Analysis The Bonding Of Common Influence Factors About All Ceramic

Background: oral rehabilitation therapy is a very common oraltreatment, crown is the foundation and essential part of it. With thedevelopment and progress of society, the modern prosthodontics areincreasingly high standards, crown standards have changed. The modern ofcrown needs not only good retention, should also take into account patientcomfort, appearance and safety.On the adhesion and retention, the resin cement materials clinicallyconsidered is the preferred material for all ceramic crown bonded retention,it can form a mixed layer of high intensity with dentin，and to get higherbond strength. As everyone knows, the clinical tooth preparation always leadto serious hypersensitiveness phenomenon, and even some give rise topulpitis, causing great distress to the patient, has a great impact on patientcomfort. So, the tooth after the preparation should be desensitizatied was putforward by more and more medical person, many scholars believe that: thetooth after preparation and desensitizatied can reduce dentin hypersensitivityeffectively, occurrence and prevention of pulpitis. With the vital pulpabutment teeth preparatied needs desensitization by part of scholars, effectsof desensitizer on the mixed layer are questioned by many scholars,especially the clinical widely recognized as Gluma desensitizer and new methods of desensitization of water laser. And the emergence of the allceramic crown is undoubtedly in the appearance and safety requirement ofpatients has a huge increase, whether desensitization agents will affect thebonding about all ceramic crown and dentin, Whether the differentdesensitization and different bonding agents effect the all ceramic bonding.These problems need to be confirmed by further studies.Objective: this experiment through Gluma or water laserdesensitizations and acid etched dentin in vitro, get to know the closeddentinal tubules, And obtain if it can be open dentinal tubules afterappropriate acid etching,even increased mechanical interlocking, affectbonding strength. To study these factors would be affect the strengtht ofviscosity on oxide materials with dentin porcelain. To study the differentdesensitizations, whether to increase the acid corrosion, impact andadhesives of heat pressed ceramic bonding, more comprehensive analysis ofinfluence of bonding effect, to guide the clinical crown bondingMethods：Collected50molars without caries, the crowns of the molars wereremoved to expose the dentin, divided them into a control group A and4experimental groups:B. B1. C. C1(n=10). Put them into1:3fetal bovineserum solution. Taken out after1day, groups B.B1were coated by Glumadesensitizer, water laser treatment groups C, C1. Before bonding， thegroups B1, C1were treated by phosphoric acid for15S, other groups were not treated, the dentin of specimens bonding at the bottom of the same sizezirconia, and to determine the shear strength, the results were analysis withSPSS17.180fresh isolated molars removal of crowns, exposed the dentin,Embedding them in resin.Divided them into three groups randomly, groupsof dentin treatment with A1: nothing, A2:Gluma desensitizer, A3: waterlaser (factor A) respectively. a week later, each group was divided into2subgroups treatment by B1: rinse, B2: phosphoric acid etching for15s+flush(factor B) respectively, then each subgroup was divided into3groupsrespectively bonding the heat pressed ceramics by C1:RelyXTMUnicem,C2:Rely XTMUnicem and5％hydrofluoric acid etching for20seconds and silanization for1minute (HF+SIL), C3:Varoilink (HF+SIL)(factor C).Keeping37℃for36hours, then the specimens for shear stresstest. Analysis of these data with EXCEL and SAS9.2.Results：the bond strength: A group (9.626±0.318) Mpa, B group (12.577±0.374) Mpa, B1group (15.650±0.344) Mpa, C group (9.530±0.391) Mpa,C1group (12.740±0.310) Mpa. Except for the A group compared with Cgroup (P>0.05), B group compared with C1group (P>0.05), was notstatistically significant, the remaining groups paired comparison havestatistical significance (P<0.05).Factor A, B, C(P <0.05)have statistical significance; analysis of the primary interaction, factor A and factor B (P <0.05), factor A and factor C (P<0.05)have statistical significance, while the factor B and factor C(P>0.05)has no statistical significance; Analysis of two level interaction（P>0.05）,it has no statistical significance.Conclusion：1.Gluma desensitizer can enhance the bonding strength of Rely XTMUnicem on dentin, water laser or Gluma desensitization of dentin usedproper phosphoric acid etching can be enhanced bonding strength of RelyXTMUnicem. Two kinds of desensitizations treatment of dentin with RelyXTMUnicem adhesive before the appropriate etching can obtain higherbonding strength, Gluma desensitizer processing appropriate acid obtainedthe highest bonding strength.2. Gluma desensitization etching in15seconds,then bonded with RelyXTMUnicem (HF+SIL) can improve the bonding force obviously. The dentinafter treatmented by Gluma desensitizer and water after laser can improvethe bonding strength with increased etching time.3. When Zirconia all ceramic crown repair teeth in clinically,Recommendations prepared dentin with Gluma desensitizer in treatment,and connected properly etching can obtain stronger adhesion.4. At the clinic, in order to get better retention, you could increase theacid etching appropriately and desensitization to increase the bondingstrength; interface with HF+SIL to improve the bond strength of porcelain. Both could obtain the retentive force larger. At the same time, it also hascertain influence on the bonding results that reasonable selected organicfiller content of the resin.