helena Reis Souza Schacher, Luciane Macedo De MenezesAbstract:Objectives Quantify metal ion release in the saliva, considering that orthodontic appliances with soldered or welded parts may suffer corrosion and release metal ions into saliva, which can trigger adverse effects, such as hypersensitivity. Methods Sixty-four patients were distributed into four groups: G1 (control), G2 (silver-soldered Lingual Arch), G3 (laser-welded Lingual Arch), and G4 (TIG-welded Lingual Arch). Saliva samples were collected at four different points and were analyzed for ion release with ICP-MS. Results For Cr, Fe, Cu, and Sn ion concentrations among groups, there was no difference along collections and no statistically significant difference throughout collections for any group ( P > 0.05, with release values between 3.3 and 4.2 μg/L for Cr, 201 and 314.8 μg/L for Fe, 23.1 and 40.7 μg/L for Cu, and 13 and 27.7 μg/L for Sn). For Ni, G4 showed an increased ion release at T2 (14.3 μg/L) and T4 (34.5 μg/L), values with an interaction effect ( P 0.05). For Zn ions, there was a statistic difference from G4 to G1 and G2 ( P = 0.007 and P = 0.019), with median values ranging from 741.7 to 963.4 μg/L for G4, and for Ag ions, from G4 to G2 and G3 ( P
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sagittal changes in lower incisors by the use of Lingual Arch
Dental Press Journal of Orthodontics, 2013Co-Authors: Helen Letti, Susana Maria Deon Rizzatto, Luciane Macedo De Menezes, Chalana Sangalli Reale, Eduardo Martinelli Santayana De Lima, Fernando Lima MartinelliAbstract:OBJECTIVE: The objective of this study was to evaluate a sagittal variation on the lower incisors with the use of the Lingual Arch on the transition from mixed to permanent dentition. METHODS: The sample was constituted of 44 Caucasian patients (26 girls and 18 boys), divided in two groups: CG, control group, monitoring the lower Arch space with no orthodontic/orthopedic treatment during the rated period (n = 14); EG, experimental group, presenting anterior inferior mild crowding and installation of the Lingual Arch for space maintenance (n = 30). The position of the lower incisors was analyzed on computerized cephalometric tracings performed at the beginning of the monitoring (T1) and at the end, on the permanent dentition (T2). In order to evaluate the position of the incisors it was used Tweed and Steiner measurements: IMPA, 1.NB and 1-NB. The alterations were analyzed through the "t" test for paired samples, while the differences between the groups were analyzed through the "t" test for independent samples, as for sexual dimorphism. RESULTS: The values in T2 were greater in relation to T1 for all measurements on EG (IMPA, p = 0.038; 1.NB, p = 0.007 and 1-NB, p < 0.0001). On comparing the differences (T2-T1) between CG and EG, it can be gauged differences significantly superior for measure 1.NB (p = 0.002) and 1-NB (p < 0.0001) on EG. There was no statisticaly significant difference between genres. CONCLUSION: It was concluded that the lower incisors were projected after using the Lingual Arch to control the space on the transition from mixed to permanent dentition, however, within acceptable standards, not having difference between genres.
Helena Reis Souza Schacher - One of the best experts on this subject based on the ideXlab platform.
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metal ion quantification in the saliva of patients with Lingual Arch appliances using silver solder laser or tig welding
Clinical Oral Investigations, 2020Co-Authors: Helena Reis Souza Schacher, Luciane Macedo De MenezesAbstract:OBJECTIVES Quantify metal ion release in the saliva, considering that orthodontic appliances with soldered or welded parts may suffer corrosion and release metal ions into saliva, which can trigger adverse effects, such as hypersensitivity. METHODS Sixty-four patients were distributed into four groups: G1 (control), G2 (silver-soldered Lingual Arch), G3 (laser-welded Lingual Arch), and G4 (TIG-welded Lingual Arch). Saliva samples were collected at four different points and were analyzed for ion release with ICP-MS. RESULTS For Cr, Fe, Cu, and Sn ion concentrations among groups, there was no difference along collections and no statistically significant difference throughout collections for any group (P > 0.05, with release values between 3.3 and 4.2 μg/L for Cr, 201 and 314.8 μg/L for Fe, 23.1 and 40.7 μg/L for Cu, and 13 and 27.7 μg/L for Sn). For Ni, G4 showed an increased ion release at T2 (14.3 μg/L) and T4 (34.5 μg/L), values with an interaction effect (P 0.05). For Zn ions, there was a statistic difference from G4 to G1 and G2 (P = 0.007 and P = 0.019), with median values ranging from 741.7 to 963.4 μg/L for G4, and for Ag ions, from G4 to G2 and G3 (P < 0.001 for both), with lower medians for G4 (3.7-6.1 μg/L). For Cd ions there was a statistic difference from T1 to T4 in all groups (P = 0.016), with lower values for T4. CONCLUSIONS Different welding procedures may affect salivary ion concentrations. For most ions there was no significant increase comparing welding and comparing throughout points in the same group. Although TIG welding presented greater Ni ion release, this possibly occurred due to a bigger corrosion of the welded. CLINICAL RELEVANCE Determining the amount of released metal ions from the use of orthodontic appliances is relevant to ensure the safest method for patients. Welding procedures affect salivary ion concentrations, when comparing ion release triggered by one of the most common devices used for preventive/interceptive orthodontic treatments.
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Metal ion quantification in the saliva of patients with Lingual Arch appliances using silver solder, laser, or TIG welding
Clinical Oral Investigations, 2019Co-Authors: Helena Reis Souza Schacher, Luciane Macedo De MenezesAbstract:Objectives Quantify metal ion release in the saliva, considering that orthodontic appliances with soldered or welded parts may suffer corrosion and release metal ions into saliva, which can trigger adverse effects, such as hypersensitivity. Methods Sixty-four patients were distributed into four groups: G1 (control), G2 (silver-soldered Lingual Arch), G3 (laser-welded Lingual Arch), and G4 (TIG-welded Lingual Arch). Saliva samples were collected at four different points and were analyzed for ion release with ICP-MS. Results For Cr, Fe, Cu, and Sn ion concentrations among groups, there was no difference along collections and no statistically significant difference throughout collections for any group ( P > 0.05, with release values between 3.3 and 4.2 μg/L for Cr, 201 and 314.8 μg/L for Fe, 23.1 and 40.7 μg/L for Cu, and 13 and 27.7 μg/L for Sn). For Ni, G4 showed an increased ion release at T2 (14.3 μg/L) and T4 (34.5 μg/L), values with an interaction effect ( P 0.05). For Zn ions, there was a statistic difference from G4 to G1 and G2 ( P = 0.007 and P = 0.019), with median values ranging from 741.7 to 963.4 μg/L for G4, and for Ag ions, from G4 to G2 and G3 ( P
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Metal ion quantification in the saliva of patients with Lingual Arch appliances using silver solder, laser, or TIG welding
Clinical Oral Investigations, 2019Co-Authors: Helena Reis Souza Schacher, Luciane Macedo De MenezesAbstract:OBJECTIVES Quantify metal ion release in the saliva, considering that orthodontic appliances with soldered or welded parts may suffer corrosion and release metal ions into saliva, which can trigger adverse effects, such as hypersensitivity. METHODS Sixty-four patients were distributed into four groups: G1 (control), G2 (silver-soldered Lingual Arch), G3 (laser-welded Lingual Arch), and G4 (TIG-welded Lingual Arch). Saliva samples were collected at four different points and were analyzed for ion release with ICP-MS. RESULTS For Cr, Fe, Cu, and Sn ion concentrations among groups, there was no difference along collections and no statistically significant difference throughout collections for any group (P > 0.05, with release values between 3.3 and 4.2 μg/L for Cr, 201 and 314.8 μg/L for Fe, 23.1 and 40.7 μg/L for Cu, and 13 and 27.7 μg/L for Sn). For Ni, G4 showed an increased ion release at T2 (14.3 μg/L) and T4 (34.5 μg/L), values with an interaction effect (P 0.05). For Zn ions, there was a statistic difference from G4 to G1 and G2 (P = 0.007 and P = 0.019), with median values ranging from 741.7 to 963.4 μg/L for G4, and for Ag ions, from G4 to G2 and G3 (P
James A Coll - One of the best experts on this subject based on the ideXlab platform.
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systematic review and meta analysis of passive lower Lingual Arch for resolving mandibular incisor crowding and effects on Arch dimension
Pediatric Dentistry, 2019Co-Authors: C Y Chen, Abdullah A Marghalani, James A CollAbstract:: Purpose: This systematic review and meta-analysis assessed whether passive lower Lingual Arch (LLA) resolves mandibular incisor crowding and affects mandibular Arch dimension. Methods: We seArched PubMed, Web of Science, and Cochrane Database of Systemic Reviews for both randomized controlled trials and nonrandomized studies from 1940 to MArch 2018. Inclusion criteria were healthy children in mixed dentition with mandibular incisor crowding treated with LLA. Our primary outcome was the amount of mandibular incisor crowding resolved after LLA, and secondary outcomes were effects of LLA mandibular Arch dimension changes versus untreated controls (UTCs). Results: From 559 screened articles, seven qualified for systematic review and meta-analyses. The average resolution of mandibular incisor crowding after LLA was 5.10 mm (P=.001) with the evidence assessed as very low quality. Arch perimeter and Arch length changes were not significantly different between LLA and UTCs (P=0.20 and P=0.87, respectively). There were significant small increases of 0.79 mm in intercanine width (P<.001) and 0.69 mm in intermolar width (P=.003) with a low and a very low quality of evidence, respectively. Conclusions: Lower Lingual Arch was effective in resolving mandibular incisor crowding without any significant Arch perimeter or Arch length changes of greater than one mm.
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Systematic Review and Meta-Analysis of Passive Lower Lingual Arch for Resolving Mandibular Incisor Crowding and Effects on Arch Dimension.
Pediatric Dentistry, 2019Co-Authors: Chen Cy, Abdullah A Marghalani, Hsu Kc, Dhar, James A CollAbstract:: Purpose: This systematic review and meta-analysis assessed whether passive lower Lingual Arch (LLA) resolves mandibular incisor crowding and affects mandibular Arch dimension. Methods: We seArched PubMed, Web of Science, and Cochrane Database of Systemic Reviews for both randomized controlled trials and nonrandomized studies from 1940 to MArch 2018. Inclusion criteria were healthy children in mixed dentition with mandibular incisor crowding treated with LLA. Our primary outcome was the amount of mandibular incisor crowding resolved after LLA, and secondary outcomes were effects of LLA mandibular Arch dimension changes versus untreated controls (UTCs). Results: From 559 screened articles, seven qualified for systematic review and meta-analyses. The average resolution of mandibular incisor crowding after LLA was 5.10 mm (P=.001) with the evidence assessed as very low quality. Arch perimeter and Arch length changes were not significantly different between LLA and UTCs (P=0.20 and P=0.87, respectively). There were significant small increases of 0.79 mm in intercanine width (P
Peter Diedrich - One of the best experts on this subject based on the ideXlab platform.
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various anchorage approaches in unilateral mandibular molar distalization using a fixed Lingual Arch appliance
Journal of Orofacial Orthopedics-fortschritte Der Kieferorthopadie, 2004Co-Authors: Gero Kinzinger, Ulrike Fritz, Peter DiedrichAbstract:PATIENTS AND METHOD: Mean unilateral mandibular molar distalization of 3.33 +/- 1.28 mm was achieved in 20 patients (average age: 13 years, 1 month) by fitting an asymmetrically activated Lingual Arch appliance for an average treatment period of 4 months. Three different anchorage techniques were used: Anchorage was provided in seven patients by the Lingual arm of the appliance alone, while another seven patients received additional sectional Archwires, and another six patients sectional Archwires and lip bumpers. RESULTS AND DISCUSSION: Anchorage by means of the Lingual arm alone proved to be insufficient to prevent labial tipping of the incisors. The mean protrusion and labial tipping recorded at the lower incisors was 7.67 degrees +/- 1.53 degrees and 2.64 +/- 0.48 mm respectively. The anchorage quality was enhanced and satisfactory stabilization achieved by additionally inserting a sectional Archwire. In these cases the mean incisor protrusion and labial tipping was 1.75 degrees +/- 0.96 degree and 0.71 +/- 0.76 mm respectively and thus significantly lower (p < 0.01). The additional fitting of a lip bumper provided no further increase in anchorage quality (incisor protrusion 1.75 degrees +/- 2.87 degrees and 0.67 +/- 1.21 mm respectively). CONCLUSION: Fitting additional anchorage aids appears to have no direct impact on the extent and quality of molar distalization.
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Various Anchorage Approaches in Unilateral Mandibular Molar Distalization Using a Fixed Lingual Arch Appliance
Journal of Orofacial Orthopedics Fortschritte der Kieferorthopädie, 2004Co-Authors: Gero Kinzinger, Ulrike Fritz, Peter DiedrichAbstract:Patienten und Methode: Mit asymmetrisch aktivierten Lingualbogenapparaturen wurden in 20 Behandlungsfällen (Durchschnittsalter der Patienten: 13 Jahre, 1 Monat) im Unterkiefer bei einer durchschnittlichen Behandlungsdauer von 4 Monaten einseitig Molaren um 3,33 ± 1,28 mm distalisiert. Dabei wurden drei verschiedene Verankerungspräparationen vorgenommen: Bei sieben Patienten diente zur Verankerung lediglich der Lingualarm der Apparatur, bei sieben Patienten wurden zusätzlich Multibandteilbögen und bei weiteren sechs Patienten Multibandteilbögen und Lipbumper eingesetzt. Ergebnisse und Diskussion: Es zeigte sich, dass eine alleinige Verankerung durch den Lingualarm nicht ausreicht, um eine Labialkippung der Front zu vermeiden: Es erfolgte eine Protrusion der Unterkieferfront um durchschnittlich 7,67° ± 1,53° bzw. 2,64 ± 0,48 mm. Durch Einsetzen eines Multibandteilbogens konnten die Verankerungsqualität verbessert und eine ausreichende Stabilisierung erreicht werden. Die Schneidezahnprotrusion fiel mit durchschnittlich 1,75° ± 0,96° bzw. 0,71 ± 0,76 mm signifikant geringer aus (p < 0,01). Die zusätzliche Anwendung eines Lipbumpers erbrachte keine weitere Erhöhung der Verankerungsqualität (Schneidezahnprotrusion 1,75° ± 2,87° bzw. 0,67 ± 1,21 mm). Schlussfolgerung: Auf das Ausmaß und die Qualität der Molarendistalisation scheint das Hinzufügen zusätzlicher Verankerungshilfen keinen direkten Einfluss zu haben. Patients and Method: Mean unilateral mandibular molar distalization of 3.33 ± 1.28 mm was achieved in 20 patients (average age: 13 years, 1 month) by fitting an asymmetrically activated Lingual Arch appliance for an average treatment period of 4 months. Three different anchorage techniques were used: Anchorage was provided in seven patients by the Lingual arm of the appliance alone, while another seven patients received additional sectional Archwires, and another six patients sectional Archwires and lip bumpers. Results and Discussion: Anchorage by means of the Lingual arm alone proved to be insufficient to prevent labial tipping of the incisors. The mean protrusion and labial tipping recorded at the lower incisors was 7.67° ± 1.53° and 2.64 ± 0.48 mm respectively. The anchorage quality was enhanced and satisfactory stabilization achieved by additionally inserting a sectional Archwire. In these cases the mean incisor protrusion and labial tipping was 1.75° ± 0.96° and 0.71 ± 0.76 mm respectively and thus significantly lower (p < 0.01). The additional fitting of a lip bumper provided no further increase in anchorage quality (incisor protrusion 1.75° ± 2.87° and 0.67 ± 1.21 mm respectively). Conclusion: Fitting additional anchorage aids appears to have no direct impact on the extent and quality of molar distalization.
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combined therapy with pendulum and Lingual Arch appliances in the early mixed dentition
Journal of Orofacial Orthopedics-fortschritte Der Kieferorthopadie, 2003Co-Authors: Gero Kinzinger, Ulrike Fritz, Peter DiedrichAbstract:PATIENTS AND METHOD: In 20 patients with Arch length deficiency and anterior crowding, pendulum and Lingual Arch appliances were inserted simultaneously in the upper and in the lower Arch respectively to gain space. The patients were divided into two groups according to their dental eruption stage: ten children (six boys, four girls; mean age: 9 years, 6 months) were in the early mixed dentition, while an adolescent comparison group of the same size (three boys, seven girls; mean age: 12 years, 3 months) were in the permanent dentition at the beginning of treatment. AIM: The main purpose of the study was to investigate whether simultaneous therapy with pendulum and Lingual Arch appliances is to be recommended, i.e. whether this therapy should take place as interceptive treatment in the early mixed dentition or only in the permanent dentition in adolescence. Parameters were the extent and quality of dentoalveolar effects and the side effects (mesial movement of the incisors, protrusion of the incisors, tipping of molars). RESULTS: The treatment course was documented by means of study casts and lateral cephalograms. Assessment of the diagnostic records yielded the following findings: In the early treatment group the maxillary molars were distalized by the pendulum appliance by a mean distance of 4.0 +/- 1.46 mm, resulting in distal tipping by 6.1 +/- 2.18 degrees. The incisors were moved reciprocally by 1.08 +/- 1.06 mm to anterior and protruded by 7.65 +/- 4.84 degrees. In the comparison group molar distalization and molar tipping were less pronounced (2.86 +/- 1.54 mm/4.25 +/- 3.78 degrees ), while mesial movement of the incisors was comparably high at 1.62 +/- 0.99 mm. At only 3.8 +/- 2.9 degrees, incisor protrusion was significantly less pronounced than in the early treatment group (p = 0.045). The proportion of molar distalization in the total movement was higher in patients in the early mixed dentition: 79.83 +/- 15.38% vs 60.71 +/- 26.64%. During the early therapy with the Lingual Arch appliance in the lower Arch, the molars were uprighted to the distal by 2.4 +/- 0.97 degrees and the incisors were tipped to labial by 5.0 +/- 1.83 degrees. In the adolescent control group, molar uprighting was less pronounced and the degree of incisor protrusion was significantly lower (2.75 +/- 1.11 degrees, p = 0.004). CONCLUSION: With the appropriate indication, the combined therapy with the two compliance-independent appliances described can be recommended for gaining sagittal Arch length in the early mixed dentition.
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Combined Therapy with Pendulum and Lingual Arch Appliances in the Early Mixed Dentition
Journal of Orofacial Orthopedics Fortschritte der Kieferorthopädie, 2003Co-Authors: Gero Kinzinger, Ulrike Fritz, Peter DiedrichAbstract:Patients and Method: In 20 patients with Arch length deficiency and anterior crowding, pendulum and Lingual Arch appliances were inserted simultaneously in the upper and in the lower Arch respectively to gain space. The patients were divided into two groups according to their dental eruption stage: ten children (six boys, four girls; mean age: 9 years, 6 months) were in the early mixed dentition, while an adolescent comparison group of the same size (three boys, seven girls; mean age: 12 years, 3 months) were in the permanent dentition at the beginning of treatment. Aim: The main purpose of the study was to investigate whether simultaneous therapy with pendulum and Lingual Arch appliances is to be recommended, i.e. whether this therapy should take place as interceptive treatment in the early mixed dentition or only in the permanent dentition in adolescence. Parameters were the extent and quality of dentoalveolar effects and the side effects (mesial movement of the incisors, protrusion of the incisors, tipping of molars). Results: The treatment course was documented by means of study casts and lateral cephalograms. Assessment of the diagnostic records yielded the following findings: In the early treatment group the maxillary molars were distalized by the pendulum appliance by a mean distance of 4.0 ± 1.46 mm, resulting in distal tipping by 6.1 ± 2.18°. The incisors were moved reciprocally by 1.08 ± 1.06 mm to anterior and protruded by 7.65 ± 4.84°. In the comparison group molar distalization and molar tipping were less pronounced (2.86 ± 1.54 mm/4.25 ± 3.78°), while mesial movement of the incisors was comparably high at 1.62 ± 0.99 mm. At only 3.8 ± 2.9°, incisor protrusion was significantly less pronounced than in the early treatment group (p = 0.045). The proportion of molar distalization in the total movement was higher in patients in the early mixed dentition: 79.83 ± 15.38% vs 60.71 ± 26.64%. During the early therapy with the Lingual Arch appliance in the lower Arch, the molars were uprighted to the distal by 2.4 ± 0.97° and the incisors were tipped to labial by 5.0 ± 1.83°. In the adolescent control group, molar uprighting was less pronounced and the degree of incisor protrusion was significantly lower (2.75 ± 1.11°, p = 0.004). Conclusion: With the appropriate indication, the combined therapy with the two compliance-independent appliances described can be recommended for gaining sagittal Arch length in the early mixed dentition. Patienten und Methode: Bei 20 Patienten mit Einengung der Stützzonen und Frontengständen wurden zeitgleich Pendelapparaturen im Oberkiefer und Lingualbogenapparaturen im Unterkiefer zum Platzgewinn eingegliedert. Nach ihren Dentitionsstadien konnten die Patienten in zwei Gruppen unterteilt werden: Zehn Kinder (sechs Jungen, vier Mädchen) mit einem Durchschnittsalter von 9 Jahren und 6 Monaten befanden sich im frühen Wechselgebissstadium, eine zahlenmäßig gleich große Vergleichsgruppe von Jugendlichen (drei Jungen, sieben Mädchen; Durchschnittsalter: 12 Jahre und 3 Monate) wiesen bei Behandlungsbeginn eine bleibende Dentition auf. Ziel: Hauptziel dieser Studie war es zu untersuchen, ob eine zeitgleiche Therapie mit Pendel- und Lingualbogenapparaturen sinnvoll ist, d. h. ob diese schon als Interzeptivbehandlung im frühen Wechselgebiss oder erst im bleibenden Gebiss bei Jugendlichen erfolgen sollte. Beurteilungskriterien waren das Ausmaß und die Qualität der dentoalveolären Effekte sowie die Nebenwirkungen (Mesialisierung der Front, Frontzahnprotrusion, Molarenkippung). Ergebnisse: Der Behandlungsverlauf wurde mit Modellen und Fernröntgenseitenbildern dokumentiert. Die Auswertung der diagnostischen Unterlagen führte zu folgenden Ergebnissen: In der Frühbehandlungsgruppe wurden die Molaren im Oberkiefer durch die Pendelapparaturbehandlung um durchschnittlich 4,0 ± 1,46 mm distalisiert und sie erfuhren dabei eine Distalkippung von 6,1 ± 2,18°. Die Front wurde reziprok um 1,08 ± 1,06 mm nach anterior bewegt und um 7,65 ± 4,84° protrudiert. In der Vergleichsgruppe fielen die Molarendistalisation mit 2,86 ± 1,54 mm und die Molarenkippung mit 4,25 ± 3,78° geringer aus, die Mesialisierung der Front war mit 1,62 ± 0,99 mm vergleichsweise größer. Die Protrusion der Front war mit nur 3,8 ± 2,9° signifikant geringer als in der Frühbehandlungsgruppe (p = 0,045). Das Ausmaß der Molarendistalisation an der Gesamtbewegung war bei den Patienten im frühen Wechselgebissstadium größer: 79,83 ± 15,38% gegenüber 60,71 ± 26,64%. Im Unterkiefer wurden während der Lingualbogenapparaturbehandlung in der Frühbehandlungsgruppe die Molaren um 2,4 ± 0,97° nach distal aufgerichtet und die Fronten um 5,0 ± 1,83° nach labial gekippt. Bei der jugendlichen Kontrollgruppe war die Aufrichtung der Molaren vergleichsweise schwächer ausgeprägt und das Ausmaß der Frontprotrusion mit 2,75 ± 1,11° signifikant geringer (p = 0,004). Schlussfolgerung: Die Kombinationsbehandlung mit den beiden beschriebenen, kooperationsunabhängigen Behandlungsapparaturen ist bei entsprechender Indikation bereits im frühen Wechselgebiss zur Stützzonenerweiterung sinnvoll.
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Fixed Lingual Arch Appliance for Compliance-Free Unilateral Molar Distalization in the Mandible Three Case Studies
Journal of Orofacial Orthopedics Fortschritte der Kieferorthopädie, 2000Co-Authors: Gero Kinzinger, Ulrich Gross, Peter DiedrichAbstract:An asymmetrically activated Lingual Arch appliance enables rapid, unilateral molar distalization in the mandible without active patient compliance. Using the segmented Arch technique, the biomechanics involve only the tooth moved, in accordance with the 2-tooth concept, with a large, multi-rooted tooth segment acting as an anchoring unit. The anchorage system requires no maxillary involvement. Eine asymmetrisch aktivierte Lingualbogenapparatur ermöglicht im Unterkiefer eine rasche unilaterale Molarendistalisation ohne aktive Mitarbeit des Patienten. Im Sinne der segmentierten Bogentechnik reduziert sich entsprechend dem Zwei-Zahn-Konzept die Biomechanik auf den zu bewegenden Zahn und ein großes vielwurzeliges Zahnsegment als Verankerungseinheit. Auf die Einbeziehung des Oberkiefers kann beim Verankerungsaufbau verzichtet werden.
C Y Chen - One of the best experts on this subject based on the ideXlab platform.
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systematic review and meta analysis of passive lower Lingual Arch for resolving mandibular incisor crowding and effects on Arch dimension
Pediatric Dentistry, 2019Co-Authors: C Y Chen, Abdullah A Marghalani, James A CollAbstract:: Purpose: This systematic review and meta-analysis assessed whether passive lower Lingual Arch (LLA) resolves mandibular incisor crowding and affects mandibular Arch dimension. Methods: We seArched PubMed, Web of Science, and Cochrane Database of Systemic Reviews for both randomized controlled trials and nonrandomized studies from 1940 to MArch 2018. Inclusion criteria were healthy children in mixed dentition with mandibular incisor crowding treated with LLA. Our primary outcome was the amount of mandibular incisor crowding resolved after LLA, and secondary outcomes were effects of LLA mandibular Arch dimension changes versus untreated controls (UTCs). Results: From 559 screened articles, seven qualified for systematic review and meta-analyses. The average resolution of mandibular incisor crowding after LLA was 5.10 mm (P=.001) with the evidence assessed as very low quality. Arch perimeter and Arch length changes were not significantly different between LLA and UTCs (P=0.20 and P=0.87, respectively). There were significant small increases of 0.79 mm in intercanine width (P<.001) and 0.69 mm in intermolar width (P=.003) with a low and a very low quality of evidence, respectively. Conclusions: Lower Lingual Arch was effective in resolving mandibular incisor crowding without any significant Arch perimeter or Arch length changes of greater than one mm.