ABSTRACT
Excessive crown-implant ratios have been cited in the literature as being detrimental to long-term implant survival. However, unfavorable crown-implant ratios have not yet been established. The primary aim of this study was to determine the crown-implant ratios of single-tooth implant-supported restorations on short-length implants in a clinical practice, and to evaluate the health of these implants via mesial and distal first bone-to-implant contact levels. Additionally, the relationship between crown-implant ratios and proximal first bone-to-implant contact levels will be evaluated. In this retrospective cohort study, the cohort was composed of 194 patients who possessed at least 1 single 5.7 mm or 6 mm length plateau design implant-supported restoration that had been surgically placed between February 1997 and December 2005. A chart review was performed to acquire the most recent radiographs in which both the entire crown and the implant were visible. The length of the crown and implant was measured directly from the radiographs using consistent magnification to calculate the crown-implant ratio. Mesial and distal first bone-to-implant contact levels were measured using 3 times magnification and were mathematically corrected for distortion. The last available radiograph was used to measure bone levels. Follow-up time was calculated from the day of implant placement to the date of the last available radiograph. Statistical analyses with analysis of variance mixed models were used. Data from 309 single implant-supported fixed restorations were tabulated and included in the study. The mean (SD) follow-up time was 20.9 (23.2) months, with a range of 15.6 to 122.8 months. The mean crown length (SD) was 13.4 (2.6) mm, with a range of 6.2 to 21.7 mm. The mean (SD) crown-implant ratio was 2.0 (0.4) and ranged from 0.9 to 3.2. The average mesial and distal first bone-to-implant contact levels (SD) measured from the radiographs were -0.2 (0.7) mm and -0.2 (0.9) mm, respectively. No statistically significant relationship was observed between increasing crown-implant ratios and decreasing mesial and distal first bone-to-implant contact levels around the implant with P values of .94 and .57, respectively. In this investigation, mesial and distal first bone-to-implant contact levels on short-length implants fall within the established guidelines for success. Also, there are no associations between crown-implant ratios and first bone-to-implant contact levels.
Subject(s)
Crowns , Dental Implants, Single-Tooth , Dental Prosthesis Design , Adult , Aged , Aged, 80 and over , Alveolar Process/diagnostic imaging , Cohort Studies , Dental Prosthesis, Implant-Supported , Female , Follow-Up Studies , Humans , Male , Mandible/diagnostic imaging , Maxilla/diagnostic imaging , Middle Aged , Osseointegration/physiology , Radiography, Bitewing , Retrospective Studies , Surface Properties , Treatment Outcome , Young AdultABSTRACT
Se presentan 11 casos de mamas patológicas diagnosticadas en el Servicio 6 de la Maternidad Concepción Palacios (M,C.P), por palpación médica en puérperas a quienes, posteriormente, en el Servicio de Patología Mamaria de la institución, les fue realizada citología con agua fina, diagnosticándose en una paciente con frotis hemorrágico, más mamografía, con signos indirectos de malignida, carcinoma ductal infiltrante con áreas de escirrosis, más fibroadenoma coexistente en mama lactante destancándose la importancia del examen clínico por parte del gineco-obstetra, y confirmando hallazgos previos de citologías no concluyentes en carcinomas escirrosos,de utilidad de la mamografía en lactancia y de coexistencia de carcinoma con patología benigna de la mama. Se realiza revisión bibliografica y se concluye en la necesidad de programa de pesquisa en embarazo, puérpera y lactante por parte del obstetra
