REPARING CEMENTThe treatment for accidents and endodontic complications

MTA- Angelus1. DESCRIPTIONMTA-Angelus is an endodontic cement composed of several mineral oxides. It is indicated specially for root lateral trepanations treatment and furcation, internal re-absorptions, pareodontics surgeries, retro obturation, direct pulp protection, pulpotomy in incomplete root development teeth. 1.1. Main Advantages: MTA-Angelus presents great advantages relating to amalgam and cements based on zinc oxide and eugenol:Excellent marginal sealer which avoids bacterial migration and tissue fluids penetration to the interior of the radicular canal;Radicular perforations biological enclosing and furcation enclosing through induction of peri-radicular cement formation;Induction of dental barrier formation used upon the pulp;Utilization in locals with presence of relative humidity, without lost of its properties. Different of other materials which demand an operatory field completely dry, normally difficult to get, principally in cases like pareodontics surgeries and retro-obturation.

a- Put one measure of powder and one drop of distilled water upon a sterilized glass plate;b- Spatulate both for 30 seconds until the perfect homogeneity of the components. The cement got must have a sandy consistency, similar to amalgam, but more humid;c- Insert the spatulated cement in the place desired, using a sterilized amalgam-place or another professional instrument of your preference;d- Condensate the material inside the dental cavity.

d. MTA-Angelus preparing, application into the perforation and condensation of the material with condensing equipments or with sterile cotton balls; (Fig. 02)

3.2. RADICULAR PERFORATIONS TREATMENT BY INTERNAL RE-ABSORPTION (by means of canal)

*( TIP ) Important: A reinforcement on the canal walls are recommended if they happen to be too thin, utilizing composite resins for the canal filling;

5.2. Hydrogeneization Potential (pH)Its PH is highly alkaline (12,0) avoids the bacterial growth, keeping its anti bacterial potential for a long period.4. COMPOSITION: SiO2 ,K20, Al2O3, Na2O, Fe2O3, SO3, CaO, Bi2O3,MgO and unsolved residues (crystalline silica, calcium oxide and potassium sulfate and sodium).

5. IMPORTANT PROPERTIES5.1. Chemic-Physic PropertyIn contact with water it becomes a little colloidal gum which solidify itself, forming a rigid structure in an interval of 10 minutes.5.3. Radio-opacityThe MTA-Angelus radio-opacity is superior than the dentines and bone tissue, and near to the guta perchas, facilitating its visualization in operatory radiographic control and preservation.

5.4. HARDENING TIMEThe MTA-Angelus hardening time occurs in 10 minutes. 5.5. COMPRESSION RESISTANCEThe compression resistance after 28 days is of 44,2 MPa. Its resistance is under very acceptable values, considering that it wont have direct occlusal load in the applied areas.5.6. SOLUBILITYIt doesnt present significant signals of solubility in contact with humidity, guaranteeing a excellent marginal closing.

5.7. SEALING POWER AND BACTERIAL MICRO-INFILTRATIONThe MTA-Angelus sealing power was tested through in vitro technique for evaluation of the coloring infiltration quantity in the dentine interface - MTA-Angelus. The result was a little grade of coloring infiltration. So, we conclude that the material presents a high sealing power, getting difficult the bacterial infiltration, once the bacterias have bigger dimensions than the coloring molecules.

5.8. EXTRAVASATINGThe presence of material outside de operatory cavity during the procedures of radicular perforation obturation, overcoming the periodontal linking, will result into an inflammation and traumatic lesion, consequently, delaying in the scar process. 5.9. RESISTANCE TO THE MOVEMENTMTA-Angelus has a good adherence capacity in the dentine walls becoming, by this reason, resistant to dislocation forces. It may also be indicated to furcation perforations. In this case it must be covered with a intermedium restoration material, before the final restoration material.