ABSTRACT
@#The crown-root ratio (C/R) theory of natural teeth has been widely recognized in the field of stomatology,and has important clinical significance in predicting and assessing the prognosis of natural teeth as well as for abutment selection during denture restoration. In the past few decades, scholars have advocated for the implantation of implants as long in length as possible to improve the success rate according to the theory of crown-root ratio of natural teeth. However, with the application of short implants, our philosophy of implantation has changed, and the relationship between the crown-implant (C/I) ratio and complications has become one of the current research hotspots. In this paper, the concept of the crown-implant ratio, the research progress of the C/I ratio, the implant survival rate and clinical complications of implant restoration were reviewed and summarized, and the following suggestions were put forward: although most studies have shown no significant correlation between the C/I ratio and implant survival or marginal bone loss, this relationship may increase the risk of mechanical complications. A C/I < 3 and a crown length < 15 mm are recommended in implant restoration; when ultra-short implants are applied, the implant system can increase the bone-to-implant contact area, and splint prostheses such as crown or bridge are recommended.
ABSTRACT
Objective@# To evaluate the clinical effects of full-arch cement-retained implant-supported combined crowns and screw-retained implant-supported bridge dentures in complete or half edentulous patients. @*Methods @#A total of 25 patients with complete or partial edentulous dentures followed up for 1, 3, and 5 years in our hospital from June 2013 to June 2018 and were treated with Straumann bone horizontal implantation, cobalt-chromium stenting and cobalt-chromium porcelain restoration with cement-retained and screw-retained implant-supported fixed dental prostheses to evaluate the accumulative implant survival rate, accumulative prosthesis survival rate, mechanical complications, and biological complications in both groups. @*Results @#There were 25 complete or half edentulous patients who received 165 Straumann implants and 28 implant-supported fixed dental prostheses in this study. There were 11 cases with 69 implants in the cement group and 17 cases with 96 implants in the screw group. The accumulative implant survival rate was 100% in the cement group and 96.9% in the screw group. The accumulative prosthesis survival rate was 100% in both groups. The cumulative peri-implant mucositis rate was 23.2% in the cement group and 29.2% in the screw group, and the peri-implantitis rate was 6.8% in the cement group and 7.3% in the screw group. There was 1 case of porcelain collapse (n=1/11) and no screw of abutment loosening in the cement group and 4 cases of porcelain collapse (n=4/17) and 1 case of screw loosening in the screw group. No fracture of abutment was observed in either group. There was no difference in bone loss between the two groups in the first year (P > 0.05), and a higher rate of bone loss was found in the screw group in the third and fifth years (P < 0.05). There was no difference in the sulcus bleeding index(mSBI) between the two groups in the first year and the third year (P > 0.05) and a higher modified mSBI value in the cement group in the fifth year (P < 0.05).@*Conclusion @#The survival rates of the implant and prosthesis for cement-retained or screw-retained implant-supported fixed dental prostheses were both high, but there were more mechanical and biological complications in the traditional cobalt-chromium alloy screw-retainer group. The removal of residual adhesives must be reasonably considered when choosing the cement retention method.
ABSTRACT
El objetivo de esta investigación fue determinar la condición periodontal en prótesis fijas singulares (PFS) realizadas en la clínica odontológica Integral del Adulto I y II de la Universidad Mayor de Temuco entre los años 2007 y 2009. Se evaluaron 73 PFS mediante un examen clínico, realizadas en 41 pacientes. Se analizaron las variables: edad, sexo, pieza dentaria, año de atención, año académico en que se realizaron las PFS, material de las prótesis fijas; los parámetros periodontales evaluados en este estudio fueron edema y eritema, sangramiento y recesión gingival. La frecuencia de edema y eritema fue de 81 por ciento, el sangramiento lo encontramos en un 77 por ciento y la recesión gingival en un 27 por ciento. Las mujeres presentaron mayores problemas de los tejidos periodontales con un 85 por ciento de edema y eritema y un 81 por ciento de sangramiento. Las PFS realizadas en el 4to año académico presentaron un 55 por ciento de recesión gingival y las realizadas en el 5to año mostraron un 17 por ciento. En relación al año de atención en el que se realizaron las rehabilitaciones, las PFS realizadas en el año 2007 presentaron un 100 por ciento de inflamación, mientras que en los otros años (2008 y 2009) las PFS presentaron menos daño a nivel gingival. Las piezas más afectadas según la ubicación en la boca, fueron las posteriores con un 84 por ciento de edema y eritema. Respecto al material, las PFS que presentaron más problemas de edema y eritema fueron las de metal cerámica con un 82 por ciento. Del total de los 41 pacientes observados, la mayoría estaban satisfechos con su rehabilitación. Finalmente se puede concluir que no existió evidencia estadísticamente significativa para concluir que existe una asociación entre las variables edad, sexo, año de atención y las variables edema y eritema, sangramiento y recesión gingival. En cambio, si se encontró evidencia estadísticamente significativa entre el cuarto y quinto año académico/ durante el tiempo/...
The aim of this study was to determine the periodontal condition in fixed single prostheses made at Integral Adult Dental Clinic I and II of the Universidad Mayor in Temuco, between the years 2007 and 2009. Seventy-three fixed single prostheses were evaluated by clinical examination, made in 41 patients. Variables were analyzed: age, sex, tooth, year of care, year in which the fixed single prostheses were made, fixed single prostheses material; periodontal parameters evaluated in this study were edema and erythema, bleeding and gingival recession. Edema and erythema's frequency were 81 percent, bleeding in 77 percent and gingival recession in 27 percent. Women presented major problems in periodontal tissues with 85 percent of edema and erythema and 81 percent of bleeding. Fixed single prostheses made in 4th year showed 55 percent of gingival recession and the ones that were made in 5th year showed 17 percent. In relation to the year of care in which the rehabilitations were made, the fixed single prostheses made in 2007 showed 100 percent of inflammation, while in the other years (2008 and 2009) the fixed single prostheses showed less damage at gingival level. The most affected teeth according to the location in the mouth were the back ones with 84 percent of edema and erythema. Regarding material, the fixed single prostheses that showed more edema and erythema problems were the metal-ceramics with 82 percent. Of the total of the 41 patients observed, the majority was satisfied with their rehabilitation. Finally we can conclude that there was no statistically significant evidence to conclude that there is an association between the variables age, sex, year of care and the variables edema and erythema, bleeding and gingival recession. In contrast, if found statistically significant evidence between the 4th and 5th year/ during the time/ years in which the fixed single prostheses and the gingival recession were made.
Subject(s)
Humans , Male , Female , Adult , Middle Aged , Denture, Partial, Fixed , Periodontal Index , Cross-Sectional Studies , Crowns , Denture, Partial, Fixed/adverse effects , Edema/etiology , Erythema/etiology , Gingival Hemorrhage , Metal Ceramic Alloys , Patient Satisfaction , Gingival Recession/etiology , Treatment OutcomeABSTRACT
Las restauraciones con implantes dentales oseointegrados cada vez se utilizan con mayor frecuencia. Este tipo de restauraciones han mostrado un alto porcentaje de éxito. Sin embargo, las mismas pueden presentar complicaciones. Las complicaciones biológicas pueden poner en riesgo nuestro tratamiento restaurador, por tanto debemos estar en capacidad de diagnosticar las diferentes condiciones periimplantares y referir al especialista en el área cuando sea necesario. También, debemos prevenir la ocurrencia de las complicaciones y educar al paciente para que realice un mantenimiento correcto de las restauraciones implantosoportadas
Osseintegrated dental implants restorations are being used more frequently over the years. These restorations have shown high success rate. However, they may have biological complications, which could jeopardize the restorative's treatment. Therefore, dentists must be able to diagnose different periimplantals conditions and refer it to specialists in the area, when is required. Although, dentist must prevent the appearance of complications and educating their patients on the correct maintenance of implant-supported restorations