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Biomedical subjects

M S Block

Publications and source records attributed to M S Block.

At least 55 records · Page 3Linked to original sources
PubMed1991

Subgingival bacteria associated with hydroxylapatite-coated dental implants: morphotypes and trypsin-like enzyme activity.

This study investigated the colonization of teeth and hydroxylapatite-coated dental implants by different groups of oral bacteria. Periodontal and gingival health were assessed and subgingival plaque samples were taken. Bacterial morphotypes in subgingival plaque samples were enumerated and expressed as percent of bacteria counted, and presence of trypsin-like enzymes was detected by hydrolysis of benzoyl-arginine naphthylamide (BANA). For both pooled and separate implant and teeth data, positive correlations were found between pocket depth and both BANA hydrolysis and percent spirochetes, and a negative correlation was found between pocket depth and percent cocci. With one exception, analysis of variance revealed no significant differences between implants and teeth for presence of bacterial morphotypes when considering both periodontal and gingival health.

Adult↗
PubMed1990

Adaptive remodeling of the rabbit temporomandibular joint following discectomy and dietary variations.

This study evaluates the healing of the rabbit temporomandibular joint (TMJ) following discectomy in four groups of animals fed a ground diet for 3 consecutive months (group 1), a ground diet for 1 month followed by 2 months of a coarse diet (group 2), a ground diet for 6 consecutive months (group 3), or a ground diet for 3 months followed by a coarse diet for 3 months (group 4), in order to evaluate the effects of changing the diet texture following discectomy. After 3 and 6 months, histologic evaluation demonstrated that 1) an early hyperplastic response in the fibrocartilage regressed in the later period regardless of diet, and 2) switching the ground diet to a hard diet caused degenerative scores to increase after both 1 and 3 months.

Analysis of Variance↗
PubMed1990

Factors associated with soft- and hard-tissue compromise of endosseous implants.

This prospective analysis identifies factors associated with endosseous implant removal as well as factors associated with implant morbidity resulting in nonscheduled patient visits. Treatment of the latter conditions is discussed. The most important factors identified for implant success were surgery without compromise in technique, placing implants into sound bone, avoiding thin bone or implant dehiscence at the time of implant placement, avoiding premature implant exposure during the healing period, establishing a balanced restoration, and insuring appropriate follow-up hygiene care. In the posterior mandible, the presence of keratinized gingiva was strongly correlated with optimal soft- and hard-tissue health.

Alveolar Process↗
PubMed1990

The effect of diameter and length of hydroxylapatite-coated dental implants on ultimate pullout force in dog alveolar bone.

This study compared the effect of diameter and length on the pullout force required to extract hydroxylapatite-coated implants from dog alveolar bone. After 15 weeks for integration, implants of 3.0, 3.3, and 4.0 mm diameter and 4, 8, and 15 mm length were pulled. The results showed that the ultimate pullout force correlated strongly to implant length, but not diameter. Cortical bone contributed more to implant retention than cancellous bone.

Alveolar Process↗
PubMed1990

Use of the integral implant for overdenture stabilization.

This paper describes the surgical and restorative use of the Integral endosseous implant for overdenture stabilization with different types of retentive attachments. The clinical experiences of 90 overdenture patients with follow-up to 56 months postrestoration are discussed. With proper patient work-up, failure and morbidity has remained low.

Alveolar Ridge Augmentation↗
PubMed1989

Loaded hydroxylapatite-coated and grit-blasted titanium implants in dogs.

This study evaluated the response of canine mandibular bone to loaded hydroxylapatite-coated (HAC) and grit-blasted titanium (GT) endosseous dental implants. Four dogs were partially edentulated in the maxilla and mandible. Two implants supporting freestanding prostheses were placed in each quadrant. Following 1 and 10 months of loading, the implants were evaluated. Soft-tissue pocket depths were not statistically different between the HAC and GT implants. Crestal bone loss was not significantly different between the two implants. However, the HAC implants had a statistically significant greater amount of bone apposed to their axial and apical surfaces compared to the GT implants.

Alloys↗
PubMed1989

Implant surgical template for partially edentulous patients.

A stable and dimensionally accurate surgical template provides a precise and stable reference for implant placement in the partially edentulous patient. Implant location and axis can be rigidly controlled with calibrated channels incorporated into the template.

Dental Implantation↗
PubMed1988

The effect of diet texture on healing following temporomandibular joint discectomy in rabbits.

This study evaluates the healing of the rabbit temporomandibular joint (TMJ) following discectomy in animals fed coarse or ground diets. Twenty New Zealand rabbits were divided into four groups with two unoperated groups serving as controls. A unilateral discectomy was performed and the animals were placed on either a regular (coarse) or a ground diet immediately following surgery. After 3 months, histologic evaluation demonstrated that fibrocartilage thickness was greatest in the discectomy-coarse diet operated joint, less in the discectomy-ground diet operated joint, still less in the discectomy-coarse diet unoperated joint, and unaffected in the control animals. The results of this study demonstrate that diet texture can affect TMJ healing following discectomy. The adverse responses of the coarse diet affected not only the operated joint but also the unoperated contralateral joint.

Animals↗
PubMed1988

Canine mandibular response to surfaced-textured hydroxylapatite blocks.

The response of bone to surface-textured dense hydroxylapatite (HA) was evaluated in interpositional and onlay grafts to the dog mandible. For surfaced-waffled HA blocks, bonding of bone to the HA stabilized the interpositional grafts within 4 weeks and the onlay grafts at 6 weeks. Bone conformed intimately to the textured HA surface. This study demonstrates the early bone response to surface-textured HA blocks in the dog.

Animals↗
PubMed1987

Mandibular augmentation in dogs with hydroxylapatite combined with demineralized bone.

This study investigates the tissue response in dogs to mandibular augmentation with hydroxylapatite (HA) combined with demineralized bone. Thirty mongrel dogs underwent ridge augmentation with 3 ml of HA alone (HAO), HA combined with autogenous bone (HAB), or HA combined with demineralized bone (HAD). Bone was not found in the HAO augmented ridges through 52 weeks; bone was found in the HAB augmented ridges by 12 weeks, and the HAD augmented ridges had bone formation after 26 weeks. This study demonstrates that demineralized bone can induce osteogenesis within the HA augmented dog ridge, but it is delayed when compared to HAB augmentations.

Alveolar Ridge Augmentation↗