PubMed Health⌕ Search

Biomedical subjects

D W Boston

Publications and source records attributed to D W Boston.

17 recordsLinked to original sources
PubMed2001

Minimum lateral wall heights for conservative class I cavity preparations.

PURPOSE: To quantify the minimum necessary Class I cavity preparation lateral wall heights (LWH) for a cavity preparation 0.8 mm in width and extending to the dentin-enamel junction in a set of extracted human permanent posterior teeth. MATERIALS AND METHODS: 183 bucco-lingual or mesio-distal undecalcified sections were cut from a set of 73 posterior teeth. Macroscopic digital images were made of fissures within the sections and a computer-generated digital measuring device was superimposed to obtain LWH measurements corresponding to a cavity preparation 0.8 mm in width and extending to the dentin-enamel junction. Preparation LWH data was analyzed by tooth type and groups for mean, minimum, maximum, standard deviation, count, and frequency distribution. RESULTS: LWH varied between 1.2 mm and 2.5 mm for the 183 fissures tested. Mean LWH was 1.925 mm with a standard deviation of 0.262 mm. The most common LWH was 2.0 mm, found in 18% of the samples. Seventy percent of LWHs were 2.0 mm or less. Only two sections had LWHs of 1.2 mm, both in maxillary first premolars. Only two sections had LWHs of 2.5 mm, one in a mandibular second molar and the other in a maxillary first molar. Maximum LWH correlated positively (r = .469) with bucco-lingual crown width.

Bicuspid↗
PubMed2000

Use of an existing post to rerestore an endodontically treated tooth with a new post-and-core complex and crown: a case report.

Replacement of a post-and-core restoration that has failed because of caries or fracture presents a restorative challenge to the general dentist. This case report describes a new technique that enables the utilization of an unremovable preexisting post in the fabrication of a new post-and-core complex. This complex served as a foundation for a restoration that restored form and function to the patient's dentition.

Boron Compounds↗
PubMed1999

Abrasion, erosion, and abfraction combined with linear enamel hypoplasia: a case report.

Linear enamel hypoplasia is a developmental disturbance of enamel resulting in clinically visible horizontal defects in enamel that are present on eruption of the tooth. Nondevelopmental lesions of the hard tissues of the tooth, including carious, abrasion, erosion, attrition, and abfraction lesions, require varying amounts of time after tooth eruption to develop. Because linear enamel hypoplasia lesions are present on eruption and are exposed to the factors responsible for abrasion, erosion, and abfraction, nondevelopmental lesions could occur within them in any combination. This report describes a patient with multiple teeth with linear enamel hypoplasia lesions containing nondevelopmental defects as well as nondevelopmental defects that occurred separately. Severe pain and a unique lesion morphology were associated with the linear enamel hypoplasia defects. Affected teeth were extracted because of advanced periodontitis and were sectioned to determine the nature of the enamel and dentin lesions.

Aged↗
PubMed1997

Adhesive liner incorporation in dental amalgam restorations.

Previous studies have indicated that adhesive liners can affect the mechanical properties of set amalgam and, therefore, may become incorporated within the amalgam. The purpose of this in vitro study was to determine the distribution of two adhesive liners within standardized Class I amalgam restorations. Cavity preparations were restored with dental amalgam or with dental amalgam and either of two adhesive liners. Thin sections were cut from the restored teeth in various planes and examined radiographically and with a reflecting microscope. Radiographs were digitized and computer enhanced for improved observation. Amalgam restorations placed with adhesive liner had greater amounts of nonamalgam substance than did the nonadhesive liner restorations. Both Amalgambond Plus and Resinomer used with All-Bond II were capable of becoming incorporated within the body of a Class I restoration placed with a standard restorative amalgam bonding technique.

Composite Resins↗
PubMed1997

Cavosurface margin geometry in conventional and air abrasion Class V cavity preparations.

PURPOSE: To compare cavosurface angle and area of missing tooth structure at the cavosurface margin in cross-sections of Class V cavity preparations made with a conventional carbide bur and with an air abrasive cavity preparation system. MATERIALS AND METHODS: Class V cavity preparations were made with a #56 carbide bur or with a KCP 1000 air abrasive unit. They were restored and sectioned longitudinally, providing 43 margins for study. Cavo-surface angle and area of missing tooth structure were measured for each margin from digital images of the sections. The angle and area data was grouped according to margin location and cavity preparation system and analyzed for differences using the Kruskal-Wallis test. To determine if there was a relationship between the missing area and the angle at the cavosurface margin, Lomb periodograms were analyzed. RESULTS: Conventional cavity preparation margins had an average cavosurface angle less than 90 degrees while the air abrasion margin angle was greater than 90 degrees. Cavo-surface angles for conventional cavity preparations were significantly different from cavosurface angles for air abrasion cavity preparations. Missing areas at the cavosurface margin for conventional cavity preparations were not significantly different from missing areas at the cavosurface margin for air abrasion cavity preparations. Lomb periodograms showed no trend concerning the missing area as a function of the angle. CONCLUSIONS: There was no significant difference between the area of missing tooth structure at the cavosurface margin in conventional vs. air abrasion cavity preparation. Cavosurface angle in conventional preparations was less than 90 degrees, and greater than 90 degrees in air abrasion cavity preparations. Cavosurface angle and area of missing tooth structure at the cavosurface margin varied independently.

Air Pressure↗
PubMed1995

Caries diagnosis with dye-staining at amalgam restoration margins.

PURPOSE: To determine the strength of agreement between detection of caries at the margin of amalgam restorations with a caries detector dye, and detection of caries histologically utilizing light/polarizing light microscopy. MATERIALS AND METHODS: 17 permanent molars with intact amalgam restorations, determined to be caries-free by visual inspection and explorer probing, cleansed with an air/water/abrasive slurry system, and with evidence of amalgam enamel marginal staining from application of a 1% solution of sulforhodamine B caries detector dye were utilized. Longitudinal, undecalcified sections, 80-100 micrometers thick, were prepared including stained and unstained regions of the amalgam/enamel margin of each tooth, providing 34 margins for study. The sections were examined in the light/polarizing light microscope for evidence of marginal caries. The Kappa Index was calculated to determine the strength of agreement between the caries dye method and the light/polarizing light microscopic method of caries diagnosis. RESULTS: Microscopically, caries was detected in 14 of 34 margins (41%). Agreement for presence of caries was 5 of 34, and for absence of caries 8 of 34 (total agreement 38%). 12 of 17 dye-stained margins were microscopically caries-free, and 9 of 17 unstained margins had caries microscopically. Kappa Index for these findings was 0.23, indicating poor strength of agreement.

Coloring Agents↗
PubMed1993

An improved technique for Class V composite resin inlays.

Treatment of cervical carious lesions presents significant problems to the restorative dentist, including difficulties with access and with the restorative materials themselves. Conventional approaches are not suitable for inaccessible or multisurface cervical lesions. Polymerization shrinkage associated with composite resins is also a problem. Although indirect composite resin inlay techniques address these shortcomings, they generally require two patient visits. An improved technique solves these problems by utilizing a copper band impression technique, a quick-setting stone die, extraoral curing of the composite resin inlay, and dentinal adhesive bonding technology in a one-visit restorative approach to the cervical carious lesion.

Composite Resins↗
PubMed1989

Histological study of an acid red caries-disclosing dye.

When 20 extracted teeth were examined histologically after using a 1.0% acid red caries-disclosing dye before excavation of carious dentin, 25% showed the presence of bacteria in the dentin. The use of a solution of 1.0% acid red in propylene glycol to identify infected dentin will greatly decrease but not completely eliminate the changes of viable bacteria remaining in a cavity preparation.

Coloring Agents↗
PubMed1978

A simple portable voiced, unvoiced and "s" indicator.

This unit is called a V.S.F. indicator, the initials V.S.F. denoting Voiced "s" and Fricative indicator. It has been developed by the R.N.I.D. as an economical and portable speech training aid. A microphone is plugged into the device which classifies speech sounds on 3 lamps arranged vertically. The upper red lamp denotes voiced sounds. An amber light, centre, deonotes fricative sounds except "s" sounds which are indicated on the lower greeen lamp. The operation of the green light depends on the low frequency energy, while the amber and green lights are controlled by the rate of zero crossings. Informal trials in a variety of different types of special clinics have indicated that the most useful areas seem to be with profoundly deaf children and adults, although speech therapists have also reported promising reactions from children with a variety of communication disorders.

Humans↗
PubMedDate not supplied

Clinical productivity indicators for a dental general practice residency program.

Management of clinical productivity is an essential activity in the dental general practice residency GPR program. Because productivity is a relative term, indicators of clinical productivity must be developed to evaluate current performance. This article presents a 3-year study of clinical productivity in a two-resident GPR program. Productivity indicators are developed and analyzed for this program and for application to other GPR programs.

Dental Service, Hospital↗
PubMedDate not supplied

An accurate chairside technique for fabricating a temporary restoration for ITI single-tooth implant.

Current implant restoration techniques depend upon a well-fitting, anatomic provisional restoration--especially at the restoration margin--to promote healthy soft tissue contours, which are necessary for successful final restorations. The ITI implant system presents a particular challenge in this regard because of the configuration of the implant head and shoulder, especially when these are placed subgingivally. A chairside method for obtaining an accurate marginal fit and customized contours in the single-tooth provisional restoration is described and illustrated.

Dental Implants, Single-Tooth↗
PubMedDate not supplied

Histobacteriological analysis of acid red dye-stainable dentin found beneath intact amalgam restorations.

This study determined histologically the incidence of acid red dye-stainable dentin and its correlation to bacterial presence beneath intact clinically sound amalgam restorations. Fourteen of 16 clinically sound amalgam restorations (88%), serving an average of 11 years, had microscopically evident microorganisms in the subjacent dentin. Eleven of the 14 specimens containing bacteria (79%) exhibited acid red dye-stainable dentin. There was no obvious correlation between dye-stainable dentin and the presence of bacteria on the walls of the cavity preparations studied. The question of how much dye-stainable dentin can be present beneath an amalgam restoration before the restoration fails is still unanswered.

Adult↗