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HOME > Restor Dent Endod > Volume 45(2); 2020 > Article
Case Report Chair-side CAD/CAM fabrication of a single-retainer resin bonded fixed dental prosthesis: a case report
Carlos Alberto Jurado1orcid, Akimasa Tsujimoto2orcid, Hidehiko Watanabe3orcid, Jose Villalobos-Tinoco4orcid, Jorge Luis Garaicoa3orcid, Mark David Markham5orcid, Wayne Walter Barkmeier5orcid, Mark Andrew Latta5orcid
Restor Dent Endod 2020;45(2):e15.
DOI: https://doi.org/10.5395/rde.2020.45.e15
Published online: February 6, 2020

1Clinical Digital Dentistry, A.T. Still University Arizona School of Dentistry & Oral Health, Mesa, AZ, USA.JFIFddDuckydqhttp://ns.adobe.com/xap/1.0/ Adobed     ! 1AQa"q 2#w8B36v7XRr$9bCt%u&Ws'(xy4T5fH  !1AQaq"2B Rbr#u67Ѳ3sTt5v8Sc$4ĂCÔ%UӅFV ?_Aנj- H>>,m*>fzp"TrKkr^r.|_&]|*vPuܶvoQ1mwVJUhu-I"=LniAƕ8"۲ k*ҿ[yu:.vUQ+)%F DHyVBk>Hy8jݹ q~9D4KRmzQ)^ʔ.J%k_tVi5NTjg!'ky|5asOȻ)R۸ߩFMԿ3L4j6dڜ#NIwUF]JqB/(FafJRzq3\G՛ ?~\ 6)6W4m[O^L0E&rRMض*C .]Unl-1 1r#Rj/&QɈ׉˩s6Rj=5Tg.y.·Pӡ:JJS:C8-2u]d&vUz;7p9 5VnL֢"y)">iי(IDDd| Yj0; LRfS:ktYK%*N2^m|&dğth":ey)uPQZW)gcC3Pv&MMWd&Ŵ۲mvTRoժM03*F3Yd6\8,\hݻ kߔi<k NTwSԪmljj[>->ptU%'LR>&EBH$MQAUx[$Z6vi&_a.KIQ{hyƒ j"JOC9eFҝfj;˚Ω<[3_m% lQ@4g=5$(J]Yc-OMq<Ǎ wSzڗ)k$7VIP붾ͯnV+卵*t]iЎD31~SA1éC2u)ʼnQn-Uoi3:grI8ؓWm*G zܕ)ZקJ}Y YlGeJ6cB2I NS3Q>k=KTBT]W6+SOXQgGR? telˊ%-Re\hѯ2TF"C/OJΩ6r[N.0{SpljjX1“jOsӥ;ҭhe}xu`Ք&.)yO̒ Fߑ.$Qw;9Iw2o+RVJMSOj[SoҌZ%;`d$blQ{Ro{Imڌ>3egf\O֝Uzx"䢸g+mv%Gʆ:|V[N'&ס-ޝ'kfE|K,G&˳98Juin/\\Qݿ̋v~Ǩ!rtWU d|E߫R4d}.qPw*Ӭv5YEcn~f5c%MTMkb-F>5JT,})QHg%{("ӔȸWMsYyWNRrkkJr0XドnͫT}r-jj,Ŕʍ\Q2Ri>v$5!]"JB2WɅ)]VԜUc8i|.jeRO6^V.¸ Q&#|ܶ-*uOG%JAtRZRr]FFG\۩w+?'zչSѧt jz>KW&ot{7P&2D;&\\>Q2JzܗAKSfeNn[jRrԕf6,q,F1tRfԗ>vֶևj-&R'Zi2=xv~Elbsvm8=ӛ"ū񕜈BȩlWau[]ٷBߨF~J!|Ipr3R̴#Yp)={7:G{+:\W}n|Q#%)7^-h"Ƒq:M*%J&$T軨I333׎g_- ucBwwjp[6i25$̏bU’ٱRv?G\~#Iͪb7<<}Ezt" q_Inw,7-d,G÷%T* Wg1"䥱kq/A.,_KhqŒxwvo u2ۥۧ.bQ}XκA$֣ +K״ZUNmڸII{.v{5z5ѮRme[moyƾd~cRݾK'j.\i&/S6f|b=5: p!6i_ 4j6=.si˧eƾtS^c.Y^RJVS-Vi3,esi08?H$GvZgg?gi䤟2adw릿:"۪lkSN>q-4kI܋ێe̊qۅgDoѨ9; #T.Q;7#~_Ufstb_'w~Xw1Xk,vcOt._}v}8"(4Z\ۘgk?J?bm_c!g{HZV]Fkk%~gEt)b秴vΰB|꽸}mp~E6ݹv;7P٤v+ri*3Ԣ|'O14_~7nP{7ZU\Vű[ +7󖱅o#:ǥŬ\|3r%TJX]V7ez¨Y]lc|O3V! 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3Department of Restorative Dentistry, Oregon Health and Science University School of Dentistry, Portland, OR, USA.

4Department of Oral Rehabilitation, Autonomous University of Queretaro School of Dentistry, Queretaro, Mexico.

5Department of General Dentistry, Creighton University School of Dentistry, Omaha, NE, USA.

Correspondence to Akimasa Tsujimoto, DDS, PhD. Assistant Professor, Department of Operative Dentistry, Nihon University School of Dentistry, 1-8-13, Kanda-Surugadai, Chiyoda-ku, Tokyo 101-8310, Japan. tsujimoto.akimasa@nihon-u.ac.jp
• Received: August 26, 2019   • Revised: November 2, 2019   • Accepted: November 22, 2019

Copyright © 2020. The Korean Academy of Conservative Dentistry

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (https://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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  • This clinical report describes designing and fabricating a single-retainer resin-bonded fixed dental prosthesis with a chair-side computer-aided design/computer-aided manufacturing system. The whole procedure, from tooth extraction to final placement of the prosthesis, was completed in one day, and a single clinic visit. No clinical complications were found at the 2-year follow-up after placement of the restoration, and satisfactory functional and esthetic results were achieved.
  • Keywords: Atraumatic restorative treatment; Dental prosthesis; Etching
Replacing a single missing tooth among the anterior teeth is challenging for the clinician, and many restorative options are currently available [1]. Although implant therapy is becoming the ideal option for patients who have an appropriate amount of alveolar bone [2], adhesive bridges offer less invasive clinical options than either implant therapy or conventional crown-retained prosthetics [3]. The history of adhesive bridges is believed to have started with the restorations developed by Rochette in 1973 [4]. Rochette designed a wing-shape gold alloy perforated abutment device to support and fix a prosthetic anterior mandibular tooth and bonded prosthesis to the lingual side of the abutment teeth using methyl methacrylate (MMA) resin. This allowed for a more conservative preparation of the abutment teeth than that required for cemented conventional crown-retained prosthetics. The clinical methodology evolved over the following years. In 1977, Howe and Denehy used nickel-chrome alloys for a fixed prosthesis, which are stronger than gold alloys, and replaced MMA with packable resin composites, for increased durability [5]. In the 1980s, Livaditis extended the technique to molars and used electrical etching rather than perforations to create the bonding surface [6,7]. This was combined with the use of flowable resin composites for the bonding procedure. From the early 1990s, high strength ceramic materials, including lithium disilicate and zirconia, began to replace metals as the material for the framework, and resin-bonded fixed dental prostheses (RBFDPs) approached their current form [8].
There are two options for the structure of RBDFPs: 1) single-retainer RBDFPs; and 2) 2-retainer RBDFPs. A recent systematic review of the literature of clinical studies of all ceramic RBFDPs showed that the estimated 5-year survival rate was 91.2%, and that single-retainer RBFDPs had a higher survival rate (p < 0.01), lower debonding rate, (p < 0.05), and lower fracture rate (p < 0.01) than two-retainer equivalents. Thus, single-retainer RBFDPs are currently the preferred treatment [9]. The most important advantages of single-retainer RBFDPs are the simplicity of the minimally invasive preparation design, reduced financial costs, and better clinical durability [10]. The application of RBFDPs has increased in recent years, but there are no clinical reports of the digital design and fabrication of such prostheses using chair-side computer-aided design/computer-aided manufacturing (CAD/CAM) systems.
The following clinical report describes the steps involved in designing and milling a single-retainer RBFDP for an edentulous site with a common chair-side CAD/CAM system in a single clinic visit.
A 55-year-old female patient presented to the clinic with a chief complaint of a fractured tooth and wanted treatment to restore the site. After the initial evaluation, it was diagnosed that tooth #6 was fractured at the level of the gingival tissue and was not restorable (Figure 1). The patient was informed of the treatment options available of a removable partial denture, a fixed prosthesis, or implant therapy, and the patient chose to have an implant after tooth extraction. The patient intended to have an aesthetic and durable temporary prothesis placed not only during the period when the extraction site was healing, but also cost savings for implant treatment. The patient was informed of the possibility of fabricating a single retainer cantilevered RBFDP as a long-term provisional restoration using a chair-side CAD/CAM system (CEREC, Dentsply Sirona, York, PA, USA), and accepted his treatment modality.
Figure 1

Patient presented with a non-restorable fractured tooth #6. (A) Preoperative facial view. (B) Preoperative occlusal view.

rde-45-e15-g001.jpg
First, impressions were made with polyvinyl siloxane material (Virtual, Ivoclar Vivadent, Schaan, Liechtenstein), and master cast models were fabricated with type IV stone (Fujirock, GC, Tokyo, Japan). Using the stone model, the minimal coronal portion of the fractured tooth was removed with a diamond bur and a slight concavity was creating. The master cast models were scanned, and the software indications for this type of restoration was as a fixed partial denture, with the edentulous site as a pontic and the retainer tooth as a veneer. Following conventional scanning protocols, the upper and lower casts were scanned, having selected the edentulous area as the pontic and the lingual part of tooth #7 as the veneer, as the software allows the clinician to select the position and dimension of the veneer on the lingual side. The software offers an ideal shape for both the veneer and pontic components of the restoration (Figure 2). The thickness of the restoration and occlusion were evaluated at this design stage, and the goal was to ensure at least 1 mm thickness for the veneer area and that the pontic unit was under occlusion. The final restoration had to fit within the CAD/CAM block, and due to its size, the sprue could only be placed on the interproximal side of the pontic (Figure 3). The final restoration was milled using lithium disilicate (e.max CAD, Ivoclar Vivadent) and placed in the master casts in order to evaluate occlusion and interproximal contacts (Figure 4).
Figure 2

Scanning the diagnostic casts and designing of the restoration. (A) Facial view of digitally designed restoration. (B) Occlusal view of digitally designed restoration.

rde-45-e15-g002.jpg
Figure 3

Digital design prior to milling.

rde-45-e15-g003.jpg
Figure 4

Final restoration try-in on the cast model. (A) Facial view of final restoration in cast. (B) Occlusal view of final restoration in cast.

rde-45-e15-g004.jpg
The patient was referred to the Periodontic Department for the extraction of non-restorable tooth #6 immediately after the impression and came back to the Restorative Department for bonding of the prepared single retainer cantilevered RBFDP to abutment tooth #7 after the extraction. A rubber dam (Dental Dam, Nic Tone, Bucharest, Romania) was placed from tooth #3 to tooth #13 and retained with clamps (Clamp #00, Hu-Friedy, Chicago, IL, USA) in order to achieve good isolation (Figure 5). The restoration was tried in prior to the bonding procedures. The adherend surface of the restoration was etched with 4.5% hydrofluoric acid (Ceramic Etching Gel, Ivoclar Vivadent) for 60 seconds, followed by rinsing and drying, then a pretreatment agent (Monobond Plus, Ivoclar Vivadent) was applied for 20 seconds. Surface treatment of the lingual side of tooth #7 was completed prior to the bonding of the restoration. The enamel surface was etched with 37% phosphoric acid (Total Etch, Ivoclar Vivadent) for 15 seconds and gently air-dried, followed by the application of a primer (Multilink Primer, Ivoclar Vivadent) and gentle removal of the excess with air. The white shade of resin cement (Multilink Automix, Ivoclar Vivadent) was applied, and then the single retainer cantilevered RBFDP was bonded, followed by removal of the excess of the cement. The definitive restoration was light-cured on the lingual retainer surface for 60 seconds. Floss was used for removal of the excess cement in the interproximal area, followed by an additional light cure (60 seconds) on the mesial surface of the lingual retainer (Figure 6). The rubber dam was carefully removed and all remaining excess cement was removed. The patient was pleased with the contours, shape, and shade of the long-term chair-side CAD/CAM RBFDP. The patient was recalled every 6 months, and no clinical problems or complications were found before or at the 2-year follow-up examination (Figure 7). Satisfactory functional and esthetic outcomes were achieved, and thus the patient decided not to proceed with implant therapy, rather retaining this restoration.
Figure 5

Occlusal view of isolation prior bonding.

rde-45-e15-g005.jpg
Figure 6

Occlusal view of bonded final restoration.

rde-45-e15-g006.jpg
Figure 7

Facial view of the single-retainer resin-bonded fixed dental prosthesis 2 years after cementation.

rde-45-e15-g007.jpg
The main goal of this treatment was to provide a fixed restorative solution for the edentulous site #6 that could meet the patient's esthetic demands and preserve the properly established mesiodistal space during tissue healing after root extraction and in preparation for future implant treatment without damage to proximal teeth. A secondary goal was to complete the treatment in a single day using a chair-side CAD/CAM system. The restoration was very conservative because the occlusion was evaluated intra- and extra-orally and it was possible to design, fabricate and deliver the restoration without tooth preparation. The maximum intercuspation position allowed enough lingual space for the single retainer on tooth #7. Tooth #5 had a porcelain fused to metal restoration that made the option of using it as a retainer challenging, and thus tooth #7 was used as the retainer. In addition, complete isolation with rubber dam provided a space between the prosthesis and the extracted site, which was bleeding. Because in this situation, the tooth was extracted, and the restoration was quickly fabricated and bonded without contamination of the bonding site.
Chair-side CAD/CAM RBDDPs can be scanned and designed directly intra-orally or on the master cast models, as in this case. Scanning and designing the restoration directly intra-orally can avoid any distortions due to cast fabrication, such as stone expansion, contamination made by impression materials and inaccuracies in the conventional impression. Extra-orally assessment of the lingual space for the single retainer and the adaptation of the prepared RBFDP to the abutment tooth could be conducted using the master cast models. In addition, the restoration was designed based on scanned data from the master cast models. In this case, to ensure that the preparations were all accomplished correctly, the restoration was fabricated from a laboratory scan of a model, but we anticipate future case reports in which the restoration is fabricated based on an intra-oral scan.
Conservative tooth preparation on the lingual side may help to seat the RBFDPs in the desired location properly. But since this type of restoration was intended for use as a provisional restoration during the healing of the tooth extraction site for future implant placement, we decided not to perform any tooth preparation to fix the restoration in this case. However, in this clinical case, the two-year follow-up demonstrated excellent stability of the RBFPD, and it was satisfactory for the patient.
A recent study using universal adhesive for bonding to unground enamel showed that there was no difference in bond strength to phosphoric acid etched unground and ground enamel [11]. In addition, hydrofluoric acid etching to lithium disilicate may improve resin cement bonding due to the creation of a microscale irregular structure on the surface [12]. Further, the rubber dam was able to isolate the lingual side of the retainer tooth in order to prevent any contamination from the extraction site, and thus the bonding properties both of the interfaces between enamel and adhesive, and resin cement and lithium disilicate were maximized. Because of these factors, a secure adhesion was obtained with a single retainer cantilever RBFDP fabricated by a chair-side CAD/CAM system resulting in a positive long-term prognosis. However, there is a lack of reported clinical trials comparing chair-side CAD/CAM manufactured one- and two-retainer RBFDPs, and further investigations are needed.
This chair-side RBFDP was fabricated out of a lithium disilicate block. The authors initially planned to use a resin composite blocks, but the software does not allow this because the software regards this restoration as two units. Currently, resin composite blocks are not permitted for the fabrication of two or more splinted units. If a future software update made it possible to treat a similar case using a resin composite block, costs would be reduced, and it would be possible to complete the entire procedure, from the extraction of the tooth to the placement of the temporary bridge, at chair-side and on a single day.
The use of a chair-side CAD/CAM system for fabrication of a single-retainer RBDFPs allowed completion of the procedure in one day, and a single clinic visit, resulting in a functional and esthetic result that was still satisfactory after 2 years.

Conflict of Interest: No potential conflict of interest relevant to this article was reported.

Author Contributions:

  • Conceptualization: Jurado CA, Tsujimoto A.

  • Data curation: Jurado CA, Villalobos-Tinoco J, Garaicoa JL.

  • Project administration: Watanabe H, Latta MA.

  • Software: Jurado CA.

  • Supervision: Tsujimoto A.

  • Writing - original draft: Jurado CA.

  • Writing - review & editing: Tsujimoto A, Markham MD, Barkmeier WW.

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      Chair-side CAD/CAM fabrication of a single-retainer resin bonded fixed dental prosthesis: a case report
      Restor Dent Endod. 2020;45(2):e15  Published online February 6, 2020
      DOI: https://doi.org/10.5395/rde.2020.45.e15
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    Chair-side CAD/CAM fabrication of a single-retainer resin bonded fixed dental prosthesis: a case report
    Image Image Image Image Image Image Image
    Figure 1 Patient presented with a non-restorable fractured tooth #6. (A) Preoperative facial view. (B) Preoperative occlusal view.
    Figure 2 Scanning the diagnostic casts and designing of the restoration. (A) Facial view of digitally designed restoration. (B) Occlusal view of digitally designed restoration.
    Figure 3 Digital design prior to milling.
    Figure 4 Final restoration try-in on the cast model. (A) Facial view of final restoration in cast. (B) Occlusal view of final restoration in cast.
    Figure 5 Occlusal view of isolation prior bonding.
    Figure 6 Occlusal view of bonded final restoration.
    Figure 7 Facial view of the single-retainer resin-bonded fixed dental prosthesis 2 years after cementation.

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    Chair-side CAD/CAM fabrication of a single-retainer resin bonded fixed dental prosthesis: a case report
    Restor Dent Endod : Restorative Dentistry & Endodontics
    © The Korean Academy of Conservative Dentistry.
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