Background: The golden standard for single unit crowns has for long been porcelain fused to metal (PFM). However, demands for improved esthetic materials has driven the development of zirconia which has increased in popularity due to its eminent mechanical and esthetic properties. Long term follow-up of zirconia is lacking and no consensus regarding which luting agent to use has yet been established. Aim: The aim of the present study was to evaluate the longevity of single unit crowns in relation to luting cements used and to investigate if any shift in the choice of crown materials could be seen over time. Methods: A retrospective journal survey with inclusion criteria being patients treated with tooth supported single crowns at the students’ clinic at the Umea University School of Dentistry. Extracted data were focused on 8 factors regarding information about the patient and materials used in the crown treatment. Statistical analyses were made with GraphPad.com and Microsoft Excel 2010. Results: Core reinforced zirconia crowns luted with RelyX showed a statistically significant higher success rate (95%) compared to crowns luted with zinc oxide phosphate (60%) (p<0.05). The most common complications were loss of retention and chipping of the veneering porcelain. Conclusion: The choice of luting agent seems to be of importance for core reinforced zirconia crowns. No statistically significant difference in success rate could be seen for PFM and monolithic zirconia. A shift in the choice of crown material could be seen. Monolithic ZR had increased, while PFM and ZR core had decreased.

Syftet med denna studie är att undersöka erfarenheter och åsikter hos allmäntandläkare samt specialisttandläkare runt om i Sverige genom en omfattande enkätstudie gällande användning av bettskenor i ett skyddande syfte av protetiska konstruktioner. 2771 tandläkarna hämtades ur en kunddatabas registrerade hos dental företaget Unident.Enkäten sammanställdes på Odontologiska fakulteten, Malmö högskola med 22 frågor. Enkäterna skickades ut i digital form i ett mejl genom Unident till tandläkarna. Antalet medverkande tandläkare blev 588.Studien visade att 67 % av tandläkarna ansåg att bettskenor i skyddande syfte vid protetiska konstruktioner ej var nödvändigt. Dock valde 4 av 5 tandläkare att ändå inkludera en skyddande bettskena till patienter med utförd protetik. Dagens litteratur är väldigt snäv i detta ämne och därmed finns ett behov för framtida studier utöver enkätstudier som påvisar evidens för potentiella bettskenor som agerar skyddande på protetiska konstruktioner hos patienter. / This study aimed to investigate the experiences and habits of dentists when prescribing an appliance as protection in prosthetic therapy in patients. Since there is no published scientific evidence showing that an appliance could be used as a protection in prosthetic therapy it was out of interest to know where dentists obtain their knowledge and if they consider themselves having an adequate competence in this field. The study is based on a survey that examines general dentists as well as dental specialists through a questionnaire with 22 questions out of mixed nature. The study covered 2771 dentists from different parts of Sweden, retrieved from a database of customer records handed by Unident, a dental company. A total of 588 dentists participated in the questionnaire. The use of appliances as protection in patients with prosthetic rehabilitation was considered no to be necessary among 67% of the dentists in this study. However, every 4 out of 5 dentists sometimes include an appliance as protection whenever prosthetic therapy is indicated. Today the literature is very sparse in this subject and there is an obvious need for future studies in a different design besides questionnaires, testing the evidence for a potential protective appliance in patients with prosthetic therapy.

Objective: The aim of this study is to describe additive manufacturing and evaluate how dentistry can take advantage of this technique today in general and for chair-side production of customized interim prostheses in particular. Method: Searches was made in the databases PubMed and ScienceDirect for information about additive manufacturing for dental applications. Searches was also made in the Rapid Prototyping Journal. Contacts was established with companies working with additive manufacturing for dental applications. The search engine Google was also used to find information about the additive manufacturing techniques in general and for dental applications. Results: Additive manufacturing is a rapidly expanding industry and can currently be used for several different applications in dentistry. It is today possible to use this technique, with materials approved for intraoral use, for chair-side fabrication of customized interim prostheses. Conclusion: Today it is possible to use additive manufacturing for chair-side production of interim prostheses. However, currently this production technique is still far too time consuming to be used effectively chair-side. With the current advancements in the area of additive manufacturing there is no doubt the technique can be utilized in the future and hopefully serve as a more reliable and safe way of producing interim prostheses. / Objective: The aim of this study is to describe additive manufacturing and evaluate how dentistry can take advantage of this technique today in general and for chair-side production of customized interim prostheses in particular. Method: Searches was made in the databases PubMed and ScienceDirect for information about additive manufacturing for dental applications. Searches was also made in the Rapid Prototyping Journal. Contacts was established with companies working with additive manufacturing for dental applications. The search engine Google was also used to find information about the additive manufacturing techniques in general and for dental applications. Results: Additive manufacturing is a rapidly expanding industry and can currently be used for several different applications in dentistry. It is today possible to use this technique, with materials approved for intraoral use, for chair-side fabrication of customized interim prostheses. Conclusion: Today it is possible to use additive manufacturing for chair-side production of interim prostheses. However, currently this production technique is still far too time consuming to be used effectively chair-side. With the current advancements in the area of additive manufacturing there is no doubt the technique can be utilized in the future and hopefully serve as a more reliable and safe way of producing interim prostheses.

OBJECTIVES: The objective was to investigate the accuracy, storage stability, and mechanical properties of 3D-printed polymeric dental materials. MATERIALS AND METHODS: Three completely dentate models, two maxillary and one mandibular each with their respective die, and three implant models were designed using dental CAD software (3SHAPE DENTAL SYSTEM). A horseshoe-shaped solid base with a posterior horizontal bar was utilized. The models were printed based on the manufacturer's instructions for four weeks using six printers with the corresponding recommended resin materials: Carbon M2 (DPR10), HeyGears A2D4K (Model HP UV2.0), Stratasys J5 (MED610), Stratasys Origin One (DM200), Envision One (E-Model LightDLP), and Asiga Pro4K (VeriModel) with a standard layer thickness of 50 μm (N=72). The models were scanned after printing using Sirona inEOS X5 scanner, while the implant models were scanned using a CT scanner (GE Phoenix V|tome|x metrology edition). The full arch models were randomly assigned to three groups of storage conditions: cold environment (LT, 4 ± 1°C), hot and dry environment (HT, 50 ± 2°C), and room temperature (RT , 25 ± 2°C, serving as the control). Each group was kept under the designated conditions and scanned at 1, 2, 3, 4, and 8 weeks. The generated STL files were imported into a 3D inspection software for comparison with the original STL files. Four sets of reference points (central fossa of first premolars and central fossae of second molars) were selected to determine six distances of inter-arch segments, from which the inter-arch distance trueness and precision deviation were measured. For the second part of the study, maxillary Lucitone Digital Print denture base (DB) (N=5), maxillary Lucitone IPN 3D Premium anterior and posterior teeth (N=6), and maxillary Keystone Keysplint Soft Clear occlusal splint (N=5) were printed using two printers (Carbon M2, Asiga Max UV) with a standard layer thickness of 50 μm for denture base and teeth, and 100 μm for the occlusal splint. The tolerance threshold was set to 50 μm for Lucitone IPN and 100 μm for Lucitone DB and Keysplint Soft. In-tolerance percentage and deviation RMS were obtained and analyzed with multivariate least square mean linear regression using JMP Pro 17 (SAS, Cary, NC) to identify significant effects (α=0.05). The third part investigated the mechanical properties of Lucitone DB and IPN using 2 printers (Carbon M2, Asiga Max UV) as follows: flexural strength (N=10) using a threepoint bend test, fracture toughness (N=10), creep (N=5), Vickers hardness test (N=15), surface roughness (N=15), while Shore A hardness (N=15) and tensile strength (N=10) were performed for Keysplint Soft Clear. Data were analyzed using one-way and multivariate least square mean linear regression followed by Tukey’s HSD test using JMP Pro 17 (SAS, Cary, NC) to identify significant effects (α=0.05). RESULTS: The in-tolerance percentage varied significantly among printers, with Carbon M2 (CAB) showing the highest values. Stratasys (J5) displayed the highest accuracy in term of precision, while HeyGears A2D4K (HGS), Carbon M2 (CAB), and Stratasys (J5) exhibited the highest accuracy in term of trueness. The inter-molar segment showed the highest deviation. No significant difference was observed in in-tolerance percentage across different print weeks except for week 2 in one printer (Stratasys Origin1). CAB exhibited a higher in-tolerance percentage for the DB than Asiga Max UV (ASG), with the fitting surface having the highest in-tolerance percentage. IPN anterior teeth had a higher intolerance percentage than posterior teeth, with ASG showing a higher value than CAB. No statistically significant difference was found in the in-tolerance percentage of Keysplint Soft Clear between ASG and CAB. Resin printed using ASG demonstrated higher flexural strength, Vickers hardness, and creep, while resin printer using CAB exhibited higher fracture toughness, with no significant difference in surface roughness between the two printers. Lucitone IPN had higher flexural strength and Vickers hardness, surface roughness , and lower creep and fracture toughness than Lucitone DB. CAB Keysplint Soft had higher tensile strength than ASG, with no statistically significant difference in Shore A hardness between the two printers. CONCLUSION: Model dimension deviations were impacted by storage conditions and the specific printer utilized, with high-temperature storage exhibiting the least stability. However, no significant difference was noted between low and room temperature storage conditions. Carbon M2 exhibited the highest level of accuracy. The of 3D-printed denture bases and denture teeth varied across different printers. Conversely, no significant difference in accuracy was observed for a soft occlusal splint between two printers. Materials printed using different printers showed statistically significant different mechanical properties.

AbstractAN IN-VITRO COMPARISON OF THE RETENTION OF PREFABRICATED PARALLEL-SIDED VENTED TITANIUM POSTS CEMENTED WITH THREE DIFFERENT DUAL-POLYMERIZABLE RESIN CEMENTSBy Maha M. El-Sayed, B.D.S., D.M.D.A Thesis submitted in partial fulfillment of the requirements for the degree of Master of Science at Virginia Commonwealth University.Virginia Commonwealth University, 2003Thesis Director: David R. Burns, D.M.D. Associate Professor and Program DirectorGraduate ProsthodonticsDepartment of ProsthodonticsPurpose: The purpose of this in-vitro study was to compare the retentive strength of an autopolymerizing resin cement to three dual-polymerizable resin cements when used to cement paraposts without light activation and to relate diametral tensile stress and hardness as a measure of the degree of polymerization to the retentive strength of the different dual-polymerizable resin cements. Material and methods: 60 human extracted premolar teeth were endodontically-treated and randomly divided into 4 test groups (n=15). Parapost XP posts (size 5) were cemented using Panavia 21(control), Panavia F, RelyX Unicem and Linkmax resin cements. The latter three cements were dual-polymerizable and were not light-activated, and the control cement was autopolymerizable. Also, 140 resin cement samples were fabricated for diametral tensile stress and Knoop hardness testing. Each test had 70 samples, 10 of each of the following groups: Panavia 21, Panavia F light-activated, Panavia F autopolymerized, RelyX Unicem light-activated, RelyX Unicem autopolymerized, Linkmax light-activated, Linkmax autopolymerized. Post retention, diametral tensile stress and surface hardness tests were performed 1 week after sample fabrication or post cementation.Results: ANOVA and Tukey-Kramer statistical analysis revealed significant differences among the test groups for the three tests. Conclusions: Within the limitations of this in vitro study, tested dual-polymerization resin cements had similar or superior parapost retention to the control autopolymerizing resin cement without photoactivation. Dual-polymerizable resin cements had improved diametral tensile stress and surface hardness when light-activated than when autopolymerized. No correlation was observed between surface hardness and diametral tensile stress or between the tested physical properties of the resin cements and their retentive qualities

An illuminative evaluation of the final year prosthodontic component of the Oral Health Science curriculum (OHSC 501 Component 1) at the University of the Witwatersrand, Johannesburg, South Africa was conducted. This evaluation method was employed to illustrate how an evaluation strategy was used to assess classroom practices following institutional curriculum reform. The aim was to use a qualitative evaluation process to assess the impact of the curriculum change at classroom level and to evaluate how a department had reformed its’ teaching and learning strategies within the hybrid problem based learning curriculum that had been implemented. Additionally, it was to evaluate how this curriculum operated in its own terms. From July through October 2007 small group teaching involving problem based learning, led by two faculty from the department of prosthodontics were observed. Six two hour long small group sessions (equivalent to twelve forty minute lessons), were observed and they revealed a variety of pedagogic strategies utilised. The plan, as outlined in the instructional system was held up against the reality through observations of what happened in the classroom. By and large the findings illustrate that much of what was planned was realised, with the more experienced staff member teaching more or less to the plan. However, from the themes that were inductively derived from analysis of the data, it was clear that integration of content knowledge and critical thinking necessary to assist in the comprehensive management of dental patients was not as robust as would be expected from the students at this level during their training. As part of the objectives of the curriculum innovation instituted, content knowledge integration and critical thinking skills are key to the success of the innovation and employing illuminative evaluation methodology afforded the opportunity to delve deeper into these. This finding illustrates the importance of using qualitative evaluation approaches as a mechanism to assess curriculum change efforts.

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Passivity fit of an implant fixed partial denture (FPD) is one of major factor in treatment success. Among various factors that influence the passive fit of a prostheses is the kind of retained. Thus, the aim of this study was to evaluate, with the aid of linear strain gages (gauges), the tension generated around two implants after installation of a three-unit implant FPD. Five groups were analyzed (n = 5): 1. Control (only the abutments on implants); 2. Cement-retained prosthesis; 3. Screw-retained prosthesis made from plastic cylinders; 4. Screw-retained prosthesis made from Co-Cr machined collar abutments; 5. Hybrid prosthesis (cemented / screwed). For the investigation, homogeneous polyurethane experimental model with two parallel external hexagon implants was used. From this model, transfer impression and one master stone cast was made on which all frameworks were made accompanying a wax pattern. Aiming to measure the tensions, four strain gauges for each implant placed in the mesial, distal, buccal and lingual were glued on the top surface of the experimental block. The tests were performed by installing the samples on the implants according to the characteristics of each group. Five repetitions of readings for each specimen were performed. One-way ANOVA and Tukey test were applied to the average values (p <.05). The mean and standard deviation were obtained: Group 1 (48.71 με ± 0.29), Group 2 (60.03 με ± 22.65) and group 3 (254.15 με ± 46.23), Group 4 (215,42 με ± 30.48), Group 5 (70.05 με ± 13.78). These results showed that the cement-retained prostheses have the ability to produce less stress on the peri-implant area when compared to the screw-retained prosthesis (p≤.05). It was observed that the hybrid group had similar performance to the cement-retained prostheses and the control group (p>.05). Furthermore, the screw-retained prosthesis made from plastic cylinders showed similar performance to the Co-Cr machined collar abutments (p>.05). Finally, these results demonstrated that the generated tension to the peri-implant tissues is directly related to the type of retention. / A passividade de assentamento de uma prótese parcial fixa sobre implantes é um fator primordial para o sucesso no tratamento. Dentre vários fatores que interferem na adaptação passiva de uma prótese está o tipo de retenção utilizado. Desta forma, o objetivo deste estudo foi avaliar, com o auxílio de extensômetros elétricos lineares (strain gauges), a tensão gerada ao redor de dois implantes após assentamento de uma prótese parcial fixa implantossuportada de 3 elementos. Cinco grupos foram analisados (n=5): 1. Controle (apenas os munhões sobre os implantes); 2. Prótese Cimentada; 3. Prótese Parafusada confeccionada com cilindros plásticos; 4. Prótese Parafusada confeccionada com cilindros com base de Co-Cr; 5. Prótese híbrida (cimentada/parafusada). Para a investigação, foi utilizado um modelo experimental homogêneo a base de poliuretano com dois implantes hexágono externo paralelos entre si. Visando medir as tensões, foram colados na superfície superior do bloco experimental quatro strain gauges para cada implante, posicionados nas faces mesial, distal, vestibular e lingual. Os testes foram executados instalando os corpos de prova sobre os implantes de acordo com as características de cada grupo. Realizou-se 5 repetições de leituras para cada corpo de prova. Análise de variância e teste de Tukey foram aplicados sobre os valores médios obtidos, utilizando um nível de significância de 0,05. A média e desvio-padrão obtidos foram: Grupo 1 (48,71 με ± 0,29); Grupo 2 (60,03 με ± 22,65); Grupo 3 (254,15 με ± 46,23), Grupo 4 (215,42 με ± 30,48), Grupo 5 (70,05 με ± 13,78). Esses resultados mostraram que as próteses cimentadas geraram menos tensão à região periimplantar quando comparadas às próteses parafusadas (p=0,0004/p=0,0008). Observou-se que o grupo híbrido teve desempenho semelhante às próteses cimentadas e ao grupo controle (p=0,9540/p=0,3402). Além disso, as próteses parafusadas confeccionadas com cilindros plásticos apresentaram desempenho semelhante às confeccionadas com cilindros com a base de Co-Cr (p=0,1580). Por fim, estes resultados demonstraram que a tensão gerada aos tecidos perimplantares está diretamente relacionada ao tipo de retenção.

Submitted by Renata Lopes (renatasil82@gmail.com) on 2017-06-26T12:34:48Z No. of bitstreams: 1 elissaalmeidarocha.pdf: 1048455 bytes, checksum: 482abe6dc9b27c43e6590f8c48ec4789 (MD5) / Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2017-08-07T20:35:48Z (GMT) No. of bitstreams: 1 elissaalmeidarocha.pdf: 1048455 bytes, checksum: 482abe6dc9b27c43e6590f8c48ec4789 (MD5) / Made available in DSpace on 2017-08-07T20:35:48Z (GMT). No. of bitstreams: 1 elissaalmeidarocha.pdf: 1048455 bytes, checksum: 482abe6dc9b27c43e6590f8c48ec4789 (MD5) Previous issue date: 2014-08-26 / CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / O objetivo deste estudo foi avaliar a influência de diferentes conexões no destorque do parafuso Neotorque sobre implantes com proporção coroa - implante (2:1), estudo in vitro, após ciclagem mecânica. Trinta implantes de 9 mm x 3,75 mm (Neodent®-Curitiba, Paraná, Brasil) foram utlizados, sendo 10 de cada tipo de conexão (CM,HE, HI) com seus respectivos munhões universais: (CM) ( 3,3/6/3,5), HE e HI ( 4,5,6,3) (Neodent®-Curitiba, Paraná, Brasil). Os implantes foram inseridos individualmente em resina acrílica (JET, Clássico, São Paulo, Brasil) com auxílio de um cilindro calcinável padronizado ( 2,5x1,5). O torque nos parafusos foi feito com torquímetro digital (Lutron TQ – 680, Impac, São Paulo), o grupo HE recebeu 30 N.cm, o grupo CM 15 N.cm e o grupo HI 20N.cm. Posteriormente a aplicação do torque, as coroas foram posicionadas sobre os pilares protéticos com vaselina sólida (Farmax, Divinópolis, Brasil) e em seguida foram submetidos à ciclagem mecânica (Simulador de Fadiga Mecânica, ERIOS, modelo ER – 11000), com aplicação de uma carga de 120N, 75 ciclos/s por 1.000.000 ciclos a 1 Hz, submersos em água destilada. Por fim, o destorque foi mensurado com o auxílio de um torquímetro digital (Lutron TQ-680, Impac, São Paulo/SP). Os valores de média de destorque (desvio padrão) obtidos após ciclagem mecânica foram: CM - 13,4 (1,83) N.cm, HI – 17 (1,69) N.cm e HE – 25,6 (1,95) N.cm. O teste de ANOVA (p<0,05) mostrou que não houve diferença estatisticamente significante entre os grupos (p=0,526) com relação aos diferentes tipos de conexão pilar - implante e a proporção coroa (2) – implante (1) após ciclagem mecânica. Para avaliar cada grupo independentemente em relação a perda de carga do torque de fechamento após ciclagem mecânica, foi realizada o teste t de student independente (p<0,05), obteve-se resultado estatisticamente significante para perda de torque inicial dentro de cada grupo: CM (0,022), HI (0,00) e HE (0,00). Concluiu-se que o tipo de conexão pilar - implante e da proporção coroa – implante (2:1) não influenciou na perda de torque após a ciclagem mecânica; a ciclagem mecânica influenciou na perda de torque dentro de cada grupo de conexão pilar – implante. / The aim of this study was to evaluate the influence of different connections in detorque Neotorque screw implant with crown ratio - implant (2:1), in vitro study, after mechanical cycling. Thirty of 9 mm x 3.75 mm (Neodent®-Curitiba, Paraná, Brazil) were utlizados implants, 10 of each connection type (CM, HE, HI) with their universal posts: (CM) ( 3, 3/6 / 3,5), HE and HI ( 4,5,6,3) (Neodent®-Curitiba, Paraná, Brazil). The implants were inserted individually in acrylic resin (JET, Classic, São Paulo, Brazil) using a standardized burn-cylinder ( 2,5x1,5). The torque on the bolts was done with digital torque meter (Lutron TQ - 680, Impac, São Paulo), the HE group received 30 N.cm, the CM group and 15 N.cm the HI group 20N.cm. Subsequently the application of torque, the crowns were placed on the abutments with petrolatum (Farmax, Divinópolis, Brazil) and then were subjected to mechanical cycling (Simulator Mechanical Stress, Erios, ER Model - 11000), with application of a 120N load, 75 cycles / sec per 1 million cycles at 1 Hz, immersed in distilled water. Finally, the detorque was measured with the aid of a digital torque meter (Lutron TQ-680, Impac, São Paulo / SP). The (standard deviation) values of average detorque obtained after mechanical cycling were: CM - 13.4 (1.83) N.cm, HI - 17 (1.69) and HE N.cm - 25.6 (1, 95) N.cm. The ANOVA test (p <0.05) showed no statistically significant difference between groups (p = 0.526) with respect to different types of abutment connection - implant and the crown ratio (2) - implant (1) after cycling mechanics. To evaluate whether each group compared to the pressure drop in torque after mechanical closure cycling, independent Student t (p <0.05) was performed, there was a statistically significant result for loss of initial torque in each group : CM (0.022), HI (0.00) and HE (0.00). It was concluded that the type of abutment connection - implant and crown ratio - implant (2: 1) no effect on the loss of torque after mechanical cycling; mechanical cycling effect on the loss of torque within each group of connection pillar - implant.

Introduction: Bien que l'importance de transférer les données de la recherche à la pratique a été largement démontrée, ce processus est toujours lent et fait face à plusieurs défis tels que la conceptualisation des évidences, la validité interne et externe de la recherche scientifique et les coûts élevés de la collecte de grandes quantités de données axées sur le patient. Les dossiers dentaires des patients contiennent des renseignements valables qui donneraient aux chercheurs cliniques une opportunité d'utiliser un large éventail d'informations quantitatives ou qualitatives. La standardisation du dossier clinique permettrait d’échanger et de réutiliser des données dans différents domaines de recherche. Objectifs: Le but de cette étude était de concevoir un dossier patient axé sur la recherche dans le domaine de la prosthodontie amovible à la clinique de premier cycle de l’Université de Montréal. Méthodes: Cette étude a utilisé des méthodes de recherche-action avec 4 étapes séquentielles : l'identification des problèmes, la collecte et l'interprétation des données, la planification et l’évaluation de l'action. Les participants de l'étude (n=14) incluaient des professeurs, des chercheurs cliniques et des instructeurs cliniques dans le domaine de la prosthodontie amovible. La collecte des données a été menée à l’aide d’une revue de littérature ciblée et complète sur les résultats en prosthodontie ainsi que par le biais de discussions de groupes et d’entrevues. Les données qualitatives ont été analysées en utilisant QDA Miner 3.2.3. Résultats: Les participants de l'étude ont soulevé plusieurs points absents au formulaire actuel de prosthodontie à la clinique de premier cycle. Ils ont partagé leurs idées pour la conception d'un nouveau dossier-patient basé sur 3 objectifs principaux: les objectifs cliniques, éducatifs et de recherche. Les principaux sujets d’intérêt en prosthodontie amovibles, les instruments appropriés ainsi que les paramètres cliniques ont été sélectionnés par le groupe de recherche. Ces résultats ont été intégrés dans un nouveau formulaire basé sur cette consultation. La pertinence du nouveau formulaire a été évaluée par le même groupe d'experts et les modifications requises ont été effectuées. Les participants de l'étude ont convenu que le cycle de recherche-action doit être poursuivi afin d'évaluer la faisabilité d’implémentation de ce dossier modifié dans un cadre universitaire. Conclusion: Cette étude est une première étape pour développer une base de données dans le domaine de la prothodontie amovible. La recherche-action est une méthode de recherche utile dans ce processus, et les éducateurs académiques sont bien placés pour mener ce type de recherche. / Introduction: Although the importance of research translating into practice has been widely recognized, this process is still slow and faces several barriers such as conceptualizations of evidence, internal and external validity of the evidence and high costs of providing large amounts of patient-based outcome data. Patient’s dental records contain valuable information that would give clinical researchers an opportunity to use a wide range of quantitative or qualitative information. Standardization of clinical record would allow the interoperability and reusability of data in different research fields. Objectives: The aim of this study was to design a research-based patient record in the field of removable prosthodontics in the undergraduate clinic of the “Université de Montréal.” Methods: This study used action research methods with 4 sequential steps: problem identification, gathering and interpreting data, action planning, and action evaluation. Study participants included professors, clinical researchers, and clinical instructors in the field of removable prosthodontics. Data collection consisted of a comprehensive literature review on prosthodontic outcomes as well as focus-group discussions and interviews. The qualitative data were analysed using QDA Miner 3.2.3. Results: The study participants raised several concerns about the deficiencies of the existing patients’ prosthodontic record in the undergraduate clinic. They shared their ideas for designing a new patient record based on 3 key objectives: clinical, educational, and research objectives. The prosthodontic outcomes of interest and appropriate instruments as well as the clinical parameters were selected by the research group and were integrated into a new research-based record. The appropriateness of the new record has been evaluated by the same panel of experts and the necessary modifications have been carried out. The study participants agreed that the action research cycle should be continued to evaluate the feasibility of the implementation of this redesigned record in the university-based setting. Conclusion: This study is a beginning effort to develop a database in the field of removable prosthodontics. Action research is a useful research method in this process, and academic educators are well placed to conduct such research.

O objetivo deste estudo foi avaliar clínica e radiograficamente implantes curtos com 5 e 6 mm de comprimento (Titamax WS Neodent/ Curitiba-Brasil) unitários instalados em região posterior de mandíbula e maxila com pouca altura óssea. Foram instalados 10 implantes em 8 pacientes devidamente selecionados a partir de critérios de inclusão pré-determinados. Os mesmos receberam carregamento protético somente após o tempo convencional de espera para a osseointegração. Seis implantes foram instalados em mandíbula e 4 implantes em maxila. Tomadas radiográficas foram realizadas para avaliação das perdas ósseas verticais e horizontais nos tempos T0 (Instalação cirúrgica), T1 (Reabertura), T2 (Instalação protética) e T3 (Acompanhamento de 6 meses). Foram avaliados parâmetros biológicos como, sangramento gengival, índice de mucosa ceratinizada, índice de placa e índice de inflamação gengival. Também foram avaliados parâmetros protéticos como proporção coroa-implante e distância mesiodistal. Apenas um implante (Titamax WS Cortical 5.0x6.0) foi perdido ainda no período de osseointegração portanto o índice de sucesso foi de 90% no período avaliado. A alteração do nível ósseo foi analisada em três períodos diferentes, da instalação cirúrgica à cirurgia de reabertura (período 1), da reabertura à instalação protética (Período 2) e da instalação protética ao controle de seis meses (Período 3). Avaliando-se a perda óssea vertical nos três períodos separadamente foram encontrados valores muito semelhantes, inclusive iguais estatisticamente (ANOVA, p<0,05). O valor de perda óssea no período 1 foi de 0,32mm; no período 2 foi de 0,22mm e no período 3 foi de 0,29mm. Isso significa que os procedimentos cirúrgicos foram igualmente causadores de perda óssea marginal mesmo tomando-se alguns cuidados na execução destas etapas. A média de perda óssea vertical e horizontal no período total de acompanhamento foi de 0,87 ±0,46 e 0,24± 0,34 respectivamente. Estes valores foram considerados dentro do intervalo de perda óssea esperado. A boa condição de saúde gengival e higiene oral descartaram a possibilidade de associação entre os índices periodontais e a perda óssea periimplantar. O teste estatístico de Regressão Linear (p<0,05) mostrou não haver relação de causa/efeito entre perda óssea e os parâmetros protéticos, apesar de elevada proporção coroa/implantes (média 1,88). Com base nos resultados encontrados neste trabalho, concluiu-se que os implantes curtos, mesmo os de comprimento 5 e 6mm, devem ser considerados como uma importante alternativa de tratamento para casos unitários. Sugere-se porém, um maior tempo clínico de acompanhamento para que seja possível traçar um perfil do comportamento destes implantes a longo prazo. / The aim of this study was to evaluate clinically and radiographically short unit implants with 5 and 6 mm in length (Titamax WS - Neodent / Curitiba, Brazil) installed in the posterior mandible and maxilla with little bone height. Ten implants were installed in eight carefully selected patients from inclusion criteria pre-determined. They received prosthetic loading only after the conventional time waiting for the osseointegration. Six implants were placed in the mandible and four implants in the maxilla. Radiographs were performed to evaluate the vertical and horizontal bone loss in T0 (surgery installation), T1 (uncovering), T2 (prosthetic installation) and T3 (follow-up of 6 months). Biological parameters were evaluated such as gingival bleeding index, keratinized mucosa amount, plaque index and gingival inflammation index. Prosthetic parameters were also evaluated as crown-implant ratio and mesiodistal distance. Only one implant (Titamax WS Cortical 5.0x6.0) was lost, it occurred during the healing fase. Therefore the success rate was 90% in the period. Bone level change was analyzed in three different periods, from surgical installation to uncovering surgery (1st period), from uncovering to prosthetic installation (2nd Period) and from prosthetic installation prosthetic to six months control (3rd Period ). Vertical bone loss values were very similar when evaluated in the three periods separately, even the same statistically (ANOVA, p <0.05). The amount of bone loss in 1st period was 0.32 mm in the 2nd period was 0.22 mm and in the 3rd period was 0.29 mm. This means that surgical procedures were also cause marginal bone loss even taking some care in implementing these steps. The average vertical and horizontal bone loss in the total period of observation was 0.87 ± 0.46 and 0.24 ± 0.34 respectively. These values were considered within the range of bone loss expected. The gingival good condition of health and oral hygiene ruled out the possibility of an association between periodontal indices and bone loss. Statistical analysis of linear regression (p <0.05) showed no cause and effect relationship between bone loss and prosthetic parameters, despite the high crown / implant ratio (average 1.88). Based on the findings of this study, it was concluded that short implants, even the 5 and 6 mm in length, should be considered as an important alternative treatment for single crows. It is suggested a longer clinical follow-up to make it possible to trace a pattern of behavior of these implants over the long term.