scholarly journals 12-Month Self-Ligating Bracket Failure Rate with a Self-Etching Primer

2008 ◽  
Vol 78 (6) ◽  
pp. 1095-1100 ◽  
Author(s):  
Selma Elekdag-Turk ◽  
Fethiye Cakmak ◽  
Devrim Isci ◽  
Tamer Turk
Keyword(s):  
Survival Rate ◽  
Clinical Performance ◽  
Survival Rates ◽  
Rank Test ◽  
Dental Arch ◽  
Bond Failure ◽  
Lower Survival Rate ◽  
Log Rank Test ◽  
Kaplan Meier ◽  
Significant Difference

Abstract Objective: To compare the clinical performance of a self-etching primer (SEP) with a conventional two-step etch and primer method (CM). Materials and Methods: Study subjects were 39 patients with a mean age of 15 years 7 months. Six hundred and eighty-eight brackets were bonded by one operator with a split-mouth design, using Transbond Plus Self-Etching Primer or a conventional two-step etch and primer (Transbond XT). The survival rate of the brackets was estimated by the Kaplan-Meier analysis. Bracket survival distributions with respect to bonding procedure, dental arch, type of tooth (incisor, canine, and premolar) and patients' gender were compared using the log-rank test. Bond failure interface was determined using the Adhesive Remnant Index (ARI). Results: The bond failure rates of SEP and CM were 4.7% and 1.7%, respectively. A significant difference was found between the bonding procedures using the log-rank test (P < .05). Furthermore, canine and premolar teeth displayed a lower survival rate than incisor teeth (P < .05). Survival rates did not show significant differences between the upper and lower dental arches and patients' gender (P > .05). No significant difference was observed for ARI scores (P > .05). Conclusion: These findings indicate that the SEP (Transbond Plus) can be effectively used to bond orthodontic brackets.

scholarly journals Evaluation of Bond Failure Rate of Orthodontic Brackets Bonded with Green Gloo-Two Way Color Changes Adhesive: A Clinical Study

1970 ◽  
Vol 29 (2) ◽  
Author(s):  
Zuber Ahamed Naqvi ◽  
Saleem Shaikh ◽  
Zameer Pasha
Keyword(s):  
Failure Rate ◽  
Sampling Technique ◽  
Orthodontic Brackets ◽  
Rank Test ◽  
Dental Arch ◽  
Failure Rates ◽  
Bond Failure ◽  
Color Changes ◽  
Kaplan Meier ◽  
Significant Difference

BACKGROUND: Bonding is an important step in fixed orthodontic mechanotherapy. Many new materials introduced an adhesive for bonding. This study was designed to evaluate the clinical bond failure rate of orthodontic brackets bonded with green glue: two way color changes adhesive and transbond XT adhesive paste.METHODS: Eighteen male patients with a mean age of 16 years were included in the study. Convenience sampling technique was used to select the sample for this study. The split-mouth design was used to bond 360 brackets by one operator and both adhesives were used in each patient. Bond failure rates were estimated with respect to bonding procedure, dental arch, tooth type (incisor, canine, and premolar). The results were evaluated using the chisquare test. Kaplan – Meier analysis and the log rank test were used to estimate the survival rate of the brackets. Bracket failure rates for each system were analyzed, and failure causes as reported by the patients and the quadrant of each tooth in which bracketsfailed were recorded.RESULTS: The bond failure rate was 5.00% and 4.44% for green gloo and transbond XT group. No significant difference was found in the bond failure rate between transbond XT and Green gloo group. No significant difference was found in the bond failure rate between the two groups, in relation to right and left side and the type of teeth.CONCLUSION: Green gloo adhesive can be effectively used to bond orthodontic brackets.

The Distribution of Yin-Deficient Symptoms and Their Relationship on Survival Rate in Cancer Patients with Yin-Deficiency

2008 ◽  
Vol 36 (04) ◽  
pp. 655-663 ◽  
Author(s):  
Shu-Chuan Lin ◽  
Ming-Feng Chen ◽  
Tsai-Chung Li ◽  
Yu-Ho Hsieh ◽  
Shwu-Jiuan Liu
Keyword(s):  
Survival Rate ◽  
Cancer Patients ◽  
Survival Rates ◽  
Rank Test ◽  
Yin Deficiency ◽  
Rate Analysis ◽  
Log Rank Test ◽  
Kaplan Meier ◽  
Product Limit ◽  
Cumulative Probabilities

Yin-Deficiency (YD), representing a status of the human body under lack of nutrition and fluid in traditional Chinese medicine, is commonly seen in late stage of cancer patients. It is not known whether the severity of YD related symptoms/signs can predict the survival rate of cancer patients. This study evaluated the distribution of Yin-deficiency symptoms/signs (YDS) in cancer patients with YD, and investigated whether the severity of YDS can predict the survival rate of cancer patients with YD. From 5 January 2007 to 5 May 2007, we selected 43 cancer patients with diagnosis of YD from hospitalized patients and outpatients. The severity of YD was evaluated by a questionnaire. We further estimated the cumulative probabilities of the survival rates over 4 months since the start of study by the Kaplan-Meier product-limit method, and compared the differences among groups with various severities in each symptom/sign with the use of the log-rank test. The results revealed that, the 3 most common YDS were sleeplessness with annoyance, less or non-coated tongue with or without redness and dry mouth. In the survival rate analysis, only 2 parameters, rapidly small pulse (p = 0.002) and less-or non-coated tongue with paleness (p = 0.017), were found to be related to the decrease of cancer patients with YD. This suggests that, both rapidly small pulse and less-or non-coated tongue without redness may be used as predictors for the estimation of survival rate in cancer patients with YD.

scholarly journals Clinical Performance of Lithium Disilicate Glass-Ceramic Onlays For The Treatment of Tooth Defects

2021 ◽  
Author(s):  
Shujiang Chen ◽  
Meng Lu ◽  
Zhimin Zhu ◽  
Wenchuan C. Chen
Keyword(s):  
Survival Rate ◽  
Glass Ceramic ◽  
Clinical Performance ◽  
United States Public Health ◽  
Lithium Disilicate ◽  
Western China ◽  
Rank Test ◽  
Log Rank Test ◽  
Kaplan Meier ◽  
Chi Squared

Abstract BackgroundThe aim of this study was to assess the clinical performance of lithium disilicate glass-ceramic onlays for the treatment of tooth defects and to evaluate the clinical performance and whether they are worth more extensive use as that of the full crown. MethodsPatients who received treatment by lithium disilicate glass-ceramic onlays at the Western China Hospital of Stomatology were recalled after 1~4 years. The clinical performance and patients’ satisfaction of onlays for various tooth defects, cracked or uncracked teeth and endodontically treated or vital teeth were retrospectively evaluated with a combination of modified United States Public Health Service Criteria and questionnaire survey. Statistical analysis was performed by using the chi-squared test, Kaplan–Meier analysis and Log-rank test (a = 0.05) where appropriate. ResultsA total of 154 patients with 166 onlays were recalled for clinical examination. Of the 166 onlays examined, 65 (39.19%) were occlusal onlays, 92 (55.42%) were proximal-occlusive onlays and 9 (5.42%) were buccal-or lingual-occlusal onlays. The clinical performance of O and PO onlays was not significantly different (P > 0.05), according to USPHS Criteria. Kaplan-Meier analysis showed that the 4-year survival rate of O and PO onlays was 95.4% and 97.8%, respectively while there was no failure happened in buccal-or lingual-occlusal onlays. Log- rank test showed that the kinds of defects/onlays, tooth vitality and tooth crack had no influence on the survival rate (P > 0.05). The overall satisfaction rate was more than 98%.ConclusionsThis medium-term analysis indicated that lithium disilicate glass-ceramic onlays achieved satisfactory clinical performance for the restoration of different tooth defects. The survival rate of onlays was comparable to that of full crown. Different kinds of tooth defects, tooth vitality and tooth crack did not influence performance.Trial registrationThe study was approved by the Medical Ethics Committee of West China Hospital of Stomatology of Sichuan University with the approval number: WCHSIRB-D-2021-300. Consent to participate was not applicable.

scholarly journals Survival of Patients With Testicular Cancer in Lithuania During 1999–2002

Medicina ◽  
2011 ◽  
Vol 47 (1) ◽  
pp. 8 ◽  
Author(s):  
Agnius Juška ◽  
Albertas Ulys ◽  
Laura Kairevičė ◽  
Giedrė Smailytė ◽  
Edgaras Stankevičius ◽  
...  
Keyword(s):  
Survival Rate ◽  
Testicular Cancer ◽  
Cancer Patients ◽  
Cancer Registry ◽  
Survival Rates ◽  
Tumor Stage ◽  
Rank Test ◽  
Log Rank Test ◽  
Kaplan Meier ◽  
Younger Age

The aim of this study was to evaluate the survival of patients with testicular cancer in Lithuania during 1998–2002 and factors that influenced the survival.Material and methods. The survival rates of testicular cancer patients were evaluated using the data of the Lithuanian Cancer Registry for 1998–2002. The survival was evaluated using the Kaplan-Meier method and log-rank test in order to compare the survival rates. The observed survival rates were calculated.Results. The 5-year observed survival rate in Lithuania was 71.2% (95% CI, 64.4%–77.5%). The survival of testicular cancer patients depended on age at the time of diagnosis, histology of tumor, stage and extent of disease.Conclusions. The survival of patients with testicular cancer in Lithuania was substantially lower than in other European countries. The better survival was associated with younger age and lesser extent of metastases.

Long-term Survival Rates of Implants Supporting Overdentures

2015 ◽  
Vol 41 (2) ◽  
pp. 173-177 ◽  
Author(s):  
José Balaguer ◽  
Javier Ata-Ali ◽  
David Peñarrocha-Oltra ◽  
Berta García ◽  
María Peñarrocha-Diago
Keyword(s):  
Survival Rate ◽  
Survival Rates ◽  
Long Term Results ◽  
Dental Arch ◽  
Term Survival ◽  
Lower Survival Rate ◽  
Significant Difference ◽  
A Prospective Study

The study aims were to evaluate survival rates of dental implants in patients wearing maxillary and mandibular overdentures in relation to age, sex, smoking, implant splinting or non-splinting, the maxilla rehabilitated, and number of implants per dental arch. This was a prospective study of patients who were completely edentulous in either mandible or maxilla or both, rehabilitated with implant-retained overdentures, with a follow-up of at least 3 years. 95 patients with 107 overdentures were supported by 360 implants were included in the study. Rehabilitations were monitored over an average of 95 ± 20.3 months (range 36–159). Implant survival in the maxilla was 91.9% and in the mandible 98.6%, representing a statistically significant difference (P < .05). Age, sex and implant splinting did not influence survival rates significantly. Smokers presented a lower survival rate. Implant numbers in the maxilla had a significant influence on survival, 100% for 6 but 85.7% for 4. Three mandibular implants achieved higher survival rates (100%) but with 2 (96.6%) or 4 (99%) survival was lower, although without significant difference. Long-term results suggest that 3-implant mandibular overdentures have an equivalent survival rate to 4-implant overdentures. In the maxilla, results showed that 6 implants may be the best treatment strategy. For smokers with fewer implants retaining the overdentures, there were higher numbers of implant failures.

scholarly journals Influence of nanoparticulated chitosan on the biomodification of eroded dentin: clinical and photographic longitudinal analysis of restorations

2021 ◽  
Vol 32 (1) ◽  
Author(s):  
José Caetano de Souza ◽  
Antônio Cláudio Tedesco ◽  
Luandra Aparecida Unten Takahashi ◽  
Fabiana Almeida Curylofo-Zotti ◽  
Aline Evangelista Souza-Gabriel ◽  
...  
Keyword(s):  
Dental Treatment ◽  
Survival Rates ◽  
Rank Test ◽  
Marginal Adaptation ◽  
Secondary Caries ◽  
Population Demographics ◽  
Log Rank Test ◽  
Kaplan Meier ◽  
Significant Difference ◽  
Pre Treatment

AbstractTo evaluate the influence of the pre-treatment with 2.5% nanoparticulate chitosan (2.5% NanoChi) solution on eroded dentin before the restorative dental treatment. The sample consisted of 22 patients (age between 33 and 52 years) with shallow or medium erosion lesions located in two homologous teeth. The teeth were randomly assigned according to dentin treatment: with 2.5% NanoChi and without with chitosan (control). The NanoChi were applied immediately after acid etching. The teeth were restored with Single Bond Universal (3 M) and Charisma resin (Kulzer). Analyzes were done using modified USPHS (retention, secondary caries, marginal adaptation, and sensitivity) and photographic (color, marginal pigmentation, and anatomical form) criteria at 7 days (baseline) and 1 year. Population demographics, Kaplan–Meier estimates and log-rank test (Mantel–Cox) were calculated for 1 year (α = 0.05). No significant difference was found in the survival rates between groups (p > 0.05) at 7 days and 1 year after treatment. After 7 days, 100% of the restorations were scored as Alpha on all criteria. After 1 year, 91% of the NanoChi restorations were scored as Alpha and 9% as Charlie for the retention, marginal adaptation, and anatomical form criteria, while 86% of the control restorations (without NanoChi) received the Alpha score and 14% received the Charlie. Secondary caries, sensitivity, color, and marginal pigmentation criteria were scored as Alpha in 100% of the restorations. The biomodification of eroded dentin with 2.5% NanoChi did not influence the survival of the restorations after 1 year. The application of 2.5% NanoChi on eroded dentin did not increase failures of resin restorations after 1 year and it can be used as a pre-treatment solution.

scholarly journals A prospective comparative analysis of the survival rates of conventional vs no-prep/minimally invasive veneers over a mean period of 9 years

2021 ◽  
Author(s):  
Beata Smielak ◽  
Oskar Armata ◽  
Witold Bojar
Keyword(s):  
Survival Rate ◽  
Minimally Invasive ◽  
Survival Rates ◽  
United States Public Health ◽  
Rank Test ◽  
Log Rank Test ◽  
Kaplan Meier ◽  
The Mean ◽  
Test Probability ◽  
Observation Period

Abstract Objectives The present study compares the survival rates of 186 conventional and no-prep/minimally invasive porcelain veneers in 35 patients over a mean period of 9 years. Materials and methods The veneers were placed on the incisors, canines, and premolars in 35 patients between January 2009 and December 2010. Fourteen patients received 84 conventional veneers, and 21 patients received 102 no-prep/minimally invasive veneers. The restorations were evaluated at baseline and after every 6 months until June 2019 based on modified United States Public Health Service criteria. The data was analyzed by using Wilcoxon–Breslow–Gehan and Taron–Ware tests. Kaplan–Meier survival and success curves were plotted for two groups of veneers. The results were compared by using the log rank test. A test probability of P < .05 was regarded as significant, while a test probability of P < .01 was considered to be statistically significant. Results The mean survival rate, according to the Kaplan–Meier estimator, was 9.67% for conventional veneers and 100% for the no-prep or minimal prep veneers. A total of ten absolute failures were observed in six patients: eight restoration chipping/fractures, one debonding, and one fracturing of the tooth. Mean success rate time for conventional veneers without absolute or relative failures was 9.32 years, and 10.28 years for no-prep/minimally invasive veneers. Conclusions Over a mean observation period of 9 years, the survival rate of no-prep/minimally invasive veneers exceed that of conventional veneers. Clinical relevance No-prep/minimally invasive veneers appear very effective and should always be considered in certain clinical situations.

scholarly journals Clinical Evaluation of Bracket Bonding Using Two Different Polymerization Sources

2008 ◽  
Vol 78 (5) ◽  
pp. 922-925 ◽  
Author(s):  
Nikolaos S. Koupis ◽  
Theodore Eliades ◽  
Athanasios E. Athanasiou
Keyword(s):  
Failure Rate ◽  
Orthodontic Treatment ◽  
Light Emitting Diode ◽  
Rank Test ◽  
Dental Arch ◽  
Halogen Lamp ◽  
Failure Rates ◽  
Bond Failure ◽  
Significant Difference ◽  
The Right

Abstract Objective: To comparatively assess clinical failure rate of brackets cured with two different photopolymerization sources after nine months of orthodontic treatment. Materials and Methods: The sample of this study comprised 30 patients who received comprehensive orthodontic treatment by means of fixed appliances. Using the same adhesive, 600 stainless steel brackets were directly bonded and light cured for 10 seconds with the light-emitting diode (LED) lamp or for 20 seconds with the conventional halogen lamp. A split-mouth design randomly alternated from patient to patient was applied. Failure rates were recorded for nine months and analyzed with Pearson χ2 test, and log-rank test at α = .05 level of significance. Results: The overall failure rate recorded with the halogen unit (3.33%) was not significantly different from the failure rate for the LED lamp (5.00%). Significantly more failures were found in boys compared with girls, in the mandibular dental arch compared with the maxillary arch, and in posterior segments compared with anterior segments. However, no significant difference was found between the right and left segments. Conclusion: Both light-curing units showed sufficiently low bond failure rates. LED curing units are an advantageous alternative to conventional halogen sources in orthodontics because they enable a reduced chair-time bonding procedure without significantly affecting bond failure rate.

scholarly journals Clinical evaluation of the failure rate of metallic brackets bonded with orthodontic composites

2012 ◽  
Vol 23 (4) ◽  
pp. 399-402 ◽  
Author(s):  
Fábio Lourenço Romano ◽  
Rodrigo Alexandre Valério ◽  
Jaciara Miranda Gomes-Silva ◽  
José Tarcísio Lima Ferreira ◽  
Gisele Faria ◽  
...  
Keyword(s):  
Failure Rate ◽  
Orthodontic Treatment ◽  
Color Change ◽  
Rank Test ◽  
Initial Alignment ◽  
Bond Failure ◽  
Log Rank Test ◽  
Significant Difference ◽  
Mandibular Teeth

The purpose of the present study was to evaluate in vivo the failure rate of metallic brackets bonded with two orthodontic composites. Nineteen patients with ages ranging from 10.5 to 38.7 years needing corrective orthodontic treatment were selected for study. The enamel surfaces from second premolars to second premolars were treated with Transbond Plus-Self Etching Primer (3M Unitek). Next, 380 orthodontic brackets were bonded on maxillary and mandibular teeth, as follows: 190 with Transbond XT composite (3M Unitek) (control) and 190 with Transbond Plus Color Change (3M Unitek) (experimental) in contralateral quadrants. The bonded brackets were light cured for 40 s, and initial alignment archwires were inserted. Bond failure rates were recorded over a six-month period. At the end of the evaluation, six bond failures occurred, three for each composite. Kaplan-Meyer method and log-rank test (Mantel-Cox) was used for statistical analysis, and no statistically significant difference was found between the materials (p=0.999). Both Transbond XT and Transbond Plus Color Change composites had low debonding rates over the study period.

scholarly journals In Vitro Fatigue Resistance of Teeth Restored With Bulk Fill versus Conventional Composite Resin

2016 ◽  
Vol 27 (4) ◽  
pp. 452-457 ◽  
Author(s):  
Gabrielle Branco Rauber ◽  
Jussara Karina Bernardon ◽  
Luiz Clovis Cardoso Vieira ◽  
Hamilton Pires Maia ◽  
Françoá Horn ◽  
...  
Keyword(s):  
Fatigue Resistance ◽  
Composite Resin ◽  
Survival Curve ◽  
Maximum Force ◽  
Lower Percentage ◽  
Rank Test ◽  
Log Rank Test ◽  
Kaplan Meier ◽  
Significant Difference ◽  
Meier Survival Curve

Abstract The aim of this study was to compare the fatigue resistance of restored teeth with bulk fill composite resin, conventional composite resin with incremental insertion and unprepared sound teeth. Twenty-eight extracted maxillary premolars were selected and divided into 4 groups based on composite resin and insertion technique: control (C), conventional composite resin with incremental insertion (I) and bulk fill composite resin with three (BF3) or single increment (BF1). The restored specimens were submitted to fatigue resistance test with a 5 Hz frequency. An initial application of 5,000 sinusoidal load cycles with a minimum force of 50 N and a maximum force of 200 N was used. Next, were applied stages of 30,000 load cycles with the maximum force increasing gradually: 400, 600, 800, 1000, 1200 and 1400 N. The test was concluded when 185,000 load cycles were achieved or the specimen failed. The fatigue resistance data were recorded for comparison, using the Kaplan-Meier survival curve and analyzed by log-rank test at 0.05 significance. Fractures were classified based on the position of the failure - above or below the cementoenamel junction (CEJ). Statistical analysis of the Kaplan-Meier survival curve and log-rank test showed a significant difference between groups (p=0.001). The fracture analysis demonstrated that only 28.58% of failures were below the CEJ in group C, while for groups I, BF1 and BF3 they were 42.85%, 85.71% and 85.71%, respectively. Teeth restored with composite bulk fill in both techniques present similar fatigue resistance values compared with those restored with a conventional incremental insertion of composite, while the fatigue strength values of unprepared sound teeth were higher. Furthermore, unprepared sound teeth showed a lower percentage of fractures below the CEJ.

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