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1.
Shanghai Kou Qiang Yi Xue ; 30(2): 167-172, 2021 Apr.
Artículo en Chino | MEDLINE | ID: mdl-34109356

RESUMEN

PURPOSE: The aim of this study was to compare the difference of dental arch and palatal morphology between children with impacted maxillary canine and without impacted maxillary canine, to provide reference for early diagnosis and treatment of impacted maxillary canine. METHODS: Sixty-two children, 8-11 years of age (9.8±1.04 years), were divided into experimental group and control group, with 31 children in each group. Digital casts were obtained using 3D laser scanner from maxillary models. Dental arch width, length, basal bone width, palatal width, height, surface area and volume were measured. Paired t test was performed with SPSS 24.0 software package. RESULTS: Dental arch width and palatal width were significantly narrower in experimental group than in control group(P<0.05), but there was on significant difference in dental arch length, basal bone width and palatal height between the two groups(P>0.05).Additionally, palatal surface area and volume were significantly larger in control group than in experimental group(P<0.05). CONCLUSIONS: Children with impacted maxillary canine have smaller maxillary dental arch width, palatal width, palatal surface area and volume compared to control group. Dental arch width, palatal width, palatal surface area and volume should be taken into consideration when early identifying impacted maxillary canine.


Asunto(s)
Dentición Mixta , Diente Impactado , Niño , Diente Canino/diagnóstico por imagen , Arco Dental/diagnóstico por imagen , Humanos , Maxilar/diagnóstico por imagen , Paladar (Hueso)/diagnóstico por imagen , Diente Impactado/diagnóstico por imagen
2.
Compend Contin Educ Dent ; 42(5): 220-226; quiz 228, 2021 May.
Artículo en Inglés | MEDLINE | ID: mdl-33980019

RESUMEN

In this study of orthodontic and surgical management of impacted maxillary canines, the current literature is reviewed and a decision tree is presented to assist clinicians in determining the optimal treatment based on available evidence. Impacted canines have a prevalence of 2% and are more common in females. Palatal impactions are present in around 75% of cases. These trends are observed worldwide with small variations in different populations. Diagnosis through clinical examination and conventional imaging can be complemented with cone-beam computed tomography imaging when necessary. Early intervention by extraction of deciduous canines is indicated when the canine is impacted in sectors 2 or 3 and has an angle of 20 to 30 degrees in relation to the vertical line. Other early management approaches involve rapid palatal expansion or distalization of posterior teeth, when possible. Surgical orthodontic treatment is required when early intervention is unsuccessful. For buccal impactions, the canine position relative to the mucogingival junction determines the choice of surgical procedure; for palatal impactions, the open surgical procedure seems to be preferred. In some situations, however, a closed eruption has precise indications. Use of efficient orthodontic mechanics reduces treatment complications and may be complemented with the use of nitinol piggybacks, swinging gates, modified transpalatal arches, and temporary anchorage devices. Frequent complications with impactions include canine ankylosis, root resorption of the neighboring lateral or central incisor, and gingival esthetic differences between the impacted canine and the contralateral canine upon treatment completion.


Asunto(s)
Resorción Radicular , Diente Impactado , Tomografía Computarizada de Haz Cónico , Diente Canino/diagnóstico por imagen , Diente Canino/cirugía , Estética Dental , Femenino , Humanos , Incisivo , Maxilar/cirugía , Técnica de Expansión Palatina , Diente Impactado/diagnóstico por imagen , Diente Impactado/cirugía
4.
Biomed Res Int ; 2021: 6635575, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-33898625

RESUMEN

Objectives: The aim of this retrospective study was to determine the position of the impacted maxillary canine (IMC) and then to inspect the frequency, location, and extent of the consequent root resorption (RR) of the adjacent teeth by using CBCT. Materials and Methods: Forty-one patients aged 12-68 who have 56 IMC detected on CBCT images were retrospectively examined in 3D. The canine position was determined by assessing the side of impaction, buccopalatal location, the distance of the canine cusp tip to the midline and to the occlusal plane, and canine angulation to the midline. RR of adjacent teeth was analyzed by investigating the nearest location of ectopic canine to adjacent teeth in horizontal and vertical dimensions in addition to measuring the degree of RR. Results: Twenty-seven (48.2%) impacted canines were on the right side, and 29 (51.8%) were on the left. Most of these teeth 31 (55.4%) were located palatally, while buccal impaction was seen in only 13 (23.2%) canines and 12 (21.4%) were located centrally. The mean distance of the ectopic canine cusp tip to the occlusal plane was significantly higher in males (14.4 mm) than in females (10.7 mm). RR was seen in 9 central incisors (31.03%) and 21 lateral incisors (41.17%) as well as one case in the first and second premolar. This RR was slight for all the adjacent central incisors and premolars. Conclusions: IMC is more frequent in females, palatally and apically. When left untreated, it may cause RR of some of the adjacent teeth with various degrees, however, with no gender preference.


Asunto(s)
Tomografía Computarizada de Haz Cónico , Diente Canino/diagnóstico por imagen , Maxilar/diagnóstico por imagen , Resorción Radicular/diagnóstico por imagen , Diente Impactado/diagnóstico por imagen , Adolescente , Adulto , Anciano , Niño , Femenino , Humanos , Masculino , Persona de Mediana Edad , Adulto Joven
5.
Am J Orthod Dentofacial Orthop ; 159(3): 305-311, 2021 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-33641814

RESUMEN

INTRODUCTION: The early diagnosis and interception of potential maxillary canine impaction is the most desirable approach for correcting their path of eruption. However, there is still a lack of evidence regarding the effect of rapid maxillary expansion (RME) on labially impacted canines. This study aimed to investigate the age-related effect of RME on labially impacted maxillary canines in order to reduce the risk of their impaction in the mixed dentition and to examine the proper timing of interceptive treatment. METHODS: All patients aged 7-10 years were treated with an RME appliance using the same protocol. The distance to the occlusal plane, axis to the midline, and distribution in different sectors-depending on the patients' age-were evaluated for maxillary canines before and after treatment on panoramic radiographs in order to detect changes in the position of the impacted canines. These geometric measurements in the impacted canines were also validated by observing the nontreated canines at each age. RESULTS: Significant differences existed between the impacted canines and the erupted canines in all 3 categories in all age groups. RME treatment modulated the position of the impacted canines in all age groups. Interestingly, a statistically significant difference before and after RME in all categories was detected in patients aged <8 years. A discriminant analysis also showed a positive association of RME treatment with the risk of labially impacted canines. The standardized regression coefficients showed that the angulation of the maxillary canine was the most important predictor for impaction. CONCLUSIONS: Our findings indicate that RME treatment in the early mixed dentition was effective for managing labially impacted maxillary canines. An age of 7-8 years with early mixed dentition might be the most appropriate timing for therapeutic intervention on the basis of RME treatment for buccal canine impaction.


Asunto(s)
Técnica de Expansión Palatina , Diente Impactado , Estudios de Casos y Controles , Niño , Diente Canino/diagnóstico por imagen , Humanos , Maxilar/diagnóstico por imagen , Diente Impactado/diagnóstico por imagen , Diente Impactado/terapia
6.
Am J Orthod Dentofacial Orthop ; 159(6): e461-e471, 2021 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-33785231

RESUMEN

INTRODUCTION: The initial position of an impacted maxillary canine might influence the outcome of surgically assisted exposure and orthodontic alignment. Therefore, the purpose of this study was to evaluate existing correlations between the initial position of the maxillary canine and the outcomes of treatment. METHODS: A retrospective cohort study was designed, containing data of 132 patients (47 males, 106 females; median age at the date of surgical exposure 14 ± 4.6 years; range, 10-39 years) with a total of 153 impacted maxillary canines. The sample was based on orthodontic referrals over 4 years at the Department of Oral and Maxillofacial Surgery, Rijnstate Hospital, Arnhem, the Netherlands. The esthetic outcome, treatment duration, and success and failure rate were investigated in relation to the initial position of the maxillary canine as assessed on pretreatment panoramic radiographs (vertical and anteroposterior sector position and angulation of the canine [α-angle]). The esthetic evaluation was performed using the Maxillary Canine Aesthetic Index. The success of treatment was defined as achieving a fully functional eruption of the canine, with an esthetically excellent result, without the need for reinterventions. Failure of treatment was defined as the need for reintervention or removal of the canine. RESULTS: In 96% of the impacted canines, a successful orthodontically assisted eruption was achieved. Age, vertical distance, and angulation are predictors of the esthetic outcome of impacted canines after treatment. Age, bilateral impaction, sector, vertical distance, and angulation are predictors of treatment duration. Age, vertical distance, and buccolingual position are predictors of the need for reintervention. CONCLUSIONS: Pretreatment radiographic variables can help in predicting the outcome and treatment duration of surgically exposed maxillary impacted canines.


Asunto(s)
Maxilar , Diente Impactado , Diente Canino/diagnóstico por imagen , Diente Canino/cirugía , Estética Dental , Femenino , Humanos , Masculino , Maxilar/diagnóstico por imagen , Maxilar/cirugía , Países Bajos , Estudios Retrospectivos , Factores de Riesgo , Diente Impactado/diagnóstico por imagen , Diente Impactado/cirugía
7.
Am J Orthod Dentofacial Orthop ; 159(3): 258-270, 2021 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-33495062

RESUMEN

INTRODUCTION: The objective of this study was to evaluate the 3-dimensional changes in alveolar bone morphology after traction of buccally vs palatally unilateral maxillary impacted canines (MIC). METHODS: Following a split-mouth model, 27 cone-beam computed tomography images of unilaterally MIC (14 palatally and 13 buccally) and 27 contralateral unimpacted controls were obtained before and after traction using nickel-titanium closed-coil springs and a rigid anchorage appliance. Alveolar bone height and width were measured in the axial, coronal, and sagittal slides by 3 calibrated orthodontists, taking into account the impaction characteristics. A t test was used to compare the 2 groups, and a paired t test was applied for intragroup comparisons (both sides). A multiple linear regression model was used to evaluate the influence of the predictor variables on alveolar bone dimensional changes. RESULTS: The alveolar height showed a significantly greater decrease in palatally MIC (2.09 to 2.79 mm) than buccally MIC (0.28 to 0.57 mm) (P <0.05) for all surfaces. However, the alveolar width increased similarly in both groups up to 1.36 mm. In general, the affected side had a more significant height loss and greater increases in alveolar width than the nonaffected side. Regression analysis indicated that buccally MIC and age decreased alveolar changes, whereas female sex increased alveolar changes (P <0.05). CONCLUSIONS: MIC traction with nickel-titanium closed-coil springs and heavy anchorage induces significant 3-dimensional changes in alveolar bone characterized by alveolar bone height decreases and cervical alveolar bone width increases. The height decrease is greater in palatally than in buccally MIC.


Asunto(s)
Diente Impactado , Tracción , Tomografía Computarizada de Haz Cónico , Diente Canino/diagnóstico por imagen , Femenino , Humanos , Incisivo , Maxilar/diagnóstico por imagen , Estudios Retrospectivos , Diente Impactado/diagnóstico por imagen
8.
Head Face Med ; 17(1): 1, 2021 Jan 15.
Artículo en Inglés | MEDLINE | ID: mdl-33451343

RESUMEN

BACKGROUND: The aim of the present study was to compare two different anchorage systems efficiency to disinclude impacted maxillary canines using as evaluation tool superimposed Cone Beam Computed Tomography (CBCTs). METHODS: The study has been conducted with two parallel groups with an allocation ratio of 1:1. Group test received treatment using as anchorage a miniscrew, control group was treated using an anchorage unit a trans palatal arch (TPA). Both groups received a calibrated traction force of 50 g. CBCT before treatment and 3 months after traction were superimposed and canine tip and root movement were evaluated in mm/month ratio. RESULTS: No differences were observed between groups for apex displacement, tip displacement and observation timespan. Twenty-two patients (12 female, 10 male, mean age:13.4 years) undergoing orthodontic treatment for impacted maxillary canines were recruited for this study. No differences were observed between groups for apex displacement, tip displacement and observation timespan. CONCLUSIONS: The present pilot study provided no evidence that indirect anchorage on miniscrews could make canine disimpaction faster than anchorage on a TPA. An apex root movement of 0.4-0.8 mm per month was found, while average canine tip movement ranged between 1.08 mm and 1.96 mm per month. No miniscrews failures were observed. TRIAL REGISTRATION: The study reports the preliminary results of the randomized clinical trial registered at www.register.clinicaltrials.gov (registration number: NCT01717417 ).


Asunto(s)
Diente Canino , Diente Impactado , Adolescente , Tomografía Computarizada de Haz Cónico , Diente Canino/diagnóstico por imagen , Femenino , Humanos , Masculino , Maxilar/diagnóstico por imagen , Proyectos Piloto , Diente Impactado/diagnóstico por imagen , Diente Impactado/cirugía
9.
Am J Orthod Dentofacial Orthop ; 159(2): e135-e147, 2021 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-33388201

RESUMEN

INTRODUCTION: The purposes of this study were to characterize the 3-dimensional position of teeth adjacent to impacted canines and examine whether impaction affects canine development using cone-beam computed tomography. METHODS: Cone-beam computed tomography images of 34 unilateral maxillary impacted canines (12 males, 22 females; mean age, 16.5 years) were collected. Twenty-one canines were palatally impacted (PIC), and 13 were buccally impacted (BIC). Angular measurements of lateral incisors (LIs), first premolars, and the impacted canines positions relative to a 3-dimensional coordinate system and canines' volume, length, and shape of the roots, were compared between the affected and contralateral control sides. The influence of canine position and severity of impaction was examined. Statistics included the paired t test, Wilcoxon signed rank test, and McNemar test. RESULTS: In the PIC group, LIs showed significant mesiobuccal rotation (-17.1°), mesial angulation (8.4°), and buccal root torque (5°) and first premolars mesiobuccal rotation (6.1°). In the BIC group, LIs displayed mesiobuccal rotation (-18°) and significant palatal root torque (-5°). The canine volumes were similar in BICs and slightly smaller in PICs. The lengths were shorter in both, but root hooks were more prevalent in BICs. The severity of impaction affected the measured variables. CONCLUSIONS: The differential position of the adjacent teeth is pathognomonic for PIC vs BIC, and impaction seems to affect canine development. The findings provide evidence-based clinical and radiographical clues for early diagnosis of canine displacement and planning the most efficient treatment strategy. In addition, they support timely orthodontic eruption before the development of the apical third of the root.


Asunto(s)
Diente Canino , Diente Impactado , Adolescente , Diente Premolar , Tomografía Computarizada de Haz Cónico , Diente Canino/diagnóstico por imagen , Femenino , Humanos , Incisivo , Masculino , Maxilar/diagnóstico por imagen , Diente Impactado/diagnóstico por imagen
10.
BMC Oral Health ; 21(1): 10, 2021 01 06.
Artículo en Inglés | MEDLINE | ID: mdl-33407377

RESUMEN

BACKGROUND: Knowledge of gingival thickness (GT) and alveolar crest thickness (ACT) is essential when performing surgical and non-surgical procedures in the maxillary anterior teeth region. This study aimed at evaluating the GT and ACT in the maxillary anterior teeth region using 15-MHz B-mode Ultrasonic (US). METHODS: A total of 300 teeth from 50 healthy participants, comprising 25 women and 25 men, aged between 18 and 35 years were analyzed. We measured labial periodontal tissue structures of maxillary anterior teeth, including GT and ACT, at 3 mm apical to the gingival margin (GT3) and the crestal level, respectively. The GT and ACT measurements were correlated. RESULTS: The mean labial GT3 of the maxillary central incisors, lateral incisors, and canines were 1.24 ± 0.03 mm, 1.21 ± 0.03 mm and 1.11 ± 0.03 mm, respectively. Canine GT3 was significantly thin than those in the central and lateral incisors (P < 0.05). With regards to labial ACT, we recorded 0.79 ± 0.03 mm, 0.76 ± 0.02 mm and 0.73 ± 0.02 mm for maxillary central incisors, lateral incisors and canines, respectively. There were no significant differences in ACT of maxillary anterior teeth (P > 0.05). GT3 of men was greater than that of women (P < 0.05). In addition, GT and ACT were positively correlated (r = 0.32, P < 0.01). CONCLUSION: 15-MHz B-mode US is an effective tool for measuring labial GT and ACT of anterior teeth. There are sex-associated differences in GT3 and the correlation between the GT3 and ACT of anterior teeth is moderately positive.


Asunto(s)
Diente Canino , Maxilar , Adolescente , Adulto , Tomografía Computarizada de Haz Cónico , Diente Canino/diagnóstico por imagen , Femenino , Encía/diagnóstico por imagen , Humanos , Incisivo/diagnóstico por imagen , Masculino , Maxilar/diagnóstico por imagen , Ultrasonografía , Adulto Joven
11.
Am J Orthod Dentofacial Orthop ; 159(3): e233-e243, 2021 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-33487497

RESUMEN

INTRODUCTION: This study aimed to compare the extent of buccal bone defects (dehiscences and fenestrations) and transversal tooth movement of mandibular lateral segments in patients after orthodontic treatment with and without piezocision in cone-beam computed tomography and digital dental models. METHODS: The study sample of this study consisted of cone-beam computed tomography scans and digital dental models taken before (T0) and after (T1) orthodontic treatment of 36 patients with moderate mandibular anterior crowding. The experimental group consisted of 17 patients that had piezocision performed at the beginning of treatment with the goal of accelerating tooth movement, which was compared with 19 patients who did not receive piezocision. The measurement of bone defects, buccolingual inclination, and transversal distances of the tooth in the mandibular lateral segments (mandibular canines, premolars, and first molars) were evaluated at baseline and at the end of the orthodontic treatment. RESULTS: Overall, an increase in dehiscences, buccal inclination, and arch width from T0 to T1 was observed in both groups, but no statistically significant difference was found between groups. A significant increase in fenestrations from T0 to T1 was observed only for the canines in the experimental group. No statistically significant association was found between the increase of dehiscences and the amount of buccolingual inclination or transversal width changes. However, the changes in transversal width were statistically significantly associated with the increase in buccal inclination at the canines, first and second premolars. CONCLUSIONS: No significant differences were found in buccal dehiscences and transversal tooth movement (buccolingual inclination and arch width) of mandibular lateral segments between patients after orthodontic treatment with and without piezocision. Dehiscences, buccal inclination, and arch width significantly increased from T0 to T1 in both groups.


Asunto(s)
Mandíbula , Técnicas de Movimiento Dental , Estudios de Casos y Controles , Tomografía Computarizada de Haz Cónico , Diente Canino/diagnóstico por imagen , Humanos , Mandíbula/diagnóstico por imagen , Mandíbula/cirugía , Estudios Retrospectivos
12.
Am J Orthod Dentofacial Orthop ; 159(2): 167-174, 2021 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-33342674

RESUMEN

INTRODUCTION: This research aimed to analyze the prevalence of root dilaceration in buccally impacted canines (BICs) and palatally impacted canines (PICs) with their adjacent teeth based on a retrospective cone-beam computed tomography (CBCT) investigation. METHODS: Pretreatment CBCT images of 145 subjects with unilateral maxillary canine impaction and 145 age- and sex-matched subjects without impaction were used. Prevalence of dilaceration (subclassified to root curvature and apical hook based on severity) in canines and adjacent teeth was determined in CBCT records. The root length of maxillary impacted canines was measured for further morphologic evaluations. RESULTS: Impacted canines had a significantly higher prevalence of root dilaceration than the control group and compared with the erupted contralateral canines in the experimental group (P < 0.001 for both). A significantly higher prevalence of root dilaceration was found in adjacent lateral incisors of the PICs subgroup than that of the control group (P < 0.001). Adjacent premolars had a higher prevalence of dilacerated roots in the PICs subgroup (P < 0.001) than the control group, but not for the BICs subgroup. Significantly higher prevalence of curvature (P < 0.001 for both) and hook (P = 0.008 and P < 0.001, respectively) were found in BICs and PICs roots compared with the control group. Both types of impacted canines had significantly shorter roots than the control group (P < 0.001 for both). CONCLUSIONS: BICs and PICs have a higher tendency to present root dilaceration and shorter roots. Unlike BICs, adjacent teeth to PICs were more frequently observed to have root dilaceration.


Asunto(s)
Diente Canino , Diente Impactado , Diente Premolar , Tomografía Computarizada de Haz Cónico , Diente Canino/diagnóstico por imagen , Humanos , Incisivo , Maxilar/diagnóstico por imagen , Estudios Retrospectivos , Diente Impactado/diagnóstico por imagen
13.
Angle Orthod ; 90(3): 457-466, 2020 05 01.
Artículo en Inglés | MEDLINE | ID: mdl-33378438

RESUMEN

Maxillary canine and first premolar transposition is a complicated dental anomaly to treat, especially if the clinician's goal is to orthodontically move the canine into its normal position. Early diagnosis with cone-beam computed tomography simplifies the treatment of this pathology. This case report describes a patient with bilateral transposition, one complete and the other incomplete, involving the maxillary canine and the first premolar (Mx.C.1P). The orthodontic treatment involved the correction of both transpositions. In the complete transposition, the traction was mesial and upward to move the canine into a more apical position with a wider dentoalveolar process for easier crown interchange.


Asunto(s)
Erupción Ectópica de Dientes , Diente Premolar/diagnóstico por imagen , Diente Premolar/cirugía , Tomografía Computarizada de Haz Cónico , Diente Canino/diagnóstico por imagen , Humanos , Maxilar/diagnóstico por imagen , Erupción Ectópica de Dientes/diagnóstico por imagen , Erupción Ectópica de Dientes/terapia
14.
Angle Orthod ; 90(6): 751-757, 2020 11 01.
Artículo en Inglés | MEDLINE | ID: mdl-33378508

RESUMEN

OBJECTIVES: To compare the impact of primary canine and primary first molar extractions with extractions of only the primary canine regarding correction of palatally displaced canines (PDCs). MATERIALS AND METHODS: Thirty-two children aged 9.5-13.5 years with 48 PDCs were randomly allocated to either the double-extraction group (DEG) or single-extraction group (SEG). Clinical and radiographic examinations were performed at baseline and at 6-month intervals until the canine emerged or orthodontic treatment was started. Outcome measures were: emergence of maxillary canine (yes/no), emergence of maxillary canine into a favorable position (yes/no), and maxillary canine positional change (angulation and sector). Factors influencing PDC emergence were analyzed using logistic regression. RESULTS: In the DEG, 64% (16/25) of canines emerged into the oral cavity vs 78% (18/23) in the SEG (P = .283). Favorable PDC position at trial end was seen in 64% (16/25) of the DEG vs 57% (13/23) of the SEG (P = .600). Significant distal movement of PDCs was recorded in the DEG and SEG, though no significant difference was observed between groups. Significant predictors of canine emergence were initial canine angulation (Angle A) (P = .008) and space conditions at T0 (P = .030). CONCLUSIONS: Double or single primary tooth extraction procedures are equivalent in supporting PDC eruption into the oral cavity and into a favorable position in the dental arch. Initial canine angulation and space assessments may be used as predictors of successful PDC eruption.


Asunto(s)
Erupción Ectópica de Dientes , Diente Impactado , Adolescente , Niño , Diente Canino/diagnóstico por imagen , Diente Canino/cirugía , Humanos , Maxilar/diagnóstico por imagen , Maxilar/cirugía , Ortodoncia Interceptiva , Erupción Ectópica de Dientes/diagnóstico por imagen , Erupción Ectópica de Dientes/terapia , Extracción Dental , Diente Primario , Diente Impactado/diagnóstico por imagen , Diente Impactado/cirugía , Resultado del Tratamiento
15.
Angle Orthod ; 90(6): 873-880, 2020 11 01.
Artículo en Inglés | MEDLINE | ID: mdl-33378512

RESUMEN

Transposition of maxillary teeth is an eruptive disturbance occurring in approximately 1 of every 300 orthodontic patients. Such cases are frequently very challenging in terms of treatment planning and orthodontic management. The canine is one of the most commonly transposed teeth, ectopically positioned with either the lateral incisor or the first premolar. This case report illustrates unique orthodontic treatment, describes treatment procedures, and presents the final outcome of bilateral maxillary canine-lateral incisor complete transpositions in which the involved teeth were moved to their clinically normal position in the dental arch without extracting premolars.


Asunto(s)
Erupción Ectópica de Dientes , Diente Premolar , Diente Canino/diagnóstico por imagen , Humanos , Incisivo , Maxilar/diagnóstico por imagen , Erupción Ectópica de Dientes/diagnóstico por imagen , Erupción Ectópica de Dientes/terapia
16.
Angle Orthod ; 90(6): 801-810, 2020 11 01.
Artículo en Inglés | MEDLINE | ID: mdl-33378514

RESUMEN

OBJECTIVES: To assess the mechanical environment for three fixed appliances designed to retract the lower anterior segment. MATERIALS AND METHODS: A cone-beam computed tomography scan provided three-dimensional morphology to construct finite element models for three common methods of lower anterior retraction into first premolar extraction spaces: (1) canine retraction with a T-loop, (2) en-masse space closure with the power-arm on the canine bracket (PAB), and (3) power-arm directly attached to the archwire mesial to the canine (PAW). Half of the symmetric mandibular arch was modeled as a linear, isotropic composite material containing five teeth: central incisors (L1), lateral incisor (L2), canine (L3), second premolar (L4), and first molar (L5). Bonded brackets had 0.022-in slots. Archwire and power-arm components were 0.016 × 0.022 in. An initial retraction force of 125 cN was used for all three appliances. Displacements were calculated. Periodontal ligament (PDL) stresses and distributions were calculated for four invariants: maximum principal, minimum principal, von Mises, and dilatational stresses. RESULTS: The PDL stress distributions for the four invariants corresponded to the displacement patterns for each appliance. T-loop tipped the canine(s) and incisors distally. PAB rotated L3 distal in, intruded L2, and extruded L1. PAW distorted the archwire resulting in L3 extrusion as well as lingual tipping of L1 and L2. Maximum stress levels in the PDL were up to 5× greater for the PAW than the T-loop and PAB methods. CONCLUSIONS: T-loop of this type is more predictable because power-arms can have rotational and archwire distortion effects that result in undesirable paths of tooth movement.


Asunto(s)
Incisivo , Técnicas de Movimiento Dental , Diente Premolar , Fenómenos Biomecánicos , Diente Canino/diagnóstico por imagen , Análisis de Elementos Finitos , Alambres para Ortodoncia , Estrés Mecánico
17.
Gerodontology ; 37(4): 411-415, 2020 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-33179813

RESUMEN

OBJECTIVE: This report discusses the clinical relevance of a novel case of an odontoma and transmigrated canine in the setting of florid cemento-osseous dysplasia (COD), hypercementosis and moderate to severe periodontitis in a 66-year-old patient. BACKGROUND: An odontoma may infrequently impede tooth eruption and rarely has been implicated with canine transmigration. COD is a benign fibro-osseous lesion associated with decreased vascularity and poorer surgical intervention. MATERIALS AND METHODS: A partially edentulous woman, in no acute distress, underwent clinical and radiographic evaluation in pursuit of comprehensive dental care. RESULTS: Radiographic assessment demonstrated multiple occult pathologies of the mandible, including compound odontoma, canine transmigration, florid COD, hypercementosis and moderate to severe periodontitis, a concurrence thought to be previously unreported. Furthermore, the presence of the odontoma and transmigrated canine is apparently the second reported case in the geriatric population. CONCLUSIONS: The attending clinician should carefully weigh removal of an impacted and transmigrated canine associated with an odontoma in the setting of COD and compromised bone, particularly in older individuals. When surgical intervention is deferred in these clinical situations, patients should continue to be monitored for clinical and radiographic development of pathologic processes.


Asunto(s)
Displasia Fibrosa Ósea , Odontoma , Diente Impactado , Anciano , Diente Canino/diagnóstico por imagen , Femenino , Humanos , Mandíbula , Odontoma/complicaciones , Odontoma/diagnóstico por imagen , Odontoma/cirugía , Diente Impactado/diagnóstico por imagen , Diente Impactado/cirugía
18.
Am J Orthod Dentofacial Orthop ; 158(4): e29-e36, 2020 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-32988572

RESUMEN

INTRODUCTION: The primary objective of this study was to compare the aesthetic outcome of palatally impacted canines treated with an open or closed surgical exposure technique using the Maxillary Canine Aesthetic Index (MCAI) at least 1 year after debonding. Secondary objectives were set on the periodontal outcome, tooth color, pulpal status, and self-reported contentment. METHODS: The sample of this retrospective study consisted of 53 patients with an average age of 20 years and 7 months at the time of the investigation. A total of 53 canines were investigated. All canines were aesthetically scored with the MCAI. Other outcome variables were investigated, such as gingival inflammation, pocket probing depth, vitality, percussion sensitivity, and tooth color. All patients received a questionnaire to evaluate their appraisal of different parameters. RESULTS: A statistically significant difference (P < 0.001) was found between the groups treated with an open and closed technique in terms of the MCAI. The closed technique scored excellent in terms of aesthetics, whereas the open technique scored good. The closed technique had more discoloration (P < 0.001) and a delayed response to the cold test (P = 0.021). In general, patients were satisfied with both techniques but considered the treatment time to be very long. CONCLUSIONS: A closed surgical exposure of palatally impacted maxillary canines is preferred in terms of aesthetics when measured with the MCAI. There was no difference between the 2 techniques in terms of periodontal outcome. Canines treated with a closed exposure tended to have a darker color and delayed response to cold testing.


Asunto(s)
Diente Canino/diagnóstico por imagen , Diente Canino/cirugía , Diente Impactado/diagnóstico por imagen , Diente Impactado/cirugía , Adulto , Estética , Estudios de Seguimiento , Humanos , Estudios Retrospectivos , Adulto Joven
19.
Am J Orthod Dentofacial Orthop ; 158(4): 579-586.e1, 2020 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-32826123

RESUMEN

INTRODUCTION: The study aimed to investigate the effects of micro-osteoperforations (MOPs) on the mandibular bone volume/tissue volume (BV/TV) ratio changes and the rate of orthodontic tooth movement using cone-beam computed tomography images. Another objective was to evaluate the effects of MOP frequency intervals (4 weeks, 8 weeks, and 12 weeks) on the BV/TV ratio and rate of tooth movement. METHODS: In 24 participants, 140-200 g of force was applied for mandibular canine retraction. Three MOPs were made according to the scheduled intervals of the 3 different groups: group 1 (MOP 4 weeks), group 2 (MOP 8 weeks), and group 3 (MOP 12 weeks) directly at the mandibular buccal cortical bone of extracted first premolars sites. Cone-beam computed tomography scans were obtained at the 12th week after MOP application. Computed tomography Analyzer software (version 1.11.0.0; Skyscan, Kontich, Belgium) was used to compute the trabecular alveolar BV/TV ratio. RESULTS: A significant difference was observed in the rate of canine movement between control and MOP. Paired t test analysis showed a significant difference (P = 0.001) in the mean BV/TV ratio between control and MOP sides in all the frequency intervals groups. However, the difference was significant only in group 1 (P = 0.014). A strong negative correlation (r = -0.86) was observed between the rate of canine tooth movement and the BV/TV ratio at the MOP side for group 1 and all frequency intervals together (r = -0.42). CONCLUSIONS: The rate of orthodontic tooth movement can be accelerated by the MOP technique with frequently repeated MOPs throughout the treatment.


Asunto(s)
Diente Canino/diagnóstico por imagen , Técnicas de Movimiento Dental , Diente Premolar , Tomografía Computarizada de Haz Cónico , Mandíbula/diagnóstico por imagen , Mandíbula/cirugía
20.
Indian J Dent Res ; 31(3): 408-413, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32769275

RESUMEN

Aim: The aim of this study was to find a correlation between the permanent maxillary canine eruption and the cervical vertebral maturation index (CVMI). Materials and Methods: 145 subjects (73 male and 72 female) in the age of 7-14 years were examined radiographically with lateral cephalographs and orthopantomographs. The CVM patterns were evaluated on the lateral cephalograph using the classification of Hassel and Farman. The stage of the permanent maxillary canine eruption has been investigated on the orthopantomographs depending on its vertical height in relation to the adjacent incisor. Descriptive statistics were obtained for both CVMI stages and canine eruption grading. Spearman rank correlation test was used to determine the correlation between both methods. The minimum level of significance was considered less than 0.05 (P < 0.05). Results: Results showed a strong correlation between CVMI and the grading of the maxillary canine eruption in both female and male and the (r) value estimated was 0.862 and 0.758, respectively. Over 90% of deceleration stage of CVMI in both genders show canine eruption (pubertal growth spurt) about 91.66% for female and 95.65% for male and a small percentage of delay eruption 8.33% and 4.35% in female and male gender, respectively, with a predilection to the female gender. Conclusions: A significant correlation between the permanent maxillary canine eruption stages and skeletal maturity was found. The eruption of maxillary canine occurs before the end of pubertal growth. Any delay in the eruption of maxillary canine after the deceleration stage of CVMI, suggesting a chance of impaction.


Asunto(s)
Determinación de la Edad por el Esqueleto , Erupción Dental , Cefalometría , Diente Canino/diagnóstico por imagen , Femenino , Masculino , Maxilar , Radiografía Panorámica
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