ABSTRACT
OBJECTIVE: This study aims to compare the effects of fast and slow expansion on nasal cavity structure. METHODS: A total of 40 patients were selected and randomly divided into two groups. Cone-beam computer tomography (CBCT) was obtained before and after surgery and used for comparing the changes in nasal structure before and after treatment. RESULTS: Fast expansion had resulted in greater changes in the basilar and nasal bone arch extension structures than slow expansion. No significant difference at maxillary width and nasal parenchyma. CONCLUSIONS: Rapid expansion therapy has more beneficial effects on nasal function.
Subject(s)
Maxilla , Palatal Expansion Technique , Cephalometry , Cone-Beam Computed Tomography , Humans , Maxilla/diagnostic imaging , Nasal Cavity , NoseABSTRACT
OBJECTIVE@#This study aims to compare the effects of fast and slow expansion on nasal cavity structure.@*METHODS@#A total of 40 patients were selected and randomly divided into two groups. Cone-beam computer tomography (CBCT) was obtained before and after surgery and used for comparing the changes in nasal structure before and after treatment.@*RESULTS@#Fast expansion had resulted in greater changes in the basilar and nasal bone arch extension structures than slow expansion. No significant difference at maxillary width and nasal parenchyma.@*CONCLUSIONS@#Rapid expansion therapy has more beneficial effects on nasal function.
Subject(s)
Humans , Cephalometry , Cone-Beam Computed Tomography , Maxilla , Diagnostic Imaging , Nasal Cavity , Nose , Palatal Expansion TechniqueABSTRACT
OBJECTIVES: To compare palatal symmetry, dimensions, and molar angulations following early mixed-dentition slow maxillary expansion with parameters in normal controls. MATERIALS AND METHODS: A total of 30 patients treated with a Haas-type expander for unilateral posterior crossbite with functional shift were compared with 30 controls matched for dental age, gender, and molar relationship. Records were taken before (T1) and after expansion (T2). Palatal width, surface area, volume, and molar angulations were measured on digitized models. Surface area and volume were split in half then divided into anterior, middle, and posterior segments to measure symmetry. Student's t-test was used to assess group differences. RESULTS: Mean intercanine width increased 4.65 mm, and intermolar width increased 4.76 mm. The treated mean surface area increased 127.05 mm2 compared with 10.35 mm2 in controls. The treated palatal volume increased 927.55 mm3 compared with 159.89 mm3 for controls. At T1, the controls showed significant differences in surface area and volume between the anterior palatal segments. At T2, this difference occurred in surface area of middle palatal segments of the treated sample. First permanent molars showed an increased buccal and distal inclination after treatment, opposite to controls. The increase in buccal inclination was greater on the crossbite side. CONCLUSIONS: The Haas-type expander results in similar expansion across the canines and first molars. A palate that is symmetrical before expansion may become asymmetric after expansion but only in the middle segment. Changes in individual molar angulation following palatal expansion can be measured without radiation imaging.
Subject(s)
Malocclusion/therapy , Palatal Expansion Technique , Case-Control Studies , Child , Female , Humans , Male , Malocclusion/pathology , Palate/anatomy & histology , Palate/pathology , Retrospective StudiesABSTRACT
With the advent of 'Shape Memory' (NiTi) alloys and their subsequent introduction in the field of Orthodontics, there have been enhanced efforts to utilize this property in different types of archwires and springs. Greater familiarity and skill has led to designing of Nitanium Palatal Expander (NPE). This appliance has been introduced for slow maxillary expansion and leads to dramatic reduction of clinical time and enhancement of successful results.
