2015
Wear of the implant hexagon with Zirconia and Titanium abutments, loose screw
#2266 International Association of Dental Research General Session, Boston, USA
José Alexandre Reis, P D Mauricio, L Reis, F Vaz
2014
2011
Comparative analysis of oral health students of ISCSEM
__#74 Continental European Division of the International Association for
Dental Research, Budapest, Hungary, 1 de Setembro de 2011
A.G. MANSO, G. SILVA, L. PROENÇA, Objectives: To comparatively evaluate the plaque index (PI) and gingival index (GI) in students of 1st and 5th years of the master's degree in Dental Medicine School of Health Sciences Egas Moniz (ISCSEM). Methods: A transversal study was carried out, in the dental clinic of Egas Moniz - Cooperative Higher Education, a sample of 49 dental students of 1st year and 28 dental students from 5th (30% of total), chosen randomly and without prior notice, at least 6 teeth per quadrant, full crown restored or integrates and with theme oral hygiene performed, until, at least, three hours. We administered a questionnaire, which were approached habits and oral hygiene practices, and preventive knowledge. After calibration between researcher, was calculated the PI and the GI through a clinical examination of the oral cavity of individuals. Data were subjected to descriptive and inferential statistical analysis, the latter using the chi-square test and Mann-Whitney test, for a significance level of 5%. Results: Students in grade 5th have a more careful oral hygiene than the 1st, because they have lower values of PI and GI (p=0.014 and p<0.001). For the questions "Have you had knowledge, through a professional, the correct form to brush your teeth?", "What was the professional?" and "Since began the course, have you changed the form that you made your oral hygiene?" were found in the responses, differences with statistical significance (p<0.001). Conclusions: Students in grade 5th have a more careful oral hygiene than the 1st. The way that dental students take care of theme oral hygiene will be reflected in preventive procedures and how they will transmit the knowledge.
A.G. MANSO, G. SILVA, L. PROENÇA, Objectives: To comparatively evaluate the plaque index (PI) and gingival index (GI) in students of 1st and 5th years of the master's degree in Dental Medicine School of Health Sciences Egas Moniz (ISCSEM). Methods: A transversal study was carried out, in the dental clinic of Egas Moniz - Cooperative Higher Education, a sample of 49 dental students of 1st year and 28 dental students from 5th (30% of total), chosen randomly and without prior notice, at least 6 teeth per quadrant, full crown restored or integrates and with theme oral hygiene performed, until, at least, three hours. We administered a questionnaire, which were approached habits and oral hygiene practices, and preventive knowledge. After calibration between researcher, was calculated the PI and the GI through a clinical examination of the oral cavity of individuals. Data were subjected to descriptive and inferential statistical analysis, the latter using the chi-square test and Mann-Whitney test, for a significance level of 5%. Results: Students in grade 5th have a more careful oral hygiene than the 1st, because they have lower values of PI and GI (p=0.014 and p<0.001). For the questions "Have you had knowledge, through a professional, the correct form to brush your teeth?", "What was the professional?" and "Since began the course, have you changed the form that you made your oral hygiene?" were found in the responses, differences with statistical significance (p<0.001). Conclusions: Students in grade 5th have a more careful oral hygiene than the 1st. The way that dental students take care of theme oral hygiene will be reflected in preventive procedures and how they will transmit the knowledge.
__Bonding of fiber posts with different cements: Aging Influence
#241 Continental European Division of the International Association for Dental Research, Budapest, Hungary, 2 de Setembro de 2011
José Alexandre Reis, Cecilia Rozan, Sónia Silverio, Paulo Mauricio, Santiago Gónzalez Lopez, Luis Proença
Objectives: Measure the bond strength of cement with the push-out test in different root thirds (cervical, middle and apical) at 24h and at 6 months with and without restoration and with different cements Methods: 90 monoradicular teeth, crowns were cut and endodontic treatment was made. The canal preparation was made with a calibrated drill system (Rebilda®, Voco, Germany). The glass fiber post (Rebilda Post, Voco, Germany) was cemented with three different cements RelyX ® Unicem (3M, USA), Rebilda DV (VOCO Cuxhaven, Germany), core•X™ flow, (Dentsply, Konstanz, Germany). The roots were stored in distilled water at 37 º C. They were divided in three groups for each cement. Each group was composed of 10 roots: group A was stored for 24h with a Cavit (3M, USA) filling, group B for 6 months with Rebilda (Voco, Germany) filling and group C without restoration for 6 months. The roots were sectioned to get 1mm disks of the three different root thirds (apical, medial and coronal) and submitted to push-out test, (Instron 3345, Bucks, United Kingdom) at 1,0 mm/min. The Shapiro-Wilk test was used to test the normality. The significance of the differences in strength among luting cements and root thirds was assessed by one-way ANOVA and ANOVA with Brown-Forsythe tests, followed by the Scheffe test for multiple comparisons (p-value of 0.05) Results: For Group A there was no statistical significant difference in any of the cements. For Groups B and C RelyX ® Unicem (3M, USA) had higher results that were statistical significant different from the other cements. At 6 months RelyX ® Unicem (3M, USA) and Rebilda DV (VOCO Cuxhaven, Germany) had higher results without a restoration. Conclusions: Dentin bond strength of the resin adhesives fell over time but RelyX ® Unicem (3M, USA) improved even without a restoration
José Alexandre Reis, Cecilia Rozan, Sónia Silverio, Paulo Mauricio, Santiago Gónzalez Lopez, Luis Proença
Objectives: Measure the bond strength of cement with the push-out test in different root thirds (cervical, middle and apical) at 24h and at 6 months with and without restoration and with different cements Methods: 90 monoradicular teeth, crowns were cut and endodontic treatment was made. The canal preparation was made with a calibrated drill system (Rebilda®, Voco, Germany). The glass fiber post (Rebilda Post, Voco, Germany) was cemented with three different cements RelyX ® Unicem (3M, USA), Rebilda DV (VOCO Cuxhaven, Germany), core•X™ flow, (Dentsply, Konstanz, Germany). The roots were stored in distilled water at 37 º C. They were divided in three groups for each cement. Each group was composed of 10 roots: group A was stored for 24h with a Cavit (3M, USA) filling, group B for 6 months with Rebilda (Voco, Germany) filling and group C without restoration for 6 months. The roots were sectioned to get 1mm disks of the three different root thirds (apical, medial and coronal) and submitted to push-out test, (Instron 3345, Bucks, United Kingdom) at 1,0 mm/min. The Shapiro-Wilk test was used to test the normality. The significance of the differences in strength among luting cements and root thirds was assessed by one-way ANOVA and ANOVA with Brown-Forsythe tests, followed by the Scheffe test for multiple comparisons (p-value of 0.05) Results: For Group A there was no statistical significant difference in any of the cements. For Groups B and C RelyX ® Unicem (3M, USA) had higher results that were statistical significant different from the other cements. At 6 months RelyX ® Unicem (3M, USA) and Rebilda DV (VOCO Cuxhaven, Germany) had higher results without a restoration. Conclusions: Dentin bond strength of the resin adhesives fell over time but RelyX ® Unicem (3M, USA) improved even without a restoration
_Chromatographic Analysis of Eluted Monomers From Three Resin Cements
_#405 Continental European Division of the International Association for Dental Research, Budapest, Hungary, 3 de Setembro de 2011
J. RANGEL, A.G. MANSO, L. PROENÇA, J.P. NORONHA, M.A. BERNARDO, and M.F. MESQUITA,
Objectives: identifying and quantifying residual monomers, through chromatographic technics, leached from three dental resin cements (Multilink® Automix, SpeedCEM® e Dual Cement®) and identifying compounds that aren't described by the manufacturer. Methods:30 human molar teeth were randomly divided in three groups of 10 teeth each. In each group (Group A1, Group A2 and Group A3) a standard Class I cavity was prepared. 30 pre-fabricated lithium dissilicate inlays (IPS e-max Press®) were cemented with different cements: Group A1 (Multilink® Automix); Group A2 (SpeedCEM®) and Group A3 (Dual Cement®). The teeth were stored for 24h in artificial saliva, with neutral pH, at 37ºC +/- 1ºC. Then all of the samples were analysed by HPLC to identify and quantify the studied monomers and by GC-MS to identify leached compounds that aren't described by the manufacturers. In the statistical analysis of the obtained data, ANOVA one-way and t-Student tests were made for a significance level of 5%. Results:In Group A1, results with statistical significance (p=0,033) were obtained when comparing the average concentration values of HEMA (15,73 μg/ml; SD 3,21) and UDMA (10,89 μg/ml; SD 4,62). In Group A2, the obtained average concentration of TEGDMA (3,88 μg/ml; SD 1,40) and UDMA (12,25 μg/ml; SD 4,57) also proved having statistical significance (p<0,001). In group A3 the average concentration of UDMA is 16,69 μg/ml; SD 7,07. However when comparing the UDMA concentrations, found in the three groups, there is no statistical significance (p=0,126). In group A1 and group A2, EDMA and acetic acid were found, respectively. Conclusion:The leached concentrations of the residual monomers make them possible to be analysed by chromatographic technics. The leached concentration of HEMA is bigger than UDMA and the leached concentration of UDMA is bigger than TEGDMA. There are leached compounds that aren't described by the manufacturers.
J. RANGEL, A.G. MANSO, L. PROENÇA, J.P. NORONHA, M.A. BERNARDO, and M.F. MESQUITA,
Objectives: identifying and quantifying residual monomers, through chromatographic technics, leached from three dental resin cements (Multilink® Automix, SpeedCEM® e Dual Cement®) and identifying compounds that aren't described by the manufacturer. Methods:30 human molar teeth were randomly divided in three groups of 10 teeth each. In each group (Group A1, Group A2 and Group A3) a standard Class I cavity was prepared. 30 pre-fabricated lithium dissilicate inlays (IPS e-max Press®) were cemented with different cements: Group A1 (Multilink® Automix); Group A2 (SpeedCEM®) and Group A3 (Dual Cement®). The teeth were stored for 24h in artificial saliva, with neutral pH, at 37ºC +/- 1ºC. Then all of the samples were analysed by HPLC to identify and quantify the studied monomers and by GC-MS to identify leached compounds that aren't described by the manufacturers. In the statistical analysis of the obtained data, ANOVA one-way and t-Student tests were made for a significance level of 5%. Results:In Group A1, results with statistical significance (p=0,033) were obtained when comparing the average concentration values of HEMA (15,73 μg/ml; SD 3,21) and UDMA (10,89 μg/ml; SD 4,62). In Group A2, the obtained average concentration of TEGDMA (3,88 μg/ml; SD 1,40) and UDMA (12,25 μg/ml; SD 4,57) also proved having statistical significance (p<0,001). In group A3 the average concentration of UDMA is 16,69 μg/ml; SD 7,07. However when comparing the UDMA concentrations, found in the three groups, there is no statistical significance (p=0,126). In group A1 and group A2, EDMA and acetic acid were found, respectively. Conclusion:The leached concentrations of the residual monomers make them possible to be analysed by chromatographic technics. The leached concentration of HEMA is bigger than UDMA and the leached concentration of UDMA is bigger than TEGDMA. There are leached compounds that aren't described by the manufacturers.
2010
__Habits and practices of oral hygiene in the hospitalized patient
_#2572 International Association of Dental Research General Session, Barcelona, Espanha 16 de julho de 2010
J CARMO, C. MANSO, L. PROENÇA, and F. SALVADO
Objectives: Assessing whether the daily oral hygiene habits and practices are changing in hospitalized patients and the correlation between the habits and socio-demographic variables. Methods: A transversal study was carried out and obtained through an interview face-to-face, with open and closed questions at the Departments of Medicine and Plastic Surgery, at Centro Hospitalar de Lisboa Norte - Hospital de Santa Maria. The sample composed of 100 conscious hospitalized patients, was randomly chosen, between those with more than three days of internship and over 18 years old. Socio-demographic characteristics; questions related to oral hygiene habits and practices for the period prior to admission and during hospital stay; the hygiene care dependence level and the level of satisfaction with this care were addressed in the questionnaire. Both descriptive and inferential statistics were used to analyze the collected data, the later by applying the Chi-square test (comparing the answers of the period of stay) and McNemar's test (comparing the answers of the period before hospitalization with those of the period during hospitalization).
Results: Differences with statistical significance (p<0.05) have been obtained when comparing: the use of mouthwash before and during hospitalization (p<0.000) and the use of dental floss in the same periods (p=0.016), with a noticeable decrease during hospitalization. The correlation between the use of dental floss before hospitalization and the average family monthly income (p=0.006), showed that its use was greater above 2 minimum monthly salaries.
Conclusion: It was found that the oral hygiene habits and practices have decreased over the period of stay namely on the use of auxiliary methods of plaque control and dental floss. The use of dental floss before hospitalization and the average family monthly income increases from the 2 minimum monthly salaries.
J CARMO, C. MANSO, L. PROENÇA, and F. SALVADO
Objectives: Assessing whether the daily oral hygiene habits and practices are changing in hospitalized patients and the correlation between the habits and socio-demographic variables. Methods: A transversal study was carried out and obtained through an interview face-to-face, with open and closed questions at the Departments of Medicine and Plastic Surgery, at Centro Hospitalar de Lisboa Norte - Hospital de Santa Maria. The sample composed of 100 conscious hospitalized patients, was randomly chosen, between those with more than three days of internship and over 18 years old. Socio-demographic characteristics; questions related to oral hygiene habits and practices for the period prior to admission and during hospital stay; the hygiene care dependence level and the level of satisfaction with this care were addressed in the questionnaire. Both descriptive and inferential statistics were used to analyze the collected data, the later by applying the Chi-square test (comparing the answers of the period of stay) and McNemar's test (comparing the answers of the period before hospitalization with those of the period during hospitalization).
Results: Differences with statistical significance (p<0.05) have been obtained when comparing: the use of mouthwash before and during hospitalization (p<0.000) and the use of dental floss in the same periods (p=0.016), with a noticeable decrease during hospitalization. The correlation between the use of dental floss before hospitalization and the average family monthly income (p=0.006), showed that its use was greater above 2 minimum monthly salaries.
Conclusion: It was found that the oral hygiene habits and practices have decreased over the period of stay namely on the use of auxiliary methods of plaque control and dental floss. The use of dental floss before hospitalization and the average family monthly income increases from the 2 minimum monthly salaries.
_Bonding of Fiber Posts with Modified Resin Cement: Aging Influence
#3933, International Association of Dental Research General
Session, Barcelona, Espanha 17 de julho de 2010
José Alexandre Reis, Paulo Maurício, Luís Proença, Santiago González López Objectives: Measure the bond strength of cement with the push-out test in different root thirds (cervical, middle and apical) and evaluate the type of fracture produced at 24 h and at 6 months.
Methods: 20 monoradicular teeth, crowns were cut and endodontic treatment of the root (AH plus® Dentsply De Trey, Germany and gutta-percha Kerr, Germany) was made. The canal preparation was made with a calibrated drill system (Rebilda®, Voco, Germany). The glass fiber post (Rebilda Post, Voco, Germany) was cemented with RelyX® Unicem (3M, USA) with finger pressure and light polymerization for 40 s. The roots were stored in distilled water at 37 ºC. They were divided in two groups of ten roots: group A was stored for 24 h with a Cavit (3M, USA) filling and group B for 6 months with Rebilda (Voco, Germany) filling. The roots were sectioned at slow speed in order to get 1 mm disks of the three different root thirds (apical, medial and coronal). All specimens were prepared and loaded to fail with the push-out test, Instron 3345 (Instron, Bucks, United Kingdom). Statistical analysis was performed by Student's t-test.
Results: Significant differences were found on the medial and apical root thirds before and after aging (p<0.05). Higher strength results were found on group B.
Conclusion: Aging influenced the bond strength of the cement
José Alexandre Reis, Paulo Maurício, Luís Proença, Santiago González López Objectives: Measure the bond strength of cement with the push-out test in different root thirds (cervical, middle and apical) and evaluate the type of fracture produced at 24 h and at 6 months.
Methods: 20 monoradicular teeth, crowns were cut and endodontic treatment of the root (AH plus® Dentsply De Trey, Germany and gutta-percha Kerr, Germany) was made. The canal preparation was made with a calibrated drill system (Rebilda®, Voco, Germany). The glass fiber post (Rebilda Post, Voco, Germany) was cemented with RelyX® Unicem (3M, USA) with finger pressure and light polymerization for 40 s. The roots were stored in distilled water at 37 ºC. They were divided in two groups of ten roots: group A was stored for 24 h with a Cavit (3M, USA) filling and group B for 6 months with Rebilda (Voco, Germany) filling. The roots were sectioned at slow speed in order to get 1 mm disks of the three different root thirds (apical, medial and coronal). All specimens were prepared and loaded to fail with the push-out test, Instron 3345 (Instron, Bucks, United Kingdom). Statistical analysis was performed by Student's t-test.
Results: Significant differences were found on the medial and apical root thirds before and after aging (p<0.05). Higher strength results were found on group B.
Conclusion: Aging influenced the bond strength of the cement
_Longitudinal Evaluation of Bond Strength of the Cement core•X™ Flow
#3940 International Association of Dental Research General Session, Barcelona, Spain 17 de julho de 2010
S. SILVÉRIO, P. MAURÍCIO, L. PROENÇA, S. GONZÁLEZ-LÓPEZ, and S. FELIX
Objectives: The aim of this study was to evaluate “in vitro” the regional bond strength using Push-out test, after 24 hours and six months of storage, in different thirds of the root canal (cervical, middle and apical), after endodontic treatment and glass fiber posts Voco® luted with self adhesive Voco® and resin cement core•X™ flow, (Dentsply Core & Post System). Methods: This study included twenty human incisors teeth. The mean root length was 14 mm from the apex to the cementum-enamel junction. The roots were endodontically treated and after post cementation were randomly divided in two groups (n=10) modifying the storage period (24 hours and six months with core reconstruction). Group 1, teeth were stored for 24 hours in distilled water at 37ºC and closed with Cavit (3M, USA). Group 2, teeth were reconstructed with a composite and storage for six months in distilled water at 37ºC. Each root was seccionated into 1 mm thick serial slices, and each slice was identified the corresponded third of the root. The Push-out test was performed with a cross-speed of 1,0 mm/min and the results expressed in Mega Pascal (MPa). After the test all specimen interfaces were examined with the aid of a fluorescence optic microscope (40X) to determine the type of failure. The values of the bond strength (MPa) were analyzed with the analysis of t-student test Results: The statistical analysis showed : there is statistically significant difference in the third Coronal (p = 0.015) between group 1 and 2 Conclusions: 1) the statistical significant difference occurred in the third Coronal 2) the higher strength values occurred on group 1
S. SILVÉRIO, P. MAURÍCIO, L. PROENÇA, S. GONZÁLEZ-LÓPEZ, and S. FELIX
Objectives: The aim of this study was to evaluate “in vitro” the regional bond strength using Push-out test, after 24 hours and six months of storage, in different thirds of the root canal (cervical, middle and apical), after endodontic treatment and glass fiber posts Voco® luted with self adhesive Voco® and resin cement core•X™ flow, (Dentsply Core & Post System). Methods: This study included twenty human incisors teeth. The mean root length was 14 mm from the apex to the cementum-enamel junction. The roots were endodontically treated and after post cementation were randomly divided in two groups (n=10) modifying the storage period (24 hours and six months with core reconstruction). Group 1, teeth were stored for 24 hours in distilled water at 37ºC and closed with Cavit (3M, USA). Group 2, teeth were reconstructed with a composite and storage for six months in distilled water at 37ºC. Each root was seccionated into 1 mm thick serial slices, and each slice was identified the corresponded third of the root. The Push-out test was performed with a cross-speed of 1,0 mm/min and the results expressed in Mega Pascal (MPa). After the test all specimen interfaces were examined with the aid of a fluorescence optic microscope (40X) to determine the type of failure. The values of the bond strength (MPa) were analyzed with the analysis of t-student test Results: The statistical analysis showed : there is statistically significant difference in the third Coronal (p = 0.015) between group 1 and 2 Conclusions: 1) the statistical significant difference occurred in the third Coronal 2) the higher strength values occurred on group 1
__Influence of Storage Time on Bond Strength to Root Dentin
#3941 International Association of Dental Research General Session, Barcelona, Spain 17 de julho de 2010
C. ROZAN, P. MAURICIO, S. GONZÁLEZ-LÓPEZ, C.MANSO and L. PROENÇA
Objective: Compare the push-out bond strength of fiber post (Rebilda Post®, Voco, Cuxhaven) luted with resin cement (Rebilda DC®, Voco, Cuxhaven) in different root thirds (cervical, middle,apical) after 24 hour storage and six months storage with core.
Methods: twenty human anterior teeth extracted for periodontal reasons were decoronated and endodontically treated with ProTaper rotary files®, ProTaper® F2 gutta-percha master point (Dentisply/ Maillefer, Ballagigues, Switzerland), AHplus® sealer (Dentsply, De Trey, Germany) and tapered with Cavit™ (3M, ESPE, AG).
After the filled roots were stored in distilled water at 37ºC for 24 hours, post spaces were prepared with low- speed- drills (Rebilda Post®, Voco, Cuxhaven) and all glass fibers posts (Rebilda Post®, Voco, Cuxhaven) were cemented with Rebilda®( Voco, Cuxhaven), seated with finger pressure, light polymerization for 40s. They were divided: Group 1 tapered with Cavit™ (3M, ESPE, AG) and stored in distilled water at 37ºC for 24 hour; Group 2 built with Rebilda® (Voco, Cuxhaven) then stored in distilled water at 37ºC for six months. Both groups were sectioned perpendicularly to the long axis in slices of 1mm per each root containing cross-sections of coronal, middle and apical side. .Push-out was performed by Instron® MD 3345(Instron, Bucks, United Kingdom). Statistical analysis performed by the Student-t test
Results: Showed significant differences on the cervical and apical root thirds between storage time (p<0.05). Higher strength results were found on group 1 except the apical thirds.
Conclusion: The storage time influenced the bond strength of resin core used for fiber post cementation.
C. ROZAN, P. MAURICIO, S. GONZÁLEZ-LÓPEZ, C.MANSO and L. PROENÇA
Objective: Compare the push-out bond strength of fiber post (Rebilda Post®, Voco, Cuxhaven) luted with resin cement (Rebilda DC®, Voco, Cuxhaven) in different root thirds (cervical, middle,apical) after 24 hour storage and six months storage with core.
Methods: twenty human anterior teeth extracted for periodontal reasons were decoronated and endodontically treated with ProTaper rotary files®, ProTaper® F2 gutta-percha master point (Dentisply/ Maillefer, Ballagigues, Switzerland), AHplus® sealer (Dentsply, De Trey, Germany) and tapered with Cavit™ (3M, ESPE, AG).
After the filled roots were stored in distilled water at 37ºC for 24 hours, post spaces were prepared with low- speed- drills (Rebilda Post®, Voco, Cuxhaven) and all glass fibers posts (Rebilda Post®, Voco, Cuxhaven) were cemented with Rebilda®( Voco, Cuxhaven), seated with finger pressure, light polymerization for 40s. They were divided: Group 1 tapered with Cavit™ (3M, ESPE, AG) and stored in distilled water at 37ºC for 24 hour; Group 2 built with Rebilda® (Voco, Cuxhaven) then stored in distilled water at 37ºC for six months. Both groups were sectioned perpendicularly to the long axis in slices of 1mm per each root containing cross-sections of coronal, middle and apical side. .Push-out was performed by Instron® MD 3345(Instron, Bucks, United Kingdom). Statistical analysis performed by the Student-t test
Results: Showed significant differences on the cervical and apical root thirds between storage time (p<0.05). Higher strength results were found on group 1 except the apical thirds.
Conclusion: The storage time influenced the bond strength of resin core used for fiber post cementation.
_Fiber Posts Bond with Modified Resin Cement: Aging, Restoration Influence
_#4484 International Association of Dental Research General Session, Barcelona, Spain 17 de julho de 2010
José Alexandre Reis, Paulo Maurício, Luís Proença, Santiago González López
Objectives: Measure the bond strength of cement with the push-out test in different root thirds (cervical, middle and apical) and evaluate the type of fracture produced at 6 months with or without a restoration.
Methods: 20 monoradicular teeth, crowns were cut and endodontic treatment of the root (AH plus® Dentsply De Trey, Germany and gutta-percha Kerr, Germany) was made. The canal preparation was made with a calibrated drill system (Rebilda®, Voco, Germany). The glass fiber post (Rebilda Post, Voco, Germany) was cemented with RelyX® Unicem (3M, USA) with finger pressure and light polymerization for 40 s. They were divided in two groups of ten roots: group A had a Rebilda (Voco, Germany) filling; Group B had no filling. The roots were stored in distilled water at 37 ºC for 6 months. The roots were sectioned at slow speed in order to get 1mm disks of the three different root thirds (apical, medial and coronal). All specimens were prepared and loaded to fail with the push-out test, Instron 3345 (Instron, Bucks, United Kingdom). Data was analyzed for significant differences using Student's t-test with a significance level of 5%.
Results: No significant differences were found on any root thirds (p<0.05). Higher strength results were found on group B.
Conclusion: No statistical differences in bond strength were found. Highest values were in Goup B
José Alexandre Reis, Paulo Maurício, Luís Proença, Santiago González López
Objectives: Measure the bond strength of cement with the push-out test in different root thirds (cervical, middle and apical) and evaluate the type of fracture produced at 6 months with or without a restoration.
Methods: 20 monoradicular teeth, crowns were cut and endodontic treatment of the root (AH plus® Dentsply De Trey, Germany and gutta-percha Kerr, Germany) was made. The canal preparation was made with a calibrated drill system (Rebilda®, Voco, Germany). The glass fiber post (Rebilda Post, Voco, Germany) was cemented with RelyX® Unicem (3M, USA) with finger pressure and light polymerization for 40 s. They were divided in two groups of ten roots: group A had a Rebilda (Voco, Germany) filling; Group B had no filling. The roots were stored in distilled water at 37 ºC for 6 months. The roots were sectioned at slow speed in order to get 1mm disks of the three different root thirds (apical, medial and coronal). All specimens were prepared and loaded to fail with the push-out test, Instron 3345 (Instron, Bucks, United Kingdom). Data was analyzed for significant differences using Student's t-test with a significance level of 5%.
Results: No significant differences were found on any root thirds (p<0.05). Higher strength results were found on group B.
Conclusion: No statistical differences in bond strength were found. Highest values were in Goup B
2008
_Push-out Bond Strength of Cements on Class II Ceramic Inlays
_#0374 Pan European Federation of the International Association for Dental Research, London, UK September 11 de 2008
C. MANSO, P. MAURÍCIO, S. FÉLIX, M.V. BOLAÑOS-CARMONA, and S. GONZÁLEZ-LÓPEZObjectives: The purpose of this study was to compare push-out bond strength on ceramic inlays to tooth structure, using five luting materials in class II cavities.
Methods:Standardized class II were made in 50 intact caries-free, human extracted and perfused molars, with a special device made to prepare the cavities
The standardized C C eramic Inlays were made in IPS e.max Press® and luted on oclusal proximal cavities. The molars were divided in five groups, according to luting cements: Group I - Excite® DSC + Variolink II®; Group II - Multilink® Sprint; Group III - Multilink® Automix; Group IV - Ketac Cem™ Aplicap; Group V - RelyX™ Unicem. Cementation procedures w ere used according to manufacturers instructions. After storage for 48h at 37ºC and 100% humidity, the teeth were sectioned in disks: 1 of superficial dentin and 1 of deep dentin (circa 1.0mm). Each samples were tested in shear using an Universal Testing Machine - IBERTEST 500®, pushed out with a cross-head speed of 1.0m/min. Data were treated with analysis of variance one-way ANOVA, and Scheffexs test was used for post-hoc comparisons (α=0.05).
ANOVA results showed that bond strength in Mpa to deep dentin was significantly higher than superficial dentin for 3 groups.
Groups I, II and V had higher bond strength. Groups III and IV had lower.
Conclusion: Dual cure mode cements had significantly higher bond strength than Self cure. Curing degree is an important factor that influences the bond strength.
C. MANSO, P. MAURÍCIO, S. FÉLIX, M.V. BOLAÑOS-CARMONA, and S. GONZÁLEZ-LÓPEZObjectives: The purpose of this study was to compare push-out bond strength on ceramic inlays to tooth structure, using five luting materials in class II cavities.
Methods:Standardized class II were made in 50 intact caries-free, human extracted and perfused molars, with a special device made to prepare the cavities
The standardized C C eramic Inlays were made in IPS e.max Press® and luted on oclusal proximal cavities. The molars were divided in five groups, according to luting cements: Group I - Excite® DSC + Variolink II®; Group II - Multilink® Sprint; Group III - Multilink® Automix; Group IV - Ketac Cem™ Aplicap; Group V - RelyX™ Unicem. Cementation procedures w ere used according to manufacturers instructions. After storage for 48h at 37ºC and 100% humidity, the teeth were sectioned in disks: 1 of superficial dentin and 1 of deep dentin (circa 1.0mm). Each samples were tested in shear using an Universal Testing Machine - IBERTEST 500®, pushed out with a cross-head speed of 1.0m/min. Data were treated with analysis of variance one-way ANOVA, and Scheffexs test was used for post-hoc comparisons (α=0.05).
ANOVA results showed that bond strength in Mpa to deep dentin was significantly higher than superficial dentin for 3 groups.
Groups I, II and V had higher bond strength. Groups III and IV had lower.
Conclusion: Dual cure mode cements had significantly higher bond strength than Self cure. Curing degree is an important factor that influences the bond strength.