Machined and plastic copings in three-element prostheses with different types of implantabutment joints: a strain gauge comparative analysis
OBJECTIVE: Using strain gauge (SG) analysis, the aim of this in vitro study was quantify the strain development during the fixation of three-unit screw implant-supported fixed partial dentures, varying the types of implant-abutment joints and the type of prosthetic coping. The hypotheses were that t...
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| Format: | Article |
| Language: | English |
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University of São Paulo
2010-06-01
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| Series: | Journal of Applied Oral Science |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-77572010000300005 |
| _version_ | 1818953021794549760 |
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| author | Renato Sussumu Nishioka Lea Nogueira Braulino de Melo Nishioka Celina Wanderley Abreu Luis Gustavo Oliveira de Vasconcellos Ivan Balducci |
| author_facet | Renato Sussumu Nishioka Lea Nogueira Braulino de Melo Nishioka Celina Wanderley Abreu Luis Gustavo Oliveira de Vasconcellos Ivan Balducci |
| author_sort | Renato Sussumu Nishioka |
| collection | DOAJ |
| description | OBJECTIVE: Using strain gauge (SG) analysis, the aim of this in vitro study was quantify the strain development during the fixation of three-unit screw implant-supported fixed partial dentures, varying the types of implant-abutment joints and the type of prosthetic coping. The hypotheses were that the type of hexagonal connection would generate different microstrains and the type of copings would produce similar microstrains after prosthetic screws had been tightened onto microunit abutments. MATERIALS AND METHODS: Three dental implants with external (EH) and internal (IH) hexagonal configurations were inserted into two polyurethane blocks. Microunit abutments were screwed onto their respective implant groups, applying a torque of 20 Ncm. Machined Co-Cr copings (M) and plastic prosthetic copings (P) were screwed onto the abutments, which received standard wax patterns. The wax patterns were cast in Co-Cr alloy (n=5), forming four groups: G1) EH/M; G2) EH/P; G3) IH/M and G4) IH/P. Four SGs were bonded onto the surface of the block tangentially to the implants, SG 1 mesially to implant 1, SG 2 and SG 3 mesially and distally to implant 2, respectively, and SG 4 distally to implant 3. The superstructure's occlusal screws were tightened onto microunit abutments with 10 Ncm torque using a manual torque driver. The magnitude of microstrain on each SG was recorded in units of microstrain (µε). The data were analyzed statistically by ANOVA and Tukey's test (p<0.05). RESULTS: Microstrain values of each group were: G1= 338.1±223.0 µε; G2= 363.9±190.9 µε; G3= 415.1±53.5 IE; G4= 363.9±190.9 µε. No statistically signifcant difference was found between EH and IH, regardless of the type of copings (p>0.05). The hypotheses were partially accepted. CONCLUSIONS: It was concluded that the type of hexagonal connection and coping presented similar mechanical behavior under tightening conditions. |
| first_indexed | 2024-12-20T09:59:39Z |
| format | Article |
| id | doaj.art-2a04931529464b08ad262573e318d9a4 |
| institution | Directory Open Access Journal |
| issn | 1678-7757 1678-7765 |
| language | English |
| last_indexed | 2024-12-20T09:59:39Z |
| publishDate | 2010-06-01 |
| publisher | University of São Paulo |
| record_format | Article |
| series | Journal of Applied Oral Science |
| spelling | doaj.art-2a04931529464b08ad262573e318d9a42022-12-21T19:44:22ZengUniversity of São PauloJournal of Applied Oral Science1678-77571678-77652010-06-0118322523010.1590/S1678-77572010000300005Machined and plastic copings in three-element prostheses with different types of implantabutment joints: a strain gauge comparative analysisRenato Sussumu NishiokaLea Nogueira Braulino de Melo NishiokaCelina Wanderley AbreuLuis Gustavo Oliveira de VasconcellosIvan BalducciOBJECTIVE: Using strain gauge (SG) analysis, the aim of this in vitro study was quantify the strain development during the fixation of three-unit screw implant-supported fixed partial dentures, varying the types of implant-abutment joints and the type of prosthetic coping. The hypotheses were that the type of hexagonal connection would generate different microstrains and the type of copings would produce similar microstrains after prosthetic screws had been tightened onto microunit abutments. MATERIALS AND METHODS: Three dental implants with external (EH) and internal (IH) hexagonal configurations were inserted into two polyurethane blocks. Microunit abutments were screwed onto their respective implant groups, applying a torque of 20 Ncm. Machined Co-Cr copings (M) and plastic prosthetic copings (P) were screwed onto the abutments, which received standard wax patterns. The wax patterns were cast in Co-Cr alloy (n=5), forming four groups: G1) EH/M; G2) EH/P; G3) IH/M and G4) IH/P. Four SGs were bonded onto the surface of the block tangentially to the implants, SG 1 mesially to implant 1, SG 2 and SG 3 mesially and distally to implant 2, respectively, and SG 4 distally to implant 3. The superstructure's occlusal screws were tightened onto microunit abutments with 10 Ncm torque using a manual torque driver. The magnitude of microstrain on each SG was recorded in units of microstrain (µε). The data were analyzed statistically by ANOVA and Tukey's test (p<0.05). RESULTS: Microstrain values of each group were: G1= 338.1±223.0 µε; G2= 363.9±190.9 µε; G3= 415.1±53.5 IE; G4= 363.9±190.9 µε. No statistically signifcant difference was found between EH and IH, regardless of the type of copings (p>0.05). The hypotheses were partially accepted. CONCLUSIONS: It was concluded that the type of hexagonal connection and coping presented similar mechanical behavior under tightening conditions.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-77572010000300005BiomechanicsDental implantsDental prosthesisImplant-supported dental prosthesis |
| spellingShingle | Renato Sussumu Nishioka Lea Nogueira Braulino de Melo Nishioka Celina Wanderley Abreu Luis Gustavo Oliveira de Vasconcellos Ivan Balducci Machined and plastic copings in three-element prostheses with different types of implantabutment joints: a strain gauge comparative analysis Journal of Applied Oral Science Biomechanics Dental implants Dental prosthesis Implant-supported dental prosthesis |
| title | Machined and plastic copings in three-element prostheses with different types of implantabutment joints: a strain gauge comparative analysis |
| title_full | Machined and plastic copings in three-element prostheses with different types of implantabutment joints: a strain gauge comparative analysis |
| title_fullStr | Machined and plastic copings in three-element prostheses with different types of implantabutment joints: a strain gauge comparative analysis |
| title_full_unstemmed | Machined and plastic copings in three-element prostheses with different types of implantabutment joints: a strain gauge comparative analysis |
| title_short | Machined and plastic copings in three-element prostheses with different types of implantabutment joints: a strain gauge comparative analysis |
| title_sort | machined and plastic copings in three element prostheses with different types of implantabutment joints a strain gauge comparative analysis |
| topic | Biomechanics Dental implants Dental prosthesis Implant-supported dental prosthesis |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-77572010000300005 |
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