Prosthet Dent Research Articles

Prothetische Rehabilitation bei Patienten mit Kopf-Hals-Tumoren

Dholam KP et al. Impact of oral rehabilitation on patients with head and neck cancer: A study using the Liverpool Oral Rehabilitation Questionnaire and the Oral Health Impact Profile-14. J Prosthet Dent 2016; DOI: 10.1016/j.prosdent.2016.06.019

Drehmomentschlüssel im Test

Yilmaz B et al. Accuracy of mechanical torque-limiting devices for dental implants after clinical service. J Prosthet Dent 2015; 114: 378–382

A technique for minimizing subgingival residual cement by using rubber dam for cement-retained implant crowns

Excellent esthetics and a passive fit are facilitated by using cement-retained prostheses. However, eliminating residual cement is difficult in the subgingival area. Residual cement may cause periimplantitis, gingival swelling, pain, bleeding on probing, and other complications.1Pauletto N. Lahiffe B.J. Walton J.N. Complications associated with excess cement around crowns on osseointegrated implants: a clinical report.Int J Oral Maxillofac Implants. 1999; 14: 865-868PubMed Google Scholar Generally, the margin of an anterior implant crown is placed in the subgingival area for esthetic reasons. Because removing residual cement in subgingival areas is difficult, techniques using abutment replicas or Teflon tape have been introduced to minimize the problem.2Galván G. Kois J.C. Chaiyabutr Y. Kois D. Cemented implant restoration: a technique for minimizing adverse biologic consequences.J Prosthet Dent. 2015; 114: 482-485Abstract Full Text Full Text PDF PubMed Scopus (18) Google Scholar, 3Wadhwani C. Piñeyro A. Technique for controlling the cement for an implant crown.J Prosthet Dent. 2009; 102: 57-58Abstract Full Text Full Text PDF PubMed Scopus (82) Google Scholar, 4Hess T.A. A technique to eliminate subgingival cement adhesion to implant abutments by using polytetrafluoroethylene tape.J Prosthet Dent. 2014; 112: 365-368Abstract Full Text Full Text PDF PubMed Scopus (20) Google Scholar The presented technique uses rubber dam to allow only the minimal amount of residual cement to flow into the subgingival area when cement-retained prostheses with subgingival margins are delivered. The procedure does not require any additional laboratory steps. Moreover, it enables the isolation of a prosthesis before the cementation procedure. Since the cement does not flow into the subgingival area, less bleeding may occur when the residual cement is removed, thus causing less discomfort. Furthermore, rubber dam protects the gingiva from direct contact with the cement, thus decreasing chemical irritation. 1.Cut a sheet of rubber dam (Blossom; Mexpo Intl Inc) into a size approximating the mesiodistal width of the edentulous area and make a hole in the center with a dental explorer (EXDTU17/236; Hu-Friedy Mfg Co).2.Push the implant abutment (Myplant; RaphaBio Co) through the hole of the rubber dam and place it below the margin of the abutment (Fig. 1A ).3.Connect the customized abutment with rubber dam to the implant fixture and tighten to 30 Ncm. Adjust the occlusal contact of the restoration. After 10 minutes, retighten and seal the hole.5Siamos G. Winkler S. Boberick K.G. Relationship between implant preload and screw loosening on implant-supported prostheses.J Oral Implantol. 2002; 28: 67-73Crossref PubMed Scopus (169) Google Scholar Make sure not to cover the proximal contacts with the rubber dam (Fig. 1B).4.Apply a small amount of cement (RelyX Unicem; 3M ESPE) along the margin of the crown6Wadhwani C. Goodwin S. Cementing an implant crown: a novel measurement system using computational fluid dynamics approach.Clin Implant Dent Relat Res. 2014; 18: 97-106Crossref PubMed Scopus (13) Google Scholar and place the crown over the abutment. Light polymerize for an initial 1 or 2 seconds according to the manufacturer’s instructions (Fig. 2A ).Figure 2A, Place crown over abutment and light polymerize for 1 to 2 seconds. B, Remove residual cement.View Large Image Figure ViewerDownload Hi-res image Download (PPT)5.Remove the initially polymerized cement and carefully cut the rubber dam with scissors and remove it (Fig. 2B). After complete polymerization, ensure no cement remains.

WITHDRAWN: Comments regarding: Janyavula S, Lawson N, Cakir D, Beck P, Ramp LC, Burgess JO. The wear of polished and glazed zirconia against enamel. J Prosthet Dent 2013;109:22-9

This article has been withdrawn at the request of the author(s) and/or editor. The Publisher apologizes for any inconvenience this may cause. The full Elsevier Policy on Article Withdrawal can be found at http://www.elsevier.com/locate/withdrawalpolicy.

Stärkere Abrasionen im Gegenkiefer durch Zirkonoxid?

Mundhe K, Jain V, Pruthi G, Shah N. Clinical study to evaluate the wear of natural enamel antagonist to zirconia and metal ceramic crowns. J Prosthet Dent 2015; 114: 358–363

Although Cast Post and Cores Present Acceptable Survival, Patient-related Factors May Influence Survival

Survival of teeth treated with cast post and cores: A retrospective analysis over an observation period of up to 19.5 years. Raedel M, Fiedler C, Jacoby S, Boening KW. J Prosthet Dent 2015;114(1):40-5. Information not available Retrospective cohort study.

Combining digital photography with cylinder-type magnets to record the screw access hole in a cement-retained implant prosthesis

Combining digital photography with cylinder-type magnets to record the screw access hole in a cement-retained implant prosthesis

In vivo evaluation of the exposure to aluminium, cobalt, chromium, copper, nickel, titanium and vanadium in oral mucosa cells from orthodontic patients with mini-implants by Inductively coupled plasma-mass spectrometry (ICP–MS)

Statement of problem. The biocompatibility of titanium has been well documented, but clinical outcomes of ceramic-veneered titanium restorations were not conclusive. Purpose. The study presents the results of a 5-year clinical study of individual crowns and fixed partial dentures (FPDs) veneered with a low-fusing ceramic of the Procera system. Material and methods. All patients at one clinic who required crowns or FPDs during a 2-year period were invited to participate. A total of 260 patients received 333 ceramic-veneered Procera restorations (242 single crowns and 91 FPDs). Clinical registrations were performed annually, and the restorations were evaluated according to the California Dental Association rating system. At the 5-year follow-up, 198 (76%) patients were examined. Most of the loss of patients could be explained. Results. Practically all Procera restorations were judged as satisfactory both at baseline and follow-up examinations. One artificial crown and 1 FPD were remade because of extensive fractures of ceramic veneers. Two FPDs had fractures of a soldered joint, but only 1 FPD was replaced. Some minor complications occurred, such as small porcelain fractures that could be polished (6% of single crowns, 13% of FPDs) and or loosened restorations that were recemented. Other recorded complications were not related to the Procera system but to dental caries, loosened posts and cores, and root fractures. Conclusion. Clinical outcomes over a 5-year period for ceramic-veneered titanium restorations with the Procera system were favorable. (J Prosthet Dent 2000;84:514-21.)

Silikon-Korrekturabformung: Ausschneiden oder Applizieren von Abstandsfolien?

Mann K, Davids A, Range U et al. Experimental study on the use of spacer foils in two-step putty and wash impression procedures using silicone impression materials. J Prosthet Dent 2015; 113: 316–322

Vergleich von Retraktionssystemen mit und ohne Faden

Acar Ö, Erkut S, Özçelik TB, Ozdemır E, Akçil M. A clinical comparison of cordless and conventional displacement systems regarding clinical performance and impression quality. J Prosthet Dent 2014; 111: 388–394

Quick and effective custom tray for a feeding obturator

Clefts of the lip and palate are the most common congenital craniofacial malformations in children. 1 Osuji OO Preparation of feeding obturators for infants with cleft lip and palate. J Clin Pediatr Dent. 1995; 19: 211-214 PubMed Google Scholar Sucking is impaired in infants born with clefts due to lack of negative pressure. 2 Jones JE Henderson L Avery DR Use of a feeding obturator for infants with severe cleft lip and palate. Spec Care Dentist. 1982; 2: 116-120 Crossref PubMed Scopus (24) Google Scholar Excess air intake during feeding, requiring additional burping, chocking, and nasal regurgitation of food are other complications associated with clefts. 3 Savion I Huband ML A feeding obturator for a preterm baby with Pierre Robin sequence. J Prosthet Dent. 2005; 93: 197-200 Abstract Full Text Full Text PDF PubMed Scopus (12) Google Scholar A feeding obturator improves feeding and thereby contributing to weight gain and a thriving state of health, a prerequisite for surgical repair of the defects. 1 Osuji OO Preparation of feeding obturators for infants with cleft lip and palate. J Clin Pediatr Dent. 1995; 19: 211-214 PubMed Google Scholar The severity of the clefts varies so much that stock trays are not always adequate for making the impression, and a custom tray is required. This article describes a simple and effective technique for fabricating a custom tray for the infant patient.

A modified surgical template with dual function

aAdjunct Professor, Department of Dentistry, Federal University of Santa Catarina. bAdjunct Professor, Department of Dentistry, Federal University of Santa Catarina. cVisiting Professor, Department of Dentistry, Federal University of Santa Catarina. dChairman of Postgraduate Implant Dentistry, North Minas United College/FUNORTE. eProfessor and Head, Dental Materials Unit, Center for Dental and Oral Medicine, University of Zurich. (J Prosthet Dent 2013;110:232-233) This article describes a modified surgical template to guide the positioning of an implant immediately after tooth extraction and secure the immediate placement of an interim crown. The placement of dental implants immediately after tooth extraction is a popular treatment option, which has been reported to have high success rates.1-4 This technique enables clinicians to shorten treatment time and possibly provide an interim crown at the time of implant placement. In addition to shortening the surgical procedures, the immediate placement and provisional restoration of a dental implant is purported to better preserve the gingival and bone architecture, resulting in greater comfort and patient acceptance.2,4,5 However, successful immediate implant placement depends on satisfactory patient selection, treatment planning, and atraumatic tooth extraction. This enables adequate primary stability and correct implant location in a site that has preserved the natural architecture of soft and hard tissues. For this purpose, surgical guides have been used to ensure the correct 3-dimensional (3D) positioning of the implant.6,7 After immediate implant placement, an interim crown can provide patients with rewarding and rapid esthetic results. When an interim crown can be made by copying the emergence profile of a correctly located but hopeless tooth, it facilitates the maintenance of the postextraction gingival architecture, minimizing possible damage to hard and soft tissues after tooth extraction.8 However, it is important to ensure that the interim crown does not contact the opposing dentition in maximal intercuspation or during excursive mandibular movements.9,10 In this article, a surgical guide that can correctly guide implant placement as well as the correct placement of an interim crown is described.

Color stability of different composite resin materials

Data are needed to better predict the color stability of current composite resin materials. The purpose of this study was to evaluate the impact of different storage solutions on the color stability of different composite resin materials. Different restorative and adhesive composite resin specimens (dual-polymerizing self-adhesive resin cement, autopolymerizing resin-based composite resin, dual-polymerizing resin-based composite resin, nanohybrid composite resin, and microhybrid composite resin) were fabricated and stored in red wine, black tea, chlorhexidine, sodium fluoride, tea tree oil, or distilled water for 4 weeks at 37°C. Color parameters were measured with a colorimeter before and after storage. Total color differences and specific coordinate differences were expressed as ΔE, ΔL, Δa, and Δb. A 2-way and 1-way analysis of variance (ANOVA) with Bonferroni adjustment for multiple comparisons were applied for statistical calculations (α=.05). Red wine caused the most severe discoloration (ΔE >10), followed by black tea with perceptible (ΔE >2.6) to clinically unacceptable discoloration (ΔE >5.5). Colored mouth rinses discolored the materials to a lesser extent with clinically acceptable values. Dual-polymerizing resin adhesives showed a higher amount of discoloration. Current restorative and adhesive composite resin materials discolor over time under the influence of different storage solutions. The composition related to the polymerizing mode seemed to be a causative factor.

In vitro reproduction of incisal/occlusal cupping/cratering

Occlusal cupping/cratering (depressed dentin surrounded by elevated rims of enamel) has been postulated to be the result of abrasion, bruxism, attrition, acid erosion, stress corrosion, or a combination of these. The primary etiology or the multifactorial sequence of occlusal cupping/cratering remains scientifically unsubstantiated. The purpose of this study was to reproduce occlusal/incisal cupping/cratering in vitro. This study was designed to create cupping/cratering on the occlusal surfaces of extracted human teeth rather than to quantify the amount of lost tooth structure caused by abrasion. One name-brand toothbrush was tested with 2 different dentifrices (of different abrasive potentials [low and high]) and water only (nonabrasive) on extracted human teeth. Six specimens of 4 teeth each (24 teeth) were subjected to horizontal brushing in a 1:1 toothpaste/water slurry and water only. The control group, brushed with water only, demonstrated no visible loss of tooth structure. Each of the specimens brushed with toothpaste, regardless of the degree of abrasivity, demonstrated visible wear of the dentin, resulting in occlusal/incisal cupping/cratering. Pronounced cupping/cratering was caused by horizontal brushing with commercial toothpastes. Brushing in water demonstrated no visual loss of occlusal tooth structure. (J Prosthet Dent 2013;109:384-391).

Occlusal-view photograph of a cement-retained implant prosthesis as a permanent guide for access-hole preparation

Implant-supported fixed restorations can be screw-retained or cement-retained. Pjetursson et al 1 Pjetursson BE Brägger U Lang NP Zwahlen M Comparison of survival and complication rates of tooth-supported fixed dental prostheses (FDPs) and implant-supported FDPs and single crowns (SCs). Clin Oral Implants Res. 2007; 18: 97-113 Crossref PubMed Scopus (560) Google Scholar and Papaspyridakos et al 2 Papaspyridakos P Chen CJ Chuang SK Weber HP Gallucci GO A systematic review of biologic and technical complications with fixed implant rehabilitations for edentulous patients. Int J Oral Maxillofac Implants. 2012; 27: 102-110 PubMed Google Scholar observed that the most frequent technical complications with implant restorations were fracture or chipping of the veneer ceramic, abutment or screw loosening, screw fracture, and loss of retention. These complications necessitate the restorations to be removed, repaired, and reinserted as needed. For removal of cement-retained implant prostheses, it is necessary to access the abutment from the occlusal surface. Locating the site of entry for access-hole preparation to the abutment-screw has been described by several authors. 3 Doerr J Simplified technique for retrieving cemented implant restorations. J Prosthet Dent. 2002; 88: 352-353 Abstract Full Text Full Text PDF PubMed Scopus (41) Google Scholar , 4 Tarlow JL A modified technique to locate the abutment screw access opening of a cemented implant-supported restoration. J Prosthet Dent. 2012; 108: 58-59 Abstract Full Text Full Text PDF PubMed Scopus (17) Google Scholar , 5 Hill EE A simple, permanent index for abutment screw access for cemented implant-supported crowns. J Prosthet Dent. 2007; 97: 313-314 Abstract Full Text Full Text PDF PubMed Scopus (12) Google Scholar , 6 Schwedhelm ER Raigrodski AJ A technique for locating implant abutment screws of posterior cement-retained metal-ceramic restorations with ceramic occlusal surfaces. J Prosthet Dent. 2006; 95: 165-167 Abstract Full Text Full Text PDF PubMed Scopus (45) Google Scholar , 7 Figueras-Alvarez O Cedeño R Cano-Batalla J Cabratosa-Termes J A method for registering the abutment screw position of cement-retained implant restorations. J Prosthet Dent. 2010; 104: 60-62 Abstract Full Text Full Text PDF PubMed Scopus (26) Google Scholar Doerr 3 Doerr J Simplified technique for retrieving cemented implant restorations. J Prosthet Dent. 2002; 88: 352-353 Abstract Full Text Full Text PDF PubMed Scopus (41) Google Scholar and Tarlow 4 Tarlow JL A modified technique to locate the abutment screw access opening of a cemented implant-supported restoration. J Prosthet Dent. 2012; 108: 58-59 Abstract Full Text Full Text PDF PubMed Scopus (17) Google Scholar explained an access-gaining technique by using a vacuum-formed matrix with holes corresponding to abutment positions in which the clinician must preserve the original casts or a vacuum-formed matrix. Hill 5 Hill EE A simple, permanent index for abutment screw access for cemented implant-supported crowns. J Prosthet Dent. 2007; 97: 313-314 Abstract Full Text Full Text PDF PubMed Scopus (12) Google Scholar described preservation of a putty index for the same reason. Schwedhelm and Raigrodski 6 Schwedhelm ER Raigrodski AJ A technique for locating implant abutment screws of posterior cement-retained metal-ceramic restorations with ceramic occlusal surfaces. J Prosthet Dent. 2006; 95: 165-167 Abstract Full Text Full Text PDF PubMed Scopus (45) Google Scholar described a technique which requires placement of a small ceramic stain on the occlusal surface of the restoration during fabrication. Figueras-Alvarez et al 7 Figueras-Alvarez O Cedeño R Cano-Batalla J Cabratosa-Termes J A method for registering the abutment screw position of cement-retained implant restorations. J Prosthet Dent. 2010; 104: 60-62 Abstract Full Text Full Text PDF PubMed Scopus (26) Google Scholar advocated the preservation of a photograph in a computer file as part of the patient's permanent record; however, it involved using complex editing software to superpose 2 digital photographs of the definitive cast with and without the restoration.

Simple device for locating the abutment screw position of a cement-retained implant restoration

aAffiliate Faculty, Department of Restorative Dentistry, University of Washington; Private practice, Bellevue, Wash. bProfessor, Department of Restorative Dentistry, University of Washington. (J Prosthet Dent 2013;109:272-274) 1 Plate and guide rod engage abutment screw head on cast, with plate lowered and oriented to buccal of adjacent teeth. Cement-retained implant restorations have been reported to have several advantages over their screwretained counterparts, especially with respect to esthetics, occlusion, cost, passive fit, and reduced chair time.1,2 However, there are occasions when the cement-retained restoration requires removal, for example, if the abutment screws loosen or if the restoration needs repair.3,4 In this instance, the crown frequently remains cemented to the abutment. The abutment screw must then be accessed through the crown. The challenge here is to locate the screw position with minimal damage to the restoration, abutment, and possibly implant. Several authors have reported techniques to achieve this, which include reviewing a radiograph of the implant position and estimating the long axis position of the screw,5 using photography to record the position of the abutment before the crown is cemented,6,7 marking the screw access site with a porcelain stain during fabrication,8 or fabricating a vacuum-formed guide or template over the definitive restoration.9,10 The problems associated with these techniques are clear. Estimating the implant position in 2 dimensions either with radiographic or photographic records is inaccurate.5-7 Marking the screw access point may be useful in nonesthetic areas but has limitations with an anterior restoration.8 This article describes the procedure for fabricating a custom-made and precision implant-locating device (PILD) to record the access position of the abutment screw. It is simple, rapid, inexpensive, and gives 3-dimensional information for guiding directional screw access.

The Clinical Reliability of Zirconia-Based Fixed Dental Prostheses Appears Acceptable but Further Research Is Necessary

Article Title and Bibliographic Information Survival and complications of zirconia based fixed dental prostheses: a systematic review. Raigrodski AJ, Hillstead MB, Meng GK, Chung K-H. J Prosthet Dent 2012;107:170-7. Reviewer Eleni D. Roumanas, DDS Purpose/Question To determine the reported complications and survival rate of zirconia-based FDPs Source of Funding Partially supported by NIDCR R25 DE018436 Type of Study/Design Systematic review Level of Evidence Level 2: Limited-quality, patient-oriented evidence Strength of Recommendation Grade Grade B: Inconsistent or limited-quality patient-oriented evidence

A novel field barrier method for patients with an impaired glossopalatal seal

aLecturer, Section of Prosthetic Dentistry, School of Dentistry. bAssociate Professor, Section of Prosthetic Dentistry, School of Dentistry; Vice-Director, Department of Dentistry, National Taiwan University Hospital. (J Prosthet Dent 2013;109:206-207) The voluntary glossopalatal seal is formed when the soft palate and posterior tongue pinch together and can prevent premature spillage of fluid into the oropharynx during the preparation stage for swallowing.1,2 During routine dental procedures with water spray, patients control their glossopalatal seal to hold the water in the mouth until removed by an evacuator. However, patients whose glossopalatal seal is impaired by congenital or acquired soft palatal defects, tongue defects, or neurologic diseases affecting soft palate and tongue control often choke or cannot tolerate procedures even with the use of special high-volume evacuation. Although special evacuators such as the Svedopter (Svedia Dental-Industri AB, Enkoping, Sweden) or the Speejector (Pulpdent Corp, Watertown, Mass) are intended to retract the tongue, isolate the teeth, aid in fluid removal, and maintain a dry operation field, they cannot prevent water from reaching the back of the oral cavity and oropharynx. The application of a rubber dam or a throat pack as a barrier to the oropharynx has been suggested.3 However, a rubber dam is sometimes inapplicable or impedimental, and a throat pack does not work well during ultrasonic scaling or tooth preparation of the most distal or solitary abutment. For those situations, a technique to prevent water spilling into the oropharynx of patients with an impaired glossopalatal seal is presented. In this technique, the plastic sheet functions as a field barrier to prevent water spilling directly into the oropharynx. In procedures with profuse water irrigation, the passively seated plastic sheet in the oral cavity can act as a large reservoir to contain a large quantity of water before it is removed by the suction tube. The clinician can design and customize the rigid, frame-like plate according to the operation area and the location for finger rest.

A universal torque wrench system

aAssociate Professor, Department of Clinical Sciences, School of Dental Medicine, University of Nevada Las Vegas. bProfessor, Restorative and Prosthetic Dentistry, College of Dentistry, The Ohio State University, Columbus, Ohio. (J Prosthet Dent 2012;108:401-403) 1 Instrument kit with available inserts, from left to right: 0.050in. hexagon straight (Zimmer part # HX1.25D), 0.048-in. 24 mmL hex (Biomet 3i part # RASH3N), 0.048-in. 30 mmL (Biomet 3i part # RASH8N), 6-point star 20 mmL (Straumann part # 046.410), 6-point star 26mmL (Straumann part # 046.411), unigrip star 20 mmL (NobelBiocare part # 29151), unigrip star 25 mmL (NobelBiocare part # 29152), 4-lobe star 22 mL (Thommen part # 3.03.501), locator (Biomet 3i part # LOADT4), 0.035-in. hexagon 24 mmL (Biomet 3i part # RASH2N). Legend: ZI = Zimmer Dental, AST = AstraTech, 3i = Biomet 3i, STR = Straumann, NB = NobelBiocare, THM = Thommen, LOC = Locator. Dental implant manufacturers supply various forms of torque limiting devices for use with implant restorations. A clinician may use these instruments to ensure adequate torque delivery with appropriate precision.1-4 Throughout the early period of dental implant prosthetics, screw loosening was a major complication,4-8 but a later study found that while screw loosening remained a potential prosthetic complication, it was less common than the early studies suggested.9 Nevertheless, inadequate tightening with insufficient torque has been cited as a possible reason for screw loosening.10 Two major categories of torque limiting devices for use in implant dentistry are available: friction-style and spring-style. Friction-style devices are hexagon wrenches with a handle that releases when a desired torque value is reached. Spring-style devices have torque levels marked on an incremental scale, and the operator applies a force on the spring until the appropriate torque level is reached. Spring-style devices have been reported to be significantly more accurate than friction-style devices.11 Spring-style torque limiting devices have been adapted to multiple implant systems,12 which has simplified dental implant prosthetics. The technique, however, had limited torque control because of the lack of an incremental scale, allowing the operator to deliver torque values other than the preset 0, 15, and 35 Ncm. Since 1999 when this technique was published,12 substantial changes in implant systems have occurred and updates to the technique are indicated. The purpose of this article is to describe a universal implant torque kit that would allow an operator to provide precise torque values to implant components from various dental implant manufacturers. PROCEDURE

Pain and persistent occlusal awareness: What should dentists do?

Pain and persistent occlusal awareness: What should dentists do?