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The Use of Both Porcelain Veneers and All-Porcelain Crowns in Restoring Anterior Teeth

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The Use of Both Porcelain Veneers and All-Porcelain Crowns in Restoring Anterior Teeth Clinical SHOWCAS E The Use of Both Porcelain Veneers and All-Porcelain Crowns in Restoring Anterior Teeth Omar El-Mowafy, BDS, PhD, FADM ver the past 2 decades, the use of than 0.5 mm), and the preparations must nonmetallic crowns for the restora- terminate in enamel. Preparations of an- tion of anterior teeth has gained terior teeth typically involve the facial “Clinical Showcase” is a O popularity. Unlike metal-and-ceramic surfaces with little or no involvement of series of pictorial essays that crowns, all-porcelain crowns are esthet- the lingual surfaces. In the following case, focus on the technical ically pleasing, with a lifelike appear- a combination of porcelain veneers and art of clinical dentistry. The ance. Some recently introduced porcelain all-porcelain crowns was used to restore section features step-by-step materials and new techniques for fabri- and improve the esthetics of maxillary case demonstrations of cation of such crowns can result in long- anterior teeth. clinical problems encountered lasting restorations that have a minimal in dental practice. risk of fracture when used for anterior �ase Report If you would like to propose teeth. The all-ceramic crowns used in a case or recommend a The maxillary anterior teeth of a 39- this case are copings with 99.9% densely clinician who could year-old woman had a less-than-ideal sintered aluminum oxide veneered with contribute to this section, appearance because of discoloration and dental porcelain.1 A 5-year clinical trial contact editor-in-chief recurrent carious lesions (Fig. 1). Intraoral Dr. John O’Keefe at involving 100 crown restorations of this and radiographic examination revealed [email protected]. type had a high success rate, and none that teeth 11, 12 and 13 had undergone of the crowns placed on anterior teeth endodontic treatment, which was the most underwent fracture.1 likely cause of the discoloration (Fig. 2). The porcelain veneer technique was Although the remaining maxillary teeth introduced to the profession more than 20 had not undergone endodontic treatment, years ago by Calamia.2 It is a conservative they had become shortened through ex- technique that can improve the esthetics cessive wear (Fig. 3). of anterior teeth. Veneer preparations re- Examination of the lingual surfaces quire minimal tooth reduction (no more of the teeth revealed that teeth 11, 12 and Figure 1: The patient’s maxillary Figure 2: Intraoral facial view of teeth 11, Figure 3: Tooth 21 appears too wide anterior teeth had incisal wear that 12 and 13 shows evidence of discoloration because of shortening that occurred with resulted in significant reduction in because of loss of vitality and recurrent excessive incisal wear. the cervico-insical length. Teeth 11, caries. There is also evidence of excessive 12 and 13 had undergone endo- incisal wear. dontic treatment and had become discoloured. ���JCDA • www.cda-adc.ca/jcda • November 2006, Vol. 72, No. 9 • 803 –––– Clinical Showcase –––– Figure 4: Lingual view of the maxillary Figure 5a: Maxillary diagnostic model. Figure 5b: A diagnostic wax-up was anterior teeth shows evidence of recurrent made to analyze and determine the caries and incisal wear on teeth 11, 12 and shape and size of the restorations. The 21 around existing composite restorations. wax-up was used for case presentation Teeth 22, 23 and 13 had new proximal to and discussion with the patient. caries and incisal wear. Figure 6: A model of the lower teeth was Figure 7: A silicon impression of the Figure 8: Following restoration of used to verify occlusion and ensure that the waxed-up model was made using a the proximal carious lesions in resin degree of overlap of the lengthened maxil- sectional disposable anterior tray. This composite, teeth 21, 22 and 23 lary teeth was within acceptable limits. impression was used for fabrication of the were prepared to receive porcelain provisional crowns and veneers. veneers. Preparation depth did not extend beyond the enamel to optimize bonding and retention. 21 had recurrent caries around existing composite fabrication of provisional crowns and veneers after restorations, whereas teeth 22, 23 and 13 had new preparation of the teeth. proximal caries (Fig. 4). Alginate impressions of Composite restorations were made according to the upper and lower arches were obtained, and standard technique for the carious lesions in teeth study models were poured in dental stone. The 21, 22, and 23. The teeth were then prepared to re- maxillary anterior teeth on 1 model were waxed ceive porcelain veneers (Fig. 8). Preparation depth was no more than 0.5 mm and was kept within the up to new anatomic form (Figs. 5a and 5b). A limits of the enamel for optimum bonding. Teeth model of the lower teeth was used during this 11, 12 and 13 received post-and-core restorations process to verify occlusion and to ensure that in- (Figs. 9 to 11). Nonmetallic posts (ParaPost Fiber cisal lengthening of the teeth was within accept- White, Coltene Whaledent, Langenau, Germany) able limits of the anterior overbite (Fig. 6). The were used in conjunction with a self-etching ad- waxed-up model was used for case presentation to hesive (Clearfil SE Bond, Kuraray Medical Inc., the patient. Using a sectional disposable anterior Okayama, Japan) and a dual-cured resin cement tray, a silicon impression was made of the waxed- (Panavia F 2.0, Kuraray Medical Inc.). Initial up maxillary model (Splash putty, Discus Dental, polymerization of the resin cement was started Culver City, Calif.) (Fig. 7). This was later used for when light-curing was applied. Core build-ups 804 JCDA • www.cda-adc.ca/jcda • November 2006, Vol. 72, No. 9 • –––– Clinical Showcase –––– Figure 9: Under rubber dam isolation, Figure 10: Rubber dam isolation was Figure 11: A core build-up was created teeth 11, 12 and 13 were first restored maintained, and the post on tooth 13 was using a composite resin (Z100). The teeth with nonmetallic posts (ParaPost Fiber cemented with dual-cure resin cement were then prepared to receive the all- White 1.25 mm). These posts were (Panavia F 2.0). porcelain crown restorations. supplied with colour-coded O-rings for easy sizing. In this photograph the 3 posts are being tried in after length adjustment. Figure 12: Teeth 11, 12 and 13 Figure 13: Facial view of all prepared teeth. Figure 14: An impression was made using after restoration with post-and-core There is clear evidence that the veneer silicon impression material (Splash). Note buildups and preparation for all- preparations are much more conservative the all-round shoulder finish line, necessary porcelain crown restorations. than the porcelain crown preparation. If the for all-porcelain crowns. restorations of teeth 21, 22 and 23 were to be made in all-porcelain crowns rather than veneers, they would be prepared in a manner similar to the procedure followed for teeth 11, 12 and 13, with much more tooth reduction. were then made using a hybrid composite (Z100, and a putty/wash technique (Splash half-time, 3M, St. Paul, Minn.) and the same bonding agent. Discus Dental) (Fig. 14). The teeth were then prepared to receive porcelain Provisional restorations were made using the crowns (Fig. 12) with an all-round shoulder finish silicon impression made of the waxed-up model line, which is necessary for proper support of the and an injectable provisional restorative material (PerfecTemp II, Discus Dental). These restaura- porcelain. tions were cemented with a temporary cement There was clear evidence in the facial view of (Fig. 15). all prepared teeth (Fig. 13) that the veneer prepar- A new shade guide (Vitapan 3D-Master, Vita ations required much less tooth reduction than the Zahnfabrik, Bad Sackingen, Germany) was used all-porcelain crown preparations. A final impres- to select an appropriate shade, and 3 Procera sion was taken with silicon impression material AllCeram crowns (Nobel Biocare AB, Gotenborg, ���JCDA • www.cda-adc.ca/jcda • November 2006, Vol. 72, No. 9 • 805 –––– Clinical Showcase –––– Figure 15: Facial view of the patient after Figure 16: Three Procera AllCeram (Nobel Figure 17: The fit of the restorations provisional restorations were inserted. Biocare AB) crowns were fabricated for was checked first on the cast. teeth 11, 12 and 13, and 3 IPS-Empress (Ivoclar) porcelain veneers were fabricated for teeth 21, 22 and 23. Figure 18: Intraoral view immediately Figure 19: Close-up of the 3 Procera Figure 20: Postoperative appearance after cementation of the restorations. A AllCeram crowns after cementation. There of the patient. There is good colour resin cement (Nexus 2) and a bonding is excellent colour-matching with the rest match between the veneer and crown agent (Prime and Bond NT) were used. The of the teeth and superior lifelike esthetics. restorations. selected shade of the resin cement was Initial marginal gingival inflammation in the adjusted to colour-match the veneers to the area of tooth 12 was expected to resolve crowns. within 2 weeks. Sweden) and 3 IPS-Empress porcelain veneers THE AUTHOR (Ivoclar, Schaan, Liechtenstien) were fabricated at a commercial dental laboratory (Fig. 16). The fit Dr. El-Mowafy is professor in restorative dentistry of the restorations was first checked on the model in the department of clinical sciences, faculty of (Fig. 17). At the next appointment, the restorations dentistry, University of Toronto, Toronto, Ontario. were tried in and cemented with a dual-cure resin Email: [email protected]. cement (Nexus 2, Kerr Corp, Orange, Calif.) and The author has no declared financial interests in any company a bonding agent (Prime and Bond NT, Dentsply, manufacturing the types of products mentioned in this article. Konstanz, Germany) (Fig. 18). The 3 crowns were first cemented with the selected shade of the resin References cement.
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