Clinical assessment of pterygoid and anterior implants in the atrophic edentulous maxilla: a retrospective study / 华西口腔医学杂志

OBJECTIVES@#This study aims to evaluate the short-term clinical outcomes and patient satisfaction of anterior and pterygoid implants in the rehabilitation of edentulous maxilla with posterior atrophy.@*METHODS@#Given a minimum follow-up of 1 year, 25 patients with fixed maxillary rehabilitation over anterior and pterygoid implants were enrolled in this retrospective study. The implant survival rates, peri-implant soft tissue status (including probing depth, modified sulcus bleeding index, and plaque index), marginal bone loss, and patient satisfaction were measured.@*RESULTS@#The survival rates for anterior and pterygoid implants at 1-year follow-up were 96.5% and 97.8%, respectively (@*CONCLUSIONS@#For the edentulous maxilla with posterior atrophy, full-arch fixed prostheses supported by anterior and pterygoid implants has an acceptable short-term clinical outcome and excellent patient satisfaction. It may be considered as a predictable and feasible method for maxillary rehabilitation.

Validation of the digital integration technology for evaluating the nasolabial morphology variation after the cross-arch fixed restoration of maxillary implant-supported prostheses / 北京大学学报(医学版)

OBJECTIVE@#To explore the applicability of integration between three-dimensional (3D) facial and dental data to evaluate the nasolabial morphology variation before and after the cross-arch fixed restoration of the maxillary implant-supported prostheses.@*METHODS@#Twelve patients (4 women and 8 men), mean age (54.82±5.50) years (from 45 to 62 years) referred to the Department of Oral Implan-tology, Peking University School and Hospital of Stomatology, were selected and diagnosed with edentulous maxilla. For all the patients, 4 to 6 implants were inserted into the maxilla. Six months later, the final cross-arch fixed prostheses were delivered. The 3D facial images were collected before and after the final restoration. The 3D data of prostheses were also captured. All the 3D data were registered and measured in the same coordinate system. Then the displacement of all the landmarks [cheilion left (CHL), cheilion right (CHR), crista philtri left (CPHL), crista philtri right (CPHR), labrale supe-rius (LS), subnasale (SN), stomion (STO), upper incisor (UI), upper flange border of the prostheses (F-point, F)], and the variation of the distances between these landmarks (SN-LS, CPHR-CPHL, CHR-CHL, LS-STO) were analyzed and compared.@*RESULTS@#The consistency test among three measurements of the length of F-SN indicated that the integration method of the dental prostheses and soft tissue had the good repetitiveness, ICC=0.983 (95%CI: 0.957-0.995). After wearing the final cross-arch maxillary implant-supported prostheses, all the landmarks on the soft tissue moved forward. The nasal base area changed minimally, and the shift of SN in the sagittal direction was only (0.61±0.44) mm. But the sagittal shift of LS was (3.12±1.38) mm. In the vertical direction, SN, LS, CPHL, and CPHR moved upward. But STO, CHL, and CHR moved downward a little. Except for the slight decrease of the length of philtrum (SN-LS), the length of CHL-CHR, CPHL-CPHR, and the height of upper lip were increased together (P < 0.01). In the direction of Z axis, the strong correlations were found not only between the movements of SN and F (r=0.904 3) but also between the movements of LS and UI (r=0.958 4).@*CONCLUSION@#The integration method of 3D facial and dental data showed good repetitiveness. And the strong correlations between the landmarks of prostheses and nasolabial soft tissue in the sagittal direction were found by this new method.

Clinical and radiographic evaluation of implant-supported mandibular overdentures subjected to immediate loading: a 36-month follow-up / Evaluación clínica y radiográfica de implantes rehabilitados con sobredentaduras mandibulares y sometidos a carga inmediata: 36 meses de observación

ABSTRACT. Introduction: the aim of this study was to clinically and radiographically evaluate 54 implant-supported mandibular overdentures under the protocol of immediate loading, using a retention system with ball attachments. This evaluation was performed within 36 months of function of the implants. Methods: observational descriptive study in 27 fully edentulous patients who were evaluated in a 36-months follow-up period, after having two internal connection implants placed in the interforaminal area of the lower maxilla. The implants were evaluated in terms of survival rate, amount of peri-implant bone loss, condition of peri-implant tissues, prosthesis behavior, and degree of patient satisfaction. Results: survival rate at 36 months was 98.1% and the average radiographic bone loss was 0.45 mm (SD 0.6); there was a low level of plaque and average probing depth was 1.75 ± 0.75 mm. 57% of prosthesis showed active retention. 43% did not show retention or it was provided by one of its elements. 53.8% of overdentures were stable. A high percentage of patients showed total satisfaction. Conclusion: in a 36-months follow-up, a mandibular overdenture with ball attachments placed on two non-splinted implants immediately loaded is a predictable treatment in patients with fully edentulous lower maxilla, with high implant survival rates, low levels of peri-implant bone loss, and a high degree of patient satisfaction.

RESUMEN Introducción: el objetivo de este estudio consistió en evaluar clínica y radiográficamente, después de 36 meses de función, 54 implantes colocados en el maxilar inferior y rehabilitados con sobredentaduras bajo el protocolo de carga inmediata, utilizando un sistema de retención tipo bola. Métodos: estudio observacional descriptivo que consideró 27 pacientes totalmente desdentados que fueron evaluados en un seguimiento a 36 meses, luego de haber recibido cada uno dos implantes de conexión interna, instalados en la región interforaminal del maxilar inferior. Los implantes fueron evaluados en términos de supervivencia, cantidad de pérdida ósea periimplantar, estado de los tejidos periimplantares, comportamiento de la prótesis y grado de satisfacción de los pacientes. Resultados: la tasa de supervivencia a los 36 meses fue de 98,1%, el promedio de pérdida ósea radiográfica fue de 0,45 mm (DE 0,6); se presentó un nivel de placa bajo y el promedio de profundidad al sondaje fue de 1,75 ± 0,75 mm. El 57% de las prótesis presentaron retención activa. El 43% no presentó retención, o su retención estaba dada por uno solo de sus elementos. El 53,8% de las sobredentaduras se encontraron estables. Un alto porcentaje de los pacientes manifestaron satisfacción total. Conclusión: a 36 meses de observación, una sobredentadura mandibular retenida por pilares en bola colocada sobre dos implantes no ferulizados y cargados inmediatamente es un tratamiento predecible en pacientes con desdentación total inferior, con una alta tasa de supervivencia de los implantes, bajos niveles de pérdida ósea periimplantar y alto grado de satisfacción de los pacientes.

Implantes cigomáticos en pacientes con edentulismo maxilar y reabsorción ósea severa / Zygomatic implants in patients with maxillary edentulism and severe bone resorption

El tratamiento con implantes convencionales no puede hacer parte de la rehabilitación implantosoportada en maxilares edéntulos totales en algunos pacientes, debido a la resorción ósea avanzada o por neumatización del seno maxilar, lo que conduce a cantidades inadecuadas de tejido óseo para el anclaje de los implantes. Durante más de tres décadas, técnicas quirúrgicas para colocación de injertos óseos antes o simultáneamente con la colocación del implante se ha convertido en la rutina en rehabilitación oral. Diversas técnicas de aumento óseo, como la elevación de seno maxilar o injerto óseo, se han descrito con el objetivo común de aumentar el volumen de hueso de soporte. Actualmente con el desarrollo de la técnica en implantes cigomáticos se pueden evitar estas técnicas de injertos óseos devolviendo a los pacientes mejor calidad de vida y estética adecuada con un trauma menor y facilitando el tratamiento y el pronóstico del mismo.

Treatment with conventional implants can not be part of the implant rehabilitation in edentulous jaws in some patients due to advanced bone resorption or sinus neumatization, which leads to inadequate amounts of bone to anchor the implants. For over three decades, surgical placement of bone prior to or simultaneously with implant placement grafting techniques has become routine in oral rehabilitation. Several bone augmentation techniques such as sinus lift or bone graft, have been reported with the common goal of increasing the volume of load bearing bone. Now with the development of technology in zygomatic implants can prevent these bone graft techniques returning patients better quality of life and appropriate aesthetics. With less trauma and facilitating the treatment and prognosis of it.

Success rate of zygomatic implants forrehabilitation of severely atrophied maxillae: a review of the literature / Tasa de éxito de los implantes cigomáticos para la rehabilitacióndel maxilar severamente atrofiado: una revisión de la literatura

Severe resorption in the posterior maxilla sectors as a result of tooth loss along with the process of pneumatization of the maxillary sinus, difficult the prosthetic rehabilitation supported by conventional implants due to the shortage of vertical bone availability. So that over the years they have designed therapeutic alternatives to help overcome these drawbacks. The zygomatic implant was introduced in 1988 by Branemark. This implant has a design which allows it to be positioned over the ridge to the height of the first molar, reducing vestibular cantilever up to 20 percent and reducing complications of peri-implant inflammation, infection and gingival hyperplasia, which may lead to perforation horizontal process of the palatine bone. The purpose of this review is to determine the success rate of zygomatic implants for rehabilitation of severely atrophied maxillae. A total of 1410 zygomatic implants and 1673 Traditional implants were included in selected articles. Of these 1410 zygomatic Implants, 365 were conventional loading and 1045 were immediately and early loading, these had a success rate of 98.3 percent and 98.7 percent, respectively. Of these 1673 Traditional Implants, 463 were conventional loading and 1210 were immediately and early loading, they had a success rate of 93.9 percent and 97.8 percent, respectively. The overall success rate of zygomatic implants and Conventional implants was 98.6 percent and 96.8 percent, respectively. The rehabilitation of severely atrophied maxilla with fixed prosthesis immediately and conventional loaded by zygomatic implants gives excellent results in the medium term. When comparing traditional treatment modalities, proposals for prosthetic reconstruction of severely atrophied maxilla, the zygomatico implant has the highest success rate over conventional treatments...

La reabsorción severa en sectores posteriores del maxilar, como resultado de la pérdida de dientes junto con el proceso de neumatización del seno maxilar, resulta en una difícil rehabilitación protésica conel apoyo de los implantes convencionales, debido a la escasez de hueso vertical disponible. A lo largo de los años se han diseñado alternativas terapéuticas para ayudar a superar estos inconvenientes. El implante cigomático fue introducido en 1988 por Branemark. Este implante tiene un diseño que permite colocarse sobre la cresta hasta la altura del primer molar, reduciendo el voladizo bucal hasta en un 20 %, con la consecuente reducción de las complicaciones del peri-implantarias, como inflamación, infección y la hiperplasia gingival, que pueden conducir al desarrollo del proceso de perforación horizontal del hueso palatino. El propósito de esta revisión fue determinar la tasa de éxito de los implantes cigomáticos para la rehabilitación del maxilar gravemente atrófico. Un total de 1410 implantes cigomáticos y 1673 implantes tradicionales fueron descritos en los artículos seleccionados. De estos 1410 implantes cigomáticos, 365 eran de carga convencional y 1045 fueron de carga inmediata y temprana, teniendo una tasa de éxito del 98,3 % y 98,7 %, respectivamente. De los 1673 implantes tradicionales, 463 fueron de carga convencional y 1210 fueron de carga inmediata y temprana, presentando una tasa de éxito del 93,9 % y 97,8 %, respectivamente. La tasa de éxito de los implantes cigomáticos y los implantes convencionales fue del 98,6 % y 96,8 %, respectivamente. La rehabilitación del maxilar severamente atrofiado con prótesis fija convencional cargado inmediatamente y por los implantes cigomáticos otorgó excelentes resultados en el mediano plazo. Al comparar las modalidades de tratamiento tradicionales, propuestas para la re-construcción protésica del maxilar severamente atrofiado, el implante cigomático tiene la mayor tasa de éxito respecto a los tratamientos convencionales.

A conversion to implant overdenture in failed fixed implant prosthesis of edentulous maxilla: A case report / 대한치과보철학회지

Fixed implant prosthesis and removable implant overdenture are the main treatment options for treating edentulous maxilla with implants. If clinicians select one of the treatment options without accurate diagnosis and evaluation, this may lead to unfavorable treatment result and one would not be able to guarantee successful long term prognosis. In this case, 69 year-old female presented with failed fixed implant prosthesis that was treated in private dental clinic. Since the patient did not want additional insertion of implants and considering factors such as oral hygiene maintenance, splinting effect, and esthetics, the patient was treated with removable implant bar type overdenture using pre-existing implants. The clinical results were satisfactory in the aspect of esthetics and masticatory function, oral hygiene maintenance.

Implant supported fixed prosthesis for complete edentulous maxilla with severe alveolar ridge resorption: A case report / 대한치과보철학회지

Implant fixed prosthesis for the complete edentulous maxilla provides significant benefits in the aspects of functions and esthetics compared with the conventional denture. Implant supported fixed prosthesis are totally supported by implant, and thus stabilizes the prosthesis to the maximum degree as possible. Also, the improved retention and stability of fixed prosthesis enhance patients' psychological and psychosocial health. This clinical presentation describes a maxillary full arch implant-supported fixed prosthesis in complete maxillary edentulous patient who showed vertical and horizontal alveolar bone resorption in the anterior ridge. To rehabilitate the esthetics and proper lip support, the zirconia framework was fabricated and the pink porcelain was veneered to reproduce the natural gingival tissue. After 9 months of follow up, the restorations were maintained without complications and the patient was satisfied with the restoration both functionally and esthetically.

Maxillary Full Arch Fixed Prosthesis: Clinical Laboratory Procedures and Rehabilitation with Milled Titanium Prosthesis.

Maxillary teeth are the focal point of human smile. Restoring the edentulous maxilla with implant prosthetics is the most challenging area in implant dentistry. Several techniques have been described for the successful restoration of the edentulous mandible/maxilla. Fixed-detachable prostheses with either hybrid prosthesis design or conventional implant supported fixed partial dentures and implant-retained/supported over dentures are some examples. A clinical report is presented describing the clinical and laboratory procedures involved in the fabrication of a copy milled fixed full arch maxillary prosthesis. Similar procedures may be followed in the making of a fixed full arch copy milled mandibular prosthesis.

Análise crítica com TCFC da altura e espessura em sítios maxilares edêntulos potenciais para implantes dentários, usando-se a técnica all-on-four: estudo piloto / A critical CBCT analysis of height and thickness in edentulous maxillary potential implant sites regarding the all-on-four technique: pilot study

A técnica da cirurgia guiada sem retalho representa um grande avanço tecnológico, e é considerada uma realidade na Osseointegração. Sendo assim, a sua execução deve seguir alguns cuidados para o sucesso no tratamento proposto, no que tange alguns aspectos essenciais, a exemplo da disponibilidade óssea mínima para correta instalação dos implantes. Portanto, foi realizado um estudo tomográfico com amostra de 20 maxilas totalmente edêntulas para avaliar a viabilidade da instalação virtual de implantes no software Dental Slice, de acordo com a disponibilidade óssea, seguindo o protocolo all-on-four, além de mensurar nos cortes tomográficos a altura e a espessura dos sítios de instalação dos implantes. Os resultados encontrados de acordo com a análise estatística foram: 5% das maxilas estudadas apresentaram disponibilidade suficiente para a inserção completa dos quatro implantes no osso remanescente; 95% das maxilas apresentaram áreas de fenestrações ou ausência completa de possibilidade de inserção. Nos 80 sítios de instalação de implantes mensurados foram encontradas médias de 8,58 mm (p=0,66) e de 3,52 mm (p=0,85) de altura e de espessura óssea, respectivamente. Os autores concluem que apenas 5% das 20 maxilas estudadas foram consideradas viáveis para a inserção completa de implantes seguindo o protocolo all-on-four...

Guided flapless surgery has proved to be a major breakthrough in the practice of Implantodontics, but certain precautions should be taken in the execution of this technique, particularly with respect to the minimum availability of bone required for the successful implant placement. With this in mind, a tomographic study of 20 completely edentulous maxillae was carried out using Dental Slice software, to measure the bone height and thickness of potential implant insertion sites and evaluate the viability of installing implants following an ‘All-on-four’ protocol. A total of 80 sites were evaluated and a mean height of 8.58mm (p= 0.66) and a mean thickness of 3.52 mm (p= 0.85) were recorded. Statistical analysis of the results showed that only 5% of the maxillae studied had suffi cient remaining bone for the complete insertion of four implants, while 95% either presented areas of fenestration or were completely inadequate for implant placement. It was concluded that complete implant insertion following an ‘All-on-four’ protocol was viable in only 5% of studied cases...

The management of a complex implant case using CAD-CAM technology: A clinical report / 대한치과보철학회지

PURPOSE: The application of computer-aided technology to implant dentistry has created new opportunities for treatment planning, surgery and prosthodontic treatment, but the correct selection and combination of available methods may be challenging in times. Hence, the purpose of this case report is to present a combination of several computer-aided tools as approaches to manage complicated implant case. MATERIAL AND METHODS: A 47 year-old female patient with severe dental anxiety, high expectations, financial restrictions and poor compliance presented for a fixed rehabilitation. A CT scan with a radiographic template obtained with software (SimPlant, Materialize, Leuven, Belgium) was used for treatment planning. The surgical plan was created and converted into a stereolithographic model of the maxilla with bone-supported surgical templates (SurgiGuide, Materialise, Leuven, Belgium), that allowed for the precise placement of 7 implants in a severely resorbed edentulous maxilla. After successful osseointegration, an accurate scan model served as the basis for the fabrication of a one-piece milled titanium framework using the Procera (Nobel Biocare, Gothenburg, Sweden) technology. The final rehabilitation of the edentulous maxilla was rendered in the form of a screw-retained maxillary metal-reinforced resin-based complete prosthesis. RESULTS: Despite challenging circumstances, 7 implants could be placed without bone augmentation in a severely resorbed maxilla using the SimPlant software for pre-implant analysis and the SurgiGuide-system as the surgical template. The patient was successfully restored with a fixed full arch restoration, utilizing the Procera system for the fabrication of a milled titanium framework.