A MODIFIED TECHNIQUE FOR SINGLE STEP BORDER MOLDING.pptx

A MODIFIED TECHNIQUE FOR SINGLE STEP BORDER MOLDING.pptx

1. A MODIFIED TECHNIQUE FOR SINGLE STEP BORDER MOLDING Ravindra S.Pawar , Rahul S. Kulkarni, Pravin E Raipure Nov 2018 Vol 120, Issue 5, Pages 654-657

2. CONTENTS: INTRODUCTION MATERIALS USED TECHNIQUE ADVANTAGES DISADVANTAGES REVIEW OF LITERATURE ARTICLE CRITIQUE CONCLUSION REFERENCES

3. INTRODUCTION: Border molding is the process of shaping impression material along the borders of an impression tray by manipulating the soft tissues to duplicate the contour and size of vestibules. The sectional technique of border molding consists of tracing the borders of a custom tray by using impression compound modeling plastic in small sections, whereas the single-step technique consists of applying an elastomeric material on the entire border of the custom impression tray and manipulating the peripheral tissues until the material polymerizes.

4. Single-step border molding is usually carried out by using polysulfide, polyether, polyvinyl siloxane . Limitations of these materials include: - Odor and staining associated with polysulfides , Inadequate working time of polyether, Thick and over-extended borders obtained because of the putty-like viscosity of polyvinyl siloxane . - Moreover, adding material may not be possible to correct deficient areas.

5. Single-step border molding is more technique sensitive, as the entire vestibular sulcus and posterior palatal seal area need to be recorded accurately in a single insertion. Hence, the material used for this technique should provide optimum working time, and permit the correction of border molding by additions. A simplified technique for single-step border molding is presented here by using visible light-polymerizing tray material.

6. MATERIALS USED: Stock edentulous trays Irreversible hydrocolloid impression material ( NeocolloidType ; Zhermack ) II Gypsum ( Kalrock ; Kalabhai Karson) Visible light-polymerizing tray material( VocoIndivido ) Bonding agent (Triad VLC Bonding Agent; Dentsply Sirona ) Visible light-polymerization unit with a fiber optic tip ( Elipar Deepcure LED; 3M ESPE) Low-viscosity polyvinyl siloxane material ( Silagum ; DMG)

7. TECHNIQUE: 1. Make adequately extended maxillary and mandibular preliminary impressions by using stock edentulous trays and irreversible hydrocolloid impression material. 2. Mark the anterior and posterior vibrating lines on the soft palate by using indelible pencil and transfer the lines to maxillary impression to outline the posterior palatal seal area. 3. Pour primary casts in Type II gypsum and fabricate maxillary and mandibular secondary impression trays by using visible light-polymerizing tray material.

8. Adjust the borders of the custom impression trays 2 mm short of limiting structures on the casts, except in the posterior palatal seal and retromolar pad areas Verify the custom trays intraorally to eliminate over-extended or under-extended borders and confirm adequate relief for frenal attachments. Remove the tray from the oral cavity, wash it under running tap water, and dry it with compressed air. Apply a bonding agent on tray borders by using an applicator brush.

9. Prepare 3-mm-wide strips of border molding light-polymerizing tray material and adapt them to the borders of the maxillary custom tray. The soft and pliable nature of the material facilitates adaptation and shaping on the borders of the custom tray . Adapt the material to the posterior palatal seal area outlined by the anterior and posterior vibrating lines.

10. Place the custom tray on the maxillary edentulous ridge and carry out the single-step border molding procedure. Remove the tray from the mouth and inspect the tray borders. Add or remove material if necessary

11. Reinsert the custom tray intraorally on the denture foundation and polymerize the border molding material with a visible light-polymerization unit with a fiber optic tip for 3 minutes. The fiber optic tip facilitates access to the posterior palatal seal and other remote areas. After polymerization of the border molding material, verify the retention and adequate peripheral seal in the custom tray. If required, additional material may be adapted to the borders and polymerized.

12. Repeat the procedure for the mandibular arch. After completing the border molding , relieve 0.5 mm from the borders of the maxillary and mandibular border molded trays by using an acrylic bur in a straight handpiece . This will enable the light body polyvinyl siloxane to flow over the borders and record tissue details during the wash impression procedure

13. Make the maxillary and mandibular definitive impressions with low-viscosity polyvinyl siloxane material. Continuously mold the borders during the maxillary and mandibular wash impression procedure until the initial polymerization of the light body wash impression material.

14. ADVANTAGES: Offers extended working time. Advantageous for operators with less experience, such as dental school students. Correction of border molding is possible with the addition of new material. The technique uses materials that are readily available, and no special armamentarium is required.

15. DISADVANTAGES: The technique may not be indicated in the presence of severe tissue undercuts owing to the rigid nature of the material.

16. REVIEW OF LITERATURE: A comparative evaluation of three different techniques for single step border molding ; Kheur M, Jambhekar S, Sethi T, Kheur S Border molding using low fusing impression compound using heavy bodied elastomeric material - polyvinyl siloxane using modified zinc oxide eugenol impression paste

17. conclusion : Heavy Bodied Elastomeric Material- Polyvinyl siloxane has the best efficiency, while Low fusing Impression Compound Type I a had the least efficiency amongst the three when used for the purpose of border molding

18. Comparative evaluation of border molding using two different techniques in maxillary edentulous arches; Anchal Qanungo , Meena Ajay Aras, Vidya Chitre , Ivy Coutinho . Figure 1: ( a) Sectional border molding technique using low fusing b a Figure 2: ( a) Single - step border molding using injectable heavy b a Sectional border molding technique using low fusing impression compound

19. Conclusion: Sectional border molding technique proved to be more retentive as compared to single-step border molding although clinically the retention appeared comparable.

20. ARTICLE CRITIQUE: The study has not compared the retention of denture bases fabricated using this and other techniques of border molding The properties of materials used were not explained in details. The used of spacer is not included in the article The adhesion between trays and polyvinyl siloxane impression material is not mentioned.

21. CONCLUSION: One step border molding for the same technique is a viable and advantageous alternative to conventional border molding (sectional border molding) as it results in reduction of chair side time, less discomfort for the patient and less efforts for the dentist .

22. REFERENCES: Pawar . R, Kulkarni. R, Raipure . P; A modified technique for single-step border molding ; NOV2018, VOL 120 ISSUE 5 PAGES (J Prosthet Dent) Kheur M, Jambhekar S, Sethi T3, Kheur S; A comparative evaluation of three different techniques for single step border molding; Qanungo . A, Aras. M, Chitre . M, Coutinho I, et al ; Comparative evaluation of border molding using two different techniques in maxillary edentulous arches; The Journal of Indian Prosthodontic Society Oct-Dec 2016 | Vol 16 | Issue 4 Smith. D., Toolson , D, Bolender . C, Lord. L; One-step border molding of complete denture impressions using a polyether impression material; the iournal of prosthetic dentistry; MARCH 1979 VOLUME 41 NUMBER 3

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