Bond strength of self-adhesive resin cements to composite submitted to different surface pretreatments

dos Santos, Victor Hugo,Griza, Sandro,de Moraes, Rafael Ratto,Faria-e-Silva, Andre Luis The Korean Academy of Conservative Dentistry 2014 Restorative Dentistry & Endodontics Vol.39 No.1

Objectives: Extensively destroyed teeth are commonly restored with composite resin before cavity preparation for indirect restorations. The longevity of the restoration can be related to the proper bonding of the resin cement to the composite. This study aimed to evaluate the microshear bond strength of two self-adhesive resin cements to composite resin. Material and Methods: Composite discs were subject to one of six different surface pretreatments: none (control), 35% phosphoric acid etching for 30 seconds (PA), application of silane (silane), PA + silane, PA + adhesive, or PA + silane + adhesive (n = 6). A silicone mold containing a cylindrical orifice ($1mm^2$ diameter) was placed over the composite resin. RelyX Unicem (3M ESPE) or BisCem (Bisco Inc.) self-adhesive resin cement was inserted into the orifices and light-cured. Self-adhesive cement cylinders were submitted to shear loading. Data were analyzed by two-way ANOVA and Tukey's test (p < 0.05). Results: Independent of the cement used, the PA + Silane + Adhesive group showed higher microshear bond strength than those of the PA and PA + Silane groups. There was no difference among the other treatments. Unicem presented higher bond strength than BisCem for all experimental conditions. Conclusions: Pretreatments of the composite resin surface might have an effect on the bond strength of self-adhesive resin cements to this substrate.

All-ceramic versus titanium-based implant supported restorations: preliminary 12-months results from a randomized controlled trial

Paul Weigl,Georgia Trimpou,Eleftherios Grizas,Pablo Hess,Georg-Hubertus Nentwig,Hans-Christoph Lauer,Jonas Lorenz 대한치과보철학회 2019 The Journal of Advanced Prosthodontics Vol.11 No.1

PURPOSE. The aim of the present randomized controlled study was to compare prefabricated all-ceramic, anatomically shaped healing abutments followed by all-ceramic abutments and all-ceramic crowns and prefabricated standard-shaped (round-diameter) titanium healing abutments followed by final titanium abutments restored with porcelain-fused-to-metal (PFM) implant crowns in the premolar and molar regions. MATERIALS AND METHODS. Forty-two patients received single implants restored either by all-ceramic restorations (test group, healing abutment, final abutment, and crown all made of zirconia) or conventional titanium-based restorations. Immediately after prosthetic incorporation and after 12 months of loading, implant survival, technical complications, bone loss, sulcus fluid flow rate (SFFR) as well as plaque index (PI) and implant stability (Periotest) were analyzed clinically and radiologically. RESULTS. After 12 months of loading, an implant and prosthetic survival rate of 100% was observed. Minor prosthetic complications such as chipping of ceramic veneering occurred in both groups. No statistical significant differences were observed between both groups with only a minimum of bone loss, SFFR, and PI. CONCLUSION. All-ceramic implant prostheses including a prefabricated anatomically shaped healing abutment achieved comparable results to titanium-based restorations in the posterior region. However, observational results indicate a benefit as shaping the peri-implant soft-tissue with successive provisional devices and subsequent compression of the soft tissue can be avoided. [J Adv Prosthodont 2019;11:48-54] PURPOSE. The aim of the present randomized controlled study was to compare prefabricated all-ceramic, anatomically shaped healing abutments followed by all-ceramic abutments and all-ceramic crowns and prefabricated standard-shaped (round-diameter) titanium healing abutments followed by final titanium abutments restored with porcelain-fused-to-metal (PFM) implant crowns in the premolar and molar regions. MATERIALS AND METHODS. Forty-two patients received single implants restored either by all-ceramic restorations (test group, healing abutment, final abutment, and crown all made of zirconia) or conventional titanium-based restorations. Immediately after prosthetic incorporation and after 12 months of loading, implant survival, technical complications, bone loss, sulcus fluid flow rate (SFFR) as well as plaque index (PI) and implant stability (Periotest) were analyzed clinically and radiologically. RESULTS. After 12 months of loading, an implant and prosthetic survival rate of 100% was observed. Minor prosthetic complications such as chipping of ceramic veneering occurred in both groups. No statistical significant differences were observed between both groups with only a minimum of bone loss, SFFR, and PI. CONCLUSION. All-ceramic implant prostheses including a prefabricated anatomically shaped healing abutment achieved comparable results to titanium-based restorations in the posterior region. However, observational results indicate a benefit as shaping the peri-implant soft-tissue with successive provisional devices and subsequent compression of the soft tissue can be avoided. [J Adv Prosthodont 2019;11:48-54]

Bond strength of self-adhesive resin cements to composite submitted to different surface pretreatments

Victor Hugo dos Santos,Sandro Griza,Rafael Ratto de Moraes,André Luis Faria-e-Silva 대한치과보존학회 2014 Restorative Dentistry & Endodontics Vol.39 No.1

Objectives: Extensively destroyed teeth are commonly restored with composite resinbefore cavity preparation for indirect restorations. The longevity of the restorationcan be related to the proper bonding of the resin cement to the composite. This studyaimed to evaluate the microshear bond strength of two self-adhesive resin cements tocomposite resin. Material and Methods: Composite discs were subject to one of sixdifferent surface pretreatments: none (control), 35% phosphoric acid etching for 30seconds (PA), application of silane (silane), PA + silane, PA + adhesive, or PA + silane+ adhesive (n = 6). A silicone mold containing a cylindrical orifice (1 mm2 diameter)was placed over the composite resin. RelyX Unicem (3M ESPE) or BisCem (Bisco Inc.)self-adhesive resin cement was inserted into the orifices and light-cured. Self-adhesivecement cylinders were submitted to shear loading. Data were analyzed by two-wayANOVA and Tukey’s test (p < 0.05). Results: Independent of the cement used, the PA+ Silane + Adhesive group showed higher microshear bond strength than those ofthe PA and PA + Silane groups. There was no difference among the other treatments. Unicem presented higher bond strength than BisCem for all experimental conditions. Conclusions: Pretreatments of the composite resin surface might have an effect onthe bond strength of self-adhesive resin cements to this substrate.

Genotyping Sleep Disorders Patients

Daniel F. Kripke,Farhad F. Shadan,Arthur Dawson,John W. Cronin,Shazia M. Jamil,Alexandra P. Grizas,James A. Koziol,Lawrence E. Kline 대한신경정신의학회 2010 PSYCHIATRY INVESTIGATION Vol.7 No.1

Objective: The genetic susceptibility factors underlying sleep disorders might help us predict prognoses and responses to treatment. Several candidate polymorphisms for sleep disorders have been proposed, but there has as yet inadequate replication or validation that the candidates may be useful in the clinical setting. Methods: To assess the validity of several candidate associations, we obtained saliva deoxyribonucleic acid (DNA) samples and clinical information from 360 consenting research participants who were undergoing clinical polysomnograms. Ten single nucleotide polymorphisms (SNPs) were genotyped. These were thought to be related to depression, circadian sleep disorders, sleep apnea, restless legs syndrome (RLS), excessive sleepiness, or to slow waves in sleep. Results: With multivariate generalized linear models, the association of TEF rs738499 with depressive symptoms was confirmed. Equivocal statistical evidence of association of rs1801260 (the C3111T SNP in the CLOCK gene) with morningness/eveningness and an association of Apolipoprotein E (APOE) rs429358 with the Epworth Sleepiness Scale (ESS) were obtained,but these associations were not strong enough to be of clinical value by themselves. Predicted association of SNPs with sleep apnea, RLS, and slow wave sleep were not confirmed. Conclusion: The SNPs tested would not, by themselves, be of use for clinical genotyping in a sleep clinic.