Abstract
PurposeThe purpose of this study was to evaluate the behavior of mandibular canines acting as abutment teeth and indirect retainers of a Kennedy class II according to different designs: lingual rest and lingual rest associated with a reciprocal arm. Materials & methodsA resin cast with two simulated canine teeth was made in Ni-Cr alloy, representing a Kennedy class II mandibular arch. With the objective of simulating the resilience of the periodontal ligament, a polyurethane layer was added at the canine tooth's root. A metallic framework of Co-Cr alloy was fabricated with a T bar clasp and a lingual rest associated with a reciprocal arm. To obtain the second framework, the reciprocal arm was removed using a tungsten bur. Each framework was submitted to tensile force using a VersaTest machine. The magnitude and direction of canine movement during removal of the framework was measured using two dial gauges (mm). The axial tensile force required to remove the experimental framework (N) was also evaluated. The data were compared using the paired t-test with 95% confidence intervals. Differences were considered significant at P < .05. ResultsThe mean retentive force of the modified design framework with the reciprocal arm was significantly higher (P < .0001) than that of the framework with the lingual rest. The abutment teeth showed movement in the lingual and mesial directions, and this movement was less when associated with the reciprocal arm design. ConclusionThe reciprocal arm in association with a lingual rest in the framework decreased the movement of the abutment teeth when analyzed in the bucco-lingual and mesio-distal directions and contributed to increased retention by friction.
Highlights
Within the various treatment options available for replacing teeth in partially edentulous patients, treatment with a Removable Partial Denture Prosthesis (RPDP) is still used because it is an effective, conservative, and affordable option that provides adequate plaque control and requires frequent maintenance visits [1, 2, 3, 4, 5]
The purpose of this study was to evaluate the behavior of mandibular canines acting as abutment teeth and indirect retainers of a Kennedy class II according to different designs: lingual rest and lingual rest associated with a reciprocal arm
A metallic framework of Co-Cr alloy was fabricated with a T bar clasp and a lingual rest associated with a reciprocal arm
Summary
Within the various treatment options available for replacing teeth in partially edentulous patients, treatment with a Removable Partial Denture Prosthesis (RPDP) is still used because it is an effective, conservative, and affordable option that provides adequate plaque control and requires frequent maintenance visits [1, 2, 3, 4, 5]. Distal extension removable partial dentures have been implicated in increased mobility and destruction of the supporting tissues of abutment teeth [3, 9, 10]. Differences in resilience between periodontal abutment tissue and residual ridge mucosa are generally recognized as the main problem with this type of treatment [4, 7, 11, 12]. The amount of stress transferred to the abutment tooth depends on the rest location, clasp design, connector rigidity, direction and magnitude of the force, denture base extension, and angulation of the residual ridge [4, 9, 10, 13, 14, 15, 16, 17, 18]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
