ABSTRACT
PURPOSE: This study measures the amount of torque that can be applied to the heads of implant screws via hand-held drivers and wrenches in a simulated clinical setting. MATERIALS AND METHODS: Sixty second-year dental students applied their maximum controlled torque to the head of a hex instrument attached to a Tonichi torque gauge mounted in a mannequin. The torque values obtained were recorded, and a mean torque value was calculated RESULTS; The mean torque value obtained in this study was 11.55 N.cm. CONCLUSIONS: Small-diameter, 10 N.cm gold screws can be adequately tightened with manufacturer-supplied instrumentation. Larger screws requiring more than 10 N.cm of torque cannot be tightened manually using currently available hand-held screwdrivers and hand wrenches.
Subject(s)
Dental Implants , Dental Instruments , Dental Prosthesis Retention/instrumentation , Dental Stress Analysis , Humans , Manikins , Materials Testing , Technology, Dental/instrumentationSubject(s)
Dental Soldering , Denture Repair , Denture, Partial, Fixed , Humans , Incisor , Prosthesis FailureABSTRACT
The placement of subgingival margins in ceramometal restorations has been discussed. A method of visualizing the attachment and managing the gingival tissues during tooth preparation has been presented.
Subject(s)
Crowns , Dental Impression Technique , Gingiva/anatomy & histology , Dental Alloys , Dental Impression Technique/adverse effects , Dental Porcelain , Esthetics, Dental , HumansABSTRACT
A method of removal of a post cemented to crown with the recovery of the undamaged crown has been presented. The fabrication of a replacement post-core assembly and the reuse of the original crown is described.
Subject(s)
Crowns , Denture Repair , Post and Core Technique , Acrylic Resins , Denture Design , Humans , Surface PropertiesABSTRACT
Three clasping systems were placed in five patients, and measurements of abutment tooth mobility were made. These data were compared to previously established baselines and statistically analyzed. The findings of the study are: 1. There was no difference in abutment tooth mobility during the 4-week test period with each of the three clasping systems. The important factor may have been the fit of the distal-extension denture base over the residual ridge, which provides the stability to prevent increases in abutment mobility. 2. Any mobility increases were in a buccal direction only, or toward the flexible retentive clasp arm. There was never any change in lingual mobility. 3. All five patients chose the I-bar retainer as the design of choice due to its increased resistance to dislodgment. Periodic recall of distal-extension removable partial denture patients is mandatory to ensure proper stress distribution and prevent increases in abutment tooth mobility.
