Measurement of buccolingual inclination of posterior teeth and the curve of Wilson in patients with different sagittal skeletal patterns using cone-beam computed tomography / 口腔疾病防治

Objective@# To study the buccolingual inclination of posterior premolars and molars and the curve of Wilson in patients with different sagittal skeletal patterns, to explore the compensation mechanism of horizontal inclination of posterior teeth in patients with different sagittal skeletal patterns and to provide a reference for the control of posterior tooth inclination in the treatment of bone malocclusion.@*Methods@#This study was reviewed and approved by the Ethics Committee, and informed consent was obtained from the patients. Ninety CBCT scans of adults and ninety scans of adolescents before orthodontic treatment were evaluated in this cross-sectional study. There were 30 skeletal Class I, Class Ⅱ, and Class Ⅲ patients in the adult group and adolescent group. The inclination angles of posterior teeth and the curve of Wilson of first and second molars were measured, and data were analyzed between adolescents and adults with different sagittal skeletal patterns.@*Results @#Compared with skeletal Class Ⅰ adult patients, the upper posterior molar inclination of skeletal Class Ⅱ patients was significantly lower, and the lower posterior molar inclination was significantly higher. Compared with skeletal ClassⅠ adult patients, the upper posterior molar inclination of skeletal Class Ⅲ adult patients was higher, and the lower posterior molar inclination was significantly lower. The Wilson curve of the second molar in skeletal Class Ⅱ adult patients was significantly higher than that in the other groups. Compared with skeletal ClassⅠ adolescent patients, skeletal Class Ⅲ adolescent patients had a significantly higher upper posterior molar inclination; however, no difference was found between the inclination of the posterior teeth between skeletal Class Ⅰ, Class Ⅱ and Class Ⅲ adolescent patients. Comparing adolescent and adult samples, in skeletal Class Ⅱ patients, adults showed more lingual inclination than adolescents in the upper posterior teeth and less lingual inclination in the lower posterior teeth except for the mandibular first molar. Comparing adolescent and adult samples, in skeletal Class Ⅲ patients, adults showed more lingual inclination than adolescents in the lower posterior teeth except for the mandibular second molars and showed no difference in the upper posterior teeth.@*Conclusions@#The inclination of the posterior teeth and the curve of Wilson show significant differences between the three sagittal skeletal patterns. Compared with those of skeletal Class Ⅰ patients, the posterior teeth of skeletal Class Ⅱ patients show more lingual inclination in the upper arch and less lingual inclination in the lower arch. Meanwhile, posterior teeth of skeletal Class Ⅲ patients show more lingual inclination in the lower arch and maintain the inclination in the upper arch.

Analysis of factors related to early failure of 1 001 implants with 3.3 mm narrow-diameter / 口腔疾病防治

Objective@# To explore the early failure of narrow-diameter implants (NDIs) and to provide a reference for clinical implant restoration.@*Methods@# From April 2017 to April 2020, data from a total of 725 patients (with 1 001 NDIs) who accepted implant restoration due to dentition defects were collected from the department of dental implantology in a stomatological hospital; 353 males and 372 females were included. The early failure rate of 1 001 NDIs was retrospectively analyzed. Univariate generalized estimated equation (GEE) and multivariate GEE were used to explore risk factors, including age, sex, implant location, materials, surface modification, length, bone augmentation and healing procedure, associated with early failure of NDIs.@*Results@#There were 34 cases of early failure among 725 patients, including 38 NDIs. The early failure rate of NDIs was 4.69% at the patient level and 3.80% at the implant level. There was no significant difference in the early failure rate of NDIs among different age groups, sexes, implant materials, surface modifications, lengths, and healing procedures (P>0.05). Univariate analysis showed that there was a significant difference between the early failure rate of NDIs in the anterior maxilla group (2.16%) and the anterior mandible group (8.64%) at the implant level (P<0.001). However, there was no significant difference in the early failure rate between the anterior maxilla group and the posterior group (3.35%) (P>0.05). In addition, in the anterior region, the early failure rate of NDIs in the group with simultaneous bone augmentation was significantly lower than that of the group without bone augmentation (P<0.05). However, multivariate GEE analysis showed that the early failure rate of NDIs was only significantly positively correlated with implants in the mandibular anterior region (P<0.01). @*Conclusion @#The overall early survival rate of Straumann 3.3 mm NDIs is greater than 95%. The early failure of NDIs in the anterior mandible region is much higher than that in the anterior maxilla region and posterior region.

Comparison of diagnosing the relationship between the root of maxillary posterior tooth and maxillary sinus between panoramic radiography and cone beam computer tomography / 口腔疾病防治

Objective@#To study the diagnostic accuracy and the distance between the root of maxillary posterior tooth and the maxillary sinus using panoramic radiography and cone beam computer tomography; to provide basic information for clinicians to treat diseases in the maxillary posterior region. @* Methods@#Eighty patients were included in this study. A total of 671 specimens were measured for the distance between the root tip and the maxillary sinus floor in both imaging modalities.@*Results @#The roots that did not contact the sinus floor or contacted but did not project into the sinus cavity showed an agreement of 82% and 70% when using panoramic radiography. Forty-eight percent of the roots that projected into the sinus cavity in panoramic radiography showed protrusion into the sinus with cone beam computer tomography (CBCT). For panoramic radiography and CBCT showing root projections into the sinus cavity, the average distances were 2.19 ± 1.82 mm and 1.47 ± 1.01 mm, respectively. There was a significant difference between the two values (P ＜ 0.05).@*Conclusion@# Panoramic radiography is more accurate when roots of maxillary posterior teeth do not contact the sinus floor or contact it. However, it has a lower accuracy rate when the tooth roots protrude into the sinus.

Técnica bulk-fill comparada con técnica incremental para restauraciones posteriores en pacientes con dentición permanente / Bulk-fill technique versus conventional resin composite for posterior restorations in permanent teeth

RESUMEN: Introducción: Las restauraciones en el sector posterior son generalmente manejadas mediante el uso de resinas convencionales con técnica incremental. Debido a diversas limitaciones de la técnica convencional, la técnica bulk-fill ha ganado relevancia en la práctica clínica. Este resumen tiene como objetivo evaluar la efectividad de ambas técnicas al momento de realizar restauraciones clase I y clase II de Black en dientes posteriores permanentes. Métodos: Realizamos una búsqueda en Epistemonikos, la mayor base de datos de revisiones sistemáticas en salud, la cual es mantenida mediante el cribado de múltiples fuentes de información, incluyendo MEDLINE, EMBASE, Cochrane, entre otras. Extrajimos los datos desde las revisiones identificadas, analizamos los datos de los estudios primarios, realizamos un metanálisis y preparamos una tabla de resumen de los resultados utilizando el método GRADE. Resultados y conclusiones: Identificamos cinco revisiones sistemáticas que en conjunto incluyeron 15 estudios primarios, todos correspondientes a ensayos aleatorizados. Concluimos que la técnica bulk-fill podría aumentar levemente el fracaso de la restauración a mediano plazo, podría resultar en poca o nula diferencia en el fracaso de la restauración a largo plazo y podría resultar en poca o nula diferencia en el desarrollo de caries secundaria, pero la certeza de la evidencia es baja. La técnica bulk-fill probablemente resulta en poca o nula diferencia en el riesgo de sensibilidad postoperatoria.

ABSTRACT: Introduction: Conventional resin composite has been widely used in the restoration of posterior teeth. However, due to its limitations, the bulk-fill technique has been adopted by clinicians. This evidence summary aims to evaluate the effectiveness of both techniques for class I and II restorations in permanent posterior teeth. Methods: We searched in Epistemonikos, the largest database of systematic reviews in health, which is maintained by screening multiple information sources, including MEDLINE, EMBASE, Cochrane, among others. We extracted data from the systematic reviews, reanalyzed data of primary studies, conducted a meta-analysis and generated a summary of findings table using the GRADE approach. Results and conclusions: We identified five systematic reviews including fifteen studies overall, of which all were randomized trials. We conclude that bulk-fill technique may slightly improve the risk of medium-term restoration failure, may make little or no difference to long-term restoration failure and may make little or no difference to secondary caries but the certainty of the evidence has been assessed as low. Finally, bulk-fill technique probably makes little or no difference to postoperative sensibility.

Study of mandibular buccal gingival mucosa pain sensitivity / 口腔疾病防治

Objective@# Through a pain study of buccal gingival mucosa sensitivity of the mandible, the corresponding sensitive area of pain was determined, which provided the basis for reducing the pain and discomfort of oral diagnosis and treatment.@*Methods@#400 patients with mandibular tooth extraction in the outpatient department of stomatology were selected. During tooth extraction, articaine epinephrine injection was used for infiltration anesthesia. The injection needle size was 0.3 mm × 21 mm, and the injection site was about 5 mm away from the buccal gingival margin. The pain degree of the patients was recorded. The data were statistically analyzed using the modified International pain classification method.@*Results @#Among the 400 patients who underwent mandible extraction, 75% (300 patients) graded their pain from painless to moderate, and 25% (100 patients) reported moderate to severe and severe pain. Of those in the moderate to severe and severe groups, 50% and 42% reported pain in the central and lateral incisors, respectively, and 38% were in the canine group. When comparing the moderate to severe and the severe groups, 16% and 10% were in the bicuspid group, 16% and 12% and 16% were in the molar group, respectively . There were significant differences in the pain sensitivity of different teeth positions (χ2=54.203, P < 0.001). The proportion of moderate to severe and severe pain in the anterior teeth group was higher than it was in the posterior teeth group (χ2=55.555, P < 0.001). There were significant differences in the pain sensitivity of different ages (χ2=96.501, P=0.000), and there was a positive correlation between pain and age (r=0.465, P < 0.001). The proportion of women with at least a moderate degree of pain was higher than that of men (χ2=12.298, P=0.031). @*Conclusion@# The sensitivity of the buccal gingival mucosa to pain is different in different positions of the mandible. The sensitivity of the anterior gingiva is higher than that of the posterior gingiva. Age is positively correlated with the degree of pain. Further, compared with men, women are more sensitive to pain.

Restoration of patient accelerating anterior teeth wear by loss of posterior support: Case report / 대한치과보철학회지

Increased anterior teeth mastication following posterior teeth loss leads to greater anterior occlusal force. It may cause greater attrition of anterior teeth, traumatic force occlusion (TFO), also often followed by antagonist extrusion and occlusal disharmony. This clinical report describes the treatment for a 67-year-old female patient diagnosed with loss of both maxillary and left mandibular posterior teeth, severe attrition of maxillary and mandibular anterior teeth and extrusion of multiple teeth. A diagnostic cast was mounted on articular in centric relation (CR) position to evaluate vertical dimension (VD) and interspace. To provide adequate space for the prosthetic reconstructions, VD was increased by 3 mm on the anterior pin. And then diagnostic wax-up was completed upon that VD. Wax-up was converted to provisional restorations and verified in the patient's mouth and the final restorations were delivered. Clinical follow up examination held 3 months after temporary restoration owing to changes in vertical dimension revealed proper function in mastication without evidence of temporo-mandibular joint (TMJ) disorders. This clinical report presents successfully restoring severe attrition case with increasing vertical dimension resulting in satisfaction in esthetics and function.

Investigation of early marginal bone resorption of different implants in posterior-tooth areas and its influencing factors / 第二军医大学学报

Objective To investigate the state of early marginal bone resorption of different implants in posterior-tooth areas and to explore the related influencing factors. Methods The clinical data were retrospectively analyzed in 96 patients undergoing posterior implant restoration with bone tissue level implants (bone tissue level implant group) and 104 patients with soft tissue level implants (soft tissue level implant group) from Feb. 2013 to Feb. 2016. All patients underwent X-ray examination immediately and at 12 weeks after implantation. With the changes of implants marginal alveolar bone heights as the evaluation basis of early marginal bone resorption, the early mesial and distal marginal bone losses were compared between the two groups. The differences in periodontal health indexes (plaque index [PLI], bleeding index [SBI] and probing depth [PD]) and marginal fitness of implants at 12 weeks after implantation were recorded and analyzed. Pain score (numerical rating scale [NRS]) within 4 weeks after implantation were compared between the two groups. The 200 patients were divided into excellent group (bone resorption1.5 mm) and poor group (bone absorption≥1.5 mm) according to the state of early marginal bone loss. The general data, including age, gender, location of missed teeth, local health of implant, implant diameter, implant length, implanting methods, and smoking, were compared between the two groups. The independent risk factors of early marginal bone resorption of implants were analyzed by logistic regression analysis. Results There were no significant differences in early mesial or distal marginal bone losses, periodontal health indexes (PLI, SBI, or PD) or grade A rate of marginal fitness of implants between the bone tissue level implant group and soft tissue level implant group at 12 weeks after implantation (all P0.05); there was no significant difference in NRS score between the two groups within 4 weeks after implantation (P0.05). The differences in age, gender, location of missed teeth, implant diameter, implant length and other general data were not statistically significant between the excellent group (n＝148) and the poor group (n＝52, all P0.05). Logistic regression analysis showed that non-embedded implanting, poor local health environment of implant and smoking were independent risk factors of early implant marginal bone resorption (all P0.05). Conclusion Bone tissue level implant and soft tissue level implant have similar early marginal bone resorption and high value in posterior-teeth implant restoration. Non-embedded implanting, poor local health environment of implant and smoking are closely related to early marginal bone resorption and need to be taken into account.

Distances between mandibular posterior teeth and the WALA ridge in Peruvians with normal occlusion

ABSTRACT Objective: The purposes of this investigation were to determine the horizontal distances between the mandibular posterior teeth and the WALA ridge in a sample of Peruvians with normal occlusion and to compare them by tooth type, sex, arch side, and age groups. Methods: 65 dental casts of subjects with normal occlusion were collected. Posterior teeth, except for third molars, were evaluated. The horizontal distances between the occluso-gingival midpoints of the buccal surfaces (FA points) of each tooth and the WALA ridge were measured using a modified digital caliper. The values between each different tooth type within the sample were compared using the ANOVA and Scheffe tests, while comparisons by sex, arch side and age groups, using the Student's t-test. Results: The mean distances in the sample was 0.96 mm for first premolars, 1.45 mm for second premolars, 2.12 mm for first molars and 2.55 mm for second molars. Statistically significant differences between each of the four tooth types were found. There were no significant differences found between sex, arch side and age groups. Conclusion: The horizontal distances between the mandibular posterior teeth and the WALA ridge increased progressively from the first premolars to the second molars in Peruvians with normal occlusion. The WALA ridge was a good landmark to evaluate the positions of posterior teeth in Peruvians with normal occlusion.

RESUMO Objetivos: o objetivo dessa investigação foi determinar a distância horizontal entre os dentes posteroinferiores e a borda WALA, em uma amostra de peruanos com oclusão normal, e compará-la por tipo de dente, sexo, lado da arcada dentária e grupo etário. Métodos: foram selecionados 65 modelos dentários de indivíduos com oclusão normal, nos quais foram avaliados os dentes posteriores, com exceção dos terceiros molares. As distâncias horizontais entre o ponto oclusogengival médio da face vestibular (pontos EV) de cada dente e a borda WALA foram medidas utilizando-se um compasso digital modificado. Os testes de Scheffe e ANOVA foram usados para comparações entre os valores de cada tipo de dente estudado, enquanto o teste t de Student foi usado para as comparações entre sexos, lados da arcada e faixa etárias. Resultados: as distâncias médias nessa amostra foram de 0,96 mm para os primeiros pré-molares; 1,45 mm para os segundos pré-molares; 2,12 mm para os primeiros molares, e 2,55 mm para os segundos molares. Foram encontradas diferenças estatisticamente significativas entre cada um dos quatro tipos dentários. Não houve diferenças significativas entre os sexos, lados da arcada e grupos etários. Conclusão: nos peruanos com oclusão normal dessa amostra, as distâncias horizontais entre os dentes posteroinferiores e a borda WALA aumentaram progressivamente dos primeiros pré-molares para os segundos molares. Nesses pacientes, a borda WALA funcionou como um bom ponto de referência para se avaliar a posição dos dentes posteroinferiores.

Clinical application of E-MAX glass ceramic onlays in the restorations of the nonvital posterior teeth / 口腔疾病防治

Objective @# To investigate the clinical use of glass ceramic onlay in the restoration of the non-vital posterior teeth with computer aided design and computer-aided manufacturing technique (CAD/CAM). @*Methods @# 70 patients with 75 teeth of residual crown were selected and restored with CAD/CAM glass-ceramic onlay after completely root canal therapy. Marginal adaptation, anatomic form, adjacent relation, contour appearance, color match were checked in 12-month follow-up. @*Results @# Marginal adaptation, anatomic form, adjacent relation, contour appearance, color match of 73 teeth were satisfactory and 2 cases was excluded because of lost to follow-up. There were no significant differences in the number of cases which met clinical criterion A or B between immediate restoration and 12-month follow-up (P > 0.05), and more than 95% of cases met clinical criterion A.@*Conclusion @#The CAD/CAM glass-ceramic onlay in the restoration of non-vital posterior teeth can provide better effect of retention and esthetics in a short term observation of 12 months.

Symmetrical supernumerary tooth of maxillary posterior area on both sides in adult:A case report / 实用口腔医学杂志

Supernumerary tooth is common,but symmetrical supernumerary tooth on both sides is rare.A case of symmetrical supernumer-ary tooth of maxillary posterior teeth area is reported in this paper.

Clinical evaluation of short fiber ribbon combined with resin bonding technology for the treatment of food impaction between posterior teeth / 实用口腔医学杂志

Objective:To evaluate the clinical effects of short fiber ribbon combined with resin bonding technology for the treatment of food impaction between posterior teeth. Methods:98 cases of vertical food impaction between posterior teeth( total of 135 vertical food impaction units) were included. 73 units were treated by short quartz fiber ribbon combined with resin bonding technology( SQFRB) and 63 by resin bonding(RB). 12, 24 and 36 months after restoration, clinical effects were evaluated referring to the Modified United States Public Health Service (USPHS) Criteria, data were statistically analyzed. Results:12, 24 and 36 months after treatment the cure rate of SQFRB was 97. 3%, 97. 3% and 95. 9%, inefficacy rate was 0, 0 and 0;the cure rate of RB was 85. 5%, 82. 2% and 82. 2%, the inefficacy rate was 4. 8%, 11. 3% and 12. 9%, respectively(between groups, P<0. 05). Conclusion:Minimally inva-sive restorations using short fiber ribbon combined with resin bonding technology is effective in the treatment of vertical food impaction between posterior teeth.

Orthognathic surgery on Skeletal Class III patiens with collapsed vertical dimension: case report

Patients who lost posterior teeth due to periodontitis or dental caries have collapsed vertical dimension, unstable occlusion and change of the mandibular position. In particular, patients in orthognathic surgery, clinician should re-establish the pre-operative stable position of mandibular condyle in articular fossa and favorable vertical dimension for high post-operative stability of mandible. Therefore, interdisciplinary approach and co-operation, including prosthetics, orthodontics, oral and maxillofacial surgeon, from diagnosis and treatment plan is important to get a good outcome. This case report was patients who had collapsed occlusal plane due to severe dental caries on maxillary molars with skeletal Class III malocclusion. Before orthognathic surgery, resetting of maxillary occlusal plane with temporary removable denture was performed. Then successful multidisciplinary approach was done and lead to acceptable clinical outcome.

Frecuencia de restauraciones plásticas directas en dientes posteriores en tres centros públicos de Asunción / Frecuency of direct plastic restorations in posteriorteeth in three public centers in Asunción

En la selección del material de restauración, para rehabilitar una pieza dentaria posterior que ha sufrido una lesión, el operador puede optar entre la amalgama o la resina compuesta, equilibrando las ventajas y desventajas de cada una. Este estudio de enfoque mixto, de diseño descriptivo, retrospectivo y transversal, tuvo como objetivo determinar la frecuencia en el uso de los biomateriales restauradores en dientes posteriores. Se utilizó un cuestionario aplicado a una muestra de 164 sujetos tratados previamente en tres centros póblicos de referencia en Asunción en 2.013 y 2.014. El trabajo se complementó con una técnica cualitativa, la entrevista a grupo focal, en dos grupos distintos; por un lado a docentes y por el otro, a comerciantes de artículos dentales. Se observó que la resina es el material de uso más frecuente (77,7%) seguido del ionómero de vidrio (18,4%), siendo la amalgama el menos utilizado (4,2%). Docentes y comerciantes entrevistados coincidieron en opinar que la resina es el material más utilizado por el factor estético, y que la amalgama se halla francamente en desuso, sea por su falta de estética o por efectos tóxicos, aunque pocos docentes conocían los criterios actuales sobre los efectos adversos de amalgamas y resinas, emitidos por entes sanitarios internacionales. Se propone tener en cuenta estos resultados para la reorientación del curriculum en la educación odontológica respecto a los biomateriales restauradores si fuese necesario, sobre fundamentos válidos y coherentes con las necesidades del contexto.

In selecting restorative material to rehabilitate a posterior tooth that has suffered alesion, the operator can opt between the amalgam and the composite resin, taking theadvantages and disadvantages of each into consideration. This study of mixed approachhad a descriptive, retrospective and transversal design, and the objective of determiningthe frequency of use of restorative biomaterials on posterior teeth. A questionnaire appliedto a sample of 164 subjects previously treated in three referential public centers inAsunción in 2013-and 2014 was used. The study was complemented wit a qualitativetechnique, the Focus Group Interview, applied to two different groups: faculties on onehand and dental articles sellers on the other hand. It was found that resin is the mostfrequently used material (77.7%), followed by glass ionomer (18.4%), with amalgambeing the least used (4.2%). Interviewed faculties and sellers coincided in stating thatresin is the most frequently used material due to the aesthetic factor, and that the amalgam has frankly fallen into disuse whether by its lack of aesthetic or by its toxic effects,though few professors actually knew current criteria about the adverse effects of amalgamsand resins issued by international sanitary entities. It is proposed to take theseresults into account for the reorientation of the curricula in the odontological educationabout restorative biomaterials, if necessary, based on valid grounds, consistent with thecontext needs.

CLINICAL EFFECTS OF DEPRESSING EDENTULOUS AREA WITH MICRO -SCREW IM-PLANT ANCHORAGE COMBINED WITH SEGMENTAL ARCH TECHINIQUE ON POSTERI-OR TEETH IN ELONGATED JAW / 现代医院

Objective To study the application of micro -screw implant anchorage combined with segmental arch technique on posterior teeth in elongated jaw to depress edentulous area.Methods 29 adult patients with 31 posterior teeth were depressed with micro -screw implant as skeletal anchorage combined with segmental arch tech-nique in order to help restoration.Results 31 posterior teeth in the experimental group were successfully depressed to the occlusal plane with micro -screw implant anchorage combined with segmental arch technique in order to create restoration space in edentulous area with an average course of treatment of 10 months.29 posterior teeth in the control group were grinded and given root canal therapy to create restoration space in edentulous area.Conclusion The ap-plication of micro -screw implant anchorage combined with segmental arch technique on posterior teeth in elongated jaw to depress edentulous area is an effective straightening method, whereas grinding is the last resort in creating res-toration space in edentulous area.Because patients in primary hospitals have relatively low oral health awareness, some hope for faster and easier solutions and find it difficult to accept traumatic micro -screw implant.

Onlay restoration using semi-directtechnique: a case report / Restauración onlay usando técnica semi-drirecta conresina compuesta: reporte de un caso

Posterior teeth restorations have changed the contemporary treatment philosophy influencedby the aesthetic demand of patients, progress of adhesive material science and techniques forpreservation and rehabilitation of affected teeth by dental caries and trauma. The development ofOnlay restorations with semi-direct technique in endodonticaly teeth treated aims to preserve theremaining surfaces, to reduce the possibility of fracture and polymerization shrinkage. In addition,better restoration adaptation and marginal seal, resistance to wear and dimensional stability areachieved. This case reports the rehabilitation of an endodontically treated permanent maxillary firstmolar in a 13 years old- patient who attended the Araraquara School of Dentistry, Brazil, using Miris2 Composite resin with semi-direct technique and obtaining an aesthetic and functional restoration ina single appointment. The fundaments and clinical guidelines of the procedure are detailed, based onthe review of the literature that supports this conservative treatment.

La demanda estética por parte de los pacientes es cada vez mayor, igualmente, los avances de la cienciapara obtener mejores materiales y técnicas para la preservación y rehabilitación de dientes afectadospor caries dentaria, trauma, entre otros han logrado revolucionar las restauraciones adhesivaspara dientes posteriores generando un cambio en la filosofía de tratamiento contemporáneo. Laelaboración de restauraciones onlay con técnica semi-directa en dientes tratados endodónticamentebusca conservar la mayor cantidad de superficies remanentes para reducir la probabilidad defractura, disminuir la contracción de polimerización, lograr mejor adaptación y selle marginal, mayorresistencia al desgaste y estabilidad dimensional del material. Este caso reporta la rehabilitaciónde un primer molar superior derecho permanente tratado endodónticamente de un paciente de 13años de edad que asiste a la Facultad de Odontología de Araraquara - UNESP, Brasil, usando resinacompuesta Miris 2 con técnica semi-directa, obteniendo en una sola cita una restauración estéticay funcional. Así mismo, se explican los fundamentos y directrices clínicas para la elaboración de lamisma, teniendo en cuenta la revisión de literatura que apoya este tipo de tratamiento conservador.

Treatment and posttreatment changes following intrusion of maxillary posterior teeth with miniscrew implants for open bite correction / 대한치과교정학회지

OBJECTIVE: This study investigated the skeletal and dentoalveolar changes after intrusion of maxillary posterior teeth using miniscrew implants during the treatment and posttreatment period. METHOD: The subjects consisted of 11 adults (1 male, 10 females) whose open bites were treated by posterior teeth intrusion with miniscrew. The lateral cephalometric x-rays of pre-treatment, post-treatment, and the retention period were evaluated. RESULTS: The average intrusion of maxillary posterior teeth at the end of the treatment period was 2.22 mm (p < 0.001) and the average extrusion of maxillary posterior teeth at the end of the 17.4 month retention period was 0.23 mm (p = 0.359). The relapse rate was calculated at 10.36%. A decrease in overbite after the 17.4 month retention period was 0.99 mm (p < 0.05). The relapse rate was calculated at 18.10%. The skeletal changes and vertical height change of maxillary posterior teeth during the retention period was statistically insignificant, but there was a significant decrease in overbite (mean 0.99 mm, p < 0.05). The amount of intrusion and the overbite improvement from treatment significantly correlates to the degree of relapse. CONCLUSIONS: The results indicate that intrusion of the maxillary posterior teeth using miniscrews is an effective, non-surgical treatment modality which can reasonably be used to address adult open bite.

Surgical orthodontic treatment of skeletal Class III malocclusion using mini-implant: correction of horizontal and vertical dental compensation / 대한치과교정학회지

Treatment of skeletal Class III malocclusion with mini-implant anchorage is discussed in relation to vertical control of the maxillary posterior dentoalveolar region and horizontal control of mandibular anterior teeth. A midpalatal mini-implant provided anchorage for intruding the maxillary posterior teeth. Mandibular mini-implant implants were used to bring about labioversion of mandibular anterior teeth. After mandibular setback surgery, improvement of the facial profile was obtained both horizontally and vertically. Total treatment time was 11 months. Stable occlusion was maintained after 18 months of retention. The effectiveness and efficacy of mini-implants for the treatment of skeletal Class III malocclusion are also discussed.

A comparative study on reliability of the root parallelism of the posterior teeth projected on the orthopantomogram with the 45 degrees oblique cephalogram / 대한치과교정학회지

At present, many orthodontists regard the root parallelism of the posterior teeth important not only in diagnosis and treatment planning but also for predicting posttreatment stability. To evaluate it, they usually refer to the orthopantomogram. At this study, 97 samples were collected from students of Yonsei University, who have well-proportioned face, Angles's class I canine & molar relationships and no crown axis deviation of the posterior teeth including canines. Reliability of the root parallelism observed from orthopantomogram was evaluated by comparison with 45degrees oblique cephalogram. The results were as follows : 1. In comparing the differences between anglular measurements in 45degrees oblique cephalogram & orthopantomogram with 5degrees, those to mandibular plane were significantly less than to occlusal plane in number of items which showed less differences than 5degrees. 2. Compared the root parallelisms in the orthopantomogram with those in 45degrees oblique cephalogram with 1% significance level, parallelism between upper canine & 1st premolar, lower canine & Ist premolar, lower 1st premolar & 2nd premolar, and lower right 2nd molar & 3rd molar showed statistically significant differences. 3. When the significance between the differences of the root parallelism between above two kinds of film and 5degrees was verified by two sided paired t-test, more or less large difference was shown between lower right 2nd molar & 3rd molar, a little larger than 5degrees between lower canine & 1st premolar, smaller at the rest of them. 4. In 45degrees oblique cephalogram, lower canine & 1st premolar showed convergent root arrangements each other, while in orthopantomogram they were divergent each other. All the others except them showed convergency on the upper, divergency on the lower in both films.

A cephalometric study on mesiodistal axial inclination of posterior teeth in open bite and deep bite / 대한치과교정학회지

For the purpose of investigating mesiodistal axial inclination of posterior teeth in normal occlusion group, open bite and deep bite group and investigating the correlationship between the axial inclination of posterior teeth and overbite of anterior teeth, a cephalometric study was performed on the subjects consisted of normal occlusion group(40), open bite group(71 : Angle's Class I 21, Class II, division 1 25, Class III 25) and deep bite group(64 : Angle's Class I 23, Class II, division 1 21, Class III 20). Mesiodistal axial inclination of posterior teeth to occlusal, mandibular and palatal plane were measured. The findings of this study were as follows: 1. Upper and lower posterior teeth were more mesially inclined to occlusal plane in open bite group than in deep bite group. 2. Lower posterior teeth were more mesially inclined in deep bite group than in open bite group in Angle's Class II, division 1 malocclusion but there were no significant differences in Angle's Class I and Class III malocclusion. 3. There was no significant correlationship between the axial inclination of posterior teeth to each plane and overbite of anterior teeth in open bite group. 4. There was a significant correlationship between the axial inclination of upper and lower second premolar to occlusal plane and overbite of anterior teeth in Angle's Class I, Class II, division 1 and Class III malocclusion.