RESUMO
INTRODUCTION: The Manchester procedure (MP) and sacrospinous ligament hysteropexy (SSHP) have long been established as effective conservative surgeries for treating uterine prolapse. However, there have been limited studies on outcomes comparing these two techniques. METHODOLOGY: This was a prospective cohort study of the British Society of Urogynaecology database between February 2007 and 2023 of MP and SSHP outcomes from 90 centres in the UK. The primary outcome was the Patient Global Impression of Improvement (PGI-I). The other outcomes compared were the absence of pelvic organ prolapse beyond the hymen in any compartment evaluated by the Pelvic Organ Prolapse Quantification (POP-Q), complications, and the incidence of reported symptomatic prolapse within 1 year after the operation. RESULTS: There were 718 women who underwent MP and 2,384 who had SSHP. The PGI-I score was significantly better in the MP group (p value <0.001). The rates of symptomatic prolapse within 1 year (odds ratio [OR] 0.36, 95% confidence interval [CI] 0.18-0.69; p value 0.001), recurrence of prolapse beyond the hymen (OR 0.13, 95% CI 0.03-0.53; p value 0.001) and apical recurrence (OR 0.09, 95% CI 0.01-0.65; p value 0.003) during follow-up examination were lower in the MP group. The combined peri-operative and post-operative complications reported in both groups were comparatively similar. CONCLUSION: The symptom improvement was better and recurrence was lower with the MP than with SSHP at short-term follow-up.
Assuntos
Procedimentos Cirúrgicos em Ginecologia , Ligamentos , Prolapso Uterino , Feminino , Humanos , Prolapso Uterino/cirurgia , Pessoa de Meia-Idade , Idoso , Procedimentos Cirúrgicos em Ginecologia/métodos , Procedimentos Cirúrgicos em Ginecologia/estatística & dados numéricos , Estudos Prospectivos , Reino Unido/epidemiologia , Ligamentos/cirurgia , Resultado do Tratamento , Bases de Dados Factuais , Complicações Pós-Operatórias/epidemiologia , Complicações Pós-Operatórias/etiologia , Sociedades Médicas , RecidivaRESUMO
BACKGROUND: Hepatic steatosis is a common finding in liver histopathology and the hallmark of metabolic dysfunction-associated steatotic liver disease (MASLD), formerly known as non-alcoholic fatty liver disease (NAFLD), whose global prevalence is rising. AIMS: To review the histopathology of hepatic steatosis and its mechanisms of development and to identify common and rare disease associations. METHODS: We reviewed literature on the basic science of lipid droplet (LD) biology and clinical research on acute and chronic liver diseases associated with hepatic steatosis using the PubMed database. RESULTS: A variety of genetic and environmental factors contribute to the development of chronic hepatic steatosis or steatotic liver disease, which typically appears macrovesicular. Microvesicular steatosis is associated with acute mitochondrial dysfunction and liver failure. Fat metabolic processes in hepatocytes whose dysregulation leads to the development of steatosis include secretion of lipoprotein particles, uptake of remnant lipoprotein particles or free fatty acids from blood, de novo lipogenesis, oxidation of fatty acids, lipolysis and lipophagy. Hepatic insulin resistance is a key feature of MASLD. Seipin is a polyfunctional protein that facilitates LD biogenesis. Assembly of hepatitis C virus takes place on LD surfaces. LDs make important, functional contact with the endoplasmic reticulum and other organelles. CONCLUSIONS: Diverse liver pathologies are associated with hepatic steatosis, with MASLD being the most important contributor. The biogenesis and dynamics of LDs in hepatocytes are complex and warrant further investigation. Organellar interfaces permit co-regulation of lipid metabolism to match generation of potentially toxic lipid species with their LD depot storage.
Assuntos
Fígado Gorduroso , Humanos , Doença Crônica , Fígado Gorduroso/metabolismo , Hepatopatias/metabolismo , Hepatopatias/etiologia , Hepatopatia Gordurosa não Alcoólica/metabolismo , Doença Aguda , Metabolismo dos Lipídeos , Fígado/metabolismo , Fígado/patologiaRESUMO
INTRODUCTION AND HYPOTHESIS: Obstetric anal sphincter injuries (OASIS) complicate around 1-2% of deliveries in low- and middle-income countries. Asians are twice more likely to suffer this complication. The 3c and 4th-degree perineal tears that involve the internal anal sphincter muscle and the anal mucosa have been reported to have a poorer outcome and higher risk of recurrence compared to less severe tears. METHODOLOGY: A retrospective 10-year analysis of third- and fourth-degree perineal tears in a tertiary centre was conducted. The maternal, neonatal factors and their respective outcomes after the repair of an OASI were examined and compared between minor (3a and 3b perineal tears) and major anal sphincter tears (3c and 4th-degree perineal tears). RESULTS: Five hundred twenty patients with OASIS were included into the study. Birthweight ≥ 3.5 kg was significantly associated with having a major anal sphincter tear in this study population, OR 1.91 (95% CI 1.21-3.02), p = 0.006. There was no significant difference in having faecal or flatus incontinence after the repair; however, major anal sphincter tears appeared to be more complicated to repair compared to minor anal sphincter tears, requiring involvement of the consultant, p < 0.001. CONCLUSION: Neonatal birthweight ≥ 3.5 kg was the most significant factor in predicting the severity of OASIS in this study population. After appropriate repair, the rates of reported complications appeared similar between the two groups. However, significantly more expertise and resources were required for the repair of higher degree OASIS.
Assuntos
Doenças do Ânus , Incontinência Fecal , Lacerações , Complicações do Trabalho de Parto , Lesões dos Tecidos Moles , Canal Anal/lesões , Canal Anal/cirurgia , Povo Asiático , Peso ao Nascer , Parto Obstétrico/efeitos adversos , Incontinência Fecal/complicações , Incontinência Fecal/etiologia , Feminino , Humanos , Recém-Nascido , Lacerações/epidemiologia , Lacerações/etiologia , Complicações do Trabalho de Parto/epidemiologia , Complicações do Trabalho de Parto/etiologia , Períneo/lesões , Gravidez , Estudos Retrospectivos , Fatores de RiscoRESUMO
Purpose: This study aimed to assess the requirement of protein in pre-exercise carbohydrate drinks for optimal endurance performance at high intensity and post-exercise fatigue recovery. Methods: Endurance performance at 85% V . ⢠O 2 peak of young men (age 20 ± 0.9 years, V . ⢠2peak 49.3 ± 0.3 L/min) was measured for two consecutive days using cycling time to exhaustion and total work exerted 2 h after three isocaloric supplementations: RICE (50 g, protein: 1.8 g), n = 7; SOY + RICE (50 g, protein: 4.8 g), n = 7; and WHEY + RICE (50 g, protein: 9.2 g), n = 7. Results: Endurance performance was similar for the three supplemented conditions. Nevertheless, maximal cycling time and total exerted work from Day 1 to Day 2 were improved in the WHEY + RICE (+21%, p = 0.05) and SOY-RICE (+16%, p = 0.10) supplemented conditions, not the RICE supplemented condition. Increases in plasma interleukin-6 (IL-6) were observed 1 h after exercise regardless of supplemented conditions. Plasma creatine kinase remained unchanged after exercise for all three supplemented conditions. Increases in ferric reducing antioxidant power (FRAP) after exercise were small and similar for the three supplemented conditions. Conclusion: Adding protein into carbohydrate drinks provides no immediate benefit in endurance performance and antioxidant capacity yet enhances fatigue recovery for the next day. Soy-containing carbohydrate drink, despite 50% less protein content, shows similar fatigue recovery efficacy to the whey protein-containing carbohydrate drink. These results suggest the importance of dietary nitrogen sources in fatigue recovery after exercise.
Assuntos
Enxerto de Osso Alveolar , Fenda Labial , Fissura Palatina , Dentição Mista , Humanos , Austrália OcidentalRESUMO
OBJECTIVES: The male-factor subfertility was reported to be 30% globally; thus, the intracytoplasmic sperm injection (ICSI) procedure was implemented to improve the overall in vitro fertilization (IVF) rates. Nevertheless, at least 10% of fertilization failure still occurs. Concerning this issue, we explored the association of sperm concentration and motility with the quality of embryo development and pregnancy outcome in IVF-ICSI cycles. METHODS: Retrospective analysis of 109 couples with male factor were done over 14 months in a tertiary university hospital in Malaysia. The data were divided into four groups; Group I: normal sperm parameters, Group II: normal sperm concentration but reduced total sperm motility, Group III: reduced sperm concentration and motility, Group IV: reduced sperm concentration but normal sperm motility. Only fresh semen samples and fresh embryo transfers were included. The fertilization, cleavage rate, embryo quality and pregnancy outcome were assessed. RESULTS: Overall, group I had the highest oocytes yield and ICSI attempted; (10.12 + 6.50), whereas the lowest was in group IV; (7.00 + 2.82). Group II revealed the highest fertilization and cleavage rates; (54.14 + 25.36), (55.16 + 26.06), thus not surprisingly resulting in the highest number of good embryos and highest clinical pregnancy rates. The lowest cleavage and pregnancy rates were seen in group IV. However, all the outcomes were not statically significant (p>0.05). CONCLUSIONS: Similar fertilization rate and comparable pregnancy outcome was seen among couples with normal and reduced sperm concentration and motility.
Assuntos
Contagem de Espermatozoides , Injeções de Esperma Intracitoplásmicas/métodos , Motilidade dos Espermatozoides , Desenvolvimento Embrionário , Feminino , Fertilização in vitro , Humanos , Infertilidade Masculina , Malásia , Masculino , Gravidez , Resultado da Gravidez , Injeções de Esperma Intracitoplásmicas/normasRESUMO
BACKGROUND: Outcomes for a continuously applied alveolar bone grafting protocol, established in 1982, are reported and compared to previously published outcomes from the authors' unit and elsewhere. METHODS: A descriptive, retrospective cohort study of alveolar bone grafting outcomes at a tertiary referral cleft center was performed. Records of all alveolar bone grafts between 2002 and 2014 were reviewed (224 grafts). Three-year postoperative periapical radiographs were evaluated using the Bergland, Kindelan, and standardized way to assess graft scores by an external rater. Incomplete records, a syndromic diagnosis, or primary surgery performed elsewhere resulted in 123 grafts being excluded, leaving 101 grafts for assessment. The distribution of scores was compared to the authors' previous studies and international reports. The authors also tested for any impact on the outcome based on cleft type, laterality, timing for incisor or canine eruption, and surgeon experience. RESULTS: A total of 95.6 percent of applicable grafts (66 of 69) were considered "successful" by Bergland scores and 96 percent by Kindelan scores. Eighty-nine percent of grafts were "very good" based on standardized way to assess graft score. No significant differences were detected in outcomes based on timing, cleft type, or laterality. Surgeon experience had a significant impact (p < 0.05) on outcome for Bergland and Kindelan scores. Distribution of Bergland scores did not differ from the authors' earlier studies demonstrating consistent outcomes for over 30 years. CONCLUSIONS: The Western Australian alveolar bone grafting protocol has consistently achieved a very high success rate (96 percent) for over 30 years despite multiple staff changes. These results compared well with best-reported outcomes from worldwide cleft centers. Surgeon training and experience were significant in achieving these outcomes. CLINICAL QUESTION/LEVEL OF EVIDENCE: Therapeutic, IV.
Assuntos
Enxerto de Osso Alveolar/métodos , Fissura Palatina/cirurgia , Anormalidades Dentárias , Adolescente , Criança , Feminino , Humanos , Masculino , Estudos RetrospectivosRESUMO
BACKGROUND: Musculoskeletal disease is a common cause of morbidity, but there is a paucity of musculoskeletal research focusing on paediatric populations, particularly in primary care settings. In particular, there is limited information on population consultation frequency in paediatric populations, and frequency varies by age and sex. Few studies have examined paediatric musculoskeletal consultation frequency for different body regions. The objective was to determine the annual consultation prevalence of regional musculoskeletal problems in children in primary care. METHODS: Musculoskeletal codes within the Read morbidity Code system were identified and grouped into body regions. Consultations for children aged three to seventeen in 2006 containing these codes were extracted from recorded consultations at twelve general practices contributing to a general practice consultation database (CiPCA). Annual consultation prevalence per 10,000 registered persons for the year 2006 was determined, stratified by age and sex, for problems in individual body regions. RESULTS: Over 8 % (8.27%, 95% CI 7.86 to 8.68%) of the 16,862 children consulted with a musculoskeletal problem during 2006. Annual consultation prevalence for any musculoskeletal problem was significantly higher in males than females (male: female prevalence ratio 1.18, 95% CI 1.06 to 1.31). Annual consultation prevalence increased with age and the most common body regions consulted for were the foot, knee and back all of which had over 100 consultations (109, 104 and 101 respectively) per 10,000 persons per year. CONCLUSIONS: This study provides new and detailed information on patterns of paediatric musculoskeletal consultations in primary care. Musculoskeletal problems in children are varied and form a significant part of the paediatric primary care workload. The findings of this study may be used as a resource for planning future studies.
Assuntos
Doenças Musculoesqueléticas/epidemiologia , Doenças Musculoesqueléticas/terapia , Atenção Primária à Saúde/métodos , Adolescente , Criança , Pré-Escolar , Bases de Dados Factuais/tendências , Feminino , Humanos , Masculino , Doenças Musculoesqueléticas/diagnóstico , Atenção Primária à Saúde/tendências , Reino Unido/epidemiologiaRESUMO
BACKGROUND: Variations in racial haemoglobin had been previously described in multiple studies locally and abroad. This study was conducted to quantify the differences in haemoglobin of booking primigravidae amongst the three major races in Malaysia at the antenatal clinic of University Malaya Medical Centre, Kuala Lumpur. FINDINGS: One year prospective study of booking full blood count sample of primigravidae taken in one centre was conducted. Multiple comparative analyses of the booking haemoglobin were performed using the One-way ANOVA comparative mean test in each trimester. 622 primigravidae without any known history of haematological disorders were recruited into the study. The mean haemoglobin for the Indian race was the lowest compared to the two other races in the second and the third trimesters, and it was found to be statistically significant lower (p- value 0.001) than the Malay race in the second trimester. It was also found that the Indian race had a significantly higher incidence of moderate to severe anaemia (p- value: 0.029). The prevalence of anaemia in our study population is also significantly higher in the Indian population (p- value: 0.01). CONCLUSIONS: The findings from this study have established that there is racial preponderance to anaemia in pregnancy. The Indian race is at a higher risk of having anaemia in pregnancy particularly in the second trimester.
Assuntos
Variação Genética , Hemoglobinas/metabolismo , Grupos Raciais , Adulto , Anemia/epidemiologia , Feminino , Humanos , Malásia/epidemiologia , Gravidez , Complicações Hematológicas na Gravidez/epidemiologia , Prevalência , Estudos ProspectivosRESUMO
The aims of this study were to establish the physical and physiological attributes of elite and sub-elite Malaysian male badminton players and to determine whether these attributes discriminate elite players from sub-elite players. Measurements and tests of basic anthropometry, explosive power, anaerobic recovery capacity, badminton-specific movement agility, maximum strength, and aerobic capacity were conducted on two occasions, separated by at least one day. The elite (n = 12) and sub-elite (n = 12) players' characteristics were, respectively: mean age 24.6 years (s = 3.7) and 20.5 years (s = 0.7); mass 73.2 kg (s = 7.6) and 62.7 kg (s = 4.2); stature 1.76 m (s = 0.07) and 1.71 m (s = 0.05); body fat 12.5% (s = 4.8) and 9.5% (s = 3.4); estimated VO(2max) 56.9 ml . kg(-1) . min(-1) (s = 3.7) and 59.5 ml . kg(-1) . min(-1) (s = 5.2). The elite players had greater maximum absolute strength in one-repetition maximum bench press (P = 0.015) compared with the sub-elite players. There were significant differences in instantaneous lower body power estimated from vertical jump height between the elite and sub-elite groups (P < 0.01). However, there was no significant difference between groups in shuttle run tests and on-court badminton-specific movement agility tests. Our results show that elite Malaysian male badminton players are taller, heavier, and stronger than their sub-elite counterparts. The test battery, however, did not allow us to discriminate between the elite and sub-elite players, suggesting that at the elite level tactical knowledge, technical skills, and psychological readiness could be of greater importance.
Assuntos
Atletas , Desempenho Atlético/fisiologia , Tamanho Corporal , Força Muscular/fisiologia , Aptidão Física/fisiologia , Esportes com Raquete/fisiologia , Adulto , Teste de Esforço , Humanos , Malásia , Masculino , Corrida , Levantamento de Peso , Adulto JovemRESUMO
OBJECTIVES: The aim of this study was to determine the nature of the inflammatory infiltrate associated with different transmucosal implant surfaces in dogs. METHODS: Three experimental and one control single-stage implants were randomly placed on each side of the jaw in eight dogs. The transmucosal portion of the test implants consisted of an acid-etched surface (type A), a machined surface with a circumferential groove (type C) and a surface prepared by mild anodic oxidation (type D). The control was a standard machined surface (type B). In order to determine the response to the different surfaces, plaque control was carried out twice weekly following placement of the implants for the entire period of the experiment. At 6 months, gingival biopsies and plaque samples were obtained. The area of inflammatory infiltrate and the nature of the infiltrating cell types were determined using immunohistology. Real-time polymerase chain reaction was used to identify putative periodontal pathogens. RESULTS: Inflammatory infiltrates were associated with all implant surfaces and were commonly found subepithelially and perivascularly. T cells were the predominant infiltrating cell type in all lesions, associated with the different surfaces. In all lesions the CD4 : CD8 ratio was approximately 2 : 1. Statistical analysis showed that the type C surface (machined surface with a groove) had significantly larger inflammatory infiltrates than the type B surface (machined surface without a groove; P<0.05). No statistically significant differences were found with respect to the size of the inflammatory infiltrates or in terms of the nature of infiltrating cells. However, despite the intensive plaque control regime, plaque was present on all implant surfaces at the time of biopsy 6 months after placement. All implants had similar numbers of Tannerella forsythia, Fusobacterium nucleatum and Porphyromonas gingivalis. Actinobacillus actinomycetemcomitans, was not detected in any sample. CONCLUSIONS: These results suggest that the development of inflammation associated with implants is independent of surface type, but is nevertheless associated with the presence of plaque. The different surfaces had no influence on the nature of the infiltrate, with T cells being the predominant cell type in all lesions. Finally, the different implant surface types seemed not to influence the peri-implant microbiota. However, the presence of the circumferential groove tended to be associated with larger infiltrates. Whether this is due to increased plaque accumulation remains to be determined.
Assuntos
Implantes Dentários , Planejamento de Prótese Dentária , Periodontite/etiologia , Condicionamento Ácido do Dente/métodos , Animais , Linfócitos B/patologia , Bactérias/classificação , Bacteroides/classificação , Relação CD4-CD8 , Implantes Dentários/efeitos adversos , Implantes Dentários/microbiologia , Placa Dentária/etiologia , Placa Dentária/microbiologia , Planejamento de Prótese Dentária/efeitos adversos , Cães , Inserção Epitelial/patologia , Epitélio/patologia , Fusobacterium nucleatum/isolamento & purificação , Gengiva/patologia , Oxirredução , Periodontite/microbiologia , Porphyromonas gingivalis/isolamento & purificação , Distribuição Aleatória , Propriedades de Superfície , Linfócitos T/patologiaRESUMO
OBJECTIVES: The aim of this study was to develop a non-destructive test for characterizing the modulus of resin-based filling materials. METHODS: Five different visible-light-cured composites (Filtek A110 [AO], Z100 [ZO], Filtek Z250 [ZT], F2000 [FT] and Filtek Flow [FF]; 3M-ESPE) were selected for this study. An ESPI (Electronic Speckle Pattern Interferometry) apparatus involving cantilever beam specimens (28 mm long, 8 mm wide and 2 mm thick) was developed for determining modulus. Out-of-plane displacement upon force application was measured using two focus region lengths (22 mm [EI1]; 11 mm [EI2]) and modulus (n = 7) was subsequently computed based on cantilever beam equations. Data was compared to those obtained from three-point-bend flexural testing (n = 7) based on ISO4049:2000 specifications [ISO]. Specimens were stored in distilled water at 37 degrees C for 1 week prior to evaluation for all tests. Results were analyzed using ANOVA/Scheffe's post-hoc tests (p < 0.05) and Pearson's correlation (p < 0.01). RESULTS: Modulus ranged from 5.53 to 13.99, 5.78 to 14.24 and 4.26 to 11.30 GPa for EI1, EI2 and ISO, respectively. For all three tests, the modulus of ZO and FT was significantly greater than ZT, which in turn was significantly greater than AO and FF. Correlation of EI1 and EI2 to ISO was significant, positive and very strong (r = 0.94 for EI1 and EI2). SIGNIFICANCE: ESPI may be a viable method of characterizing the modulus of resin-based filling materials. As it is a non-destructive test, time-dependent effects of composites can be determined using the same specimens leading to substantial time and material savings.
Assuntos
Resinas Compostas , Análise de Variância , Compômeros/química , Resinas Compostas/química , Restauração Dentária Permanente , Análise do Estresse Dentário/métodos , Elasticidade , Cimentos de Ionômeros de Vidro/química , Interferometria/métodos , Lasers , Teste de Materiais/métodos , Maleabilidade , Dióxido de Silício/química , Estatísticas não Paramétricas , Zircônio/químicaRESUMO
Factors which increase the risk of severe adult periodontitis (AP) may also contribute to the success of dental implants. To determine which cytokines may be relevant, levels of interleukin-1alpha (IL-1alpha), interleukin-1beta (IL-1beta), interleukin-1 receptor antagonist (IL-1ra), interleukin-6 (IL-6) and interferon-gamma (IFN-gamma) mRNA were quantitated in gingival tissue from periodontitis patients and healthy controls. Periodontitis significantly increased levels of IL-1alpha, IL-1beta, IL-6 and IFN-gamma mRNA relative to healthy tissues. IL-1 was selected for further study, as it has inflammatory and bone resorbing properties. We examined IL-1A(-889) and IL-1B(+3953) alleles in Caucasian patients with AP and early-onset periodontitis (EOP), patients with dental implants and healthy individuals. The IL-1B(+3953) polymorphism was associated with AP. This was evident from an increased homozygosity for allele 2 in patients with AP and a decreased heterozygosity in advanced AP patients. IL-1A(-889) and a composite genotype [IL-1A(-889)2 plus IL-1B(+3953)2] showed no association with the incidence of periodontitis, disease onset or disease severity. IL-1A(-889), IL-1B(+3953) and the composite genotype also showed no association with failure of dental implants.
Assuntos
Implantes Dentários , Interleucina-1/genética , Periodontite/etiologia , Polimorfismo Genético/genética , Adulto , Idoso , Idoso de 80 Anos ou mais , Periodontite Agressiva/genética , Periodontite Agressiva/imunologia , Alelos , Estudos de Casos e Controles , Falha de Restauração Dentária , Feminino , Previsões , Genótipo , Gengiva/química , Heterozigoto , Homozigoto , Humanos , Interferon gama/análise , Proteína Antagonista do Receptor de Interleucina 1 , Interleucina-6/análise , Masculino , Pessoa de Meia-Idade , Periodontite/genética , Periodontite/imunologia , RNA Mensageiro/análise , Receptores de Interleucina-1/antagonistas & inibidores , Fatores de Risco , Sialoglicoproteínas/análise , Resultado do TratamentoRESUMO
The majority of studies evaluating the efficacy of periodontal therapy have been conducted in university-based clinical trials under ideal and well-controlled conditions, where time (and cost) effectiveness was not an overriding factor. In Australia, where the larger proportion of dental treatment is provided by the private sector, there are no clinical studies which provide information on the efficacy of periodontal treatment in general or specialist private practice. The overall purpose of this study was to evaluate the efficacy of periodontal therapy in a specialist private practice over an initial period of 5.3 years in a group of 100 patients, and subsequently on the remaining 70 patients followed over a period 13.5 years. Hence the total observation period extended over nearly two decades. Using frequency distributions of site data, and statistical inferences based on the patient as the experimental unit, the results indicated an overall improvement and subsequent stability in clinical attachment in all categories of Initial Probing Depths, for both single- and multi-rooted teeth, for teeth treated with root planing alone and those that required adjunctive surgical intervention, and for younger and older patients. It was also noted that very few teeth were lost over the extended observation period. These positive results were achieved in a most favourable time in the initial phase of treatment (1.5-2.0 hours) as compared with the protracted time frame (5-8 hours) recorded in university-based clinical trials. Similarly, professional maintenance therapy took an average of around two appointments per year (1 hour) compared with an average of 3-4 hours per year in the university-based studies. The results therefore proved not only satisfactory from the standpoint of clinical parameters measured but also on the basis of time efficiency.
Assuntos
Doenças Periodontais/terapia , Adulto , Fatores Etários , Feminino , Seguimentos , Defeitos da Furca/terapia , Retração Gengival/terapia , Humanos , Modelos Lineares , Estudos Longitudinais , Masculino , Pessoa de Meia-Idade , Análise Multivariada , Perda da Inserção Periodontal/terapia , Doenças Periodontais/cirurgia , Bolsa Periodontal/terapia , Prática Privada , Aplainamento Radicular , Fatores de Tempo , Perda de Dente/classificação , Resultado do TratamentoRESUMO
BACKGROUND: Previous experimental studies have shown a higher degree of bone-implant contact for surface-enlarged implants compared with machined implants. Yet, there is insufficient evidence that such implants show higher stability and an increased survival rate. PURPOSE: The purpose of this investigation was to study the integration and stability of grit-blasted implants with retention elements on the implant neck, with and without marginal bone defects, compared with machined implants without retention elements. MATERIALS AND METHODS: After tooth extraction of the mandibular premolars in six dogs, two grit-blasted, partly microthreaded Astra Tech implants and one standard Brånemark implant were bilaterally placed in each dog. On one side, 3 yen 3 mm large buccal defects were created, to expose three to four implant threads. The contralateral side served as control, and no defects were made. The animals were sacrificed after 4 months of healing. Implant stability was measured using resonance frequency analysis at implant installation and after 4 months of healing. Histologic and histomorphometric evaluation was made after 4 months of healing. RESULTS: Resonance frequency analysis indicated that all implants in the test and control groups were osseointegrated after 4 months, with a tendency toward higher implant stability for the Astra Tech implants. There was a statistically significant higher increase in resonance frequency for the Astra test implants compared with their corresponding controls. Histology and histomorphometry showed well-integrated implants with varying degrees of bone repair at the defect sites. The greater bone-implant contact for the Astra implants was statistically significant. No significant difference between the implants in amount of bone filling the threads was recorded. CONCLUSIONS: The Astra Tech implants tested showed a higher degree of bone-implant contact and higher level of bone regenerated at defect sites compared with the Brånemark implants. Resonance frequency analysis demonstrated a significantly higher increase in the Astra test implants compared with their control groups than did the Brånemark test implants versus their controls.