The effect of various finish line preparations on the marginal seal and occlusal seat of full crown preparations

Abstract

The full veneer crown is one of the most important restorations in the armamentarium of the restorative dentist. The restoration can restore severely deteriorated teeth. One problem recognized by clinicians is that the cementing medium may prevent the seating of the full crown, positioning it in hyperocclusion and causing inadequately sealed margins. Investigators report the film thickness of cement along the axial walls of the preparation influences the seating of the restoration. The factors of cementation pressure, 1. Jorgensen K.D. Factors affecting the film thickness of zinc phosphate cements. Acta Odontol Scand. 1960; 18: 189 Google Scholar , 2. Jorgensen K.D. Structure of the film of zinc phosphate cements. Acta Odontol Scand. 1960; 18: 491 Crossref Scopus (42) Google Scholar , 3. Fusayama T. Ide K. Hosoda H. Relief of resistance of cement of full cast crowns. J Prosthet Dent. 1964; 14: 95 Abstract Full Text PDF Scopus (94) Google Scholar duration of cementation, 2. Jorgensen K.D. Structure of the film of zinc phosphate cements. Acta Odontol Scand. 1960; 18: 491 Crossref Scopus (42) Google Scholar , 3. Fusayama T. Ide K. Hosoda H. Relief of resistance of cement of full cast crowns. J Prosthet Dent. 1964; 14: 95 Abstract Full Text PDF Scopus (94) Google Scholar powder/liquid ratio of the cement, 2. Jorgensen K.D. Structure of the film of zinc phosphate cements. Acta Odontol Scand. 1960; 18: 491 Crossref Scopus (42) Google Scholar , 4. Kaufman E.G. Coelho D.H. Colin L. Factors influencing the retention of cemented gold castings. J Prosthet Dent. 1961; 11: 487 Abstract Full Text PDF Scopus (195) Google Scholar , 5. Kaufman E.G. Colin L. Schlagel E. Coelho D.H. Factors influencing the retention of cemented gold castings: The cementing medium. J Prosthet Dent. 1966; 16: 731 Abstract Full Text PDF Scopus (24) Google Scholar , 6. McCune R.J. The effect of occlusal venting and film thickness on the cementation of full cast crowns. Indiana University, School of Dentistry, Indianapolis (IN)1968 Google Scholar preparation dimensions, 1. Jorgensen K.D. Factors affecting the film thickness of zinc phosphate cements. Acta Odontol Scand. 1960; 18: 189 Google Scholar , 2. Jorgensen K.D. Structure of the film of zinc phosphate cements. Acta Odontol Scand. 1960; 18: 491 Crossref Scopus (42) Google Scholar , 4. Kaufman E.G. Coelho D.H. Colin L. Factors influencing the retention of cemented gold castings. J Prosthet Dent. 1961; 11: 487 Abstract Full Text PDF Scopus (195) Google Scholar type of cement, 6. McCune R.J. The effect of occlusal venting and film thickness on the cementation of full cast crowns. Indiana University, School of Dentistry, Indianapolis (IN)1968 Google Scholar , 7. Eames W.B. O'Neal S.J. Monteiro J. Miller C. Roan Jr., J.D. Cohen K.S. Techniques to improve the seating of castings. J Am Dent Assoc. 1978; 96: 432 PubMed Scopus (214) Google Scholar occlusal perforations, 1. Jorgensen K.D. Factors affecting the film thickness of zinc phosphate cements. Acta Odontol Scand. 1960; 18: 189 Google Scholar , 2. Jorgensen K.D. Structure of the film of zinc phosphate cements. Acta Odontol Scand. 1960; 18: 491 Crossref Scopus (42) Google Scholar die spacers, 7. Eames W.B. O'Neal S.J. Monteiro J. Miller C. Roan Jr., J.D. Cohen K.S. Techniques to improve the seating of castings. J Am Dent Assoc. 1978; 96: 432 PubMed Scopus (214) Google Scholar and relief of the internal crown surface 4. Kaufman E.G. Coelho D.H. Colin L. Factors influencing the retention of cemented gold castings. J Prosthet Dent. 1961; 11: 487 Abstract Full Text PDF Scopus (195) Google Scholar , 8. Bassett R.W. Solving the problems of cementing the full veneer cast gold crown. J Prosthet Dent. 1966; 16: 740 Abstract Full Text PDF Scopus (51) Google Scholar have been related to the film thickness. One study related the type of finish line of the preparation to the film thickness. Fusayama et al 3. Fusayama T. Ide K. Hosoda H. Relief of resistance of cement of full cast crowns. J Prosthet Dent. 1964; 14: 95 Abstract Full Text PDF Scopus (94) Google Scholar cemented cast full crowns onto extracted teeth prepared with the 90-degree shoulder, the 45-degree shoulder, and featheredge margins. They reported that the featheredge margin provided the best sealing effect followed by the 45-degree shoulder and 90-degree shoulder, respectively. In an earlier study, Fusayama et al 9. Fusayama T. Ide K. Kurosu A. Hosoda H. Cement thickness between cast restorations and preparation walls. J Prosthet Dent. 1963; 13: 354 Abstract Full Text PDF Scopus (47) Google Scholar found that, even without cement, crowns fail to seat completely owing to the numerous variables associated with the casting process.