Comparison of rerupture rates after operative and nonoperative management of Achilles tendon rupture in older populations: Systematic review and meta-analysis.

Background: This systematic review and meta-analysis investigated the treatment for Achilles tendon rupture (ATR) associated with the lowest risk of rerupture in older patients. Methods: Five databases were searched through September 2022 for studies published in the past 10 years analyzing operative and nonoperative ATR treatment. Studies were categorized as "nonelderly" if they reported only on patients aged 18-60 years. Studies that included at least 1 patient older than age 70 were categorized as "elderly inclusive." Of 212 studies identified, 28 were eligible for inclusion. Of 2965 patients, 1165 were treated operatively: 429 (37%) from elderly-inclusive studies and 736 (63%) from nonelderly studies. Of the 1800 nonoperative patients 553 (31%) were from nonelderly studies and 1247 (69%) were from elderly-inclusive studies. Results: For nonoperative treatment, the rate of rerupture was higher in nonelderly studies (83/1000 cases, 95% CI = 58, 113) than in elderly-inclusive studies (38/1000 cases, 95% CI = 22, 58; P<.001). For operative treatment no difference was found in the rate of rerupture between nonelderly studies (7/1000 cases, 95% CI = 0, 21) and elderly-inclusive studies (12/1000 cases, 95% CI = 0, 35; P<.78). Overall, operative treatment was associated with a rerupture rate of 1.5% (95% CI: 1.0%, 2.8%) (P<.001), which was lower than the 5% rate reported by other studies for nonoperative management (P<.001). Conclusion: Older patients may benefit more than younger patients from nonoperative treatment of ATR. More studies are needed to determine the age at which rerupture rates decrease among nonoperatively treated patients. Level of Evidence: 3.

A Case-Control Study for the Effectiveness of Oral Zinc in the Prevention and Mitigation of COVID-19.

Background: The ongoing coronavirus disease-19 (COVID-19) pandemic (caused by an infection with severe acute respiratory syndrome (SARS)-coronavirus (CoV-2) has put a burden on the medical community and society at large. Efforts to reduce the disease burden and mortality over the course of the pandemic have focused on research to rapidly determine age-stratified seroepidemiologic surveys, a centralized research program to fast-track the most promising rapid diagnostics and serologic assays, and the testing of potential anti-viral agents, immunologic therapies, and vaccine candidates. Despite the lack of official recognition for the role of nutrition in the fight against COVID-19 infection, multiple groups proposed zinc supplementation as an adjuvant for the management of participants. Method: In an ambulatory, interventional, prospective, single-blind study, we evaluated the effectiveness of zinc supplementation in the prevention and mitigation of COVID-19 in two similar participant groups. In Clinic A (n = 104) participants were randomized to receive 10 mg, 25 mg, or 50 mg zinc picolinate daily, and Clinic B control participants paired according to their demographics and clinical parameters (n = 96). All participants were compared based on demographics, clinical comorbidities, blood counts, renal functions, vitamin D levels, and their development of symptomatic COVID-19 infection. Results: Symptomatic COVID-19 infection was significantly higher among the control group participants (N = 9, 10.4%) than the treatment participants (N = 2, 1.9%), p = 0.015. The unadjusted odds ratio indicates that symptomatic COVID-19 infection was 5.93 [95% CI: 1.51, 39.26] higher in the control group, p < 0.01. Controlling for co-morbidities, individuals in the control group were 7.38 (95% CI: 1.80, 50.28) times more likely to develop symptomatic COVID-19 infection as compared with individuals in the treatment group (p < 0.01). For every-one unit increase in the number of co-morbidities, the likelihood of developing symptomatic COVID-19 infection increased 1.57 (95% CI: 1.16, 2.19) (p = 0.01). Discussion: The findings from our study suggest that zinc supplementation in all three doses (10, 25, and 50 mg) may be an effective prophylaxis of symptomatic COVID-19 and may mitigate the severity of COVID-19 infection. Conclusion: Zinc is a relatively inexpensive mineral nutrient that is an effective prophylactic agent to prevent and mitigate the potentially deadly symptomatic SARS-CoV-2 infection. As the COVID-19 pandemic continues with a lag in vaccinations in some regions and the continued emergence of dangerously infectious variants of SARS-CoV-2, it is important to replicate our data in other populations and locations and to engage public health and nutrition services on the emergent need to use zinc supplantation or fortification of staple foods in the prevention and mitigation of COVID-19 infection severity.

Gender and Pharmacists' Career Satisfaction in the United States.

Job satisfaction reflects pharmacists' evaluation of their current work experiences, while career satisfaction is an evaluation of how satisfied pharmacists are with their profession across various jobs. The objectives of this article were to measure career satisfaction and specific facets of current-job satisfaction of U.S. pharmacists, compare satisfaction across genders, and examine the determinants of career satisfaction. This study was based on self-reported survey data collected from a random sample of licensed pharmacists practicing throughout the United States. The sample consisted of 422 men and 315 women. Within each gender, pharmacists' career satisfaction was modeled using ordinary least squares as a function of three sets of variables: personal characteristics, earnings and workweek, and other job-related variables. Female pharmacists exhibited higher levels of contentment with their careers than their male counterparts. Their career-satisfaction levels were not affected by age, marital status, annual earnings, or average workweek, covariates that systematically influenced male pharmacists' career satisfaction. Job satisfaction substantially affected pharmacists' long-term career satisfaction. Male and female pharmacists responded differently to stimuli, so a uniform set of work-related incentives may not be effective for both genders. Initiatives perceived by male practitioners as increasing satisfaction may be adversely perceived by female practitioners, and vice-versa.

Phase 2 Trial of GTx-758, an Estrogen Receptor Alpha Agonist, in Men With Castration-Resistant Prostate Cancer.

INTRODUCTION: Novel estrogen therapy has the potential to be efficacious, with a favorable adverse event profile, in castration-resistant prostate cancer (CRPC). We performed a phase 2 trial to assess the ability of GTx-758, an oral selective estrogen receptor alpha agonist, to result in a ≥ 50% PSA decline by day 90, modulate free testosterone and sex hormone-binding globulin (SHBG) levels, and affect estrogen deficiency adverse events. PATIENTS AND METHODS: CRPC patients received GTx-758 in two dose cohorts, 125 and 250 mg/d. The primary endpoint was the proportion of subjects who experienced a ≥ 50% PSA decline by day 90. Secondary endpoints included changes in testosterone, SHBG, bone turnover markers, and hot flashes, as well as safety. RESULTS: Four (10.5%) of 38 (95% CI, 2.9, 24.8; P = .120) and 10 (25.6%) of 39 patients (95% CI, 13.0, 42.1; P < .001) in the GTx-758 125 and 250 mg/d cohorts, respectively, experienced ≥ 50% PSA decline. SHBG was increased, providing a mechanism for notable decreases in free testosterone. In the 250 mg/d cohort, 9 men presented with moderate to severe hot flashes, and after 12 weeks, 4 (44%) of 9 reported either mild or no hot flashes (P = .001). The rate of venous thromboembolic events was 0% and 5.1% in the 125 and 250 mg/d arms, respectively. CONCLUSION: GTx-758 has clinical activity for CRPC in a dose-dependent fashion. GTx-758 resulted in a reduction in hot flashes. On the basis of these findings, further clinical investigation of novel estrogen therapies is warranted.

Theoretical Basis for Virtual Skull Orientation According to Three-Dimensional Frankfort Horizontal Plane for Computer-Aided Surgical Simulation.

PURPOSE: Computer-aided surgical simulation (CASS) is an evolving technology which has significantly affected surgical correction of dentofacial deformities, a key step of which is orientation of the virtual skull model to allow for analysis and treatment planning. Explored in this study is the coplanarity of a 3-dimensional Frankfort horizontal plane (3D FHP). MATERIALS AND METHODS: The 122 17.0 cm field-of-view cone-beam computed-tomogram (CBCT) scans were oriented to a 3D FHP using right porion, right orbitale, and left orbitale. The distance between the 3D FHP and left porion was then measured. The 18 CBCT scans were found to have external fiducial markers which were used for orientation into natural head position (NHP). The distance between left porion and a true horizontal plan coincidental with the right porion was measured. Concordance reliability measures were calculated to compare NHP to 3D FHP. RESULTS: The average distance of left porion to 3D FHP was found to be -0.107 mm (SD = 1.148), and the average distance from the coincidental left porion in NHP was found to be 0.846 mm (SD = 2.611). Concordance reliability calculations shows little consistency between the 2 methods of orientation (P = 0.838). CONCLUSIONS: The data shows coincidence between left porion and 3D FHP. Orientation of the virtual skull model according to 3D FHP offers a quick and easy method for this important step in CASS. Further study is needed for evaluation of this method in vivo.

Gender and Age Variations in Pharmacists' Job Satisfaction in the United States.

While several studies have attested the presence of systematic gender and age variations in pharmacists' satisfaction with their jobs, only a few of them have considered both classifications simultaneously. None have done so while systematically examining multiple facets of practitioners' work. This article estimated U.S. pharmacists' satisfaction levels with various facets of their work, compared them simultaneously between genders and among age groups, and tested for the presence of gender-age interaction effects. The study was based on self-reported survey data collected from 701 pharmacists (31.0% response rate). Mean and standard deviation values for 18 indices related to pharmacists' work were calculated. When age groups were controlled, female pharmacists expressed overall higher levels of satisfaction with their job than male pharmacists; they also expressed greater satisfaction with multiple specific facets and with the profession, as well as greater workload and stress than male pharmacists. The findings revealed few significant differences among age groups and a limited gender-age interaction effect for pharmacists' satisfaction with key facets of their work. These findings should contribute to the development and refinement of rational criteria for increasing sources of satisfaction in pharmacy settings.

Pockets of Inequality in the Distribution of U.S. Pharmacists' Wages and Salaries: A Gender Comparison.

BACKGROUND: The literature contains conflicting arguments regarding inequalities in the distribution of U.S. pharmacists' wages and salaries and the existence of a gender earnings gap. Some authors argue that the dispersion is small compared to other professions and there is no gap; others report that after controlling for number of hours worked, human-capital stock, and job-related preferences, male pharmacists earn higher wages and salaries than female pharmacists. OBJECTIVES: Estimate the central tendency and spread of wages and salaries of pharmacists practicing in the U.S., compare earning levels of male and female pharmacists, and examine the pockets of inequality within each gender. METHODS: The study used self-reported survey data collected from a random sample of licensed pharmacists practicing throughout the United States. The sample consisted of 375 men and 279 women. Means and standard deviations of wage-and-salary earnings for male and female pharmacists were estimated by age, number of hours worked, years of professional experience, marital status, type of pharmacy degree, main role as pharmacist, and type of practice site. The spread of wages and salaries within gender was analyzed using the Gini coefficient. RESULTS: A total of 654 pharmacists provided answers to all relevant questions in the questionnaire (28.9% response rate). Wages and salaries of male pharmacists exceeded those of female pharmacists, but the gap was restricted to practitioners with selected characteristics-older, married, with more experience, whose primary role was dispensing medications, and practicing in a hospital setting. The greatest wage-and-salary inequalities were observed among older pharmacists, with more years of professional experience, and whose primary role was dispensing medications. Different gender-specific pockets of inequality were identified in all variables studied and all categories within these variables. CONCLUSION: The seemingly smooth gender-specific distribution of earnings in the pharmacy profession might be the result of opposing trends by different groups of practitioners that cancel each other when analyzed aggregately. By estimating the wages and salaries for selected categories of pharmacists and examining the pockets of inequality within each gender, this study shed light into recent labor market developments and will hopefully stimulate further research into the dynamics of the pharmacist workforce.

Gender differences in the measurement of pharmacists' job satisfaction.

BACKGROUND: Men and women choose different levels of commitment in their careers and at home. Compared to men, women value the significance of tasks performed and social relations more and earnings less. The objective of this study was to explore whether male and female pharmacists show the same levels of satisfaction overall and with key facets of their job, whether overall satisfaction is associated with satisfaction with 12 key facets of pharmacists' jobs, and whether this association is similar for men and women. METHODS: The study used self-reported survey data collected from a random sample of licensed pharmacists practicing throughout the United States. The sample consisted of 436 males and 300 females. Pearson correlation coefficients were calculated to assess the association between overall job satisfaction and its key components. The 13 job satisfaction indices and the Pearson correlation coefficient values were compared by gender. RESULTS: Women were consistently more satisfied than men. Variations in overall job satisfaction were at best accompanied by moderate variations in the 12 job satisfaction facets, raising concerns about the validity of configuring a composite index from multiple indices of satisfaction. CONCLUSION: The results of this study can be used by healthcare managers and policymakers to facilitate communication, enhance teamwork, and promote a better allocation of scarce resources. Since men and women responded differently to various facets of their jobs, a constant set of rewards and stimulants may not be equally effective for both genders as employers transform the workplace to more adequately meet practitioners' needs and increase their productivity.

Predicting medication adherence in older Hispanic patients with type 2 diabetes.

PURPOSE: Potential cognitive and demographic correlates of medication nonadherence in older Hispanic adults with type 2 diabetes were investigated. METHODS: Forty community-dwelling participants 65 years of age or older were recruited. Executive control function (ECF) was assessed using the executive clock drawing task (CLOX 1) test and the 25-item Executive Interview. Self-reported medication adherence was measured on a visual analog scale (VAS); measures of glycemic control included glycosylated hemoglobin (HbA1c) concentration. The primary objective was to determine if ECF performance correlated with medication adherence or glycemic control. RESULTS: Participants' mean ± S.D. age was 74.95 ± 7.07 years, and 73% (n = 29) were female. Lower VAS scores correlated with worse CLOX 1 performance (r = 0.38, p = 0.02) and worse HbA1c status (r = -0.42, p = 0.007). Linear regression modeling indicated significant associations between VAS scores and both CLOX 1 results (beta coefficient [ß] = 0.41, p = 0.01) and educational level (ß = 0.345, p = 0.03). Receiver operating characteristic analysis of CLOX 1 scores (scoring range, 0-15; lower scores indicate greater impairment) showed that a highly sensitive cutoff score for predicting adherence of <90% would be 7, but a cutoff of 10 would provide more specificity. CONCLUSION: Results of an evaluation of a small sample of Hispanic older adults with type 2 diabetes demonstrated a relationship between ECF, as measured by the CLOX 1 instrument, and self-reported medication adherence.

Non-modifiable determinants of pharmacy residency match rates.

OBJECTIVE: The purpose of this study was to examine non-modifiable pharmacy program characteristics on residency match rates. METHODS: American Society of Health-System Pharmacists match and non-match lists were de-identified and evaluated for students graduating in 2015. Variables analysed included length of program, type of institution and didactic grading scheme. KEY FINDINGS: Students from 4-year programs, attending a public institution, or using a grade point average had greater odds of matching. Logistic regression model indicated a good model fit (χ2 (2) of 4.44, P = 0.108). CONCLUSIONS: Students considering residency training may benefit from awareness of such factors when choosing a pharmacy program.

Effect of Two-minute Application of 35% Sodium Ascorbate on Composite Bond Strength following Bleaching.

AIM: The aim of this study is to assess the effect of 35% sodium ascorbate on microtensile bond strength of dentin immediately after bleaching with 35% hydrogen peroxide. MATERIALS AND METHODS: A total of 25 sound human 3rd molars were collected. Teeth were randomly divided into five groups for different treatments: Group I [bleaching + immediate bonding (i.e., restoration)], group II (bleaching + delayed bonding), group III (bleaching + sodium ascorbate + immediate bonding), group IV (bleaching + sodium ascorbate + delayed bonding), and group V (bonding only). After bleaching, but before bonding, groups II and IV were stored for 1 week in deionized water at 37°C. All samples were bonded using OptiBoned FL (Kerr) and Filtek Supreme (3M/ESPE). Teeth were sectioned into 1 × 1 mm 2 bars, and microtensile bond strength was tested with a universal testing machine (Instron 8841) at a cross-head speed of 0.5 mm/minute. RESULTS: Microtensile bond strength differed significantly across the five groups, with a significant reduction in microtensile bond strength observed for samples in group I relative to samples in any of the other treatment groups (p < 0.05). CONCLUSION: The application of a high concentration of sodium ascorbate for a shorter time reversed the negative effect of 35% hydrogen peroxide bleaching on composite bonding strength to dentin. CLINICAL SIGNIFICANCE: The negative effects of bleaching on composite bonding can be neutralized by the application of the reversing agent sodium ascorbate thus, increasing the efficiency of clinic chair time. This is clinically relevant for those patients requiring restorative treatment immediately after in-office bleaching.

Prevalence and ethnic/racial disparities in the distribution of pediatric injuries in South Florida: implications for the development of community prevention programs.

BACKGROUND: The state of Florida continues to report significant gender, ethnic and racial disparities in trauma incidence, access to care and outcomes in the adult population. Our objective was to assess pediatric injury profiles and ethnic/racial disparities of specific injuries in a Regional Trauma Center (TC) in South Florida. METHODS: Retrospective data from November 2011 to December 2015 were obtained from the Level 2 TC registry for children ≤21 years old. Demographic, injury pattern, geographic area, injury scores and treatment data were analyzed. RESULTS: One thousand six hundred ten patients, ages 0-21 years were cared for at the TC from 2011 to 2015.73% were males. Mean age = 15.7 years. Mortality was 2.3%. Using zip code data and using geographic mapping, we identified two main clusters where injuries were occurring. A multinomial regression analysis demonstrated that Hispanics had higher risks of falls (RR 10.4, 95% CI 2.7-29), motorcycle accidents (RR 3.7, 95% CI 1.7-8.2) and motor vehicle accidents (RR 6.4, 95% CI 3.6-11.4). Black/African American children had higher risks of gunshot wounds and resultant mortality (p < 0.01). CONCLUSION: There were racial, ethnic and gender disparities in the patterns of injury and outcomes among the youth attended at our TC. Geographic mapping allowed us the identification of the zones in South Florida where injuries were occurring. Understanding the differences and using geographic mapping to identify regions of higher prevalence will complement planning for prevention programs.

Role of Residency Interview Preparatory Activities as a Determinant on Pharmacy Residency Match Rates.

PURPOSE: Different strategies have been implemented to assist students in securing residency positions. The purpose of this study was to explore the impact of student participation in residency preparation activities on match rates. METHODS: A retrospective observational study was conducted to explore the effect of participation in residency preparation activities and grade point average (GPA) on residency match rate. Match rates for students participating in the Residency Interview Preparation Seminar (RIPS) or mock interviews (ie, intervention group) were compared with students who participated in neither activity (ie, control group). RESULTS: A total of 118 individuals were included in the comparison. Forty-eight students participated in RIPS (n = 29) or mock interviews (n = 19), while 70 students were in the control group. The intervention group had a statistically larger proportion of students securing residency than the control group (81% vs 57%; P = .009). Match rates between students enrolled in RIPS versus those in the mock interview group were not significant. No statistically significant differences were observed based on GPA. CONCLUSION: Students receiving additional preparation prior to interviews when seeking postdoctoral training were significantly more likely to obtain a residency position. In academic settings with limited resources, mock interviews may be preferred over comprehensive preparatory courses.

Response rate, response time, and economic costs of survey research: A randomized trial of practicing pharmacists.

BACKGROUND: There is a gap between increasing demands from pharmacy journals, publishers, and reviewers for high survey response rates and the actual responses often obtained in the field by survey researchers. Presumably demands have been set high because response rates, times, and costs affect the validity and reliability of survey results. OBJECTIVE: Explore the extent to which survey response rates, average response times, and economic costs are affected by conditions under which pharmacist workforce surveys are administered. METHODS: A random sample of 7200 U.S. practicing pharmacists was selected. The sample was stratified by delivery method, questionnaire length, item placement, and gender of respondent for a total of 300 observations within each subgroup. A job satisfaction survey was administered during March-April 2012. RESULTS: Delivery method was the only classification showing significant differences in response rates and average response times. The postal mail procedure accounted for the highest response rates of completed surveys, but the email method exhibited the quickest turnaround. A hybrid approach, consisting of a combination of postal and electronic means, showed the least favorable results. Postal mail was 2.9 times more cost effective than the email approach and 4.6 times more cost effective than the hybrid approach. CONCLUSION: Researchers seeking to increase practicing pharmacists' survey participation and reduce response time and related costs can benefit from the analytical procedures tested here.

Survey of Current Clinical and Curriculum Practices of Postgraduate Pediatric Dentistry Programs in Nonintravenous Conscious Sedation in the United States.

PURPOSE: The purposes of this study were to: (1) describe the sedation protocols of postgraduate pediatric dentistry programs (PPDPs) in the U.S.; (2) evaluate how consistent they were with current American Academy of Pediatric Dentistry sedation guidelines and Commission on Dental Accreditation (CODA) sedation curriculum requirements; (3) identify barriers to and tools for implementing these guidelines; and (4) determine the independent association between PPDPs' adherence to guidelines and the program setting. METHODS: In February 2015, a 40-item questionnaire was e-mailed to all postgraduate pediatric dentistry program directors (PPDPDs) of CODA-accredited programs in the U.S. (n equals 74). Data were analyzed using descriptive statistics and Kruskal-Wallis and pairwise Nemenyi tests. RESULTS: Fifty-two PPDPDs responded (70 percent). Since the 2013 change in CODA sedation requirements, only a limited number of PPDPs (36 percent) were found to be noncompliant with CODA standards. PPDPDs trained at hospital-based programs were found to direct programs that were more compliant with CODA sedation standards (P<.05). A major perceived barrier to increasing the number of sedation cases was the lack of a patient pool (37 percent). CONCLUSIONS: Further efforts should be made by teaching institutions for programs to be compliant with American Academy of Pediatric Dentistry and Commission on Dental Accreditation sedation standards.

Case Study of an Unsustainable Community-Academic Partnership: Toward Core Standards for the Structure of Emerging Participatory Research.

This report retrospectively examines the structure of an emerging community-academic participatory research (PR) partnership that was not sustainable, despite attempts to adhere to PR principles and demonstrable success in research outcomes. The influence of community and academic parent organizations on the PR process and outcomes is presented in the context of the Donabedian Model. We dissected the structural elements contributed by parent organizations to forming the structure of the PR partnership (memorandum of understanding, policy environment, human resources and effort, community and academic resources, expertise and experience, and funding) and explored the influence of potential and actual conflicts on the PR partnership's sustainability. The effect of potential and actual conflict on the PR process and quality of PR outcomes is discussed. Based on this, we conclude by proposing seven core standards for the establishment and development of emerging community-academic PR partnerships.

The Reliability and Validity of the Power-Load-Margin Inventory: A Rasch Analysis.

Margin is a function of the relationship of stress to strength. The greater the margin, the more likely students are able to successfully navigate academic structures. This study examined the psychometric properties of a newly created instrument designed to measure margin - the Power-Load-Margin Inventory (PLMI). The PLMI was created using eight domains: (A) Student's aptitude and ability, (B) Course structure, (C) External motivation, (D) Student health, (E) Instructor style, (F) Internal motivation, (G) Life opportunities, and (H) University support structure. A three-point response scale was used to measure the domains: (1) stress, (2) neither stress nor strength, and (3) strength. The PLMI was administered to 586 medical, dental, and pharmacy students. A Rasch rating scale model was used to examine the psychometric properties of the PLMI. The PLMI demonstrated acceptable psychometric properties for use with pharmacy, dental, and medical students. The PLMI's primary weakness was with the subscales' reliability. We attribute this to the small number of items per subscale.

Using latent class analysis to model prescription medications in the measurement of falling among a community elderly population.

BACKGROUND: Falls among the elderly are a major public health concern. Therefore, the possibility of a modeling technique which could better estimate fall probability is both timely and needed. Using biomedical, pharmacological and demographic variables as predictors, latent class analysis (LCA) is demonstrated as a tool for the prediction of falls among community dwelling elderly. METHODS: Using a retrospective data-set a two-step LCA modeling approach was employed. First, we looked for the optimal number of latent classes for the seven medical indicators, along with the patients' prescription medication and three covariates (age, gender, and number of medications). Second, the appropriate latent class structure, with the covariates, were modeled on the distal outcome (fall/no fall). The default estimator was maximum likelihood with robust standard errors. The Pearson chi-square, likelihood ratio chi-square, BIC, Lo-Mendell-Rubin Adjusted Likelihood Ratio test and the bootstrap likelihood ratio test were used for model comparisons. RESULTS: A review of the model fit indices with covariates shows that a six-class solution was preferred. The predictive probability for latent classes ranged from 84% to 97%. Entropy, a measure of classification accuracy, was good at 90%. Specific prescription medications were found to strongly influence group membership. CONCLUSIONS: In conclusion the LCA method was effective at finding relevant subgroups within a heterogenous at-risk population for falling. This study demonstrated that LCA offers researchers a valuable tool to model medical data.

Effect of resealing on microleakage of resin composite restorations in relationship to margin design and composite type.

OBJECTIVE: To determine the relationship between margin preparation design and resin-composite type on microleakage with or without re-application of surface-penetrating sealant. METHODS: Class-I resin-composite restorations were completed for 128 extracted human molars. Half of the margins were beveled, the other half, butt-joint. Half of each group was restored with Filtek-Supreme (FS), the other half with Esthet-X (EX) using their respective adhesive systems. Margins were etched and sealed with a surface-penetrating sealant, Fortify. The samples were stored in water 24h, and thermocycled (5,000 cycles, 5°C-55°C). Then, samples were abraded using a toothbrush machine (6,000 strokes). Half of the restorations from each sealant group (n=16) were resealed, and the other half had no further treatment. Thermocycling and tooth brushing were repeated. The samples were sealed with nail polish, immersed in methylene-blue for 8h, sectioned, and magnified digital photographs were taken. Three examiners assessed dye penetration. A 2×2×2 multi-layered Chi-Square analysis, using Cochran-Mantel-Haenszel test was conducted for statistical analysis. RESULTS: No difference was observed between sealed and resealed FS and EX restorations with butt-joint margins. In beveled margins, resealing caused significantly less microleakage (P<.01). No differences were found between restorations either sealed or resealed with bevel margins. In butt-joint margins, at the leakage level deeper than 2/3 of the preparation depth, resealed FS showed less microleakage than EX resealed restorations (P<.01). CONCLUSION: Resealing reduced microleakage in bevel margins, however, in butt-joint margins resealing did not affect the leakage. A significant statistical relationship exists between and within resealing, margin preparation design, type of composite, and microleakage.

Twenty-four month clinical evaluation of fissure sealants on partially erupted permanent first molars: glass ionomer versus resin-based sealant.

BACKGROUND: Glass ionomer sealants are an alternative to resin-based sealants, especially for use in partially erupted permanent molars. The authors conducted a study to compare the retention, marginal staining and cariostatic properties of a glass ionomer sealant with those of a resin-based sealant during a 24-month period. METHODS: We included in this study 39 patients aged 5 through 9 years who had bilateral partially erupted first permanent molars. One of us (S.B.) placed a resin-based sealant (Delton Plus FS+, Dentsply Professional, York, Pa.) (group D) on a partially erupted first molar in one quadrant of the maxilla or mandible and a glass ionomer sealant (GC Fuji Triage White, GC America, Alsip, Ill.) (group T) in the other quadrant. Two masked and calibrated investigators (S.A.A., J.C.) evaluated the sealants for retention, marginal staining and carious lesions at three, six, 12 and 24 months. The authors used a multinomial regression for statistical analysis (P < .05). RESULTS: The recall rate was 69.2 percent at 24 months. Two sealants from group D and three from group T were lost completely. Complete retention rates at 24 months were 40.7 and 44.4 percent for groups D and T, respectively. The authors found no statistically significant difference in retention rates between groups at each recall examination (P > .05). For marginal staining, sealants in the resin-based group exhibited statistically higher marginal staining than did sealants in the glass ionomer group (P < .05). Although the authors detected no caries in teeth in group T, teeth in group D in which the sealant was lost completely experienced demineralization. CONCLUSIONS: Resin-based and glass ionomer sealants exhibited similar retention rates at 24 months. However, marginal staining was lower in the glass ionomer group, and the authors found no caries in teeth in this group. Consequently, glass ionomer sealants may be a better choice when salivary contamination is expected. CLINICAL IMPLICATIONS: Sealing during tooth eruption presents a particular challenge owing to difficulty in isolating the tooth. Glass ionomers may be a better material for sealing partially erupted molars.